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802.2203
Mikhail Sheftel
Y. Nutku, M. B. Sheftel, J. Kalayci and D. Yazici
Self-dual gravity is completely integrable
LaTeX2e source file, 18 pages. Title has been changed and two more authors are added: Y. Nutku and J. Kalayci. A new, simpler version of the Lagrangian is used in sections 2 and 3. Cosmetic changes are made in Introduction, section 6 and Conclusion
null
10.1088/1751-8113/41/39/395206
null
math-ph gr-qc hep-th math.MP nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discover multi-Hamiltonian structure of complex Monge-Ampere equation (CMA) set in a real first-order two-component form. Therefore, by Magri's theorem this is a completely integrable system in four real dimensions. We start with Lagrangian and Hamiltonian densities and obtain a symplectic form and the Hamiltonian operator that determines the Dirac bracket. We have calculated all point symmetries of two-component CMA system and Hamiltonians of the symmetry flows. We have found two new real recursion operators for symmetries which commute with the operator of a symmetry condition on solutions of the CMA system. These operators form two Lax pairs for the two-component system. The recursion operators, being applied to the first Hamiltonian operator, generate infinitely many real Hamiltonian structures. We show how to construct an infinite hierarchy of higher commuting flows together with the corresponding infinite chain of their Hamiltonians.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 13:39:00 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 14:59:40 GMT" }, { "version": "v3", "created": "Sun, 24 Feb 2008 09:56:46 GMT" }, { "version": "v4", "created": "Thu, 27 Mar 2008 10:54:47 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Nutku", "Y.", "" ], [ "Sheftel", "M. B.", "" ], [ "Kalayci", "J.", "" ], [ "Yazici", "D.", "" ] ]
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802.2204
Shigetoshi Yazaki
Michal Benes, Masato Kimura and Shigetoshi Yazaki
Analytical and numerical aspects on motion of polygonal curves with constant area speed
Proceedings of Slovak-Austrian Mathematical Congress, within MAGIA 2007, Dept. of Mathematics and Descriptive Geometry, Faculty of Civil Engineering, Slovak University of Technology, ISBN 978-80-227-2796-9 (2007) 127--141
null
null
null
math.NA math.DG
null
General area-preserving motion of polygonal curves is formulated as a system of ODEs. Solution polygonal curves belong to a prescribed polygonal class, which is similar to the admissible class used in the crystalline curvature flow. The ODEs are discretized implicitly in time keeping a given constant area speed while solution polygonal curves keep belonging to the polygonal class.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:24:40 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 09:25:09 GMT" }, { "version": "v3", "created": "Tue, 13 May 2008 04:05:16 GMT" } ]
"2008-05-13T00:00:00"
[ [ "Benes", "Michal", "" ], [ "Kimura", "Masato", "" ], [ "Yazaki", "Shigetoshi", "" ] ]
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802.2205
Sergei Sergeenkov
S. Sergeenkov, A.J.C. Lanfredi, F.M. Araujo-Moreira
Magnetic and transport properties of electron-doped superconducting thin films: Pairing symmetry, pinning and spin fluctuations
To appear as a book Chapter in "Superconducting Thin Films: New Research" (ed. Arnold H. Burness, Nova Science, New York, 2008)
null
null
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this Chapter we review our latest results on magnetic (AC susceptibility) and transport (resistivity) properties of Pr1.85Ce0.15CuO4 (PCCO) and Sm1.85Ce0.15CuO4 (SCCO) thin films grown by pulsed laser deposition technique. Three main topics of our studies will be covered. We start with a thorough discussion of the pairing symmetry mechanisms in optimally-doped SCCO thin films based on the extracted with high accuracy temperature profiles of penetration depth. In particular, we found that above and below a crossover temperature T*=0.22T_C, our films are best-fitted by a linear and quadratic dependencies, respectively, with physically reasonable values of d-wave node gap parameter and paramagnetic impurity scattering rate. Our next topic is related to the flux distribution in our films. More precisely, we present a comparative study on their pinning ability at low magnetic fields extracted from their AC susceptibilities. Depending on the level of homogeneity of our films, two different types of the irreversibility line have been found. The obtained results are described via the critical-state model taking into account the low-field grain-boundary pinning. And finally, we demonstrate our recent results on the normal state temperature behavior of resistivity R(T) for the high-quality optimally-doped SCCO thin films. In addition to the expected contributions from the electron-phonon and electron-electron scattering processes, we also observed an unusual step-like behavior of R(T) around T=87K which we attributed the to the manifestation of thermal excitations due to spin fluctuations induced by Sm3+ moments through Cu2+-Sm3+ interaction.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:03:33 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Sergeenkov", "S.", "" ], [ "Lanfredi", "A. J. C.", "" ], [ "Araujo-Moreira", "F. M.", "" ] ]
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802.2206
Paul Goldsmith
Paul F. Goldsmith, Mark Heyer, Gopal Narayanan, Ronald Snell, Di Li, and Chris Brunt
Large-Scale Structure of the Molecular Gas in Taurus Revealed by High Linear Dynamic Range Spectral Line Mapping
53 pages, 21 figures
Astrophys.J.680:428-445,2008
10.1086/587166
null
astro-ph
http://creativecommons.org/licenses/publicdomain/
We report the results of a 100 square degree survey of the Taurus Molecular Cloud region in the J = 1-0 transition of 12CO and 13CO. The image of the cloud in each velocity channel includes ~ 3 million Nyquist sampled pixels on a 20" grid. The high sensitivity and large linear dynamic range of the maps in both isotopologues reveal a very complex, highly structured cloud morphology. There are large scale correlated structures evident in 13CO emission having very fine dimensions, including filaments, cavities, and rings. The 12CO emission shows a quite different structure, with particularly complex interfaces between regions of greater and smaller column density defining the boundaries of the largest-scale cloud structures. The axes of the striations seen in the 12CO emission from relatively diffuse gas are aligned with the direction of the magnetic field. Using a column density-dependent model for the CO fractional abundance, we derive the mass of the region mapped to be 24,000 solar masses, a factor of three greater than would be obtained with canonical CO abundance restricted to the high column density regions. We determine that half the mass of the cloud is in regions having column density below 2.1x10^{21} per square cm. The distribution of young stars in the region covered is highly nonuniform, with the probability of finding a star in a pixel with a specified column density rising sharply for N(H2) = 6x10^{21} cm^{-2}. We determine a relatively low star formation efficiency (mass of young stars/mass of molecular gas), between 0.3 and 1.2 %, and an average star formation rate during the past 3 Myr of 8x10^{-5} stars yr^{-1}.
[ { "version": "v1", "created": "Thu, 14 Feb 2008 23:34:07 GMT" } ]
"2009-12-08T00:00:00"
[ [ "Goldsmith", "Paul F.", "" ], [ "Heyer", "Mark", "" ], [ "Narayanan", "Gopal", "" ], [ "Snell", "Ronald", "" ], [ "Li", "Di", "" ], [ "Brunt", "Chris", "" ] ]
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802.2207
Simon Goodwin
Simon P Goodwin (Sheffield)
The effect of the dynamical state of clusters on gas expulsion and infant mortality
6 pages, 2 figures. Review talk given at the meeting on "Young massive star clusters - Initial conditions and environments", E. Perez, R. de Grijs, R. M. Gonzalez Delgado, eds., Granada (Spain), September 2007, Springer: Dordrecht. Replacement to correct mistake in a reference
Astrophys.Space Sci.324:259-263,2009
10.1007/s10509-009-0116-5
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The star formation efficiency (SFE) of a star cluster is thought to be the critical factor in determining if the cluster can survive for a significant (>50 Myr) time. There is an often quoted critical SFE of ~30 per cent for a cluster to survive gas expulsion. I reiterate that the SFE is not the critical factor, rather it is the dynamical state of the stars (as measured by their virial ratio) immediately before gas expulsion that is the critical factor. If the stars in a star cluster are born in an even slightly cold dynamical state then the survivability of a cluster can be greatly increased.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:13:38 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 12:34:00 GMT" } ]
"2009-12-04T00:00:00"
[ [ "Goodwin", "Simon P", "", "Sheffield" ] ]
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802.2208
Sabine Jansen
S. Jansen, E. H. Lieb, R. Seiler
Laughlin's function on a cylinder: plasma analogy and representation as a quantum polymer
11 pages, 2 figures
phys. stat. sol. (b) 245, 439 - 446 (2008)
10.1002/pssb.200743516
null
cond-mat.mes-hall
null
We investigate Laughlin's fractional quantum Hall effect wave function in the cylinder geometry of Laughlin's integer quantum Hall effect argument, at filling factor 1/3. We show that the plasma analogy leads to a periodic density, and that the wave function admits a representation as a ``quantum polymer'', reminiscent of the quantum dimer model by Rokhsar and Kivelson. We explain how the representation can be exploited to compute the normalization and one-particle density in the limit of infinitely many particles.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:01:52 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Jansen", "S.", "" ], [ "Lieb", "E. H.", "" ], [ "Seiler", "R.", "" ] ]
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802.2209
Santosh Kumar Rai
Santosh Kumar Rai
Associated Photons and New Physics Signals at Linear Colliders
Latex2E, 16 pages, 5 eps figures. Invited brief review for Mod. Phys. Lett. A
Mod.Phys.Lett.A23:73-89,2008
10.1142/S0217732308025942
HIP-2007-74/TH
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study signals for beyond standard model physics and consider the virtues of single photon signals or associated photons in the final states in identifying different scenarios of new physics models in a very efficient and novel way.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:26:18 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Rai", "Santosh Kumar", "" ] ]
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802.221
Mohsen Shadmehri
Fazeleh Khajenabi, Mohsen Shadmehri, Sami Dib
Thin accretion disc with a corona in a central magnetic field
Accepted for publication in Astrophysics & Space Science
Astrophys.Space Sci.314:251-260,2008
10.1007/s10509-008-9766-y
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the steady-state structure of an accretion disc with a corona surrounding a central, rotating, magnetized star. We assume that the magneto-rotational instability is the dominant mechanism of angular momentum transport inside the disc and is responsible for producing magnetic tubes above the disc. In our model, a fraction of the dissipated energy inside the disc is transported to the corona via these magnetic tubes. This energy exchange from the disc to the corona which depends on the disc physical properties is modified because of the magnetic interaction between the stellar magnetic field and the accretion disc. According to our fully analytical solutions for such a system, the existence of a corona not only increases the surface density but reduces the temperature of the accretion disc. Also, the presence of a corona enhances the ratio of gas pressure to the total pressure. Our solutions show that when the strength of the magnetic field of the central neutron star is large or the star is rotating fast enough, profiles of the physical variables of the disc significantly modify due to the existence of a corona.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:27:12 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Khajenabi", "Fazeleh", "" ], [ "Shadmehri", "Mohsen", "" ], [ "Dib", "Sami", "" ] ]
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802.2211
Dario Bambusi
D. Bambusi, A. Carati, T. Penati
Boundary effects on the dynamics of chains of coupled oscillators
null
null
10.1088/0951-7715/22/4/013
null
math.DS
http://creativecommons.org/licenses/by/3.0/
We study the dynamics of a chain of coupled particles subjected to a restoring force (Klein-Gordon lattice) in the cases of either periodic or Dirichlet boundary conditions. Precisely, we prove that, when the initial data are of small amplitude and have long wavelength, the main part of the solution is interpolated by a solution of the nonlinear Schr\"odinger equation, which in turn has the property that its Fourier coefficients decay exponentially. The first order correction to the solution has Fourier coefficients that decay exponentially in the periodic case, but only as a power in the Dirichlet case. In particular our result allows one to explain the numerical computations of the paper \cite{BMP07}.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:37:12 GMT" }, { "version": "v2", "created": "Fri, 17 Oct 2008 14:30:14 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Bambusi", "D.", "" ], [ "Carati", "A.", "" ], [ "Penati", "T.", "" ] ]
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802.2212
Tetsuo Hyodo
Tetsuo Hyodo (1 and 2), Wolfram Weise (1), Daisuke Jido (2), Luis Roca (3), Atsushi Hosaka (4) ((1) TU Muenchen, (2) YITP, Kyoto Univ., (3) Murcia Univ. (4) RCNP, Osaka Univ.)
Lambda(1405) in chiral SU(3) dynamics
4 pages, no figure, Talk given at Chiral Symmetry in Hadron and Nuclear Physics (Chiral07), November 13-16, 2007, Osaka Univ., Japan. v2: Typos corrected
Mod.Phys.Lett.A23:2393-2396,2008
10.1142/S0217732308029459
RCNP-Th08005
hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss several aspects of the Lambda(1405) resonance in relation to the recent theoretical developments in chiral dynamics. We derive an effective single-channel KbarK N interaction based on chiral SU(3) coupled-channel approach, emphasizing the important role of the pi Sigma channel and the structure of the Lambda(1405) in Kbar N phenomenology. In order to clarify the structure of the resonance, we study the behavior with the number of colors (Nc) of the poles associated with the Lambda(1405), and argue the physical meaning of the renormalization procedure.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:38:12 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 15:38:12 GMT" } ]
"2008-11-07T00:00:00"
[ [ "Hyodo", "Tetsuo", "", "1 and 2" ], [ "Weise", "Wolfram", "" ], [ "Jido", "Daisuke", "" ], [ "Roca", "Luis", "" ], [ "Hosaka", "Atsushi", "" ] ]
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802.2213
Moira Jardine
M.M. Jardine, S.G. Gregory and J.-F. Donati
Coronal structure of the cTTS V2129 Oph
10 pages, 9 figures
null
10.1111/j.1365-2966.2008.13103.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The nature of the magnetic coupling between T Tauri stars and their disks determines not only the mass accretion process but possibly the spin evolution of the central star. We have taken a recently-published surface magnetogram of one moderately-accreting T Tauri star (V2129 Oph) and used it to extrapolate the geometry of its large-scale field. We determine the structure of the open (wind-bearing) field lines, the closed (X-ray bright) field lines and those potentially accreting field lines that pass through the equatorial plane inside the Keplerian co-rotation radius. We consider a series of models in which the stellar magnetic field is opened up by the outward pressure of the hot coronal gas at a range of radii. As this radius is increased, accretion takes place along simpler field structures and impacts on fewer sites at the stellar surface. This is consistent with the observed variation in the Ca II IRT and HeI lines which suggests that accretion in the visible hemisphere is confined to a single high-latitude spot. By determining the density and velocity of the accretion flows, we find that in order to have most of the total mass accretion rate impacting on a single high-latitude region we need disk material to accrete from approximately 7R*, close to the Keplerian co-rotation radius at 6.8R*. We also calculate the coronal density and X-ray emission measure. We find that both the magnitude and rotational modulation of the emission measure increase as the source surface is increased. For the field structure of V2129 Oph which is dominantly octupolar, the emission forms a bright, high-latitude ring that is always in view as the star rotates. Since the accretion funnels are not dense enough to cause significant scattering of coronal X-ray photons, they provide only a low rotational modulation of around 10% at most.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:39:02 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Jardine", "M. M.", "" ], [ "Gregory", "S. G.", "" ], [ "Donati", "J. -F.", "" ] ]
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802.2214
Giorgio Matthiae
Giorgio Matthiae
The AUGER experiment - status and results
Conference
null
10.1142/9789812819093_0040
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Auger experiment was designed to study the high-energy cosmic rays by measuring the properties of the showers produced in the atmosphere. The Southern Auger Observatory has taken data since January 2004. Results on mass composition, energy spectrum and anisotropy of the arrival directions are presented. The most important result is the recent observation of correlations with nearby extragalactic objects.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:41:39 GMT" } ]
"2017-08-23T00:00:00"
[ [ "Matthiae", "Giorgio", "" ] ]
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802.2215
Andrea Ferroglia
R. Bonciani, A. Ferroglia, and A.A. Penin
Calculation of the Two-Loop Heavy-Flavor Contribution to Bhabha Scattering
43 pages, 8 figures; added references
JHEP0802:080,2008
10.1088/1126-6708/2008/02/080
ALBERTA-THY-24-07, IFIC/07-77, ZU-TH 31/07
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe in detail the calculation of the two-loop corrections to the QED Bhabha scattering cross section due to the vacuum polarization by heavy fermions. Our approach eliminates one mass scale from the most challenging part of the calculation and allows us to obtain the corrections in a closed analytical form. The result is valid for arbitrary values of the heavy fermion mass and the Mandelstam invariants, as long as s,t,u >> m_e^2.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:48:08 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 12:41:49 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Bonciani", "R.", "" ], [ "Ferroglia", "A.", "" ], [ "Penin", "A. A.", "" ] ]
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802.2216
Kashuba Alexander
A. Kashuba
Conductivity of the defectless Graphene
4 pages, 1 figure
null
10.1103/PhysRevB.78.085415
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Conductivity of the defectless, perfect crystal graphene is found at the neutrality point at zero temperature and in the limit of large dielectric constant of the substrate. The steady state of the graphene with weak current is assumed to be an ideal, rare plasma of particle and hole excitations governed by the Boltzmann kinetic equation.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:50:37 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Kashuba", "A.", "" ] ]
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802.2217
Richard W. Robinett
M. Belloni and R. W. Robinett
Quantum mechanical sum rules for two model systems
23 pages, no figures, to appear in Am. J. Phys
null
10.1119/1.2908194
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sum rules have played an important role in the development of many branches of physics since the earliest days of quantum mechanics. We present examples of one-dimensional quantum mechanical sum rules and apply them in two familiar systems, the infinite well and the single delta-function potential. These cases illustrate the different ways in which such sum rules can be realized, and the varying mathematical techniques by which they can be confirmed. Using the same methods, we also evaluate the second-order energy shifts arising from the introduction of a constant external field, namely the Stark effect.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 14:53:20 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Belloni", "M.", "" ], [ "Robinett", "R. W.", "" ] ]
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802.2218
Panagiota Kanti
Panagiota Kanti
Black Holes at the LHC
37 pages, 14 figures, lectures presented in the 4th Aegean Summer School on Black Holes, 17-22 September 2007, Lesvos, Greece, typos corrected, comments and references added
Lect.Notes Phys.769:387-423,2009
10.1007/978-3-540-88460-6_10
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In these two lectures, we will address the topic of the creation of small black holes during particle collisions in a ground-based accelerator, such as LHC, in the context of a higher-dimensional theory. We will cover the main assumptions, criteria and estimates for their creation, and we will discuss their properties after their formation. The most important observable effect associated with their creation is likely to be the emission of Hawking radiation during their evaporation process. After presenting the mathematical formalism for its study, we will review the current results for the emission of particles both on the brane and in the bulk. We will finish with a discussion of the methodology that will be used to study these spectra, and the observable signatures that will help us identify the black-hole events.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 10:43:18 GMT" }, { "version": "v2", "created": "Fri, 26 Sep 2008 14:35:48 GMT" } ]
"2009-02-16T00:00:00"
[ [ "Kanti", "Panagiota", "" ] ]
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802.2219
Roche Patrice
P. Roulleau, F. Portier, P. Roche, A. Cavanna, G. Faini, U. Gennser and D. Mailly
Noise dephasing in the edge states of the Integer Quantum Hall regime
~4 pages, 4 figures
Phys. Rev. Lett. 101, 186803 (2008)
10.1103/PhysRevLett.101.186803
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An electronic Mach Zehnder interferometer is used in the integer quantum hall regime at filling factor 2, to study the dephasing of the interferences. This is found to be induced by the electrical noise existing in the edge states capacitively coupled to each others. Electrical shot noise created in one channel leads to phase randomization in the other, which destroys the interference pattern. These findings are extended to the dephasing induced by thermal noise instead of shot noise: it explains the underlying mechanism responsible for the finite temperature coherence time $\tau_\phi(T)$ of the edge states at filling factor 2, measured in a recent experiment. Finally, we present here a theory of the dephasing based on Gaussian noise, which is found in excellent agreement with our experimental results.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:11:37 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Roulleau", "P.", "" ], [ "Portier", "F.", "" ], [ "Roche", "P.", "" ], [ "Cavanna", "A.", "" ], [ "Faini", "G.", "" ], [ "Gennser", "U.", "" ], [ "Mailly", "D.", "" ] ]
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802.222
Dr. Peter S"ule
P. S\"ule, M. Menyh\'ard
L\'evy-flight intermixing: anomalous nanoscale diffusion in Pt/Ti
4 pages, 3 figures
null
null
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Probing the anomalous nanoscale intermixing using molecular dynamics (MD) simulations in Pt/Ti bilayer we reveal the superdiffusive nature of interfacial atomic transport. It is shown that the Pt atoms undergo anomalous atomic transport across the anisotropic interface of Pt/Ti with suprisingly high rates which can be characterized as L\'evy flights. L\'evy flight is not a unique phenomenon in nature, however, no such events have been reported yet for bulk interdiffusion. In particular, the low-energy (0.5 keV) ion-sputtering induced transient enhanced intermixing has been studied by MD simulations. Ab initio density functional calculations have been used to check and reparametrize the employed heteronuclear interatomic potential. The L\'evy-intermixing behavior explains the high diffusity tail in the concentration profile obtained by Auger electron spectroscopy depth profiling (AES-DP) analysis in Pt/Ti bilayer (reported in ref.: P. S\"ule, {\em et al.}, J. Appl. Phys., {\bf 101}, 043502 (2007)).
[ { "version": "v1", "created": "Fri, 15 Feb 2008 12:53:41 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 14:33:58 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Süle", "P.", "" ], [ "Menyhárd", "M.", "" ] ]
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802.2221
Thorsten Feldmann
Guido Bell (Univ. Karlsruhe), Thorsten Feldmann (Univ. Siegen)
Modelling light-cone distribution amplitudes from non-relativistic bound states
27 pages, 15 figures, discussion around Eq.(83,84) extended
JHEP0804:061,2008
10.1088/1126-6708/2008/04/061
TTP08-07, SFB/CPP-08-13, SI-HEP-2007-20
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate light-cone distribution amplitudes for non-relativistic bound states, including radiative corrections from relativistic gluon exchange to first order in the strong coupling constant. We distinguish between bound states of quarks with equal (or similar) mass, m_1 ~ m_2, and between bound states where the quark masses are hierarchical, m_1 >> m_2. For both cases we calculate the distribution amplitudes at the non-relativistic scale and discuss the renormalization-group evolution for the leading-twist and 2-particle distributions. Our results apply to hard exclusive reactions with non-relativistic bound states in the QCD factorization approach like, for instance, (B_c -> eta_c l nu) or (e^+ e^- -> J/psi eta_c). They also serve as a toy model for light-cone distribution amplitudes of light mesons or heavy B and D mesons, for which certain model-independent properties can be derived. In particular, we calculate the anomalous dimension for the B meson distribution amplitude phi_B^-(w) in the Wandzura-Wilczek approximation and derive the according solution of the evolution equation at leading logarithmic accuracy.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:14:36 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 12:58:44 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Bell", "Guido", "", "Univ. Karlsruhe" ], [ "Feldmann", "Thorsten", "", "Univ. Siegen" ] ]
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802.2222
Sadhan Adhikari K
S. K. Adhikari
Nonlinear Schr\"odinger equation for a superfluid Fermi gas from BCS to Bose crossover
4 pages, 5 figures
Phys. Rev. A 77 (2008) 045602 (pp1=4)
10.1103/PhysRevA.77.045602
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a quasi-analytic nonlinear Schr\"odinger equation with beyond mean-field corrections to describe the dynamics of a zero-temperature dilute superfluid Fermi gas in the crossover from the weak-coupling Bardeen-Cooper-Schrieffer (BCS) regime, where $k_F|a| \ll 1$ with $a$ the s-wave scattering length and $k_F$ the Fermi momentum, through the unitarity limit, $k_Fa \to \pm \infty$, to the Bose regime where $k_Fa >0$. The energy of our model is parametrized using the known asymptotic behavior in the BCS, Bose, and the unitarity limits and is in excellent agreement with accurate Green function Monte Carlo calculations. The model generates good results for frequencies of collective breathing oscillation of a trapped Fermi superfluid.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:15:30 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Adhikari", "S. K.", "" ] ]
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802.2223
Chung-Yu Mou
Chih-Hui Wu and Chung-Yu Mou
Method of Image and Transmission through Semi-infinite Nanowires
2 fgiures
Physica E 40, 745 (2008)
10.1016/j.physe.2007.09.203
null
cond-mat.mes-hall cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The method of functional integral bosonization is extended to examine the transmission properties of semi-infinite nanowires. In particular, it is shown that edge states will arise at the end point of the dimerized semi-infinite spin-chain and by combining the method of image and the bosonization technique, the system can be properly bosonized. Based on the bosonized action and a renormalization group analysis, it is shown that unlike scattering due to single bulk impurity in the nanowire, the scattering potential remains relevant even for slightly attractive potential due to the interaction between the edge state and its image. When the strength of potential goes beyond a critical strength, the tip of the semi-infinite nanowire may become insulating.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:17:55 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Wu", "Chih-Hui", "" ], [ "Mou", "Chung-Yu", "" ] ]
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802.2224
Dunja Fabjan
D. Fabjan, L. Tornatore, S. Borgani, A. Saro and K. Dolag
Evolution of the metal content of the intra-cluster medium with hydrodynamical simulations
9 pages, 7 figures, to appear in MNRAS
null
10.1111/j.1365-2966.2008.13122.x
null
astro-ph
null
We present a comparison between simulation results and X-ray observational data on the evolution of the metallicity of the intra-cluster medium (ICM). The simulations of galaxy clusters were performed with the Tree-SPH Gadget2 code that includes a detailed model of chemical evolution, by assuming three different shapes for the stellar initial mass function (IMF), namely the Salpeter (1955), Kroupa (2001) and Arimoto-Yoshii (1987) IMF. Our simulations predict significant radial gradients of the Iron abundance, which extend over the whole cluster virialized region. At larger radii, we do not detect any flattening of the metallicity profiles. As for the evolution of the ICM metal (Iron) abundance out to z=1, we find that it is determined by the combined action of (i) the sinking of already enriched gas, (ii) the ongoing metal production in galaxies and (iii) the locking of ICM metals in newborn stars. As a result, rather than suppressing the metallicity evolution, stopping star formation at z=1 has the effect of producing an even too fast evolution of the emission-weighted ICM metallicity with too high values at low redshift. Finally, we compare simulations with the observed rate of type-Ia supernovae per unit B-band luminosity (SnU_B). We find that our simulated clusters do not reproduce the decreasing trend of SnU_B at low redshift, unless star formation is truncated at z=1.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 16:02:05 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Fabjan", "D.", "" ], [ "Tornatore", "L.", "" ], [ "Borgani", "S.", "" ], [ "Saro", "A.", "" ], [ "Dolag", "K.", "" ] ]
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802.2225
Andrew Stacey
Andrew Stacey
Comparative Smootheology
48 pages, uses tikz and pxfonts, considerably rewritten
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compare various different definitions of "the category of smooth objects". The definitions compared are due to Chen, Fr\"olicher, Sikorski, Smith, and Souriau. The method of comparison is to construct functors between the categories that enable us to see how the categories relate to each other. This produces a diagram of categories with the category of Fr\"olicher spaces sitting at its centre. Our method of study involves finding a general context into which these categories can be placed. This involves considering categories wherein objects are considered in relation to a certain collection of standard test objects. This therefore applies beyond the question of categories of smooth spaces.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:26:28 GMT" }, { "version": "v2", "created": "Fri, 21 May 2010 14:13:16 GMT" } ]
"2010-05-24T00:00:00"
[ [ "Stacey", "Andrew", "" ] ]
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802.2226
Sergio Manzi
S. Manzi, R.E. Belardinelli, G. Costanza and V. D. Pereyra
Adsorption-Desorption Kinetics: A Review of a Classical Problem
19 pages, 10 figures
null
null
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we have analyzed the adsorption-desorption kinetics in the framework of the lattice gas model. We have shown that the coefficients representing the transition probabilities must be carefully chosen even when they fulfill the principle of detailed balance, otherwise the observables arising from the kinetics present anomalous behavior. We have demonstrated that when the adsorption $A_i$ and desorption $D_i$ coefficients are linearly related through a parameter $\gamma$, there are values of lateral interaction, $V$, that lead to bad behavior in the kinetics. We have shown a phase diagram for the allowed values of $V$ and $\gamma$, concluding that detailed balance does not guarantee a correct physical behavior of the observables obtained from the rate equations like adsorption isotherms, sticking coefficients and thermal desorption spectra. Alternatively, we have introduced a description of the adsorption-desorption processes based in a simple but consistent energetic argument that leads to a correct behavior of the observables without physical inconsistencies.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:22:09 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 20:31:39 GMT" } ]
"2008-06-02T00:00:00"
[ [ "Manzi", "S.", "" ], [ "Belardinelli", "R. E.", "" ], [ "Costanza", "G.", "" ], [ "Pereyra", "V. D.", "" ] ]
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802.2227
Andreas Reisenegger
Andreas Reisenegger (PUC, Santiago, Chile)
Neutron stars and their magnetic fields
To appear in Revista Mexicana de Astronomia y Astrofisica, as part of the proceedings of the XII Latin American Regional IAU Meeting, held on Isla Margarita, Venezuela, 22-26 October 2007. Spanish and English abstract, English text, 7 pages, no figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutron stars have the strongest magnetic fields known anywhere in the Universe. In this review, I intend to give a pedagogical discussion of some of the related physics. Neutron stars exist because of Pauli's exclusion principle, in two senses: 1) It makes it difficult to squeeze particles too close together, in this way allowing a mechanical equilibrium state in the presence of extremely strong gravity. 2) The occupation of low-energy proton and electron states makes it impossible for low-energy neutrons to beta decay. A corollary of the second statement is that charged particles are necessarily present inside a neutron star, allowing currents to flow. Since these particles are degenerate, they collide very little, and therefore make it possible for the star to support strong, organized magnetic fields over long times. These show themselves in pulsars and are the most likely energy source for the high X-ray and gamma-ray luminosity ``magnetars''. I briefly discuss the possible origin of this field and some physical constraints on its equilibrium configurations.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:43:20 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Reisenegger", "Andreas", "", "PUC, Santiago, Chile" ] ]
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802.2228
Sebastian Ordyniak
Stephan Kreutzer, Sebastian Ordyniak
Digraph Decompositions and Monotonicity in Digraph Searching
null
null
null
null
cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider monotonicity problems for graph searching games. Variants of these games - defined by the type of moves allowed for the players - have been found to be closely connected to graph decompositions and associated width measures such as path- or tree-width. Of particular interest is the question whether these games are monotone, i.e. whether the cops can catch a robber without ever allowing the robber to reach positions that have been cleared before. The monotonicity problem for graph searching games has intensely been studied in the literature, but for two types of games the problem was left unresolved. These are the games on digraphs where the robber is invisible and lazy or visible and fast. In this paper, we solve the problems by giving examples showing that both types of games are non-monotone. Graph searching games on digraphs are closely related to recent proposals for digraph decompositions generalising tree-width to directed graphs. These proposals have partly been motivated by attempts to develop a structure theory for digraphs similar to the graph minor theory developed by Robertson and Seymour for undirected graphs, and partly by the immense number of algorithmic results using tree-width of undirected graphs and the hope that part of this success might be reproducible on digraphs using a directed tree-width. Unfortunately the number of applications for the digraphs measures introduced so far is still small. We therefore explore the limits of the algorithmic applicability of digraph decompositions. In particular, we show that various natural candidates for problems that might benefit from digraphs having small directed tree-width remain NP-complete even on almost acyclic graphs.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:44:34 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Kreutzer", "Stephan", "" ], [ "Ordyniak", "Sebastian", "" ] ]
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802.2229
Stephane Menozzi
Valentin Konakov (CMI RAS), Stephane Menozzi (PMA), Stanislav Molchanov
Explicit parametrix and local limit theorems for some degenerate diffusion processes
33 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a class of degenerate diffusion processes of rank 2, i.e. when only Poisson brackets of order one are needed to span the whole space, we obtain a parametrix representation of the density from which we derive some explicit Gaussian controls that characterize the additional singularity induced by the degeneracy. We then give a local limit theorem with the usual convergence rate for an associated Markov chain approximation. The key point is that the "weak" degeneracy allows to exploit the techniques first introduced by Konakov and Molchanov and then developed by Konakov and Mammen that rely on Gaussian approximations.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:45:41 GMT" }, { "version": "v2", "created": "Wed, 18 Feb 2009 15:25:33 GMT" } ]
"2009-02-18T00:00:00"
[ [ "Konakov", "Valentin", "", "CMI RAS" ], [ "Menozzi", "Stephane", "", "PMA" ], [ "Molchanov", "Stanislav", "" ] ]
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802.223
Andrew Randono
Andrew Randono
Canonical Lagrangian Dynamics and General Relativity
Version published in Classical and Quantum Gravity. Significant content and references added
Class.Quant.Grav.25:205017,2008
10.1088/0264-9381/25/20/205017
null
gr-qc hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Building towards a more covariant approach to canonical classical and quantum gravity we outline an approach to constrained dynamics that de-emphasizes the role of the Hamiltonian phase space and highlights the role of the Lagrangian phase space. We identify a "Lagrangian one-form" to replace the standard symplectic one-form, which we use to construct the canonical constraints and an associated constraint algebra. The method is particularly useful for generally covariant systems and systems with a degenerate canonical symplectic form, such as Einstein Cartan gravity, to which we apply the method explicitly. We find that one can demonstrate the closure of the constraints without gauge fixing the Lorentz group or introducing primary constraints on the phase space variables. Finally, using geometric quantization techniques, we briefly discuss implications of the formalism for the quantum theory.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:49:30 GMT" }, { "version": "v2", "created": "Thu, 9 Oct 2008 02:15:08 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Randono", "Andrew", "" ] ]
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802.2231
Sadhan Adhikari K
S. K. Adhikari
Josephson oscillation of a superfluid Fermi gas
7 pages, 10 figures
Eur. Phys. J. D 47 (2008) 413-420
10.1140/epjd/e2008-00044-0
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the complete numerical solution of a time-dependent three-dimensional mean-field model we study the Josephson oscillation of a superfluid Fermi gas (SFG) at zero temperature formed in a combined axially-symmetric harmonic plus one-dimensional periodic optical-lattice (OL) potentials after displacing the harmonic trap along the axial OL axis. We study the dependence of Josephson frequency on the strength of the OL potential. The Josephson frequency decreases with increasing strength as found in the experiment of Cataliotti et al. [Science 293 (2001) 843] for a Bose-Einstein condensate and of the experiment of Pezze et al. [Phys. Rev. Lett. 93 (2004) 120401] for an ideal Fermi gas. We demonstrate a breakdown of Josephson oscillation in the SFG for a large displacement of the harmonic trap. These features of Josephson oscillation of a SFG can be tested experimentally.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:50:10 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Adhikari", "S. K.", "" ] ]
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802.2232
Gail Dodge
Y. Prok, P. Bosted, V.D. Burkert, A. Deur, K.V. Dharmawardane, G.E. Dodge, K.A. Griffioen, S.E. Kuhn, R. Minehart, and the CLAS Collaboration
Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2
Final version as published in PLB. Added a parametrization of world data at high Q^2 to Fig. 3
Phys.Lett.B672:12-16,2009
10.1016/j.physletb.2008.12.063
JLAB-PHY-08-778
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spin structure functions g_1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH_3 and ND_3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q^2 < 5 GeV^2 and W < 3 GeV. The first moments of g_1 for the proton and deuteron are presented -- both have a negative slope at low Q^2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first result for the generalized forward spin polarizability of the proton gamma_0^p is also reported. This quantity shows strong Q^2 dependence at low Q^2, while Q^6\gamma_0^p seems to flatten out at the highest Q^2 accessed by our experiment. Although the first moments of g_1 are consistent with Chiral Perturbation Theory (ChPT) calculations up to approximately Q^2 = 0.06 GeV^2, a significant discrepancy is observed between the \gamma_0^p data and ChPT for gamma_0^p, even at the lowest Q2.
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"2010-04-06T00:00:00"
[ [ "Prok", "Y.", "" ], [ "Bosted", "P.", "" ], [ "Burkert", "V. D.", "" ], [ "Deur", "A.", "" ], [ "Dharmawardane", "K. V.", "" ], [ "Dodge", "G. E.", "" ], [ "Griffioen", "K. A.", "" ], [ "Kuhn", "S. E.", "" ], [ "Minehart", "R.", "" ], [ "Collaboration", "the CLAS", "" ] ]
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802.2233
Tobias Brandes
Tobias Brandes
Waiting Times and Noise in Single Particle Transport
null
Ann. Phys. (Berlin) 17, No. 7, 477-496 (2008)
10.1002/andp.200810306
null
cond-mat.mes-hall quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The waiting time distribution $w(\tau)$, i.e. the probability for a delay $\tau$ between two subsequent transition (`jumps') of particles, is a statistical tool in (quantum) transport. Using generalized Master equations for systems coupled to external particle reservoirs, one can establish relations between $w(\tau)$ and other statistical transport quantities such as the noise spectrum and the Full Counting Statistics. It turns out that $w(\tau)$ usually contains additional information on system parameters and properties such as quantum coherence, the number of internal states, or the entropy of the current channels that participate in transport.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 15:58:10 GMT" } ]
"2008-06-06T00:00:00"
[ [ "Brandes", "Tobias", "" ] ]
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802.2234
Christoph Schommer
Christoph Schommer, Conny Uhde
Textual Fingerprinting with Texts from Parkin, Bassewitz, and Leander
11 pages, 4 Figures
null
null
null
cs.CL cs.CR
null
Current research in author profiling to discover a legal author's fingerprint does not only follow examinations based on statistical parameters only but include more and more dynamic methods that can learn and that react adaptable to the specific behavior of an author. But the question on how to appropriately represent a text is still one of the fundamental tasks, and the problem of which attribute should be used to fingerprint the author's style is still not exactly defined. In this work, we focus on linguistic selection of attributes to fingerprint the style of the authors Parkin, Bassewitz and Leander. We use texts of the genre Fairy Tale as it has a clear style and texts of a shorter size with a straightforward story-line and a simple language.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 16:14:09 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Schommer", "Christoph", "" ], [ "Uhde", "Conny", "" ] ]
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802.2235
Sven van Teeffelen
Sven van Teeffelen, Christos N. Likos, Hartmut L\"owen
Colloidal crystal growth at externally imposed nucleation clusters
4 pages, accepted for publication in Phys. Rev. Lett
null
10.1103/PhysRevLett.100.108302
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the conditions under which and how an imposed cluster of fixed colloidal particles at prescribed positions triggers crystal nucleation from a metastable colloidal fluid. Dynamical density functional theory of freezing and Brownian dynamics simulations are applied to a two-dimensional colloidal system with dipolar interactions. The externally imposed nucleation clusters involve colloidal particles either on a rhombic lattice or along two linear arrays separated by a gap. Crystal growth occurs after the peaks of the nucleation cluster have first relaxed to a cutout of the stable bulk crystal.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 16:25:49 GMT" } ]
"2009-11-13T00:00:00"
[ [ "van Teeffelen", "Sven", "" ], [ "Likos", "Christos N.", "" ], [ "Löwen", "Hartmut", "" ] ]
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802.2236
Jean-Pierre Luminet
Jean-Pierre Luminet
The Shape and Topology of the Universe
21 pages, 11 figures. Proceedings of conference "Tessellations : The world a jigsaw", Leyden (Netherlands), march 2006
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
What is the shape of the Universe? Is it curved or flat, finite or infinite ? Is space "wrapped around" to create ghost images of faraway cosmic sources? We review how tessellations allow to build multiply-connected 3D Riemannian spaces useful for cosmology. We discuss more particularly the proposal of a finite, positively curved, dodecahedral space for explaining some puzzling features of the cosmic microwave background radiation, as revealed by the 2003-2006 WMAP data releases.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 16:35:11 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Luminet", "Jean-Pierre", "" ] ]
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802.2237
Rachel Rosen
J. Christopher Clemens, R. Rosen
A Pulsational Model for the Orthogonal Polarization Modes in Radio Pulsars
19 pages, 4 figures accepted ApJ
null
10.1086/587474
null
astro-ph
null
In an earlier paper, we introduced a model for pulsars in which non-radial oscillations of high spherical degree (\el) aligned to the magnetic axis of a spinning neutron star were able to reproduce subpulses like those observed in single-pulse measurements of pulsar intensity. The model did not address polarization, which is an integral part of pulsar emission. Observations show that many pulsars emit radio waves that appear to be the superposition of two linearly polarized emission modes with orthogonal polarization angles. In this paper, we extend our model to incorporate linear polarization. As before, we propose that pulsational displacements of stellar material modulate the pulsar emission, but now we apply this modulation to a linearly-polarized mode of emission, as might be produced by curvature radiation. We further introduce a second polarization mode, orthogonal to the first, that is modulated by pulsational velocities. We combine these modes in superposition to model the observed Stokes parameters in radio pulsars.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:35:58 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 22:09:06 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Clemens", "J. Christopher", "" ], [ "Rosen", "R.", "" ] ]
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802.2238
Joel Eaton
Joel A. Eaton, Gregory W. Henry, and Andrew P. Odell
Orbits and Pulsations of the Classical \zeta Aurigae Binaries
Accepted for publication in ApJ
null
10.1086/587452
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have derived new orbits for zeta Aur, 32 Cyg, and 31 Cyg with observations from the TSU Automatic Spectroscopic Telescope and used them to identify non-orbital velocities of the cool supergiant components of these systems. We measure periods in those deviations, identify unexpected long-period changes in the radial velocities, and place upper limits on the rotation of these stars. These radial-velocity variations are not obviously consistent with radial pulsation theory, given what we know about the masses and sizes of the components. Our concurrent photometry detected the non-radial pulsations driven by tides (ellipsoidal variation) in both zeta Aur and 32 Cyg, at a level and phasing roughly consistent with simple theory to first order, although they seem to require moderately large gravity darkening. However, the K component of 32 Cyg must be considerably bigger than expected, or have larger gravity darkening than zeta Aur, to fit its amplitude. However, again there is precious little evidence for the normal radial pulsation of cool stars in our photometry. H-alpha shows some evidence for chromospheric heating by the B component in both zeta Aur and 32 Cyg, and the three stars show among them a meager ~ 2--3 outbursts in their winds of the sort seen occasionally in cool supergiants. We point out two fundamental questions in the interpretation of these stars, (1) whether it is appropriate to model the surface brightness as gravity darkening and (2) whether much of the non-orbital velocity structure may actually represent changes in the convective flows in the stars' atmospheres.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 16:45:39 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Eaton", "Joel A.", "" ], [ "Henry", "Gregory W.", "" ], [ "Odell", "Andrew P.", "" ] ]
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802.2239
Gijs Nelemans
Gijs Nelemans (Nijmegen), Rasmus Voss (MPE), Gijs Roelofs (CfA), Cees Bassa (McGill)
Limits on the X-ray and optical luminosity of the progenitor of the type Ia supernova SN2007sr
Revised to match version accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13416.x
null
astro-ph
null
We present HST/WFPC2, GALEX and Chandra observations of the position of the type Ia supernova SN2007sr in the Antennae galaxies, taken before the explosion. No source is found in any of the observations, allowing us to put interesting constraints on the progenitor luminosity. In total there is about 450 kilosecond of Chandra data, spread over 7 different observations. Limiting magnitudes of FUV (23.7 AB mag), NUV (23.8 AB mag), F555W (26.5 Vega mag) and F814W (24.5-25 Vega mag) are derived. The distance to the Antennae is surprisingly poorly known, with almost a factor of 2 difference between the latest distance based on the tip of the red giant branch (13.3 Mpc) and the distance derived from the SN2007sr light curve (25 Mpc). Using these distances we derive limits on absolute optical and UV magnitudes of any progenitor but these are still above the brightest (symbiotic) proposed progenitors. From the Chandra data a 3 sigma upper limit to the X-ray luminosity of 0.5 -- 8.0 10^37 erg/s in the 0.3-1 keV range is found. This is below the X-ray luminosity of the potential progenitor of the type Ia supernova 2007on that we recently discovered and for which we report a corrected X-ray luminosity. If that progenitor is confirmed it suggests the two supernovae have different progenitors. The X-ray limit is comparable to the brightest supersoft X-ray sources in the Galaxy, the LMC and the SMC and significantly below the luminosities of the brightest supersoft and quasi-soft X-ray sources found in nearby galaxies, ruling out such sources as progenitors of this type Ia supernova.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 16:59:11 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 08:16:03 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Nelemans", "Gijs", "", "Nijmegen" ], [ "Voss", "Rasmus", "", "MPE" ], [ "Roelofs", "Gijs", "", "CfA" ], [ "Bassa", "Cees", "", "McGill" ] ]
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802.224
Scott Anderson
S.F. Anderson, A.C. Becker, D. Haggard, J.L. Prieto, G.R. Knapp, M. Sako, K.B. Halford, S. Jha, B. Martin, J. Holtzman, J.A. Frieman, P.M. Garnavich, S. Hayward, Z. Ivezic, A.S. Mukadam, B. Sesar, P. Szkody, V. Malanushenko, M.W. Richmond, D. P. Schneider, and D. G. York
Two More Candidate AM Canum Venaticorum (AM CVn) Binaries from the Sloan Digital Sky Survey
19 pages, 5 figures, 1 table; submitted to AJ
Astron.J.135:2108-2113,2008
10.1088/0004-6256/135/6/2108
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
AM CVn systems are a select group of ultracompact binaries with the shortest orbital periods of any known binary subclass; mass-transfer is likely from a low-mass (partially-)degenerate secondary onto a white dwarf primary, driven by gravitational radiation. In the past few years, the Sloan Digital Sky Survey (SDSS) has provided five new AM CVns. Here we report on two further candidates selected from more recent SDSS data. SDSS J1208+3550 is similar to the earlier SDSS discoveries, recognized as an AM CVn via its distinctive spectrum which is dominated by helium emission. From the expanded SDSS Data Release 6 (DR6) spectroscopic area, we provide an updated surface density estimate for such AM CVns of order 10^{-3.1} to 10^{-2.5} per deg^2 for 15<g<20.5. In addition, we present another new candidate AM CVn, SDSS J2047+0008, that was discovered in the course of followup of SDSS-II supernova candidates. It shows nova-like outbursts in multi-epoch imaging data; in contrast to the other SDSS AM CVn discoveries, its (outburst) spectrum is dominated by helium absorption lines, reminiscent of KL Dra and 2003aw. The variability selection of SDSS J2047+0008 from the 300 deg^2 of SDSS Stripe 82 presages further AM CVn discoveries in future deep, multicolor, and time-domain surveys such as LSST. The new additions bring the total SDSS yield to seven AM CVns thus far, a substantial contribution to this rare subclass, versus the dozen previously known.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:05:17 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Anderson", "S. F.", "" ], [ "Becker", "A. C.", "" ], [ "Haggard", "D.", "" ], [ "Prieto", "J. L.", "" ], [ "Knapp", "G. R.", "" ], [ "Sako", "M.", "" ], [ "Halford", "K. B.", "" ], [ "Jha", "S.", "" ], [ "Martin", "B.", "" ], [ "Holtzman", "J.", "" ], [ "Frieman", "J. A.", "" ], [ "Garnavich", "P. M.", "" ], [ "Hayward", "S.", "" ], [ "Ivezic", "Z.", "" ], [ "Mukadam", "A. S.", "" ], [ "Sesar", "B.", "" ], [ "Szkody", "P.", "" ], [ "Malanushenko", "V.", "" ], [ "Richmond", "M. W.", "" ], [ "Schneider", "D. P.", "" ], [ "York", "D. G.", "" ] ]
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802.2241
Miriam Giorgini
G. Giacomelli (University of Bologna and INFN Sezione di Bologna)
Hadron-nuclei collisions at high energies
In honour of Dumitru B. Ion
Rom.Rep.Phys.60:193-204,2008
null
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A brief historical review is made of the hadron-hadron (hh) total cross section and hadron-nucleus absorption cross section measurements, made mainly at high energy proton synchrotrons. Then I shall discuss low p_tprocesses, including diffraction processes and fragmentation of nuclei in nucleus-nucleus collisions. Nucleus-nucleus collisions at higher energy colliders are then considered, mainly in the context of the search for the gluon quark plasma. Conclusions and a short discussion on perspectives follow.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:05:38 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Giacomelli", "G.", "", "University of Bologna and INFN Sezione di Bologna" ] ]
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802.2242
E. I. Vorobyov
E. I. Vorobyov (1 and 2), Shantanu Basu (3) ((1) Institute for Computational Astrophysics, Saint Mary's University, Halifax, Canada, (2) Institute of Physics, South Federal University, Rostov-on-Don, Russia, (3) The University of Western Ontario, London, Canada)
Mass accretion rates in self-regulated disks of T Tauri stars
Accepted for publication in ApJ Letters
null
10.1086/587514
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have studied numerically the evolution of protostellar disks around intermediate and upper mass T Tauri stars (0.25 M_sun < M_st < 3.0 M_sun) that have formed self-consistently from the collapse of molecular cloud cores. In the T Tauri phase, disks settle into a self-regulated state, with low-amplitude nonaxisymmetric density perturbations persisting for at least several million years. Our main finding is that the global effect of gravitational torques due to these perturbations is to produce disk accretion rates that are of the correct magnitude to explain observed accretion onto T Tauri stars. Our models yield a correlation between accretion rate M_dot and stellar mass M_st that has a best fit M_dot \propto M_st^{1.7}, in good agreement with recent observations. We also predict a near-linear correlation between the disk accretion rate and the disk mass.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:06:13 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Vorobyov", "E. I.", "", "1 and 2" ], [ "Basu", "Shantanu", "" ] ]
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802.2243
Gisela Romero G.A.R
G. A. Romero (1 and 2) and C. E. Cappa (1 and 2) ((1) Instituto Argentino de Radioastronom\'ia and (2) Facultad de Ciencias Astron\`omicas y Geof\'isicas, Universidad Nacional de La Plata, Argentina)
Sh2-205: I. The surrounding interstellar medium
Accepted for publication in MNRAS. 10 figures and 6 tables
null
10.1111/j.1365-2966.2008.13117.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a study of the HII region Sh2-205 and its environs, based on data obtained from the CGPS, 12CO observations, and MSX data. We find that Sh2-205 can be separated in three independent optical structures: SH 149.25-0.0, SH 148.83-0.67, and LBN 148.11-0.45. The derived spectral indices show the thermal nature of SH 148.83-0.67 and LBN 148.11-0.45. The morphology of SH 148.83-0.67, both in the optical and radio data, along with the energetic requ irements indicate that this feature is an interstellar bubble powered by the UV photons of HD 24431 (O9 III). LBN 148.11-0.45 has the morphology of a classic al HII region and their ionizing sources remain uncertain. Dust and molecular gas are found related to LBN 148.11-0.45.Particularly, a photodissociation region is detected at the interface between the ionized and molecular regions. If the proposed exciting star HD 24094 were an O8--O9 type star, as suggested by its near-infrared colors, its UV photon flux would be enough to explain the ionization of the nebula. The optical, radio continuum, and 21-cm line data allow us to conclude that SH 148.83-0.67 is an interstellar bubble powered by the energetic action of HD 24431. The associated neutral atomic and ionized masses are 180 Mo and 300 Mo, respectively. The emission of SH 149.25-0.0 is too faint to derive the dust and gas parameters. An HI shell centered at (l,b) = (149.0, 1.5) was also identified. It correlates morphologically with molecular gas emission. The neutral atomic and molecular masses are 1600 Mo and 2.6 x 10^4 Mo, respectively. The open cluster NGC 1444 is the most probable responsible for shaping this HI structure.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:08:03 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 15:15:15 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Romero", "G. A.", "", "1 and 2" ], [ "Cappa", "C. E.", "", "1 and 2" ] ]
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802.2244
Bob Eisenberg
Bob Eisenberg
Understanding Life with Molecular Dynamics and Thermodynamics: Comment on Nature 451, 240-243 (2008)
Comment on Nature 451, 240-243 (2008)
null
null
null
q-bio.BM q-bio.QM
null
One of the important challenges facing high resolution molecular dynamics calculations is to reproduce biological functions that occur in the macroscopic world and involve macroscopic variables. Some of these functions can be well described by reduced models, with few parameters, over a wide range of conditions, even though the functions are complex. We are all eager to see how molecular dynamics will accurately estimate the thermodynamic variables that define and control so many macroscopic biological functions.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 20:42:58 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 21:04:50 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Eisenberg", "Bob", "" ] ]
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802.2245
Ramesh Karuppusamy
Ramesh Karuppusamy, Ben Stappers, Willem van Straten
PuMaII: A wide band pulsar machine for the WSRT
29 pages, 8 figures. To appear in February issue of the PASP
null
10.1086/528699
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Pulsar Machine II (PuMa II) is the new flexible pulsar processing backend system at the Westerbork Synthesis Radio Telescope (WSRT), specifically designed to take advantage of the upgraded WSRT. The instrument is based on a computer cluster running the Linux operating system, with minimal custom hardware. A maximum of 160 MHz analogue bandwidth sampled as 8X20 MHz subbands with 8-bit resolution can be recorded on disks attached to separate computer nodes. Processing of the data is done in the additional 32-nodes allowing near real time coherent dedispersion for most pulsars observed at the WSRT. This has doubled the bandwidth for pulsar observations in general, and has enabled the use of coherent dedispersion over a bandwidth eight times larger than was previously possible at the WSRT. PuMa II is one of the widest bandwidth coherent dedispersion machines currently in use and has a maximum time resolution of 50ns. The system is now routinely used for high precision pulsar timing studies, polarization studies, single pulse work and a variety of other observational work.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:09:25 GMT" } ]
"2017-04-05T00:00:00"
[ [ "Karuppusamy", "Ramesh", "" ], [ "Stappers", "Ben", "" ], [ "van Straten", "Willem", "" ] ]
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802.2246
Gabriel Gonzalez
Gabriel Gonzalez
Quantum bouncer with quadratic dissipation
Accepted for publication in Rev. Mex. Fis
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The energy loss due to a quadratic velocity dependent force on a quantum particle bouncing on a perfectly reflecting surface is obtained for a full cycle of motion. We approach this problem by means of a new effective phenomenological Hamiltonian which corresponds to the actual energy of the system and obtained the correction to the eigenvalues of the energy in first order quantum perturbation theory for the case of weak dissipation.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:10:53 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Gonzalez", "Gabriel", "" ] ]
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802.2247
Hans Kr\"uger
H. Kr\"uger, J. Fink, E. Kraft, N. Wermes, P. Fischer, I. Peric, C. Herrmann, M. Overdick, W. R\"utten
CIX - A Detector for Spectral Enhanced X-ray Imaging by Simultaneous Counting and Integrating
12 pages, 14 figures, SPIE Medical Imaging Conference, San Diego, 2008
null
10.1117/12.771706
null
physics.ins-det physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A hybrid pixel detector based on the concept of simultaneous charge integration and photon counting will be presented. The second generation of a counting and integrating X-ray prototype CMOS chip (CIX) has been operated with different direct converting sensor materials (CdZnTe and CdTe) bump bonded to its 8x8 pixel matrix. Photon counting devices give excellent results for low to medium X-ray fluxes but saturate at high rates while charge integration allows the detection of very high fluxes but is limited at low rates by the finite signal to noise ratio. The combination of both signal processing concepts therefore extends the resolvable dynamic range of the X-ray detector. In addition, for a large region of the dynamic range, where counter and integrator operate simultaneously, the mean energy of the detected X-ray spectrum can be calculated. This spectral information can be used to enhance the contrast of the X-ray image. The advantages of the counting and integrating signal processing concept and the performance of the imaging system will be reviewed. The properties of the system with respect to dynamic range and sensor response will be discussed and examples of imaging with additional spectral information will be presented.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 09:51:23 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Krüger", "H.", "" ], [ "Fink", "J.", "" ], [ "Kraft", "E.", "" ], [ "Wermes", "N.", "" ], [ "Fischer", "P.", "" ], [ "Peric", "I.", "" ], [ "Herrmann", "C.", "" ], [ "Overdick", "M.", "" ], [ "Rütten", "W.", "" ] ]
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802.2248
Elena Agliari
E. Agliari
Exact mean first-passage time on the T-graph
6 pages
Phys. Rev. E 77, 011128 (2008)
10.1103/PhysRevE.77.011128
null
physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a simple random walk on the T-fractal and we calculate the exact mean time $\tau^g$ to first reach the central node $i_0$. The mean is performed over the set of possible walks from a given origin and over the set of starting points uniformly distributed throughout the sites of the graph, except $i_0$. By means of analytic techniques based on decimation procedures, we find the explicit expression for $\tau^g$ as a function of the generation $g$ and of the volume $V$ of the underlying fractal. Our results agree with the asymptotic ones already known for diffusion on the T-fractal and, more generally, they are consistent with the standard laws describing diffusion on low-dimensional structures.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:17:41 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Agliari", "E.", "" ] ]
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802.2249
Joshua Bloom
J. S. Bloom (UC Berkeley), D. L. Starr (UCB; Las Cumbres Observatory Global Telescope Network), N. R. Butler (UCB), P. Nugent (LBL), M. Rischard (UCB), D. Eads (UC Santa Cruz; LANL), D. Poznanski (UCB)
Towards a Real-time Transient Classification Engine
4 pages, refereed proceedings of "Hot-wiring the Transient Universe," June 2007 (Tuscon). Editors: A. Allan, R. Seaman, J. S. Bloom
Astron.Nachr.329:284-287,2008
10.1002/asna.200710957
null
astro-ph
null
Temporal sampling does more than add another axis to the vector of observables. Instead, under the recognition that how objects change (and move) in time speaks directly to the physics underlying astronomical phenomena, next-generation wide-field synoptic surveys are poised to revolutionize our understanding of just about anything that goes bump in the night (which is just about everything at some level). Still, even the most ambitious surveys will require targeted spectroscopic follow-up to fill in the physical details of newly discovered transients. We are now building a new system intended to ingest and classify transient phenomena in near real-time from high-throughput imaging data streams. Described herein, the Transient Classification Project at Berkeley will be making use of classification techniques operating on ``features'' extracted from time series and contextual (static) information. We also highlight the need for a community adoption of a standard representation of astronomical time series data (i.e., ``VOTimeseries'').
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:27:21 GMT" } ]
"2009-06-25T00:00:00"
[ [ "Bloom", "J. S.", "", "UC Berkeley" ], [ "Starr", "D. L.", "", "UCB; Las Cumbres Observatory\n Global Telescope Network" ], [ "Butler", "N. R.", "", "UCB" ], [ "Nugent", "P.", "", "LBL" ], [ "Rischard", "M.", "", "UCB" ], [ "Eads", "D.", "", "UC Santa Cruz; LANL" ], [ "Poznanski", "D.", "", "UCB" ] ]
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802.225
Rafe Mazzeo
Spyridon Alexakis and Rafe Mazzeo
Renormalized area and properly embedded minimal surfaces in hyperbolic 3-manifolds
30 pages; revision includes new section on second variation formula, as well as other minor updates
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
If $Y$ is a properly embedded minimal surface in a convex cocompact hyperbolic 3-manifold $M$ with boundary at infinity an embedded curve $\gamma$, then Graham and Witten showed how to define a renormalized area $\calA$ of $Y$ via Hadamard regularization. We study renormalized area as a functional on the space of all such minimal surfaces. This requires a closer examination of these moduli spaces; following White and Coskunuzer, we prove these are Banach manifolds and that the natural map taking $Y$ to $\gamma$ is Fredholm of index zero and proper, which leads to the existence of a $\ZZ$-valued degree theory for this mapping. We show that $\calA(Y)$ can be expressed as a sum of the Euler characteristic of $Y$ and the total integral of norm squared of the trace-free second fundamental form of $Y$. An extension of renormalized area to a wider class of nonminimal surfaces has a similar formula also involving the integral of mean curvature squared. We prove a formula for the first variation of renormalized area, and characterize the critical points when $M = \HH^3$ and $\gamma$ has a single component. All of these results have analogues for 4-dimensional Poincar\'e-Einstein metrics. We conclude by discussing the relationship of $\calA$ to the Willmore functional.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:25:27 GMT" }, { "version": "v2", "created": "Tue, 9 Sep 2008 16:12:11 GMT" } ]
"2008-09-09T00:00:00"
[ [ "Alexakis", "Spyridon", "" ], [ "Mazzeo", "Rafe", "" ] ]
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802.2251
C T J Dodson
C.T.J. Dodson
A note on quantum chaology and gamma approximations to eigenvalue spacings for infinite random matrices
9 pages, 5 figures, 2 tables, 27 references. Updates version 1 with data and references from feedback received
null
10.1142/9789814271349_0011
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum counterparts of certain simple classical systems can exhibit chaotic behaviour through the statistics of their energy levels and the irregular spectra of chaotic systems are modelled by eigenvalues of infinite random matrices. We use known bounds on the distribution function for eigenvalue spacings for the Gaussian orthogonal ensemble (GOE) of infinite random real symmetric matrices and show that gamma distributions, which have an important uniqueness property, can yield an approximation to the GOE distribution. That has the advantage that then both chaotic and non chaotic cases fit in the information geometric framework of the manifold of gamma distributions, which has been the subject of recent work on neighbourhoods of randomness for general stochastic systems. Additionally, gamma distributions give approximations, to eigenvalue spacings for the Gaussian unitary ensemble (GUE) of infinite random hermitian matrices and for the Gaussian symplectic ensemble (GSE) of infinite random hermitian matrices with real quaternionic elements, except near the origin. Gamma distributions do not precisely model the various analytic systems discussed here, but some features may be useful in studies of qualitative generic properties in applications to data from real systems which manifestly seem to exhibit behaviour reminiscent of near-random processes.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:30:05 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 18:28:45 GMT" } ]
"2016-12-21T00:00:00"
[ [ "Dodson", "C. T. J.", "" ] ]
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802.2252
Tatiana G. Rappoport
Y. T. Xing, H. Micklitz, T. G. Rappoport, M. V. Milo\v{s}evi\'c, I. G. Sol\'orzano-Naranjo and E. Baggio-Saitovitch
Spontaneous vortex phases in ferromagnet-superconductor nanocomposites
5 pages, 4 figures
null
null
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The interplay between superconductivity and magnetism gives rise to many intriguing and exciting phenomena. In this Letter we report about a novel manifestation of this interplay: a temperature induced phase transition between different spontaneous vortex phases in lead superconducting films with embedded magnetic nanoparticles. Unlike common vortices in superconductors the vortex phase appears without any applied magnetic field. The vortices nucleate exclusively due to the stray field of the magnetic nanoparticles, which serve the dual role of providing the internal field and simultaneously acting as pinning centers. As in usual superconductors, one can move the spontaneous vortices with an applied electric current. Transport measurements reveal dynamical phase transitions that depend on temperature (T) and applied field (H) and support the obtained (H-T) phase diagram. In particular, we used a scaling analysis to characterize a transition from a liquid to a novel disordered solid resembling a vortex glass.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:43:59 GMT" }, { "version": "v2", "created": "Mon, 27 Oct 2008 13:48:39 GMT" } ]
"2008-10-27T00:00:00"
[ [ "Xing", "Y. T.", "" ], [ "Micklitz", "H.", "" ], [ "Rappoport", "T. G.", "" ], [ "Milošević", "M. V.", "" ], [ "Solórzano-Naranjo", "I. G.", "" ], [ "Baggio-Saitovitch", "E.", "" ] ]
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802.2253
Richard M. Crutcher
Thomas H. Troland and Richard M. Crutcher
Magnetic Fields in Dark Cloud Cores: Arecibo OH Zeeman Observations
22 pages, 2 figures, 2 tables
null
10.1086/587546
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have carried out an extensive survey of magnetic field strengths toward dark cloud cores in order to test models of star formation: ambipolar-diffusion driven or turbulence driven. The survey involved $\sim500$ hours of observing with the Arecibo telescope in order to make sensitive OH Zeeman observations toward 34 dark cloud cores. Nine new probable detections were achieved at the 2.5-sigma level; the certainty of the detections varies from solid to marginal, so we discuss each probable detection separately. However, our analysis includes all the measurements and does not depend on whether each position has a detection or just a sensitive measurement. Rather, the analysis establishes mean (or median) values over the set of observed cores for relevant astrophysical quantities. The results are that the mass-to-flux ratio is supercritical by $\sim 2$, and that the ratio of turbulent to magnetic energies is also $\sim 2$. These results are compatible with both models of star formation. However, these OH Zeeman observations do establish for the first time on a statistically sound basis the energetic importance of magnetic fields in dark cloud cores at densities of order $10^{3-4}$ cm$^{-3}$, and they lay the foundation for further observations that could provide a more definitive test.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:50:24 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Troland", "Thomas H.", "" ], [ "Crutcher", "Richard M.", "" ] ]
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802.2254
Berndt Muller
R.B. Neufeld, B. M\"uller, J. Ruppert
Sonic Mach Cones Induced by Fast Partons in a Perturbative Quark-Gluon Plasma
Final version accepted for publication
Phys.Rev.C78:041901,2008
10.1103/PhysRevC.78.041901
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the space-time distribution of energy and momentum deposited by a fast parton traversing a weakly coupled quark-gluon plasma by treating the fast part on as the source of an external color field perturbing the medium. We then use our result as a source term for the linearized hydrodynamical equations of the medium. We show that the solution contains a sonic Mach cone and a dissipative wake if the parton moves at a supersonic speed.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:52:44 GMT" }, { "version": "v2", "created": "Sat, 29 Mar 2008 05:08:42 GMT" }, { "version": "v3", "created": "Thu, 17 Apr 2008 20:28:11 GMT" }, { "version": "v4", "created": "Fri, 26 Sep 2008 17:06:38 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Neufeld", "R. B.", "" ], [ "Müller", "B.", "" ], [ "Ruppert", "J.", "" ] ]
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802.2255
Daria Zieminska
D0 Collaboration: V. M. Abazov et al
Measurement of $\boldmath {B_s^0}$ mixing parameters from the flavor-tagged decay
7 pages, 2 figures
Phys.Rev.Lett.101:241801,2008
10.1103/PhysRevLett.101.241801
null
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From an analysis of the flavor-tagged decay \bsdec we obtain the width difference between the $B_s^0$ light and heavy mass eigenstates, $\Delta \Gamma_s \equiv \Gamma_L - \Gamma_H = 0.19 \pm 0.07 {\rm (stat)}\thinspace ^{+0.02}_{-0.01} {\rm (syst)}$ ps$^{-1}$, and the CP-violating phase, $\phi_{s} =-0.57 ^{+0.24}_{-0.30} {\rm (stat)}\thinspace ^{+0.07}_{-0.02} {\rm (syst)}$. The allowed 90% C.L. intervals of $\Delta \Gamma_s$ and $\phi_s$ are $0.06 <\Delta \Gamma_s <0.30$ ps$^{-1}$ and $-1.20 <\phi_s < 0.06$, respectively. The data sample corresponds to an integrated luminosity of 2.8 fb$^{-1}$ accumulated with the D0 detector at the Fermilab Tevatron collider.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:53:12 GMT" } ]
"2009-01-09T00:00:00"
[ [ "D0 Collaboration", "", "" ], [ "al", "V. M. Abazov et", "" ] ]
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802.2256
Ivo Degiovanni
F. A. Bovino, I. P. Degiovanni
Quantum Correlation Bounds for Quantum Information Experiments Optimization: the Wigner Inequality Case
null
null
10.1103/PhysRevA.77.052110
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Violation of modified Wigner inequality by means binary bipartite quantum system allows the discrimination between the quantum world and the classical local-realistic one, and also ensures the security of Ekert-like quantum key distribution protocol. In this paper we study both theoretically and experimentally the bounds of quantum correlation associated to the modified Wigner's inequality finding the optimal experimental configuration for its maximal violation. We also extend this analysis to the implementation of Ekert's protocol.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:54:36 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Bovino", "F. A.", "" ], [ "Degiovanni", "I. P.", "" ] ]
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802.2257
Frederik Denef
Jan de Boer, Frederik Denef, Sheer El-Showk, Ilies Messamah and Dieter Van den Bleeken
Black hole bound states in AdS_3 x S^2
null
JHEP 0811:050,2008
10.1088/1126-6708/2008/11/050
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We systematically construct the geometries dual to the 1+1 dimensional (0,4) conformal field theories that arise in the low-energy description of wrapped M5-branes in S^1 x CY_3 compactifications of M-theory. This includes a large number of multicentered black hole bound states asymptotic to AdS_3 x S^2. In addition, we find many geometries that develop multiple, mutually decoupled AdS_3 x S^2 throats. We argue there is a useful one to one correspondence between the connected components of the space of solutions and particular limits of type IIA attractor flow trees. We point out that there is a thermodynamic instability of small supersymmetric BTZ black holes to localization on the S^2, a supersymmetric and exactly solvable analog of the well known AdS-Schwarzschild localization instability, and identify this with the ``Entropy Enigma'' in four dimensions. We discuss the phase transition this suggests, and initiate the CFT interpretation of these results.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 17:55:58 GMT" } ]
"2014-11-18T00:00:00"
[ [ "de Boer", "Jan", "" ], [ "Denef", "Frederik", "" ], [ "El-Showk", "Sheer", "" ], [ "Messamah", "Ilies", "" ], [ "Bleeken", "Dieter Van den", "" ] ]
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802.2258
Carlos Alberto Fernandez-y-Fernandez
Anthony J. H. Simons, Carlos Alberto Fernandez-y-Fernandez
Using Alloy to model-check visual design notations
8 pages
Simons, A.J.H. and Fernandez-y-Fernandez, C.A., Using Alloy to model-check visual design notations. In Sixth Mexican Int. Conf. on C S, (Mexico, 2005), IEEE, 121-128
10.1109/ENC.2005.52
null
cs.SE cs.SC
null
This paper explores the process of validation for the abstract syntax of a graphical notation. We define an unified specification for five of the UML diagrams used by the Discovery Method and, in this document, we illustrate how diagrams can be represented in Alloy and checked against our specification in order to know if these are valid under the Discovery notation.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:25:50 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Simons", "Anthony J. H.", "" ], [ "Fernandez-y-Fernandez", "Carlos Alberto", "" ] ]
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802.2259
Rachel Rosen
R. Rosen, J. Christopher Clemens
A Quantitative Non-radial Oscillation Model for the Subpulses in PSR B0943+10
45 pages, 16 figures, accepted ApJ
null
10.1086/587476
null
astro-ph
null
In this paper, we analyze time series measurements of PSR B0943+10 and fit them with a non-radial oscillation model. The model we apply was first developed for total intensity measurements in an earlier paper, and expanded to encompass linear polarization in a companion paper to this one. We use PSR B0943+10 for the initial tests of our model because it has a simple geometry, it has been exhaustively studied in the literature, and its behavior is well-documented. As prelude to quantitative fitting, we have reanalyzed previously published archival data of PSR B0943+10 and uncovered subtle but significant behavior that is difficult to explain in the framework of the drifting spark model. Our fits of a non-radial oscillation model are able to successfully reproduce the observed behavior in this pulsar.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:11:56 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Rosen", "R.", "" ], [ "Clemens", "J. Christopher", "" ] ]
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802.226
Steven Spangler
Steven R. Spangler
Plasma Turbulence in the Local Bubble
Submitted to Space Science Reviews as contribution to Proceedings of ISSI (International Space Science Institute) workshop "From the Heliosphere to the Local Bubble". Refereed version accepted for publication
Space Sci.Rev.143:277-290,2009
10.1007/s11214-008-9391-7
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Turbulence in the Local Bubble could play an important role in the thermodynamics of the gas that is there. The best astronomical technique for measuring turbulence in astrophysical plasmas is radio scintillation. Measurements of the level of scattering to the nearby pulsar B0950+08 by Philips and Clegg in 1992 showed a markedly lower value for the line-of-sight averaged turbulent intensity parameter $<C_N^2>$ than is observed for other pulsars, consistent with radio wave propagation through a highly rarefied plasma. In this paper, we discuss the observational progress that has been made since that time. At present, there are four pulsars (B0950+08, B1133+16, J0437-4715, and B0809+74) whose lines of sight seem to lie mainly within the local bubble. The mean densities and line of sight components of the interstellar magnetic field along these lines of sight are smaller than nominal values for pulsars, but not by as much expected. Three of the four pulsars also have measurements of interstellar scintillation. The value of the parameter $<C_N^2>$ is smaller than normal for two of them, but is completely nominal for the third. This inconclusive status of affairs could be improved by measurements and analysis of ``arcs'' in ``secondary spectra'' of pulsars.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:10:47 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 20:52:31 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Spangler", "Steven R.", "" ] ]
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802.2261
Markus Riedle
Markus Riedle
Cylindrical Wiener processes
null
null
null
null
math.PR
null
In this work cylindrical Wiener processes on Banach spaces are defined by means of cylindrical stochastic processes, which are a well considered mathematical object. This approach allows a definition which is a simple straightforward extension of the real-valued situation. We apply this definition to introduce a stochastic integral with respect to cylindrical Wiener processes. Again, this definition is a straightforward extension of the real-valued situation which results now in simple conditions on the integrand. In particular, we do not have to put any geometric constraints on the Banach space under consideration. Finally, we relate this integral to well-known stochastic integrals in literature.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:27:22 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Riedle", "Markus", "" ] ]
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802.2262
Alexander Zhidenko
Alexander Zhidenko
Evolution of Brane-Localised Standard Model Fields in Gauss-Bonnet theory
7 pages, 5 figures, 4 tables
Phys.Rev.D78:024007,2008
10.1103/PhysRevD.78.024007
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the massless scalar, Dirac and electro-magnetic fields propagating on a 4D-brane, which is embedded in higher dimensional Gauss-Bonnet space-time. We calculate, in time-domain, the fundamental quasi-normal modes of a spherically symmetric black hole for such fields. We observe also a universal behavior, independent on a field and value of the Gauss-Bonnet parameter, at asymptotically late time.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:15:47 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 18:19:21 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Zhidenko", "Alexander", "" ] ]
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802.2263
Akira SaiToh
Akira SaiToh, Robabeh Rahimi, and Mikio Nakahara
Mathematical framework for detection and quantification of nonclassical correlation
14 pages, no figure, v1-v2: 4 pages, v2: a proposition and a proof corrected, v3: 6 pages, more details of proofs written, an explanation of a measure corrected, v4: 15 pages, a new nonlinear EnCE map introduced, v5: 15 pages, typos corrected, v6: 18 pages, an inconsistent remark removed, v7: 19 pages, minor changes in presentation, v8-v10: 14 pages, minor revisions, to appear in QIC
Quantum Inf. Comput. 11, 0167-0180 (2011)
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Existing measures of bipartite nonclassical correlation that is typically characterized by nonvanishing nonlocalizable information under the zero-way CLOCC protocol are expensive in computational cost. We define and evaluate economical measures on the basis of a new class of maps, eigenvalue-preserving-but-not-completely-eigenvalue-preserving (EnCE) maps. The class is in analogy to the class of positive-but-not-completely-positive (PnCP) maps that have been commonly used in the entanglement theories. Linear and nonlinear EnCE maps are investigated. We also prove subadditivity of the measures in a form of logarithmic fidelity.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:23:10 GMT" }, { "version": "v10", "created": "Tue, 9 Nov 2010 10:11:38 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 03:04:58 GMT" }, { "version": "v3", "created": "Thu, 9 Oct 2008 05:51:54 GMT" }, { "version": "v4", "created": "Mon, 22 Jun 2009 13:01:50 GMT" }, { "version": "v5", "created": "Tue, 7 Jul 2009 06:16:23 GMT" }, { "version": "v6", "created": "Mon, 8 Feb 2010 14:19:23 GMT" }, { "version": "v7", "created": "Tue, 9 Feb 2010 11:54:54 GMT" }, { "version": "v8", "created": "Sun, 10 Oct 2010 07:47:43 GMT" }, { "version": "v9", "created": "Fri, 15 Oct 2010 07:53:52 GMT" } ]
"2010-11-10T00:00:00"
[ [ "SaiToh", "Akira", "" ], [ "Rahimi", "Robabeh", "" ], [ "Nakahara", "Mikio", "" ] ]
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802.2264
Werner Sun
The CLEO Collaboration: J. L. Rosner, et al
Determination of the Strong Phase in D0 -> K+pi- Using Quantum-Correlated Measurements
5 pages, also available through http://www.lns.cornell.edu/public/CLNS/2007/. Incorporated referees' comments
Phys.Rev.Lett.100:221801,2008
10.1103/PhysRevLett.100.221801
CLNS 07/2013, CLEO 07-17
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We exploit the quantum coherence between pair-produced D0 and D0bar in psi(3770) decays to study charm mixing, which is characterized by the parameters x and y, and to make a first determination of the relative strong phase \delta between D0 -> K+pi- and D0bar -> K+pi-. Using 281 pb^-1 of e^+e^- collision data collected with the CLEO-c detector at E_cm = 3.77 GeV, as well as branching fraction input and time-integrated measurements of R_M = (x^2+y^2)/2 and R_{WS} = Gamma(D0 -> K+pi-)/Gamma(D0bar -> K+pi-) from other experiments, we find \cos\delta = 1.03 +0.31-0.17 +- 0.06, where the uncertainties are statistical and systematic, respectively. By further including other mixing parameter measurements, we obtain an alternate measurement of \cos\delta = 1.10 +- 0.35 +- 0.07, as well as x\sin\delta = (4.4 +2.7-1.8 +- 2.9) x 10^-3 and \delta = 22 +11-12 +9-11 degrees.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:57:48 GMT" }, { "version": "v2", "created": "Wed, 5 Aug 2009 03:43:19 GMT" } ]
"2010-04-08T00:00:00"
[ [ "The CLEO Collaboration", "", "" ], [ "Rosner", "J. L.", "" ] ]
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802.2265
Piero Madau
Piero Madau, Juerg Diemand, and Michael Kuhlen
Dark matter subhalos and the dwarf satellites of the Milky Way
14 pages, 8 figures, ApJ in press. A few typos corrected
null
10.1086/587545
null
astro-ph
null
The Via Lactea simulation of the dark matter halo of the Milky Way predicts the existence of many thousands of bound subhalos distributed approximately with equal mass per decade of mass. Here we show that: a) a similar steeply rising subhalo mass function is also present at redshift 0.5 in an elliptical-sized halo simulated with comparable resolution in a different cosmology. Compared to Via Lactea, this run produces nearly a factor of two more subhalos with large circular velocities; b) the fraction of Via Lactea mass brought in by subhalos that have a surviving bound remnant today with present-day peak circular velocity Vmax>2 km/s (>10 km/s) is 45% (30%); c) because of tidal mass loss, the number of subhalos surviving today that reached a peak circular velocity of >10 km/s throughout their lifetime exceeds half a thousand, five times larger than their present-day abundance and more than twenty times larger than the number of known satellites of the Milky Way; e) unless the circular velocity profiles of Galactic satellites peak at values significantly higher that expected from the stellar line-of-sight velocity dispersion, only about one in five subhalos with Vmax>20 km/s today must be housing a luminous dwarf; f) small dark matter clumps appear to be relatively inefficient at forming stars even well beyond the virial radius; g) the observed Milky Way satellites appear to follow the overall dark matter distribution of Via Lactea, while the largest simulated subhalos today are found preferentially at larger radii; h) subhalos have central densities that increase with Vmax and reach 0.1-0.3 Msun/pc3 comparable to the central densities inferred in dwarf spheroidals with core radii >250 pc.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:51:16 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 23:25:25 GMT" }, { "version": "v3", "created": "Thu, 21 Feb 2008 22:28:55 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Madau", "Piero", "" ], [ "Diemand", "Juerg", "" ], [ "Kuhlen", "Michael", "" ] ]
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802.2266
Barry Holstein
Barry R. Holstein
Long Range Electromagnetic Effects involving Neutral Systems and Effective Field Theory
23 pages, 3 .eps figures
Phys.Rev.D78:013001,2008
10.1103/PhysRevD.78.013001
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the electromagnetic scattering of massive particles with and without spin wherein one particle (or both) is electrically neutral. Using the techniques of effective field theory, we isolate the leading long distance effects, both classical and quantum mechanical. For spinless systems results are identical to those obtained earlier via more elaborate dispersive methods. However, we also find new results if either or both particles carry apin.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:45:34 GMT" } ]
"2010-03-25T00:00:00"
[ [ "Holstein", "Barry R.", "" ] ]
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802.2267
Petr Khomyakov A.
G. Giovannetti, P. A. Khomyakov, G. Brocks, V. M. Karpan, J. van den Brink, and P. J. Kelly
Doping graphene with metal contacts
4 pages, 5 figures
Phys. Rev. Lett. 101, 026803 (2008)
10.1103/PhysRevLett.101.026803
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Making devices with graphene necessarily involves making contacts with metals. We use density functional theory to study how graphene is doped by adsorption on metal substrates and find that weak bonding on Al, Ag, Cu, Au and Pt, while preserving its unique electronic structure, can still shift the Fermi level with respect to the conical point by $\sim 0.5$ eV. At equilibrium separations, the crossover from $p$-type to $n$-type doping occurs for a metal work function of $\sim 5.4$ eV, a value much larger than the graphene work function of 4.5 eV. The numerical results for the Fermi level shift in graphene are described very well by a simple analytical model which characterizes the metal solely in terms of its work function, greatly extending their applicability.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:06:44 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 20:31:16 GMT" }, { "version": "v3", "created": "Wed, 23 Jul 2008 13:28:03 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Giovannetti", "G.", "" ], [ "Khomyakov", "P. A.", "" ], [ "Brocks", "G.", "" ], [ "Karpan", "V. M.", "" ], [ "Brink", "J. van den", "" ], [ "Kelly", "P. J.", "" ] ]
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802.2268
Werner Sun
The CLEO Collaboration: D. M. Asner, et al
Determination of the D0 -> K+pi- Relative Strong Phase Using Quantum-Correlated Measurements in e+e- -> D0 D0bar at CLEO
37 pages, also available through http://www.lns.cornell.edu/public/CLNS/2007/. Incorporated referee's comments
Phys.Rev.D78:012001,2008
10.1103/PhysRevD.78.012001
CLNS 07/2014, CLEO 07-18
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We exploit the quantum coherence between pair-produced D0 and D0bar in psi(3770) decays to study charm mixing, which is characterized by the parameters x and y, and to make a first determination of the relative strong phase \delta between doubly Cabibbo-suppressed D0 -> K+pi- and Cabibbo-favored D0bar -> K+pi-. We analyze a sample of 1.0 million D0D0bar pairs from 281 pb^-1 of e+e- collision data collected with the CLEO-c detector at E_cm = 3.77 GeV. By combining CLEO-c measurements with branching fraction input and time-integrated measurements of R_M = (x^2+y^2)/2 and R_{WS} = Gamma(D0 -> K+pi-)/Gamma(D0bar -> K+pi-) from other experiments, we find \cos\delta = 1.03 +0.31-0.17 +- 0.06, where the uncertainties are statistical and systematic, respectively. In addition, by further including external measurements of charm mixing parameters, we obtain an alternate measurement of \cos\delta = 1.10 +- 0.35 +- 0.07, as well as x\sin\delta = (4.4 +2.7-1.8 +- 2.9) x 10^-3 and \delta = 22 +11-12 +9-11 degrees.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:53:26 GMT" }, { "version": "v2", "created": "Wed, 5 Aug 2009 03:56:49 GMT" } ]
"2009-08-05T00:00:00"
[ [ "The CLEO Collaboration", "", "" ], [ "Asner", "D. M.", "" ] ]
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802.2269
Ol'khov
O. A. Olkhov
On possibility of topological interpretation of quantum mechanics
27 pages
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Geometrical model for quantum objects is suggested. It is shown that equations for free material Dirac field and for Maxwell electromagnetic field can be considered as relations describing propagation of the space topological defects. This interpretation explains irrational properties of quantum objects such as wave-corpuscular duality, stochastic behavior, instantaneous nonlocal correlation in EPR-paradox, the light velocity invariance and so on. It is shown also that Dirac equation for hydrogen atom can be also considered as relation describing the space topological defect. Electromagnetic potentials appears within this approach as connectivities of the defect universal covering space and gauge invariance of electromagnetic field happens to be a natural consequence of topological interpretation. Proposed approach can be also considered as a nonlocal model with hidden variables. Preliminary results were published by parts early, and here they are presented completely.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 18:56:54 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Olkhov", "O. A.", "" ] ]
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802.227
Alan Sokal
Roman Kotecky, Jesus Salas and Alan D. Sokal
Phase transition in the 3-state Potts antiferromagnet on the diced lattice
4 pages, LaTeX2e/revtex4, includes 4 figures. Version 3 (published in PRL) contains several small improvements in response to referees' comments
Phys. Rev. Lett. 101, 030601 (2008)
10.1103/PhysRevLett.101.030601
null
cond-mat.stat-mech hep-lat math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the 3-state Potts antiferromagnet on the diced lattice (dual of the kagome lattice) has entropically-driven long-range order at low temperatures (including zero). We then present Monte Carlo simulations, using a cluster algorithm, of the 3-state and 4-state models. The 3-state model has a phase transition to the high-temperature disordered phase at v = e^J - 1 = -0.860599 +- 0.000004 that appears to be in the universality class of the 3-state Potts ferromagnet. The 4-state model is disordered throughout the physical region, including at zero temperature.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 20:55:12 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 21:19:38 GMT" }, { "version": "v3", "created": "Mon, 20 Apr 2009 14:20:01 GMT" } ]
"2009-04-20T00:00:00"
[ [ "Kotecky", "Roman", "" ], [ "Salas", "Jesus", "" ], [ "Sokal", "Alan D.", "" ] ]
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802.2271
Vasily Ogryzko V
Vasily Ogryzko
Quantum approach to adaptive mutations. Didactic introduction
29 pages, 16 figures
null
null
null
q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A didactic introduction, dated by 1999, to the ideas of the papers arXiv:q-bio/0701050 and arXiv:0704.0034
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:25:34 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Ogryzko", "Vasily", "" ] ]
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802.2272
Mahesh Kakde Mr.
Mahesh Kakde
Proof of the Main Conjecture of Noncommutative Iwasawa Theory for Totally Real Number Fields in Certain Cases
49 pages
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fix an odd prime $p$. Let $G$ be a compact $p$-adic Lie group containing a closed, normal, pro-$p$ subgroup $H$ which is abelian and such that $G/H$ is isomorphic to the additive group of $p$-adic integers $\mathbbZ_p$ . First we assume that $H$ is finite and compute the Whitehead group of the Iwasawa algebra, $\Lambda(G)$, of $G$. We also prove some results about certain localisation of $\Lambda(G)$ needed in Iwasawa theory. Let $F$ be a totally real number field and let $F_{\infty}$ be an admissible $p$-adic Lie extension of $F$ with Galois group $G$. The computation of the Whitehead groups are used to show that the Main Conjecture for the extension $F_{\infty}/F$ can be deduced from certain congruences between abelian $p$-adic zeta functions of Delige and Ribet. We prove these congruences with certain assumptions on $G$. This gives a proof of the Main Conjecture in many interesting cases such as $\mathbb{Z}_p\rtimes
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:40:37 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 09:13:06 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Kakde", "Mahesh", "" ] ]
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802.2273
Anthony Remijan
Anthony. J. Remijan (NRAO) Diane P. Leigh (NRAO) A. J. Markwick-Kemper (University of Manchester) B. E. Turner (NRAO)
Complete 2mm Spectral Line Survey (130-170 GHz) of Sgr B2N, Sgr B2OH, IRC +10 216, Orion (KL), Orion-S, W51M, and W3(IRS5)
22 pages, 6 figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a complete 2mm spectral line survey (130-170 GHz) taken with the NRAO 12m Telescope between 1993 and 1995 toward the following sources: Sgr B2N, Sgr B2OH, IRC +10 216, Orion (KL), Orion-S, W51M, and W3(IRS5). Until very recently, this project was entirely the work of B. E. Turner. He wrote the original proposal, given below without changes or updates, and did all of the observing. B.E. Turner has fallen seriously ill and can no longer continue to work on the analysis of these data. The notes that follow the proposal give further information about the project and important information for users of these data. The data are distributed using the Spectral Line Search Engine (SLiSE) developed by A. J. Remijan and M. J. Remijan. SLiSE is a data display tool that will contain all the fully reduced and calibrated archived data taken as part of this 2mm survey. SLiSE is fast, easy to use, and contains the necessary functionality to display the data taken from spectral line searches. For example, SLiSE contains functions to overlay possible molecule identifications based on a current line catalog as well as overlaying H and He recombination lines. It is a Java-based applet, so it is platform independent and easily accessed online. The only caveat is that SLiSE was built using Java 1.5, so an update to the user's Java may be necessary. We request users of these data to give B.E. Turner and this work the appropriate citation and credit.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:45:39 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Remijan", "Anthony. J.", "", "NRAO" ], [ "Leigh", "Diane P.", "", "NRAO" ], [ "Markwick-Kemper", "A. J.", "", "University of Manchester" ], [ "Turner", "B. E.", "", "NRAO" ] ]
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802.2274
Robert Oeckl
Daniele Colosi (UNAM), Robert Oeckl (UNAM)
Spatially asymptotic S-matrix from general boundary formulation
27 pages, LaTeX + revtex4; v2: various corrections, references updated
Phys.Rev.D78:025020,2008
10.1103/PhysRevD.78.025020
UNAM-IM-MOR-2008-1
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a new type of S-matrix in quantum field theory using the general boundary formulation. In contrast to the usual S-matrix the space of free asymptotic states is located at spatial rather than at temporal infinity. Hence, the new S-matrix applies to situations where interactions may remain important at all times, but become negligible with distance. We show that the new S-matrix is equivalent to the usual one in situations where both apply. This equivalence is mediated by an isomorphism between the respective asymptotic state spaces that we construct. We introduce coherent states that allow us to obtain explicit expressions for the new S-matrix. In our formalism crossing symmetry becomes a manifest rather than a derived feature of the S-matrix.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:46:42 GMT" }, { "version": "v2", "created": "Wed, 16 Jul 2008 20:58:53 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Colosi", "Daniele", "", "UNAM" ], [ "Oeckl", "Robert", "", "UNAM" ] ]
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802.2275
David Callan
David Callan
Pattern avoidance in "flattened" partitions
8 pages
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To flatten a set partition (with apologies to Mathematica) means to form a permutation by erasing the dividers between its blocks. Of course, the result depends on how the blocks are listed. For the usual listing--increasing entries in each block and blocks arranged in increasing order of their first entries--we count the partitions of [n] whose flattening avoids a single 3-letter pattern. Five counting sequences arise: a null sequence, the powers of 2, the Fibonacci numbers, the Catalan numbers, and the binomial transform of the Catalan numbers.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:47:37 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Callan", "David", "" ] ]
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802.2276
B. Svaiter F.
M.Marques Alves, B. F. Svaiter
Fixed Points of Generalized Conjugations
14 pages
null
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Conjugation, or Legendre transformation, is a basic tool in convex analysis, rational mechanics, economics and optimization. It maps a function on a linear topological space into another one, defined in the dual of the linear space by coupling these space by meas of the duality product. Generalized conjugation extends classical conjugation to any pair of domains, using an arbitrary coupling function between these spaces. This generalization of conjugation is now being widely used in optima transportation problems, variational analysis and also optimization. If the coupled spaces are equal, generalized conjugations define order reversing maps of a family of functions into itself. In this case, is natural to ask for the existence of fixed points of the conjugation, that is, functions which are equal to their (generalized) conjugateds. Here we prove that any generalized symmetric conjugation has fixed points. The basic tool of the proof is a variational principle involving the order reversing feature of the conjugation. As an application of this abstract result, we will extend to real linear topological spaces a fixed-point theorem for Fitzpatrick's functions, previously proved in Banach spaces.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 19:52:39 GMT" } ]
"2008-02-18T00:00:00"
[ [ "Alves", "M. Marques", "" ], [ "Svaiter", "B. F.", "" ] ]
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802.2277
Motoyuki Saijo
Motoyuki Saijo, Yasufumi Kojima
Faraday resonance in dynamical bar instability of differentially rotating stars
13 pages with 13 figures, revtex4.cls. Accepted for publication in the Physical Review D
Phys.Rev.D77:063002,2008
10.1103/PhysRevD.77.063002
null
astro-ph gr-qc
null
We investigate the nonlinear behaviour of the dynamically unstable rotating star for the bar mode by three-dimensional hydrodynamics in Newtonian gravity. We find that an oscillation along the rotation axis is induced throughout the growth of the unstable bar mode, and that its characteristic frequency is twice as that of the bar mode, which oscillates mainly along the equatorial plane. A possibility to observe Faraday resonance in gravitational waves is demonstrated and discussed.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 20:45:02 GMT" } ]
"2008-03-13T00:00:00"
[ [ "Saijo", "Motoyuki", "" ], [ "Kojima", "Yasufumi", "" ] ]
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802.2278
Gary Varner
Gary S. Varner, Larry L. Ruckman and Andrew Wong
The first version Buffered Large Analog Bandwidth (BLAB1) ASIC for high luminosity collider and extensive radio neutrino detectors
15 pages, 26 figures; revised, accepted for publication in NIM A
Nucl.Instrum.Meth.A591:534-545,2008
10.1016/j.nima.2008.03.095
null
physics.ins-det
null
Future detectors for high luminosity particle identification and ultra high energy neutrino observation would benefit from a digitizer capable of recording sensor elements with high analog bandwidth and large record depth, in a cost-effective, compact and low-power way. A first version of the Buffered Large Analog Bandwidth (BLAB1) ASIC has been designed based upon the lessons learned from the development of the Large Analog Bandwidth Recorder and Digitizer with Ordered Readout (LABRADOR) ASIC. While this LABRADOR ASIC has been very successful and forms the basis of a generation of new, large-scale radio neutrino detectors, its limited sampling depth is a major drawback. A prototype has been designed and fabricated with 65k deep sampling at multi-GSa/s operation. We present test results and directions for future evolution of this sampling technique.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 20:56:35 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 03:31:54 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Varner", "Gary S.", "" ], [ "Ruckman", "Larry L.", "" ], [ "Wong", "Andrew", "" ] ]
[ -0.0878769159, 0.0012150046, -0.033432737, 0.0230617039, -0.0215651616, -0.0158184431, -0.0454649292, 0.0101764817, 0.0036796213, -0.0814717188, 0.0613581985, -0.088295944, -0.0834471509, -0.0216250233, 0.0706367567, -0.0205175839, 0.0273867082, 0.0125634661, -0.0291376617, -0.0502239317, -0.0051256544, -0.0007010361, -0.0100268275, -0.0568685755, 0.0367550589, -0.1817400008, 0.0754855499, -0.0725523308, 0.051151786, -0.0307090301, -0.02108627, -0.0675239488, -0.0893734545, -0.0088221123, -0.1035606712, 0.0610588938, 0.0708762035, 0.0066371616, -0.0513613038, -0.0038105687, 0.0033653476, -0.1133779809, 0.0475002266, 0.0577665009, -0.0101241032, 0.0682422891, -0.0503137223, 0.0530673601, -0.074886933, 0.0164020937, -0.0605500676, 0.0759045854, -0.0871585757, 0.0256656855, 0.0247378312, 0.0061096307, -0.0288383532, 0.0358272046, -0.0674042255, 0.0339116305, -0.0608793087, -0.0221937094, 0.0338517688, -0.0648900345, -0.0731509477, -0.0038311461, -0.0580957383, 0.0911094472, 0.0068803495, -0.0035711222, 0.0838661864, -0.0582753234, -0.0012019099, 0.032654535, -0.0172700882, -0.0210413728, 0.0207420643, 0.0171802957, -0.051151786, 0.1078707054, -0.0372638814, 0.0149878627, -0.0475301556, -0.0599813834, 0.0401372425, -0.0434595644, -0.0101839649, -0.0575569831, -0.0769222304, 0.1006274447, 0.0366951972, -0.0569284372, 0.0060460274, 0.165577352, 0.0433099084, -0.006281733, 0.0052491194, 0.0081636338, 0.1166703701, 0.0531571545, 0.0142321093, -0.0430106036, 0.0620166771, -0.0780596063, -0.0282846335, -0.1038599759, 0.0046093478, -0.0036534318, -0.0447765216, -0.0016658377, -0.0405862033, -0.1148745269, -0.1189451143, 0.02235833, 0.0469016097, -0.1054762453, -0.0955990702, 0.0129376007, 0.0522592291, 0.0533966012, -0.0456145853, 0.1504922062, 0.0744080395, -0.0620166771, 0.0014946708, -0.0395086966, 0.082788676, -0.1521683335, -0.0367849879, -0.0779997408, 0.1211600006, -0.0833872929, 0.078299053, -0.0402868949, -0.0213257167, 0.0219841935, -0.0939229429, -0.0026039821, -0.0110145453, -0.1039796993, 0.1102053151, 0.035198655, 0.0975146443, -0.0036683972, -0.0055147554, 0.0440581813, -0.0865000933, 0.0270574689, 0.0278207064, 0.0472907089, -0.0338517688, -0.0092037302, -0.0205325484, -0.0784187764, 0.0035243551, -0.0511817187, 0.0807533786, 0.0383713245, -0.1279842257, -0.08434508, 0.0765630603, 0.0310083386, -0.0253514126, 0.0989513248, 0.0605500676, 0.0571978167, -0.07584472, -0.0278805681, -0.1745565981, -0.0040743342, -0.0495355241, 0.0082908394, -0.0123913633, -0.1095468327, -0.0231066011, -0.0647104532, 0.0495953858, -0.0891340077, -0.0586644262, -0.0540850088, 0.0249473471, -0.0407059267, 0.1336112171, 0.0233759768, -0.0345102474, -0.045854032, 0.0069738831, 0.0228671543, 0.0078343945, -0.0569583699, -0.0249024499, 0.1229558438, 0.0627948791, 0.0759644434, 0.0382516012, -0.029466901, 0.0696789697, 0.0245133489, 0.1008070335, -0.0769820958, 0.0179584976, 0.0736298412, 0.0467818864, -0.017584363, 0.011777781, -0.0268778857, 0.071295239, 0.0424419157, 0.0891340077, -0.0575869158, 0.0460336171, 0.0197693128, 0.0832077041, -0.0248725191, -0.1263080984, 0.0024300092, -0.0563298203, 0.1130786762, 0.0232113581, -0.0540550761, -0.0706966221, 0.086320512, -0.0037076815, 0.1136174276, -0.0392093882, 0.0792568326, 0.0191856623, 0.0007632361, 0.0694993883, -0.0635730848, 0.0248126574, 0.0636928082, -0.0220889524, 0.0134389428, 0.0004742166, 0.0681225657, 0.0523789525, -0.055581551, 0.0500443466, -0.0955990702, -0.0894931778, -0.0082309777, -0.0458240993, -0.0106703406, -0.0766229257, 0.0212508887, -0.0348993465, -0.0899720713, 0.0940426663, 0.0762637556, -0.087278299, -0.0237052161, -0.0838661864, -0.0595623516, -0.0167911947, 0.0906305537 ]
802.2279
Eric Murphy
E.J. Murphy, G. Helou, J.D.P. Kenney, L. Armus, and R. Braun
Learning about the Recent Star Formation History of Galaxy Disks by Comparing their Far-Infrared and Radio Morphologies: Cosmic-Ray Electron Diffusion after Star Formation Episodes
8 pages, 2 Figures; To appear in the proceeding from "The Evolving ISM in the Milky Way and Nearby Galaxies"
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present results on the interstellar medium (ISM) properties of 29 galaxies based on a comparison of {\it Spitzer} far-infrared and Westerbork Synthesis Radio Telescope radio continuum imagery. Of these 29 galaxies, 18 are close enough to resolve at $\la$1 kpc scales at 70 $\micron$ and 22 cm. We extend the \citet{ejm06a,ejm06b} approach of smoothing infrared images to approximate cosmic-ray (CR) electron spreading and thus largely reproduce the appearance of radio images. Using a wavelet analysis we decompose each 70 $\micron$ image into one component containing the star-forming {\it structures} and a second one for the diffuse {\it disk}. The components are smoothed separately, and their combination compared to a free-free corrected 22 cm radio image; the scale-lengths are then varied to best match the radio and smoothed infrared images. We find that late-type spirals having high amounts of ongoing star formation benefit most from the two-component method. We also find that the disk component dominates for galaxies having low star formation activity, whereas the structure component dominates at high star formation activity. We propose that this result arises from an age effect rather than from differences in CR electron diffusion due to varying ISM parameters. The bulk of the CR electron population in actively star-forming galaxies is significantly younger than that in less active galaxies due to recent episodes of enhanced star formation; these galaxies are observed within $\sim10^{8}$ yr since the onset of the most recent star formation episode. The sample irregulars have anomalously low best-fit scale-lengths for their surface brightnesses compared to the rest of the sample spirals which we attribute to enhanced CR electron escape.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:00:09 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Murphy", "E. J.", "" ], [ "Helou", "G.", "" ], [ "Kenney", "J. D. P.", "" ], [ "Armus", "L.", "" ], [ "Braun", "R.", "" ] ]
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802.228
Bertrand Duplantier
Bertrand Duplantier and Ilia Binder
Harmonic measure and winding of random conformal paths: A Coulomb gas perspective
29 pages, 4 figures
Nuclear Physics B, Volume 802, Issue 3, 21 October 2008, Pages 494-513
10.1016/j.nuclphysb.2008.05.020
null
cond-mat.stat-mech math-ph math.MP math.PR
null
We consider random conformally invariant paths in the complex plane (SLEs). Using the Coulomb gas method in conformal field theory, we rederive the mixed multifractal exponents associated with both the harmonic measure and winding (rotation or monodromy) near such critical curves, previously obtained by quantum gravity methods. The results also extend to the general cases of harmonic measure moments and winding of multiple paths in a star configuration.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 20:43:38 GMT" } ]
"2009-06-10T00:00:00"
[ [ "Duplantier", "Bertrand", "" ], [ "Binder", "Ilia", "" ] ]
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802.2281
Eric Murphy
E.J. Murphy, J.D.P. Kenney, G. Helou, A. Chung, and J.H. Howell
How the Intracluster Medium Affects the Far-Infrared--Radio Correlation within Virgo Cluster Galaxies
9 pages, 3 figures; To appear in the proceeding from "The Evolving ISM in the Milky Way and Nearby Galaxies"
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a study on the effects of the intracluster medium (ICM) on the interstellar medium (ISM) of 10 Virgo cluster galaxies using {\it Spitzer} far-infrared (FIR) and VLA radio continuum imaging. Relying on the FIR-radio correlation {\it within} normal galaxies, we use our infrared data to create model radio maps which we compare to the observed radio images. For 6 of our sample galaxies we find regions along their outer edges that are highly deficient in the radio compared with our models. We believe these observations are the signatures of ICM ram pressure. For NGC 4522 we find the radio deficit region to lie just exterior to a region of high radio polarization and flat radio spectral index, however the total radio continuum in this region does not appear significantly enhanced. This scenario seems consistent for other galaxies with radio polarization data in the literature. We also find that galaxies having local radio deficits appear to have enhanced global radio fluxes. Our preferred physical picture is that the observed radio deficit regions arise from the ICM wind sweeping away cosmic-ray (CR) electrons and the associated magnetic field, thereby creating synchrotron tails observed for some of our galaxies. CR particles are also re-accelerated by ICM-driven shocklets behind the observed radio deficit regions which in turn enhances the remaining radio disk brightness. The high radio polarization and lack of coincidental signatures in the total synchrotron power in these regions arises from shear, and possibly mild compression, as the ICM wind drags and stretches the magnetic field.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:00:19 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Murphy", "E. J.", "" ], [ "Kenney", "J. D. P.", "" ], [ "Helou", "G.", "" ], [ "Chung", "A.", "" ], [ "Howell", "J. H.", "" ] ]
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802.2282
Rose A. Finn
Rose A. Finn (Siena College), Michael L. Balogh (U. Waterloo), Dennis Zaritsky (U. Arizona), Christopher J. Miller (CTIO), Robert C. Nichol (U. Portsmouth)
Mass and Redshift Dependence of Star Formation in Relaxed Galaxy Clusters
15 pages; 13 figures; accepted for publication in the Astrophysical Journal
null
10.1086/529402
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the star-formation properties of dynamically relaxed galaxy clusters as a function of cluster mass for 308 low-redshift clusters drawn from the Sloan Digital Sky Survey (SDSS) C4 cluster catalog. It is important to establish if cluster star-formation properties have a mass dependence before comparing clusters at different epochs, and here we use cluster velocity dispersion as a measure of cluster mass. We find that the total stellar mass, the number of star-forming galaxies, and total star-formation rate scale linearly with the number of member galaxies, with no residual dependence on cluster velocity dispersion. With the mass-dependence of cluster star-formation rates established, we compare the SDSS clusters with a sample of z = 0.75 clusters from the literature and find that on average the total H-alpha luminosity of the high-redshift clusters is 10 times greater than that of the low-redshift clusters. This can be explained by a decline in the H-alpha luminosities of individual cluster galaxies by a factor of up to 10 since z = 0.75. The magnitude of this evolution is comparable to that of field galaxies over a similar redshift interval, and thus the effect of the cluster environment on the evolution of star-forming galaxies is at most modest. Our results suggest that the physical mechanism driving the evolution of cluster star-formation rates is independent of cluster mass, at least for clusters with velocity dispersion greater than 450 km/s, and operates over a fairly long timescale such that the star-formation rates of individual galaxies decline by an order of magnitude over ~7 billion years. (Abridged)
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:01:10 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Finn", "Rose A.", "", "Siena College" ], [ "Balogh", "Michael L.", "", "U. Waterloo" ], [ "Zaritsky", "Dennis", "", "U. Arizona" ], [ "Miller", "Christopher J.", "", "CTIO" ], [ "Nichol", "Robert C.", "", "U.\n Portsmouth" ] ]
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802.2283
Michael Eisermann
Michael Eisermann, Christoph Lamm
A refined Jones polynomial for symmetric unions
28 pages; v2: some improvements and corrections suggested by the referee
null
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by the study of ribbon knots we explore symmetric unions, a beautiful construction introduced by Kinoshita and Terasaka in 1957. For symmetric diagrams we develop a two-variable refinement $W_D(s,t)$ of the Jones polynomial that is invariant under symmetric Reidemeister moves. Here the two variables $s$ and $t$ are associated to the two types of crossings, respectively on and off the symmetry axis. From sample calculations we deduce that a ribbon knot can have essentially distinct symmetric union presentations even if the partial knots are the same. If $D$ is a symmetric union diagram representing a ribbon knot $K$, then the polynomial $W_D(s,t)$ nicely reflects the geometric properties of $K$. In particular it elucidates the connection between the Jones polynomials of $K$ and its partial knots $K_\pm$: we obtain $W_D(t,t) = V_K(t)$ and $W_D(-1,t) = V_{K_-}(t) \cdot V_{K_+}(t)$, which has the form of a symmetric product $f(t) \cdot f(t^{-1})$ reminiscent of the Alexander polynomial of ribbon knots.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 22:44:29 GMT" }, { "version": "v2", "created": "Wed, 14 Oct 2009 07:52:03 GMT" } ]
"2009-10-14T00:00:00"
[ [ "Eisermann", "Michael", "" ], [ "Lamm", "Christoph", "" ] ]
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802.2284
Jerzy Stelmach
Izabela Jakacka and Jerzy Stelmach
Non-homogeneity-driven Universe acceleration
21 pages, 7 figures, corrected version of the paper published in Class. Quantum Grav. 18 (2001) 2643-2658
Class.Quant.Grav.18:2643-2658,2001
10.1088/0264-9381/18/14/303
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Class of spherically symmetric Stephani cosmological models is examined in the context of evolution type. It is assumed that the equation of state at the symmetry center of the models is barotropic. Classification of cosmological models is performed depending on different values and signs of two free parameters. It is shown that for (hyperbolic geometry) dust-like cosmological model exhibits accelerated expansion at later stages of evolution. The Hubble and deceleration parameters are defined in the model and it is shown that the deceleration parameter decreases with the distance becoming negative for sufficiently distant galaxies. Redshift-magnitude relation is calculated and discussed in the context of SnIa observational data. It is noticed that the most distant supernovae of type Ia fit quite well to the redshift-magnitude relation calculated in the considered model without introducing the cosmological constant. It is also shown that the age of the universe in the model is longer than in the Friedmann model corresponding to the same Hubble and energy density parameters.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:05:51 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Jakacka", "Izabela", "" ], [ "Stelmach", "Jerzy", "" ] ]
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802.2285
Wesley C. Fraser
W. C. Fraser, JJ Kavelaars, M. J. Holman, C. J. Pritchet, B. J Gladman, T. Grav, R. L. Jones, J. MacWilliams, J.-M. Petit
The Kuiper Belt Luminosity Function from m(R)=21 to 26
50 Pages, 8 Figures
null
10.1016/j.icarus.2008.01.014
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have performed an ecliptic imaging survey of the Kuiper belt with our deepest and widest field achieving a limiting flux of m(g') = 26.4, with a sky coverage of 3.0 square-degrees. This is the largest coverage of any other Kuiper belt survey to this depth. We detect 72 objects, two of which have been previously observed. We have improved the Bayesian maximum likelihood fitting technique presented in Gladman et al. (1998) to account for calibration and sky density variations and have used this to determine the luminosity function of the Kuiper belt. Combining our detections with previous surveys, we find the luminosity function is well represented by a single power-law with slope alpha = 0.65 +/- 0.05 and an on ecliptic sky density of 1 object per square-degree brighter than m(R)=23.42 +/- 0.13. Assuming constant albedos, this slope suggests a differential size-distribution slope of 4.25 +/- 0.25, which is steeper than the Dohnanyi slope of 3.5 expected if the belt is in a state of collisional equilibrium. We find no evidence for a roll-over or knee in the luminosity function and reject such models brightward of m(R) ~ 24.6.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 19:42:04 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Fraser", "W. C.", "" ], [ "Kavelaars", "JJ", "" ], [ "Holman", "M. J.", "" ], [ "Pritchet", "C. J.", "" ], [ "Gladman", "B. J", "" ], [ "Grav", "T.", "" ], [ "Jones", "R. L.", "" ], [ "MacWilliams", "J.", "" ], [ "Petit", "J. -M.", "" ] ]
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802.2286
Daniel Grumiller
P. Castorina, D. Grumiller and A. Iorio
The Exact String Black-Hole behind the hadronic Rindler horizon?
15 pages, 2 eps figures
Phys.Rev.D77:124034,2008
10.1103/PhysRevD.77.124034
MIT-CTP 3927
hep-th hep-ph
null
The recently suggested interpretation of the universal hadronic freeze-out temperature T_f ~ 170 Mev - found for all high energy scattering processes that produce hadrons: e+ e-, p p, p anti-p, pi p, etc. and N N' (heavy-ion collisions) - as a Unruh temperature triggers here the search for the gravitational black-hole that in its near-horizon approximation better simulates this hadronic phenomenon. To identify such a black-hole we begin our gravity-gauge theory phenomenologies matching by asking the question: which black-hole behind that Rindler horizon could reproduce the experimental behavior of T_f (\sqrt{s}) in N N', where \sqrt{s} is the collision energy. Provided certain natural assumptions hold, we show that the exact string black-hole turns out to be the best candidate (as it fits the available data on T_f (\sqrt{s})) and that its limiting case, the Witten black-hole, is the unique candidate to explain the constant T_f for all elementary scattering processes at large energy. We also are able to propose an effective description of the screening of the hadronic string tension sigma(mu_b) due to the baryon density effects on T_f.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 17:52:18 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Castorina", "P.", "" ], [ "Grumiller", "D.", "" ], [ "Iorio", "A.", "" ] ]
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802.2287
Michael Eisermann
Michael Eisermann
The Jones polynomial of ribbon links
38 pages, reformatted in G&T style; minor changes suggested by the referee
Geom. Topol. 13 (2009) 623-660
10.2140/gt.2009.13.623
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For every n-component ribbon link L we prove that the Jones polynomial V(L) is divisible by the polynomial V(O^n) of the trivial link. This integrality property allows us to define a generalized determinant det V(L) := [V(L)/V(O^n)]_(t=-1), for which we derive congruences reminiscent of the Arf invariant: every ribbon link L = (K_1,...,K_n) satisfies det V(L) = det(K_1) >... det(K_n) modulo 32, whence in particular det V(L) = 1 modulo 8. These results motivate to study the power series expansion V(L) = \sum_{k=0}^\infty d_k(L) h^k at t=-1, instead of t=1 as usual. We obtain a family of link invariants d_k(L), starting with the link determinant d_0(L) = det(L) obtained from a Seifert surface S spanning L. The invariants d_k(L) are not of finite type with respect to crossing changes of L, but they turn out to be of finite type with respect to band crossing changes of S. This discovery is the starting point of a theory of surface invariants of finite type, which promises to reconcile quantum invariants with the theory of Seifert surfaces, or more generally ribbon surfaces.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:39:35 GMT" }, { "version": "v2", "created": "Mon, 28 Jul 2008 11:32:14 GMT" } ]
"2014-11-11T00:00:00"
[ [ "Eisermann", "Michael", "" ] ]
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802.2288
Virgil Pierce
Yuji Kodama and Virgil U. Pierce
The Pfaff lattice on symplectic matrices
null
null
null
null
nlin.SI math-ph math.MP math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Pfaff lattice is an integrable system arising from the SR-group factorization in an analogous way to how the Toda lattice arises from the QR-group factorization. In our recent paper [{\it Intern. Math. Res. Notices}, (2007) rnm120], we studied the Pfaff lattice hierarchy for the case where the Lax matrix is defined to be a lower Hessenberg matrix. In this paper we deal with the case of a symplectic lower Hessenberg Lax matrix, this forces the Lax matrix to take a tridiagonal shape. We then show that the odd members of the Pfaff lattice hierarchy are trivial, while the even members are equivalent to the indefinite Toda lattice hierarchy defined in [Y. Kodama and J. Ye, {\it Physica D}, {\bf 91} (1996) 321-339]. This is analogous to the case of the Toda lattice hierarchy in the relation to the Kac-van Moerbeke system. In the case with initial matrix having only real or imaginary eigenvalues, the fixed points of the even flows are given by $2\times 2$ block diagonal matrices with zero diagonals. We also consider a family of skew-orthogonal polynomials with symplectic recursion relation related to the Pfaff lattice, and find that they are succinctly expressed in terms of orthogonal polynomials appearing in the indefinite Toda lattice.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:19:18 GMT" }, { "version": "v2", "created": "Wed, 27 May 2009 14:26:24 GMT" } ]
"2009-05-27T00:00:00"
[ [ "Kodama", "Yuji", "" ], [ "Pierce", "Virgil U.", "" ] ]
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802.2289
Alejandro Romanelli
Alejandro Romanelli
The Fibonacci quantum walk and its cassical trace map
5 pages, 3 figures
null
10.1016/j.physa.2009.06.022
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the quantum walk in momentum space using a coin arranged in quasi-periodic sequences following a Fibonacci prescription. We build for this system a classical map based on the trace of the evolution operator. The sub-ballistic behavior of this quantum walk is connected with the power-law decay of the time correlations of the trace map.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 21:20:55 GMT" } ]
"2015-05-13T00:00:00"
[ [ "Romanelli", "Alejandro", "" ] ]
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802.229
Louis Leblond
Louis Leblond and Sarah Shandera
Simple Bounds from the Perturbative Regime of Inflation
26 pages, 4 figures, v3; added references and clarifications, typos corrected, published version
JCAP0808:007,2008
10.1088/1475-7516/2008/08/007
MIFP-08-01
hep-th astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine the conditions under which a perturbative expansion around an inflating background is valid. When inflation is driven by a single field with a general sound speed, we find a lower limit on the sound speed related to the amplitude of the inflationary power spectrum. Generalizing the sound speed constraints to include scale dependence can limit the number of e-folds obtained in the perturbative regime and restrict otherwise apparently viable models. We also show that for models with a low sound speed, eternal inflation cannot occur in the perturbative regime.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 17:13:50 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 16:16:22 GMT" }, { "version": "v3", "created": "Fri, 11 Jul 2008 13:30:39 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Leblond", "Louis", "" ], [ "Shandera", "Sarah", "" ] ]
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802.2291
Syed Raghib Hassan
B. Davoudi, S. R. Hassan and A.-M. S. Tremblay
Competition between charge and spin order in the $t-U-V$ extended Hubbard model on the triangular lattice
null
Phys. Rev. B 77, 214408 (2008)
10.1103/PhysRevB.77.214408
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several new classes of compounds can be modeled in first approximation by electrons on the triangular lattice that interact through on-site repulsion $U$ as well as nearest-neighbor repulsion $V$. This extended Hubbard model on a triangular lattice has been studied mostly in the strong coupling limit for only a few types of instabilities. Using the extended two-particle self consistent approach (ETPSC), that is valid at weak to intermediate coupling, we present an unbiased study of the density and interaction dependent crossover diagram for spin and charge density wave instabilities of the normal state at arbitrary wave vector. When $U$ dominates over $V$ and electron filling is large, instabilities are chiefly in the spin sector and are controlled mostly by Fermi surface properties. Increasing $V$ eventually leads to charge instabilities. In the latter case, it is mostly the wave vector dependence of the vertex that determines the wave vector of the instability rather than Fermi surface properties. At small filling, non-trivial instabilities appear only beyond the weak coupling limit. There again, charge density wave instabilities are favored over a wide range of dopings by large $V$ at wave vectors corresponding to $\sqrt(3) \times \sqrt(3)$ superlattice in real space. Commensurate fillings do not play a special role for this instability. Increasing $U$ leads to competition with ferromagnetism. At negative values of $U$ or $V$, neglecting superconducting fluctuations, one finds that charge instabilities are favored. In general, the crossover diagram presents a rich variety of instabilities. We also show that thermal charge-density wave fluctuations in the renormalized classical regime can open a pseudogap in the single-particle spectral weight, just as spin or superconducting fluctuations.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 18:17:02 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Davoudi", "B.", "" ], [ "Hassan", "S. R.", "" ], [ "Tremblay", "A. -M. S.", "" ] ]
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802.2292
Massimo Marengo
Massimo Marengo (1), Megan Reiter (2), Giovanni G. Fazio (1) ((1) Harvard-Smithsonian CfA, (2) University of California Berkeley)
Spitzer/IRAC Observations of AGB stars
8 pages, to be published in proceedings "IX Torino Workshop on Evolution and Nucleosynthesis in AGB Stars", 22-26 October 2007, Perugia, Italy
AIP Conf.Proc.1001:331-338,2008
10.1063/1.2916982
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present here the first observation of galactic AGB stars with the InfraRed Array Camera (IRAC) onboard the Spitzer Space Telescope. Our sample consists of 48 AGB stars of different chemical signature, mass loss rate and variability class. For each star we have measured IRAC photometry and colors. Preliminary results shows that IRAC colors are sensitive to spectroscopic features associated to molecules and dust in the AGB wind. Period is only loosely correlated to the brightness of the stars in the IRAC bands. We do find, however, a tight period-color relation for sources classified as semiregular variables. This may be interpreted as the lack of warm dust in the wind of the sources in this class, as opposed to Mira variables that show higher infrared excess in all IRAC bands.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 22:20:36 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Marengo", "Massimo", "" ], [ "Reiter", "Megan", "" ], [ "Fazio", "Giovanni G.", "" ] ]
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802.2293
Alexander Tsirlin
Alexander A. Tsirlin, Ramesh Nath, Christoph Geibel, Helge Rosner
Magnetic properties of Ag(2)VOP(2)O(7): an unexpected spin dimer system
8 pages, 5 figures; to appear in PRB
Phys. Rev. B, 77, 104436 (2008)
10.1103/PhysRevB.77.104436
null
cond-mat.str-el cond-mat.mtrl-sci
null
Magnetic properties of the silver vanadium phosphate Ag(2)VOP(2)O(7) are studied by means of magnetic susceptibility measurements and electronic structure calculations. In spite of the layered crystal structure suggesting 1D or 2D magnetic behavior, this compound can be understood as a spin dimer system. The fit of the magnetic susceptibility indicates an intradimer interaction of about 30 K in perfect agreement with the computational results. Our study emphasizes the possible pitfalls in interpreting experimental data on structural basis only and points out the importance of microscopic models for the understanding of the magnetic properties of vanadium phosphates.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 22:45:49 GMT" } ]
"2008-03-27T00:00:00"
[ [ "Tsirlin", "Alexander A.", "" ], [ "Nath", "Ramesh", "" ], [ "Geibel", "Christoph", "" ], [ "Rosner", "Helge", "" ] ]
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802.2294
J. Scott Carter
J. Scott Carter (Univ. of South Alabama), Alissa Crans (Loyola Marymount Univ.), Mohamed Elhamdadi (Univ. of South Florida), Masahico Saito (Univ. of South Florida)
Cocycle Deformations of Algebraic Identities and R-matrices
17 pages, 15 figures, submitted to the Quantum Topology Hanoi Conference Proceedings
null
null
null
math.GT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For an arbitrary identity L=R between compositions of maps L and R on tensors of vector spaces V, a general construction of a 2-cocycle condition is given. These 2-cocycles correspond to those obtained in deformation theories of algebras. The construction is applied to a canceling pairings and copairings, with explicit examples with calculations. Relations to the Kauffman bracket and knot invariants are discussed.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 22:57:10 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Carter", "J. Scott", "", "Univ. of South Alabama" ], [ "Crans", "Alissa", "", "Loyola\n Marymount Univ." ], [ "Elhamdadi", "Mohamed", "", "Univ. of South Florida" ], [ "Saito", "Masahico", "", "Univ. of South Florida" ] ]
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802.2295
Michael Gershenson
Sergey Gladchenko, David Olaya, Eva Dupont-Ferrier, Benoit Doucot, Lev B. Ioffe, and Michael E. Gershenson
Superconducting Nanocircuits for Topologically Protected Qubits
25 pages, 5 figures
Nature Physics 5, 48-53 (2009)
10.1038/nphys1151
null
cond-mat.mes-hall cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For successful realization of a quantum computer, its building blocks (qubits) should be simultaneously scalable and sufficiently protected from environmental noise. Recently, a novel approach to the protection of superconducting qubits has been proposed. The idea is to prevent errors at the "hardware" level, by building a fault-free (topologically protected) logical qubit from "faulty" physical qubits with properly engineered interactions between them. It has been predicted that the decoupling of a protected logical qubit from local noises would grow exponentially with the number of physical qubits. Here we report on the proof-of-concept experiments with a prototype device which consists of twelve physical qubits made of nanoscale Josephson junctions. We observed that due to properly tuned quantum fluctuations, this qubit is protected against magnetic flux variations well beyond linear order, in agreement with theoretical predictions. These results demonstrate the feasibility of topologically protected superconducting qubits.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 23:07:38 GMT" } ]
"2013-03-06T00:00:00"
[ [ "Gladchenko", "Sergey", "" ], [ "Olaya", "David", "" ], [ "Dupont-Ferrier", "Eva", "" ], [ "Doucot", "Benoit", "" ], [ "Ioffe", "Lev B.", "" ], [ "Gershenson", "Michael E.", "" ] ]
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802.2296
Xuelei Chen
Yan Gong, Xuelei Chen
Cosmological Constraints on Invisible Decay of Dark Matter
null
Phys.Rev.D77:103511,2008
10.1103/PhysRevD.77.103511
null
astro-ph
null
The cold dark matter may be in a meta-stable state and decays to other particles with a very long lifetime. If the decaying products of the dark matter are weakly interacting, e.g. neutrinos, then it would have little impact on astrophysical processes and is therefore difficult to observe. However, such a decay would affect the expansion history of the Universe because of the change of the equation of state. We utilize a high-quality type Ia supernovae (SN Ia) data set selected from several resent observations and the position of the first peak of the Cosmic Microwave Background (CMB) angular spectrum given by the WMAP three-year data to constrain the dark matter decay-to-neutrino rate $\Gamma=\alpha \Gamma_{\chi}$, where $\alpha$ is the fraction of the rest mass which gets converted to neutrinos, and $\Gamma_{\chi}$ is the decay width. We find that $\Gamma^{-1} > 0.7\times10^3$ Gyr at 95.5% confidence level.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 00:22:08 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 12:22:57 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Gong", "Yan", "" ], [ "Chen", "Xuelei", "" ] ]
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802.2297
Henryk Gzyl
Henryk Gzyl
Predictive approach to some quantum paradoxes
null
null
null
null
math-ph math.MP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In classical probability theory, the best predictor of a future observation of a random variable $X,$ is its expected value $E_P[X]$ when no other information is available When information consisting in the observation of another random variable $Y$ is available, then the best predictor of $X$ is another random variable $E_P[X|Y].$ It is the purpose of this note to explore the analogue of this in the case of quantum mechanics. We shall see that exactly as in classical prediction theory, when the result of an observation is taken into account by means of a non-commutative conditional expectation, some of the usual paradoxes cease to be such.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 23:13:40 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 14:43:07 GMT" }, { "version": "v3", "created": "Mon, 20 Oct 2008 00:15:33 GMT" }, { "version": "v4", "created": "Mon, 28 Sep 2009 21:09:48 GMT" } ]
"2009-09-29T00:00:00"
[ [ "Gzyl", "Henryk", "" ] ]
[ -0.042699609, 0.0052310149, -0.0847981647, 0.0368393697, 0.0293011963, 0.0250813235, 0.025356805, 0.0433757901, -0.0398696624, -0.0092286244, 0.038742695, -0.0735785589, 0.0054658004, 0.0002701987, -0.0071938196, 0.0264462084, -0.0342097729, 0.0260455087, -0.005365625, 0.1298268437, -0.0941144451, -0.033107847, 0.0111695165, -0.0343850814, -0.0122213541, -0.1311291158, 0.023766527, 0.1092909575, 0.0942647085, 0.0149761671, 0.0813421234, -0.0393186994, -0.0119521338, -0.0370647609, 0.0099110669, 0.0800398514, 0.0228148643, 0.0555470549, -0.0987725854, 0.0738289952, -0.0541946925, -0.0684195459, -0.0802401975, 0.0537939928, -0.0235536546, -0.0251689777, 0.0137740672, -0.1240166873, -0.0040320451, 0.0894062147, -0.0549460053, -0.0317805298, -0.0506885648, 0.0760328472, -0.0839466751, -0.1072874591, -0.0175181087, -0.0046487474, 0.0124091823, -0.0272225644, 0.0720759332, -0.102579236, -0.0109629054, 0.1089904383, -0.0514398776, -0.0281491838, 0.0243675765, -0.0070936447, -0.0741796121, 0.0124717914, -0.0300024226, -0.0040570889, 0.0798895881, 0.0649134219, -0.028825365, 0.0591032691, 0.0930125192, 0.0620584339, -0.0040883934, 0.0190833434, 0.0632605329, -0.0086463578, -0.0019878482, -0.029376328, -0.0691207722, 0.0063204183, 0.0096981954, -0.0574002936, -0.0728773326, -0.0732279494, 0.041697856, 0.0078512179, -0.0671673566, 0.0211494546, 0.0176934153, -0.0061701559, 0.1167039126, 0.0073628649, 0.0379162505, 0.0039506527, -0.0004288744, 0.0180565491, 0.0238917451, -0.056548804, 0.1531676203, 0.0277234409, -0.135035947, -0.0219132882, -0.0670170933, 0.0286751036, -0.0661155209, -0.0222263355, -0.126921773, -0.0073252991, -0.0732780397, -0.1045827344, -0.1185070649, -0.0038379559, 0.0747806653, 0.1063858867, -0.0496116839, -0.0723764598, 0.0358626619, -0.0045642247, 0.0461055599, -0.1285245717, 0.0147006856, -0.1597791761, -0.0026436818, 0.0111256894, 0.0856997371, -0.0024433318, -0.0500123836, -0.0887049884, -0.0200224854, -0.1050836071, 0.1279235184, -0.0045454423, 0.013586239, -0.0002670682, 0.0226896442, -0.0012224484, 0.0197845697, -0.0219884198, -0.0732279494, 0.112897262, 0.0352616124, -0.0202478785, -0.0358376168, 0.0142498985, -0.0094540184, -0.0336838551, -0.0148759922, 0.0403955802, 0.1101925373, -0.0772349536, 0.0121399621, 0.0648132488, -0.0523915403, -0.0728272498, -0.0221887697, 0.0634107962, -0.1163032129, 0.0166040119, 0.1618828475, 0.0228023417, -0.1021785364, -0.0243550539, -0.0122589199, -0.0359878801, -0.0048365756, 0.024542883, -0.0032400363, 0.0585523061, -0.0088967951, 0.0395190492, -0.0662657842, -0.1762078851, -0.0690706819, -0.0448032841, -0.0413222015, 0.0428749137, 0.0731778592, -0.0519908406, 0.036764238, -0.0431003086, -0.0557474047, -0.0251940209, -0.0160655715, -0.0434759632, 0.0167292301, 0.0479337536, 0.1013771296, 0.0668668374, -0.0186951663, -0.0694212988, 0.1170044392, 0.0436512716, -0.0440018848, -0.0649134219, -0.0521411039, 0.0261456836, 0.079238452, -0.0471323542, 0.0439517945, 0.0449034572, 0.2021532208, -0.0670170933, -0.182819441, 0.0034466472, -0.015689915, -0.0745803118, 0.0326570608, 0.0858500004, -0.0306786038, -0.0126408366, -0.1491606236, 0.0514398776, -0.0489855893, 0.0771347731, -0.0871021897, 0.0668668374, 0.0440269262, 0.0788377523, -0.0882542059, -0.0348108225, 0.1561728716, 0.0208614506, -0.050738655, -0.0136738922, -0.0029755116, 0.0013758414, -0.0666664839, -0.0591032691, 0.0298271161, -0.0205484033, 0.013423454, -0.0360630117, -0.0486600213, 0.0014885383, 0.0730776861, 0.0551964417, -0.0104808128, 0.0260955952, -0.0120961349, -0.008139221, -0.0333833285, -0.0080202632, 0.0396442674, 0.0178937651, 0.0081329606, -0.0152892144, 0.0500875153, 0.003324559, -0.022113638, -0.1034808084 ]
802.2298
Tony Wong
T. Wong, E. F. Ladd, D. Brisbin, M. G. Burton, I. Bains, M. R. Cunningham, N. Lo, P. A. Jones, K. L. Thomas, S. N. Longmore, A. Vigan, B. Mookerjea, C. Kramer, Y. Fukui, A. Kawamura
Molecular line mapping of the giant molecular cloud associated with RCW 106 - II. Column density and dynamical state of the clumps
17 pages, to appear in MNRAS
null
10.1111/j.1365-2966.2008.13107.x
null
astro-ph
null
We present a fully sampled C^{18}O (1-0) map towards the southern giant molecular cloud (GMC) associated with the HII region RCW 106, and use it in combination with previous ^{13}CO (1-0) mapping to estimate the gas column density as a function of position and velocity. We find localized regions of significant ^{13}CO optical depth in the northern part of the cloud, with several of the high-opacity clouds in this region likely associated with a limb-brightened shell around the HII region G333.6-0.2. Optical depth corrections broaden the distribution of column densities in the cloud, yielding a log-normal distribution as predicted by simulations of turbulence. Decomposing the ^{13}CO and C^{18}O data cubes into clumps, we find relatively weak correlations between size and linewidth, and a more sensitive dependence of luminosity on size than would be predicted by a constant average column density. The clump mass spectrum has a slope near -1.7, consistent with previous studies. The most massive clumps appear to have gravitational binding energies well in excess of virial equilibrium; we discuss possible explanations, which include magnetic support and neglect of time-varying surface terms in the virial theorem. Unlike molecular clouds as a whole, the clumps within the RCW 106 GMC, while elongated, appear to show random orientations with respect to the Galactic plane.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 23:34:23 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Wong", "T.", "" ], [ "Ladd", "E. F.", "" ], [ "Brisbin", "D.", "" ], [ "Burton", "M. G.", "" ], [ "Bains", "I.", "" ], [ "Cunningham", "M. R.", "" ], [ "Lo", "N.", "" ], [ "Jones", "P. A.", "" ], [ "Thomas", "K. L.", "" ], [ "Longmore", "S. N.", "" ], [ "Vigan", "A.", "" ], [ "Mookerjea", "B.", "" ], [ "Kramer", "C.", "" ], [ "Fukui", "Y.", "" ], [ "Kawamura", "A.", "" ] ]
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802.2299
Antonio Candido de Siqueira V. V.
A. C. V. V. de Siqueira
Mapping among manifolds 1
16 pages
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we have build the modified Hamiltonian formalism for geometric objects like the Jacobi fields and metric tensors. In this approach Jacobi fields and metric tensors are mapped among manifold. As an application, we have mapped a general n-dimensional Riemannian manifold to a n-dimensional maximally symmetric spacetime.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:45:20 GMT" } ]
"2008-02-19T00:00:00"
[ [ "de Siqueira", "A. C. V. V.", "" ] ]
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802.23
Elchanan Mossel
Per Austrin and Elchanan Mossel
Approximation Resistant Predicates From Pairwise Independence
null
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the approximability of predicates on $k$ variables from a domain $[q]$, and give a new sufficient condition for such predicates to be approximation resistant under the Unique Games Conjecture. Specifically, we show that a predicate $P$ is approximation resistant if there exists a balanced pairwise independent distribution over $[q]^k$ whose support is contained in the set of satisfying assignments to $P$.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 23:21:05 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Austrin", "Per", "" ], [ "Mossel", "Elchanan", "" ] ]
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802.2301
Anh-Thu Le
Anh-Thu Le, R. Della Picca, P.D. Fainstein, D. A. Telnov, M. Lein, C.D. Lin
Theory of high-order harmonic generation from molecules by intense laser pulses
10 pages, 5 figures
J. Phys. B: At. Mol. Opt. Phys. 41, 081002 (2008)
10.1088/0953-4075/41/8/081002
null
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that high-order harmonics generated from molecules by intense laser pulses can be expressed as the product of a returning electron wave packet and the photo-recombination cross section (PRCS) where the electron wave packet can be obtained from simple strong-field approximation (SFA) or from a companion atomic target. Using these wave packets but replacing the PRCS obtained from SFA or from the atomic target by the accurate PRCS from molecules, the resulting HHG spectra are shown to agree well with the benchmark results from direct numerical solution of the time-dependent Schr\"odinger equation, for the case of H$_2^+$ in laser fields. The result illustrates that these powerful theoretical tools can be used for obtaining high-order harmonic spectra from molecules. More importantly, the results imply that the PRCS extracted from laser-induced HHG spectra can be used for time-resolved dynamic chemical imaging of transient molecules with temporal resolutions down to a few femtoseconds.
[ { "version": "v1", "created": "Fri, 15 Feb 2008 23:37:38 GMT" } ]
"2008-04-04T00:00:00"
[ [ "Le", "Anh-Thu", "" ], [ "Della Picca", "R.", "" ], [ "Fainstein", "P. D.", "" ], [ "Telnov", "D. A.", "" ], [ "Lein", "M.", "" ], [ "Lin", "C. D.", "" ] ]
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802.2302
Lukasz Stawarz
M. Sikora, L. Stawarz, and J.-P. Lasota
Radio-loudness of Active Galaxies and the Black Hole Evolution
9 pages, 5 figures included. To be published in New Astronomy Review (Proceedings of the meeting `JPL, X-ray Binaries, Accretion Disks, and Compact Stars'; October 2007; ed. M.A. Abramowicz)
New Astron.Rev.51:891-897,2008
10.1016/j.newar.2008.03.021
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Active galactic nuclei (AGNs) form two distinct sequences on the radio-loudness -- Eddington-ratio plane. The `upper' sequence contains radio selected AGNs, the `lower' sequence is composed mainly of optically selected AGNs. The sequences mark the upper bounds for the radio-loudness of two distinct populations of AGNs, hosted respectively by elliptical and disk galaxies. Both sequences show the same dependence of the radio-loudness on the Eddington ratio (an increase with decreasing Eddington ratio), which suggests that another parameter in addition to the accretion rate must play a role in determining the efficiency of jet production in AGNs. We speculate that this additional parameter is the spin of the black hole, assuming that black holes in giant elliptical galaxies have (on average) much larger spins than black holes in disc galaxies. Possible evolutionary scenarios leading to such a spin dichotomy are discussed. The galaxy-morphology related radio-dichotomy breaks down at high accretion rates where the dominant fraction of luminous quasars being hosted by giant ellipticals is radio quiet. This indicates that the production of powerful jets at high accretion rates is in most cases suppressed and, in analogy to X-ray binary systems (XRB) during high and very high states, may be intermittent. Such intermittency can be caused by switches between two different accretion modes, assuming that only during one of them an outflow from the central engine is sufficiently collimated to form a relativistic jet.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 00:27:50 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Sikora", "M.", "" ], [ "Stawarz", "L.", "" ], [ "Lasota", "J. -P.", "" ] ]
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