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802.2303
Thomas Vojta
J. A. Hoyos and Thomas Vojta
Theory of smeared quantum phase transitions
4 pages, 1 eps figure embedded; (v2) contains the full joint field and moment distribution + we fixed a few typos; (v3) published version + typos corrected
Phys. Rev. Lett. 100, 240601 (2008)
10.1103/PhysRevLett.100.240601
null
cond-mat.str-el cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an analytical strong-disorder renormalization group theory of the quantum phase transition in the dissipative random transverse-field Ising chain. For Ohmic dissipation, we solve the renormalization flow equations analytically, yielding asymptotically exact results for the low-temperature properties of the system. We find that the interplay between quantum fluctuations and Ohmic dissipation destroys the quantum critical point by smearing. We also determine the phase diagram and the behavior of observables in the vicinity of the smeared quantum phase transition.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 00:32:33 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 05:25:35 GMT" }, { "version": "v3", "created": "Mon, 23 Jun 2008 13:34:24 GMT" } ]
2008-06-23T00:00:00
[ [ "Hoyos", "J. A.", "" ], [ "Vojta", "Thomas", "" ] ]
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802.2304
Christian Hicke
C. Hicke and M. I. Dykman
Hysteresis, transient oscillations, and nonhysteretic switching in resonantly modulated large-spin systems
Submitted to PRB
null
null
null
cond-mat.mes-hall cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the classical dynamics of resonantly modulated large-spin systems in a strong magnetic field. We show that these systems have special symmetry. It leads to characteristic nonlinear effects. They include abrupt switching between magnetization branches with varying modulating field without hysteresis and a specific pattern of switching in the presence of multistability and hysteresis. Along with steady forced vibrations the transverse spin components can display transient vibrations at a combination of the Larmor frequency and a slower frequency determined by the anisotropy energy. The analysis is based on a microscopic theory that takes into account relaxation mechanisms important for single-molecule magnets and other large-spin systems. We find how the Landau-Lifshitz model should be modified in order to describe the classical spin dynamics. The occurrence of transient oscillations depends on the interrelation between the relaxation parameters.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 00:53:21 GMT" } ]
2008-02-19T00:00:00
[ [ "Hicke", "C.", "" ], [ "Dykman", "M. I.", "" ] ]
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802.2305
Ping Li
Ping Li
Compressed Counting
null
null
null
null
cs.IT cs.CC cs.DM cs.DS cs.LG math.IT
null
Counting is among the most fundamental operations in computing. For example, counting the pth frequency moment has been a very active area of research, in theoretical computer science, databases, and data mining. When p=1, the task (i.e., counting the sum) can be accomplished using a simple counter. Compressed Counting (CC) is proposed for efficiently computing the pth frequency moment of a data stream signal A_t, where 0<p<=2. CC is applicable if the streaming data follow the Turnstile model, with the restriction that at the time t for the evaluation, A_t[i]>= 0, which includes the strict Turnstile model as a special case. For natural data streams encountered in practice, this restriction is minor. The underly technique for CC is what we call skewed stable random projections, which captures the intuition that, when p=1 a simple counter suffices, and when p = 1+/\Delta with small \Delta, the sample complexity of a counter system should be low (continuously as a function of \Delta). We show at small \Delta the sample complexity (number of projections) k = O(1/\epsilon) instead of O(1/\epsilon^2). Compressed Counting can serve a basic building block for other tasks in statistics and computing, for example, estimation entropies of data streams, parameter estimations using the method of moments and maximum likelihood. Finally, another contribution is an algorithm for approximating the logarithmic norm, \sum_{i=1}^D\log A_t[i], and logarithmic distance. The logarithmic distance is useful in machine learning practice with heavy-tailed data.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 16:42:52 GMT" }, { "version": "v2", "created": "Sun, 24 Feb 2008 09:51:09 GMT" } ]
2008-02-24T00:00:00
[ [ "Li", "Ping", "" ] ]
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802.2306
Gareth Baxter
G. J. Baxter, M. R. Frean
Software graphs and programmer awareness
9 pages, 8 figures
null
null
null
cs.SE cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dependencies between types in object-oriented software can be viewed as directed graphs, with types as nodes and dependencies as edges. The in-degree and out-degree distributions of such graphs have quite different forms, with the former resembling a power-law distribution and the latter an exponential distribution. This effect appears to be independent of application or type relationship. A simple generative model is proposed to explore the proposition that the difference arises because the programmer is aware of the out-degree of a type but not of its in-degree. The model reproduces the two distributions, and compares reasonably well to those observed in 14 different type relationships across 12 different Java applications.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 03:38:03 GMT" } ]
2008-02-19T00:00:00
[ [ "Baxter", "G. J.", "" ], [ "Frean", "M. R.", "" ] ]
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802.2307
Rukmini Dey Dr.
Rukmini Dey
Geometric prequantization of a modified Seiberg-Witten moduli space in 2 dimensions
null
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider a dimensional reduction of slightly modified Seiberg-Witten equations, the modification being a different choice of the Pauli matrices which go into defining the equations. We get interesting equations with a Higgs field, spinors and a connection. We show interesting solutions of these equations. Then we go on to show a family of symplectic structures on the moduli space of these equations which can be geometrically prequantized using the Quillen determinant line bundle.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 04:02:17 GMT" } ]
2008-02-19T00:00:00
[ [ "Dey", "Rukmini", "" ] ]
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802.2308
Min Long
M. Long, M.M. Romanova, and R.V.E. Lovelace
Three-dimensional Simulations of Accretion to Stars with Complex Magnetic Fields
13 pages, 21 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13124.x
null
astro-ph
null
Disk accretion to rotating stars with complex magnetic fields is investigated using full three-dimensional magnetohydrodynamic (MHD) simulations. The studied magnetic configurations include superpositions of misaligned dipole and quadrupole fields and off-centre dipoles. The simulations show that when the quadrupole component is comparable to the dipole component, the magnetic field has a complex structure with three major magnetic poles on the surface of the star and three sets of loops of field lines connecting them. A significant amount of matter flows to the quadrupole "belt", forming a ring-like hot spot on the star. If the maximum strength of the magnetic field on the star is fixed, then we observe that the mass accretion rate, the torque on the star, and the area covered by hot spots are several times smaller in the quadrupole-dominant cases than in the pure dipole cases. The influence of the quadrupole component on the shape of the hot spots becomes noticeable when the ratio of the quadrupole and dipole field strengths $B_q/B_d\gtrsim0.5$, and becomes dominant when $B_q/B_d\gtrsim1$. In the case of an off-centre dipole field, most of the matter flows through a one-armed accretion stream, forming a large hot spot on the surface, with a second much smaller secondary spot. The light curves may have simple, sinusoidal shapes, thus mimicking stars with pure dipole fields. Or, they may be complex and unusual. In some cases the light curves may be indicators of a complex field, in particular if the inclination angle is known independently. We also note that in the case of complex fields, magnetospheric gaps are often not empty, and this may be important for the survival of close-in exosolar planets.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 04:20:19 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 19:38:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Long", "M.", "" ], [ "Romanova", "M. M.", "" ], [ "Lovelace", "R. V. E.", "" ] ]
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802.2309
Marcio Catelan
C. Cort\'es, M. Catelan
The RR Lyrae Period-Luminosity-(Pseudo-)Color and Period-Color-(Pseudo-)Color Relations in the Str\"omgren Photometric System: Theoretical Calibration
10 pages (emulateapj style), 8 figures. To appear in ApJS
null
null
null
astro-ph
null
We present a theoretical calibration of the RR Lyrae period-luminosity-color and period-color-color relations in the multiband uvby Stroemgren photometric system. Our theoretical work is based on calculations of synthetic horizontal branches (HBs) for four different metallicities, fully taking into account evolutionary effects for a wide range in metallicities and HB morphologies. While our results show that "pure" period-luminosity and period-color relations do not exist in the Stroemgren system, which is due to the large scatter that is brought about by evolutionary effects when the uvby bandpasses are used, they also reveal that such scatter can be almost completely taken into account by incorporating Stroemgren pseudo-color [C_0 = (u-v)_0 - (v-b)_0] terms into those equations, thus leading to tight period-luminosity-{\em pseudo}-color (PLpsC) and period-color-{\em pseudo}-color (PCpsC) relations. We provide the latter in the form of analytical fits, so that they can be applied with high precision even in the case of field stars. In view of the very small sensitivity of C_0 to interstellar reddening, our PLpsC and PCpsC relations should be especially useful for the derivation of high-precision distance and reddening values. In this sense, we carry out a first application of our relations to field RR Lyrae stars, finding evidence that the stars RR Lyr, SU Dra, and SS Leo -- but not SV Hya -- are somewhat overluminous (by amounts ranging from ~0.05 to 0.20 mag in y, and thus V) with respect to the average for other RR Lyrae stars of similar metallicity.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 04:35:15 GMT" } ]
2008-02-19T00:00:00
[ [ "Cortés", "C.", "" ], [ "Catelan", "M.", "" ] ]
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802.231
Morimitsu Tanimoto
Hajime Ishimori, Tatsuo Kobayashi, Hiroshi Ohki, Yuji Omura, Ryo Takahashi, Morimitsu Tanimoto
D4 Flavor Symmetry for Neutrino Masses and Mixing
10 pages, 1 figure
Phys.Lett.B662:178-184,2008
10.1016/j.physletb.2008.03.007
KUNS-2126
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the $D_4\times Z_2$ flavor symmetry, which is different from the previous work by Grimus and Lavoura. Our model reduces to the standard model in the low energy and there is no FCNC at the tree level. Putting the experimental data, parameters are fixed, and then the implication of our model is discussed. The condition to realize the tri-bimaximal mixing is presented. The possibility for stringy realization of our model is also discussed.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 04:33:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Ishimori", "Hajime", "" ], [ "Kobayashi", "Tatsuo", "" ], [ "Ohki", "Hiroshi", "" ], [ "Omura", "Yuji", "" ], [ "Takahashi", "Ryo", "" ], [ "Tanimoto", "Morimitsu", "" ] ]
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802.2311
John E. Harper
John E. Harper
Bar constructions and Quillen homology of modules over operads
38 pages, uses xy-pic, minor revision
Algebr. Geom. Topol. 10 (2010) 87-136
10.2140/agt.2010.10.87
null
math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that topological Quillen homology of algebras and modules over operads in symmetric spectra can be calculated by realizations of simplicial bar constructions. Working with several model category structures, we give a homotopical proof after showing that certain homotopy colimits in algebras and modules over operads can be easily understood. A key result here, which lies at the heart of this paper, is showing that the forgetful functor commutes with certain homotopy colimits. We also prove analogous results for algebras and modules over operads in unbounded chain complexes.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 04:48:48 GMT" }, { "version": "v2", "created": "Wed, 25 Feb 2009 15:19:07 GMT" }, { "version": "v3", "created": "Sun, 2 Aug 2009 02:08:10 GMT" }, { "version": "v4", "created": "Sun, 27 Sep 2009 20:55:03 GMT" } ]
2014-10-01T00:00:00
[ [ "Harper", "John E.", "" ] ]
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802.2312
Kazuoki Munakata
Y. Okazaki, A. Fushishita, T. Narumi, C. Kato, S. Yasue, T. Kuwabara, J. W. Bieber, P. Evenson, M. R. Da Silva, A. Dal Lago, N. J. Schuch, Z. Fujii, M. L. Duldig, J. E. Humble, I. Sabbah, J. K\'ota, K. Munakata
Drift effects and the cosmic ray density gradient in a solar rotation period: First observation with the Global Muon Detector Network (GMDN)
35 pages, 10 figures, submitted to the Astrophysical Journal
Astrophys. J. 681:693-707 2008
10.1086/588277
null
astro-ph
null
We present for the first time hourly variations of the spatial density gradient of 50 GeV cosmic rays within a sample solar rotation period in 2006. By inversely solving the transport equation, including diffusion, we deduce the gradient from the anisotropy that is derived from the observation made by the Global Muon Detector Network (GMDN). The anisotropy obtained by applying a new analysis method to the GMDN data is precise and free from atmospheric temperature effects on the muon count rate recorded by ground based detectors. We find the derived north-south gradient perpendicular to the ecliptic plane is oriented toward the Helioshperic Current Sheet (HCS) (i.e. southward in the toward sector of the Interplanetary Magnetic Field (IMF) and northward in the away sector). The orientation of the gradient component parallel to the ecliptic plane remains similar in both sectors with an enhancement of its magnitude seen after the Earth crosses the HCS. These temporal features are interpreted in terms of a local maximum of the cosmic ray density at the HCS. This is consistent with the prediction of the drift model for the $A<0$ epoch. By comparing the observed gradient with the numerical prediction of a simple drift model, we conclude that particle drifts in the large-scale magnetic field play an important role in organizing the density gradient, at least in the present $A<0$ epoch. We also found that corotating interaction regions did not have such a notable effect. Observations with the GMDN provide us with a new tool for investigating cosmic ray transport in the IMF.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 05:31:14 GMT" } ]
2020-12-29T00:00:00
[ [ "Okazaki", "Y.", "" ], [ "Fushishita", "A.", "" ], [ "Narumi", "T.", "" ], [ "Kato", "C.", "" ], [ "Yasue", "S.", "" ], [ "Kuwabara", "T.", "" ], [ "Bieber", "J. W.", "" ], [ "Evenson", "P.", "" ], [ "Da Silva", "M. R.", "" ], [ "Lago", "A. Dal", "" ], [ "Schuch", "N. J.", "" ], [ "Fujii", "Z.", "" ], [ "Duldig", "M. L.", "" ], [ "Humble", "J. E.", "" ], [ "Sabbah", "I.", "" ], [ "Kóta", "J.", "" ], [ "Munakata", "K.", "" ] ]
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802.2313
Zhi L\"u
Zhi L\"u, Mikiya Masuda
Equivariant classification of 2-torus manifolds
16 pages
Colloq. Math. 115 (2009), 171--188.
null
null
math.GT math.AT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A 2-torus manifold is a closed smooth manifold of dimension $n$ with an effective action of a 2-torus group $(\Z_2)^n$ of rank $n$, and it is said to be locally standard if it is locally isomorphic to a faithful representation of $(\Z_2)^n$ on $\R^n$. This paper studies the equivariant classification of locally standard 2-torus manifolds.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 05:07:12 GMT" } ]
2009-09-18T00:00:00
[ [ "Lü", "Zhi", "" ], [ "Masuda", "Mikiya", "" ] ]
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802.2314
Sang-Jin Lee
Eon-Kyung Lee and Sang-Jin Lee
Injectivity on the set of conjugacy classes of some monomorphisms between Artin groups
27 pages, 16 figures, published version
Journal of Algebra, vol. 323, no. 7, pp. 1879-1907, 2010
10.1016/j.jalgebra.2008.12.013
null
math.GT math.GR
http://creativecommons.org/licenses/publicdomain/
There are well-known monomorphisms between the Artin groups of finite type $\arA_n$, $\arB_n=\arC_n$ and affine type $\tilde \arA_{n-1}$, $\tilde\arC_{n-1}$. The Artin group $A(\arA_n)$ is isomorphic to the $(n+1)$-strand braid group $B_{n+1}$, and the other three Artin groups are isomorphic to some subgroups of $B_{n+1}$. The inclusions between these subgroups yield monomorphisms $A(\arB_n)\to A(\arA_n)$, $A(\tilde \arA_{n-1})\to A(\arB_n)$ and $A(\tilde \arC_{n-1})\to A(\arB_n)$. There are another type of monomorphisms $A(\arB_d)\to A(\arA_{md-1})$, $A(\arB_d)\to A(\arB_{md})$ and $A(\arB_d)\to A(\arA_{md})$ which are induced by isomorphisms between Artin groups of type $\arB$ and centralizers of periodic braids. In this paper, we show that the monomorphisms $A(\arB_d)\to A(\arA_{md-1})$, $A(\arB_d)\to A(\arB_{md})$ and $A(\arB_d)\to A(\arA_{md})$ induce injective functions on the set of conjugacy classes, and that none of the monomorphisms $A(\arB_n)\to A(\arA_n)$, $A(\tilde \arA_{n-1})\to A(\arB_n)$ and $A(\tilde \arC_{n-1})\to A(\arB_n)$ does so.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 05:28:14 GMT" }, { "version": "v2", "created": "Thu, 12 Feb 2009 10:59:31 GMT" } ]
2011-11-08T00:00:00
[ [ "Lee", "Eon-Kyung", "" ], [ "Lee", "Sang-Jin", "" ] ]
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802.2315
Usha Devi A. R.
A. R. Usha Devi, R. Prabhu, and A. K. Rajagopal
A scheme for amplification and discrimination of photons
8 pages, 3 figures, RevteX, Minor revision, References added
J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 235501
10.1088/0953-4075/41/23/235501
null
quant-ph
http://creativecommons.org/licenses/by/3.0/
A scheme for exploring photon number amplification and discrimination is presented based on the interaction of a large number of two-level atoms with a single mode radiation field. The fact that the total number of photons and atoms in the excited states is a constant under time evolution in Dicke model is exploited to rearrange the atom-photon numbers. Three significant predictions emerge from our study: Threshold time for initial exposure to photons, time of perception (time of maximum detection probability), and discrimination of first few photon states.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 05:33:19 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 14:33:21 GMT" }, { "version": "v3", "created": "Mon, 1 Dec 2008 10:28:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Devi", "A. R. Usha", "" ], [ "Prabhu", "R.", "" ], [ "Rajagopal", "A. K.", "" ] ]
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802.2316
Vincent Calvez
Nikolaos Bournaveas, Vincent Calvez (DMA)
Global existence for the kinetic chemotaxis model without pointwise memory effects, and including internal variables
18 pages
null
null
null
math.AP
null
This paper is concerned with the kinetic model of Othmer-Dunbar-Alt for bacterial motion. Following a previous work, we apply the dispersion and Strichartz estimates to prove global existence under several borderline growth assumptions on the turning kernel. In particular we study the kinetic model with internal variables taking into account the complex molecular network inside the cell.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 05:51:41 GMT" } ]
2008-02-19T00:00:00
[ [ "Bournaveas", "Nikolaos", "", "DMA" ], [ "Calvez", "Vincent", "", "DMA" ] ]
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802.2317
Christophe Prieur
Christophe Prieur (LIAFA), Dominique Cardon, Jean-Samuel Beuscart, Nicolas Pissard, Pascal Pons (LIAFA)
The Stength of Weak cooperation: A Case Study on Flickr
null
null
null
null
cs.CY
null
Web 2.0 works with the principle of weak cooperation, where a huge amount of individual contributions build solid and structured sources of data. In this paper, we detail the main properties of this weak cooperation by illustrating them on the photo publication website Flickr, showing the variety of uses producing a rich content and the various procedures devised by Flickr users themselves to select quality. We underlined the interaction between small and heavy users as a specific form of collective production in large social networks communities. We also give the main statistics on the (5M-users, 150M-photos) data basis we worked on for this study, collected from Flickr website using the public API.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 05:54:08 GMT" } ]
2008-02-19T00:00:00
[ [ "Prieur", "Christophe", "", "LIAFA" ], [ "Cardon", "Dominique", "", "LIAFA" ], [ "Beuscart", "Jean-Samuel", "", "LIAFA" ], [ "Pissard", "Nicolas", "", "LIAFA" ], [ "Pons", "Pascal", "", "LIAFA" ] ]
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802.2318
Akira Ohnishi
C. Ishizuka, A. Ohnishi, K. Tsubakihara, K. Sumiyoshi, S. Yamada
Tables of Hyperonic Matter Equation of State for Core-Collapse Supernovae
23 pages, 6 figures (Fig.3 and related comments on pion potential are corrected in v3.)
J.Phys.G35:085201,2008
10.1088/0954-3899/35/8/085201
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present sets of equation of state (EOS) of nuclear matter including hyperons using an SU_f(3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature, and charge fraction for numerical simulations of core collapse supernovae. Coupling constants of Sigma and Xi hyperons with the sigma meson are determined to fit the hyperon potential depths in nuclear matter, U_Sigma(rho_0) ~ +30 MeV and U_Xi(rho_0) ~ -15 MeV, which are suggested from recent analyses of hyperon production reactions. At low densities, the EOS of uniform matter is connected with the EOS by Shen et al., in which formation of finite nuclei is included in the Thomas-Fermi approximation. In the present EOS, the maximum mass of neutron stars decreases from 2.17 M_sun (Ne mu) to 1.63 M_sun (NYe mu) when hyperons are included. In a spherical, adiabatic collapse of a 15$M_\odot$ star by the hydrodynamics without neutrino transfer, hyperon effects are found to be small, since the temperature and density do not reach the region of hyperon mixture, where the hyperon fraction is above 1 % (T > 40 MeV or rho_B > 0.4 fm^{-3}).
[ { "version": "v1", "created": "Sat, 16 Feb 2008 06:38:58 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 04:18:59 GMT" }, { "version": "v3", "created": "Sun, 29 Jun 2008 07:01:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Ishizuka", "C.", "" ], [ "Ohnishi", "A.", "" ], [ "Tsubakihara", "K.", "" ], [ "Sumiyoshi", "K.", "" ], [ "Yamada", "S.", "" ] ]
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802.2319
Ilya Gruzberg
A. Belikov, I. A. Gruzberg, I. Rushkin
Statistics of harmonic measure and winding of critical curves from conformal field theory
Published version
J. Phys. A: Math. Theor. 41, 285006 (2008)
10.1088/1751-8113/41/28/285006
null
cond-mat.stat-mech math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fractal geometry of random curves appearing in the scaling limit of critical two-dimensional statistical systems is characterized by their harmonic measure and winding angle. The former is the measure of the jaggedness of the curves while the latter quantifies their tendency to form logarithmic spirals. We show how these characteristics are related to local operators of conformal field theory and how they can be computed using conformal invariance of critical systems with central charge $c \leqslant 1$.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 06:56:59 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 17:39:35 GMT" } ]
2008-07-01T00:00:00
[ [ "Belikov", "A.", "" ], [ "Gruzberg", "I. A.", "" ], [ "Rushkin", "I.", "" ] ]
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802.232
Zengguang Huang
Z. G. Huang, X. M. Song, H. Q. Lu and W. Fang
Statefinder Diagnostic for Dilaton Dark Energy
6 pages, 4 figures, type errors corrected, reference no. changed, accepted by Astrophysics and Space Science
Astrophys.SpaceSci.315:175-179,2008
10.1007/s10509-008-9810-y
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Statefinder diagnostic is a useful method which can differ one dark energy model from the others. The Statefinder pair $\{r, s\}$ is algebraically related to the equation of state of dark energy and its first time derivative. We apply in this paper this method to the dilaton dark energy model based on Weyl-Scaled induced gravitational theory. We investigate the effect of the coupling between matter and dilaton when the potential of dilaton field is taken as the Mexican hat form. We find that the evolving trajectory of our model in the $r-s$ diagram is quite different from those of other dark energy models.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 07:26:04 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 03:00:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Huang", "Z. G.", "" ], [ "Song", "X. M.", "" ], [ "Lu", "H. Q.", "" ], [ "Fang", "W.", "" ] ]
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802.2321
Zengguang Huang
Z. G. Huang and H. Q. Lu
Statefinder Diagnostic for Born-Infeld Type Dark Energy Model
3 pages, 4 figures
Chin.Phys.Lett.25:2732-2734,2008.
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a new method--statefinder diagnostic which can differ one dark energy model from the others, we investigate in this letter the dynamics of Born-Infeld(B-I) type dark energy model. The evolutive trajectory of B-I type dark energy with Mexican hat potential model with respect to $e-folding$ time $N$ is shown in the $r(s)$ diagram. When the parameter of noncanonical kinetic energy term $\eta\to0$ or kinetic energy $\dot{\phi}^2\to0$, B-I type dark energy(K-essence) model reduces to Quintessence model or $\Lambda$CDM model corresponding to the statefinder pair $\{r, s\}$=$\{1, 0\}$ respectively. As a result, the the evolutive trajectory of our model in the $r(s)$ diagram in Mexican hat potential is quite different from those of other dark energy models.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 07:39:14 GMT" } ]
2008-11-25T00:00:00
[ [ "Huang", "Z. G.", "" ], [ "Lu", "H. Q.", "" ] ]
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802.2322
Heinz Bauschke
Heinz H. Bauschke, Xianfu Wang, Jane Ye and Xiaoming Yuan
Bregman distances and Klee sets
null
null
null
null
math.FA math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 1960, Klee showed that a subset of a Euclidean space must be a singleton provided that each point in the space has a unique farthest point in the set. This classical result has received much attention; in fact, the Hilbert space version is a famous open problem. In this paper, we consider Klee sets from a new perspective. Rather than measuring distance induced by a norm, we focus on the case when distance is meant in the sense of Bregman, i.e., induced by a convex function. When the convex function has sufficiently nice properties, then - analogously to the Euclidean distance case - every Klee set must be a singleton. We provide two proofs of this result, based on Monotone Operator Theory and on Nonsmooth Analysis. The latter approach leads to results that complement work by Hiriart-Urruty on the Euclidean case.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 07:44:12 GMT" } ]
2008-02-19T00:00:00
[ [ "Bauschke", "Heinz H.", "" ], [ "Wang", "Xianfu", "" ], [ "Ye", "Jane", "" ], [ "Yuan", "Xiaoming", "" ] ]
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802.2323
Nedyalko Dimov Nenov
Nedyalko Nenov
Improvement of graph theory Wei`s inequality
4 pages
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we give a generalization of a result of Wei.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 08:37:04 GMT" } ]
2008-02-19T00:00:00
[ [ "Nenov", "Nedyalko", "" ] ]
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802.2324
Yue He
Hairong Yuan, Yue He
Transonic Potential Flows in A Convergent--Divergent Approximate Nozzle
22 pages
null
null
null
math.AP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we prove existence, uniqueness and regularity of certain perturbed (subsonic--supersonic) transonic potential flows in a two-dimensional Riemannian manifold with "convergent-divergent" metric, which is an approximate model of the de Laval nozzle in aerodynamics. The result indicates that transonic flows obtained by quasi-one-dimensional flow model in fluid dynamics are stable with respect to the perturbation of the velocity potential function at the entry (i.e., tangential velocity along the entry) of the nozzle. The proof is based upon linear theory of elliptic-hyperbolic mixed type equations in physical space and a nonlinear iteration method.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 09:34:36 GMT" } ]
2011-02-19T00:00:00
[ [ "Yuan", "Hairong", "" ], [ "He", "Yue", "" ] ]
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802.2325
Wlodzimierz Jelonek
Wlodzimierz Jelonek
Solitons and affine projectively flat surfaces
null
Nonlinearity and Geometry, Polish Scientific Publishers PWN, Warsow 1998,297-317
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of this paper is to give a local description of affine surfaces, whose induced Blaschke structure is projectively flat. We show that such affine surfaces with constant Gauss affine curvature and indefinite induced Blaschke metric are described by soliton equations.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 11:05:52 GMT" } ]
2008-02-19T00:00:00
[ [ "Jelonek", "Wlodzimierz", "" ] ]
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802.2326
Helene Bouchiat
M.Ferrier, A.Chepelianskii, S.Gu\'eron, H.Bouchiat
Disorder induced transverse delocalisation in ropes of carbon nanotubes
7 pages 8 figures
null
null
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A rope of carbon nanotubes is constituted of an array of parallel single wall nanotubes with nearly identical diameters. In most cases the individual nanotubes within a rope have different helicities and 1/3 of them are metallic. In the absence of disorder within the tubes, the intertube electronic transfer is negligeable because of the longitudinal wave vector mismatch between neighboring tubes of different helicities. The rope can then be considered as a number of parallel independent ballistic nanotubes. On the other hand, the presence of disorder within the tubes favors the intertube electronic transfer. This is first shown using a very simple model where disorder is treated perturbatively inspired by the work in reference \cite{maarouf00}. We then present numerical simulations on a tight binding model of a rope. Disorder induced transverse delocalisation shows up as a spectacular increase of the sensitivity to the transverse boundary conditions in the presence of small disorder. This is accompanied by an increase of the longitudinal localisation length. Implications on the nature of electronic transport within a rope of carbon nanotubes are discussed.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 11:19:48 GMT" } ]
2008-02-19T00:00:00
[ [ "Ferrier", "M.", "" ], [ "Chepelianskii", "A.", "" ], [ "Guéron", "S.", "" ], [ "Bouchiat", "H.", "" ] ]
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802.2327
Xiaoyu Chen
Xiao-yu Chen
The capacity of transmitting atomic qubit with light
4 pages
Quantum Inf Process 9 (2010) 451-462
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quantum information transfer between a single photon and a two-level atom is considered as a part of a quantum channel. The channel is a degradable channel even when there are decays of the atomic excited state and the single photon state, as far as the total excitation of the combined initial state does not exceed 1. The single letter formula for quantum capacity is obtained.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 12:05:14 GMT" } ]
2010-08-16T00:00:00
[ [ "Chen", "Xiao-yu", "" ] ]
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802.2328
Tomotsugu Wakasa
T. Wakasa, E. Ihara, M. Dozono, K. Hatanaka, T. Imamura, M. Kato, S. Kuroita, H. Matsubara, T. Noro, H. Okamura, K. Sagara, Y. Sakemi, K. Sekiguchi, K. Suda, T. Sueta, Y. Tameshige, A. Tamii, H. Tanabe, Y. Yamada
Complete set of polarization transfer coefficients for the ${}^{3}{\rm He}(p,n)$ reaction at 346 MeV and 0 degrees
4 figures, Accepted for publication in Physical Review C
null
10.1103/PhysRevC.77.054611
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report measurements of the cross-section and a complete set of polarization transfer coefficients for the ${}^{3}{\rm He}(p,n)$ reaction at a bombarding energy $T_p$ = 346 MeV and a reaction angle $\theta_{\rm lab}$ = $0^{\circ}$. The data are compared with the corresponding free nucleon-nucleon values on the basis of the predominance of quasi-elastic scattering processes. Significant discrepancies have been observed in the polarization transfer $D_{LL}(0^{\circ})$, which are presumably the result of the three-proton $T$ = 3/2 resonance. The spin--parity of the resonance is estimated to be $1/2^-$, and the distribution is consistent with previous results obtained for the same reaction at $T_p$ = 48.8 MeV.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 12:36:14 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 01:35:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Wakasa", "T.", "" ], [ "Ihara", "E.", "" ], [ "Dozono", "M.", "" ], [ "Hatanaka", "K.", "" ], [ "Imamura", "T.", "" ], [ "Kato", "M.", "" ], [ "Kuroita", "S.", "" ], [ "Matsubara", "H.", "" ], [ "Noro", "T.", "" ], [ "Okamura", "H.", "" ], [ "Sagara", "K.", "" ], [ "Sakemi", "Y.", "" ], [ "Sekiguchi", "K.", "" ], [ "Suda", "K.", "" ], [ "Sueta", "T.", "" ], [ "Tameshige", "Y.", "" ], [ "Tamii", "A.", "" ], [ "Tanabe", "H.", "" ], [ "Yamada", "Y.", "" ] ]
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802.2329
Jugal K. Verma
N. V. Trung and J. K. Verma
Hilbert functions of multigraded algebras, mixed multiplicities of ideals and their applications
34 pages
null
null
null
math.AC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is a survey on major results on Hilbert functions of multigraded algebras and mixed multiplicities of ideals, including their applications to the computation of Milnor numbers of complex analytic hypersurfaces with isolated singularity, multiplicities of blowup algebras and mixed volumes of polytopes.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 03:07:34 GMT" } ]
2008-02-19T00:00:00
[ [ "Trung", "N. V.", "" ], [ "Verma", "J. K.", "" ] ]
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802.233
Peter Csermely
Miklos A. Antal, Csaba Bode and Peter Csermely
Perturbation waves in proteins and protein networks: Applications of percolation and game theories in signaling and drug design
14 pages, 3 figures, 1 table, 80 references
Current Protein and Peptide Science 2009 vol. 10, pp. 161-172
null
null
q-bio.MN nlin.AO physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The network paradigm is increasingly used to describe the dynamics of complex systems. Here we review the current results and propose future development areas in the assessment of perturbation waves, i.e. propagating structural changes in amino acid networks building individual protein molecules and in protein-protein interaction networks (interactomes). We assess the possibilities and critically review the initial attempts for the application of game theory to the often rather complicated process, when two protein molecules approach each other, mutually adjust their conformations via multiple communication steps and finally, bind to each other. We also summarize available data on the application of percolation theory for the prediction of amino acid network- and interactome-dynamics. Furthermore, we give an overview of the dissection of signals and noise in the cellular context of various perturbations. Finally, we propose possible applications of the reviewed methodologies in drug design.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 13:55:00 GMT" }, { "version": "v2", "created": "Thu, 23 Apr 2009 10:14:27 GMT" } ]
2009-04-23T00:00:00
[ [ "Antal", "Miklos A.", "" ], [ "Bode", "Csaba", "" ], [ "Csermely", "Peter", "" ] ]
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802.2331
Yoshikazu Maeda
Y.Maeda (1 and 2), M.Segawa (1), T.Ishida (3), A.Kacharava (2 and 4), M.Nomachi (5), Y.Shimbara (5), Y.Sugaya (5), K.Tamura (6), T.Yagita (3), K.Yasuda (7), H.P.Yoshida (1), C.Wilkin (8) ((1) Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, Japan, (2) Institut f\"ur Kernphysik, Forschungszentrum J\"ulich, J\"ulich, Germany, (3) Department of Physics, Kyushu University, Fukuoka, Japan, (4) High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia, (5) Department of Physics, Osaka University, Toyonaka, Osaka, Japan, (6) Physics Division, Fukui Medical University, Fukui, Japan, (7) The Wakasa Wan Energy Research Center, Fukui, Japan, (8) Physics and Astronomy Department, UCL, Gower Street, London, United Kingdom)
Differential cross section and analyzing power of the ${\vec p}p{\to}pp{\pi}^0$ reaction at a beam energy of 390 MeV
12 pages, 11 figures, 3 tables, submitted to Physical Review C
Phys.Rev.C77:044004,2008
10.1103/PhysRevC.77.044004
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The differential cross section and analyzing power $A_y$ of the ${\vec p}p{\to}pp{\pi}^0$ reaction have been measured at RCNP in coplanar geometry at a beam energy of 390 MeV and the dependence on both the pion emission angle and the relative momentum of the final protons have been extracted. The angular variation of Ay for the large values of the relative momentum studied here shows that this is primarily an effect of the interference of pion s- and p-waves and this interference can also explain the momentum dependence. Within the framework of a very simple model, these results would suggest that the pion-production operator has a significant long-range component.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 14:14:36 GMT" } ]
2015-03-13T00:00:00
[ [ "Maeda", "Y.", "", "1 and 2" ], [ "Segawa", "M.", "", "2 and 4" ], [ "Ishida", "T.", "", "2 and 4" ], [ "Kacharava", "A.", "", "2 and 4" ], [ "Nomachi", "M.", "" ], [ "Shimbara", "Y.", "" ], [ "Sugaya", "Y.", "" ], [ "Tamura", "K.", "" ], [ "Yagita", "T.", "" ], [ "Yasuda", "K.", "" ], [ "Yoshida", "H. P.", "" ], [ "Wilkin", "C.", "" ] ]
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802.2332
Thierry P. Robart
Richard D. Bourgin and Thierry P. Robart
An Infinite Dimensional Approach to the Third Fundamental Theorem of Lie
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 020, 10 pages
10.3842/SIGMA.2008.020
null
math.RT math.GR
http://creativecommons.org/licenses/by-nc-sa/3.0/
We revisit the third fundamental theorem of Lie (Lie III) for finite dimensional Lie algebras in the context of infinite dimensional matrices.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 14:46:23 GMT" } ]
2008-04-25T00:00:00
[ [ "Bourgin", "Richard D.", "" ], [ "Robart", "Thierry P.", "" ] ]
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802.2333
Silvia Onofrei
John Maginnis and Silvia Onofrei
On fixed point sets and Lefschetz modules for sporadic simple groups
22 pages
Journal of Pure and Applied Algebra 213 (2009) 901-912
10.1016/j.jpaa.2008.09.011
null
math.GR math.RT
null
We consider 2-local geometries and other subgroup complexes for sporadic simple groups. For six groups, the fixed point set of a noncentral involution is shown to be equivariantly homotopy equivalent to a standard geometry for the component of the centralizer. For odd primes, fixed point sets are computed for sporadic groups having an extraspecial Sylow p-subgroup of order p^3, acting on the complex of those p-radical subgroups containing a p-central element in their centers. Vertices for summands of the associated reduced Lefschetz modules are described.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 15:13:23 GMT" } ]
2010-08-24T00:00:00
[ [ "Maginnis", "John", "" ], [ "Onofrei", "Silvia", "" ] ]
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802.2334
Vladislav Dubrovsky G
V. G. Dubrovsky, A. V. Gramolin
Gauge-invariant description of some (2+1)-dimensional integrable nonlinear evolution equations
13 pages, LaTeX, no figures
J. Phys. A: Math. Theor. 41 (2008) 275208
10.1088/1751-8113/41/27/275208
null
nlin.SI math-ph math.AP math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
New manifestly gauge-invariant forms of two-dimensional generalized dispersive long-wave and Nizhnik-Veselov-Novikov systems of integrable nonlinear equations are presented. It is shown how in different gauges from such forms famous two-dimensional generalization of dispersive long-wave system of equations, Nizhnik-Veselov-Novikov and modified Nizhnik-Veselov-Novikov equations and other known and new integrable nonlinear equations arise. Miura-type transformations between nonlinear equations in different gauges are considered.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 16:55:49 GMT" }, { "version": "v2", "created": "Fri, 20 Jun 2008 19:17:36 GMT" } ]
2008-06-20T00:00:00
[ [ "Dubrovsky", "V. G.", "" ], [ "Gramolin", "A. V.", "" ] ]
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802.2335
Tiago Jos\'e Oliveira
T. J. Oliveira, J. F. Stilck, P. Serra
Solution of a model of SAW's with multiple monomers per site on the Husimi lattice
16 pages, including 6 figures
Phys. Rev. E 77, 041103 (2008)
10.1103/PhysRevE.77.041103
null
cond-mat.stat-mech cond-mat.soft
null
We solve a model of self-avoiding walks which allows for a site to be visited up to two times by the walk on the Husimi lattice. This model is inspired in the Domb-Joyce model and was proposed to describe the collapse transition of polymers with one-site interactions only. We consider the version in which immediate self-reversals of the walk are forbidden (RF model). The phase diagram we obtain for the grand-canonical version of the model is similar to the one found in the solution of the Bethe lattice, with two distinct polymerized phases, a tricritical point and a critical endpoint.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 16:15:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Oliveira", "T. J.", "" ], [ "Stilck", "J. F.", "" ], [ "Serra", "P.", "" ] ]
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802.2336
Alex Degtyarev
Alex Degtyarev
Stable symmetries of plane sextics
null
Geometri{\ae} Dedicata, 137:1 (2008), 199--218
10.1007/s10711-008-9293-6
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We classify projective symmetries of irreducible plane sextics with simple singularities which are stable under equivariant deformations. We also outline a connection between order~2 stable symmetries and maximal trigonal curves.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 16:49:42 GMT" } ]
2008-10-24T00:00:00
[ [ "Degtyarev", "Alex", "" ] ]
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802.2337
Fr\'ed\'eric Galliano
F. Galliano
A Multiscale Study of Polycyclic Aromatic Hydrocarbon Properties in Galaxies
14 pages, 16 color figures
Proceedings of the Fourth Spitzer Conference: "The Evolving ISM in the Milky Way and Nearby Galaxies", held in Pasadena dec. 2-5 2007
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the present contribution, I summarize a systematic study of ISO and Spitzer mid-IR spectra of Galactic regions and star forming galaxies. This study quantifies the relative variations of the main aromatic features inside spatially resolved objects as well as among the integrated spectra of 50 objects. Our analysis implies that the properties of the PAHs are remarkably universal throughout our sample and at different spatial scales. In addition, the relative variations of the band ratios, as large as one order of magnitude, are mainly controled by the fraction of ionized PAHs. In particular, I show that we can rule out both the modification of the PAH size distribution and the mid-IR extinction, as an explanation of these variations. High values of the I(6.2)/I(11.3) ratio are found to be associated with the far-UV illuminated surface of PDRs, at the scale of an interstellar cloud, and associated with star formation activity, at the scale of a galaxy. Using a few well-studied Galactic regions, we provide an empirical relation between the I(6.2)/I(11.3) ratio and the ionization/recombination ratio G0/ne. Finally, I show that these trends are consistent with the detailed modeling of the PAH emission within photodissociation regions, taking into account the radiative transfer, the stochastic heating and the charge exchange between gas and dust.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 17:14:32 GMT" } ]
2008-02-19T00:00:00
[ [ "Galliano", "F.", "" ] ]
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802.2338
Michael Friedman
Michael Friedman, Mina Teicher
On non Fundamental Group Equivalent Surfaces
null
Algebr. Geom. Topol. 8 (2008) 397-433
10.2140/agt.2008.8.397
null
math.AG
http://creativecommons.org/licenses/publicdomain/
In this paper we present an example of two polarized K3 surfaces which are not Fundamental Group Equivalent (their fundamental groups of the complement of the branch curves are not isomorphic; denoted by FGE) but the fundamental groups of their related Galois covers are isomorphic. For each surface, we consider a generic projection to CP^2 and a degenerations of the surface into a union of planes - the "pillow" degeneration for the non-prime surface and the "magician" degeneration for the prime surface. We compute the Braid Monodromy Factorization (BMF) of the branch curve of each projected surface, using the related degenerations. By these factorizations, we compute the above fundamental groups. It is known that the two surfaces are not in the same component of the Hilbert scheme of linearly embedded K3 surfaces. Here we prove that furthermore they are not FGE equivalent, and thus they are not of the same Braid Monodromy Type (BMT) (which implies that they are not a projective deformation of each other
[ { "version": "v1", "created": "Sat, 16 Feb 2008 17:17:43 GMT" } ]
2014-10-01T00:00:00
[ [ "Friedman", "Michael", "" ], [ "Teicher", "Mina", "" ] ]
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802.2339
Klaus Reinsch
K. Beuermann, K. Reinsch
High-resolution spectroscopy of the intermediate polar EX Hydrae. I. Kinematic study and Roche tomography
15 pages, 15 figures, accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20079010
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
EX Hya is one of the few double-lined eclipsing cataclysmic variables that allow an accurate measurement of the binary masses. We analyze orbital phase-resolved UVES/ VLT high resolution spectroscopic observations of EX Hya with the aims of deriving the binary masses and obtaining a tomographic image of the illuminated secondary star. We present a novel method for determining the binary parameters by directly fitting an emission model of the illuminated secondary star to the phase-resolved line profiles of NaI lambda 8183/ 8195 in absorption and emission and CaII lambda 8498 in emission. The fit to the NaI and CaII line profiles, combined with the published K1, yields a white-dwarf mass M1 = 0.790 +/- 0.026 Msun, a secondary mass M2 = 0.108 +/- 0.008 Msun, and a velocity amplitude of the secondary star K2 = 432.4 +/- 4.8 km s-1. The secondary is of spectral type dM5.5 +/- 0.5 and has an absolute K-band magnitude of MK = 8.8. Its Roche radius places it on or very close to the main sequence of low-mass stars. It differs from a main sequence star by its illuminated hemisphere that faces the white dwarf. The secondary star contributes only 5% to the observed spin-phase averaged flux at 7500 A, 7.5% at 8200 A, and 37% in the K-band. We present images of the secondary star in the light of the NaI doublet and the CaII emission line derived with a simplified version of Roche tomography. We have discovered narrow spectral lines from the secondary star in EX Hya that delineate its orbital motion and allow us to derive accurate masses of both components. The primary mass significantly exceeds recently published values. The secondary is a low-mass main sequence star that displays a rich emission line spectrum on its illuminated side, but lacks chromospheric emission on its dark side.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:38:33 GMT" } ]
2008-02-19T00:00:00
[ [ "Beuermann", "K.", "" ], [ "Reinsch", "K.", "" ] ]
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802.234
Daniel Dewey
D. Dewey (1), S.A. Zhekov (2 and 3), R. McCray (2), and C.R. Canizares (1) ((1) MIT Kavli Institute, (2) JILA, University of Colorado, Boulder, (3) Space Research Institute, Sofia, Bulgaria)
Chandra HETG Spectra of SN 1987A at 20 years
12 pages, 5 figures, 1 table; accepted for publication in ApJ Letters
null
10.1086/587549
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have undertaken deep, high-resolution observations of SN 1987A at ~20 years after its explosion with the Chandra HETG and LETG spectrometers. Here we present the HETG X-ray spectra of SN 1987A having unprecedented spectral resolution and signal-to-noise in the 6 A to 20 A bandpass, which includes the H-like and He-like lines of Si, Mg, Ne, as well as O VIII lines and bright Fe XVII lines. In joint analysis with LETG data, we find that there has been a significant decrease from 2004 to 2007 in the average temperature of the highest temperature component of the shocked-plasma emission. Model fitting of the profiles of individual HETG lines yields bulk kinematic velocities of the higher-Z ions, Mg and Si, that are significantly lower than those inferred from the LETG 2004 observations.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 18:15:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Dewey", "D.", "", "2 and 3" ], [ "Zhekov", "S. A.", "", "2 and 3" ], [ "McCray", "R.", "" ], [ "Canizares", "C. R.", "" ] ]
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802.2341
Kenichi Yoshida
Kenichi Yoshida, Masayuki Yamagami
Low-frequency $K^{\pi}=0^{+}$ modes in deformed neutron-rich nuclei: Pairing- and $\beta$-vibrational modes of neutron
9 pages, 7 figures, and 1 table
Phys.Rev.C77:044312,2008
10.1103/PhysRevC.77.044312
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Low-frequency $K^{\pi}=0^{+}$ states in deformed neutron-rich nuclei are investigated by means of the quasiparticle-random-phase approximation based on the Hartree-Fock-Bogoliubov formalism in the coordinate space. We have obtained the very strongly collective $K^{\pi}=0^{+}$ modes not only in neutron-rich Mg isotope but also in Cr and Fe isotopes in N=40 region, where the onset of nuclear deformation has been discussed. It is found that the spatially extended structure of neutron quasiparticle wave functions around the Fermi level brings about a striking enhancement of the transition strengths. It is also found that the fluctuation of the pairing field plays an important role in generating coherence among two-quasiparticle excitations of neutron.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 18:13:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Yoshida", "Kenichi", "" ], [ "Yamagami", "Masayuki", "" ] ]
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802.2342
Pedro Lopes
Pedro Lopes
Partial profiles of quasi-complete graphs
21 pages, 5 figures
J. Integer Seq. 19 (2016), Article 16.2.5
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We enumerate graph homomorphisms to quasi-complete graphs, i.e., graphs obtained from complete graphs by removing one edge. The source graphs are complete graphs, quasi-complete graphs, cycles, paths, wheels and broken wheels. These enumerations give rise to sequences of integers with two indices; one of the indices is the number of vertices of the source graph, and the other index is the number of vertices of the target graph.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 18:11:14 GMT" }, { "version": "v2", "created": "Sat, 23 Jan 2016 05:53:34 GMT" } ]
2016-01-26T00:00:00
[ [ "Lopes", "Pedro", "" ] ]
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802.2343
Mircea Neagu
Ileana Rodica Nicola, Mircea Neagu
Jet Riemann-Lagrange Geometry and Some Applications in Theoretical Biology
14 pages
Journal of Dynamical Systems and Geometric Theories, Vol. 6, No. 1 (2008), 13-25.
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of this paper is to construct a natural Riemann-Lagrange differential geometry on 1-jet spaces, in the sense of nonlinear connections, generalized Cartan connections, d-torsions, d-curvatures, jet electromagnetic fields and jet electromagnetic Yang-Mills energies, starting from some given nonlinear evolution ODEs systems modelling biologic phenomena like the cancer cell population model or the infection by human immunodeficiency virus-type 1 (HIV-1) model.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 18:44:50 GMT" } ]
2008-12-29T00:00:00
[ [ "Nicola", "Ileana Rodica", "" ], [ "Neagu", "Mircea", "" ] ]
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802.2344
Vladimir Matveev
Vladimir S. Matveev
Two-dimensional metrics admitting precisely one projective vector field
42 pages, no figures. The changes w.r.t. (v1) are the following: A paragraph with explanations was added in the introduction, the title was changed, misprints were corrected, references were updated, appendix (by A. Bolsinov, V. Matveev and G. Pucacco) is now incorporated in the paper (it was separately posted as arXiv:0802.2346v1). The paper is accepted to Math. Ann
null
null
null
math.DG math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a complete list of two-dimensional metrics that admit an essential projective vector field. This solves a problem explicitly posed by Sophus Lie in 1882.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 19:11:36 GMT" }, { "version": "v2", "created": "Wed, 21 Oct 2009 11:53:03 GMT" } ]
2009-10-21T00:00:00
[ [ "Matveev", "Vladimir S.", "" ] ]
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802.2345
Ioannis Chatzigeorgiou
Ioannis Chatzigeorgiou, Ian J. Wassell and Rolando Carrasco
On the Frame Error Rate of Transmission Schemes on Quasi-Static Fading Channels
5 pages, 4 figures, Proceedings of the 42nd Conference on Information Sciences and Systems, Princeton, USA, March 19-21, 2008
null
10.1109/CISS.2008.4558591
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is known that the frame error rate of turbo codes on quasi-static fading channels can be accurately approximated using the convergence threshold of the corresponding iterative decoder. This paper considers quasi-static fading channels and demonstrates that non-iterative schemes can also be characterized by a similar threshold based on which their frame error rate can be readily estimated. In particular, we show that this threshold is a function of the probability of successful frame detection in additive white Gaussian noise, normalized by the squared instantaneous signal-to-noise ratio. We apply our approach to uncoded binary phase shift keying, convolutional coding and turbo coding and demonstrate that the approximated frame error rate is within 0.4 dB of the simulation results. Finally, we introduce performance evaluation plots to explore the impact of the frame size on the performance of the schemes under investigation.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 18:58:00 GMT" } ]
2022-03-08T00:00:00
[ [ "Chatzigeorgiou", "Ioannis", "" ], [ "Wassell", "Ian J.", "" ], [ "Carrasco", "Rolando", "" ] ]
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802.2346
Vladimir Matveev
Alexei V. Bolsinov, Vladimir S. Matveev, Giuseppe Pucacco
Appendix: Dini theorem for pseudo-Riemannian metrics
6 pages. This is an appendix to the paper "A solution of another problem of Sophus Lie: 2-dimensional metrics admitting precisely one projective vector field" of V. Matveev
null
null
null
math.DG math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct local normal forms of pseudo-Riemannian projectively equivalent 2-dimensional metrics.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:12:00 GMT" } ]
2008-02-19T00:00:00
[ [ "Bolsinov", "Alexei V.", "" ], [ "Matveev", "Vladimir S.", "" ], [ "Pucacco", "Giuseppe", "" ] ]
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802.2347
Dorin Ervin Dutkay
Dorin Ervin Dutkay and Palle E.T. Jorgensen
Spectral Theory for Discrete Lapacians
null
null
null
null
math-ph math.MP math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give the spectral representation for a class of selfadjoint discrete graph Laplacians $\Delta$, with $\Delta$ depending on a chosen graph $G$ and a conductance function $c$ defined on the edges of $G$. We show that the spectral representations for $\Delta$ fall in two model classes, (1) tree-graphs with $N$-adic branching laws, and (2) lattice graphs. We show that the spectral theory of the first class may be computed with the use of rank-one perturbations of the real part of the unilateral shift, while the second is analogously built up with the use of the bilateral shift. We further analyze the effect on spectra of the conductance function $c$: How the spectral representation of $\Delta$ depends on $c$. Using $\Delta_G$, we introduce a resistance metric, and we show that it embeds isometrically into an energy Hilbert space. We introduce an associated random walk and we calculate return probabilities, and a path counting number.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 19:28:21 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 17:57:22 GMT" }, { "version": "v3", "created": "Fri, 21 Mar 2008 20:44:51 GMT" }, { "version": "v4", "created": "Thu, 22 May 2008 17:38:17 GMT" }, { "version": "v5", "created": "Mon, 2 Jun 2008 15:13:51 GMT" } ]
2008-06-02T00:00:00
[ [ "Dutkay", "Dorin Ervin", "" ], [ "Jorgensen", "Palle E. T.", "" ] ]
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802.2348
Itay Hen
Itay Hen, Marek Karliner
Spontaneous Breaking of Rotational Symmetry in Rotating Solitons - a Toy Model of Excited Nucleons with High Angular Momentum
RevTex, 9 pages, 9 figures. Added content
Phys.Rev.D77:116002,2008
10.1103/PhysRevD.77.116002
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the phenomenon of spontaneous breaking of rotational symmetry (SBRS) in the rotating solutions of two types of baby Skyrme models. In the first the domain is a two-sphere and in the other, the Skyrmions are confined to the interior of a unit disk. Numerical full-field results show that when the angular momentum of the Skyrmions increases above a certain critical value, the rotational symmetry of the solutions is broken and the minimal energy configurations become less symmetric. We propose a possible mechanism as to why SBRS is present in the rotating solutions of these models, while it is not observed in the `usual' baby Skyrme model. Our results might be relevant for a qualitative understanding of the non-spherical deformation of excited nucleons with high orbital angular momentum.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 19:48:16 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 14:27:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Hen", "Itay", "" ], [ "Karliner", "Marek", "" ] ]
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802.2349
John B. Little
John B. Little
Algebraic geometry codes from higher dimensional varieties
26 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is a general survey of literature on Goppa-type codes from higher dimensional algebraic varieties. The construction and several techniques for estimating the minimum distance are described first. Codes from various classes of varieties, including Hermitian hypersurfaces, Grassmannians, flag varieties, ruled surfaces over curves, and Deligne-Lusztig varieties are considered. Connections with the theories of toric codes and order domains are also briefly indicated.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 23:45:47 GMT" } ]
2008-02-19T00:00:00
[ [ "Little", "John B.", "" ] ]
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802.235
Andrew A. Geraci
Andrew A. Geraci, Sylvia J. Smullin, David M. Weld, John Chiaverini, and Aharon Kapitulnik
Improved constraints on non-Newtonian forces at 10 microns
12 pages, 9 figures, accepted for publication in PRD. Minor changes, replaced and corrected Figs 4,5,8
Phys.Rev.D78:022002,2008
10.1103/PhysRevD.78.022002
null
hep-ex astro-ph cond-mat.other hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several recent theories suggest that light moduli or particles in "large" extra dimensions could mediate macroscopic forces exceeding gravitational strength at length scales below a millimeter. Such new forces can be parameterized as a Yukawa-type correction to the Newtonian potential of strength $\alpha$ relative to gravity and range $\lambda$. To extend the search for such new physics we have improved our apparatus utilizing cryogenic micro-cantilevers capable of measuring attonewton forces, which now includes a switchable magnetic force for calibration. Our most recent experimental constraints on Yukawa-type deviations from Newtonian gravity are more than three times as stringent as our previously published results, and represent the best bound in the range of 5 - 15 microns, with a 95 percent confidence exclusion of forces with $|\alpha| > 14,000$ at $\lambda$ = 10 microns.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 20:48:41 GMT" }, { "version": "v2", "created": "Mon, 30 Jun 2008 03:22:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Geraci", "Andrew A.", "" ], [ "Smullin", "Sylvia J.", "" ], [ "Weld", "David M.", "" ], [ "Chiaverini", "John", "" ], [ "Kapitulnik", "Aharon", "" ] ]
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802.2351
Jens Koch
Jens Koch, Karyn Le Hur
Discontinuous current-phase relations in small 1D Josephson junction arrays
4 pages, 4 figures
Phys. Rev. Lett. 101, 097007 (2008)
10.1103/PhysRevLett.101.097007
null
cond-mat.mes-hall cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the Josephson effect in small one-dimensional (1D) Josephson junction arrays. For weak Josephson tunneling, topologically different regions in the charge-stability diagram generate distinct current-phase relationships (I$\Phi$). We present results for a three-junction system in the vicinity of charge degeneracy lines and triple points. We explain the generalization to larger arrays, show that discontinuities of the I$\Phi$ at phase $\pi$ persist and that, at maximum degeneracy, the problem can be mapped to a tight-binding model providing analytical results for arbitrary system size.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 21:31:34 GMT" } ]
2008-08-28T00:00:00
[ [ "Koch", "Jens", "" ], [ "Hur", "Karyn Le", "" ] ]
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802.2352
Joachim Toft jto
Joachim Toft, Francesco Concetti, Gianluca Garello
Trace Ideals for Fourier Integral Operators with Non-Smooth Symbols III
34 pages
null
null
null
math.AP math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider Fourier integral operators with symbols in modulation spaces and non-smooth phase functions whose second orders of derivatives belong to certain types of modulation space. We establish continuity and Schatten-von Neumann properties of such operators when acting on modulation spaces.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 21:47:34 GMT" } ]
2008-02-19T00:00:00
[ [ "Toft", "Joachim", "" ], [ "Concetti", "Francesco", "" ], [ "Garello", "Gianluca", "" ] ]
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802.2353
Adrian Ioana
Ionut Chifan and Adrian Ioana
Ergodic Subequivalence Relations Induced by a Bernoulli Action
16 pages
Geometric and Functional Analysis 20 (2010), 53-67
10.1007/s00039-010-0058-7
null
math.DS math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\Gamma$ be a countable group and denote by $\Cal S$ the equivalence relation induced by the Bernoulli action $\Gamma\curvearrowright [0,1]^{\Gamma}$, where $[0,1]^{\Gamma}$ is endowed with the product Lebesgue measure. We prove that for any subequivalence relation $\Cal R$ of $\Cal S$, there exists a partition $\{X_i\}_{i\geq 0}$ of $[0,1]^{\Gamma}$ with $\Cal R$-invariant measurable sets such that $\Cal R_{|X_0}$ is hyperfinite and $\Cal R_{|X_i}$ is strongly ergodic (hence ergodic), for every $i\geq 1$.
[ { "version": "v1", "created": "Sat, 16 Feb 2008 22:30:48 GMT" } ]
2018-02-27T00:00:00
[ [ "Chifan", "Ionut", "" ], [ "Ioana", "Adrian", "" ] ]
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802.2354
Lilia P. Bassino
Lilia P. Bassino (1), Tom Richtler (2) and Boris Dirsch (2) ((1) Facultad de Ciencias Astronomicas y Geofisicas, Universidad Nacional de La Plata, Argentina and IALP-CONICET, (2) Universidad de Concepcion, Chile)
VLT photometry in the Antlia Cluster: the giant ellipticals NGC 3258 and NGC 3268 and their globular cluster systems
13 pages, 16 figures. Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13115.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a deep VLT photometry in the regions surrounding the two dominant galaxies of the Antlia cluster, the giant ellipticals NGC 3258 and NGC 3268. We construct the luminosity functions of their globular cluster systems (GCSs) and determine their distances through the turn-over magnitudes. These distances are in good agreement with those obtained by the SBF method. There is some, but not conclusive, evidence that the distance to NGC 3268 is larger by several Mpc. The GCSs colour distributions are bimodal but the brightest globular clusters (GCs) show a unimodal distribution with an intermediate colour peak. The radial distributions of both GCSs are well fitted by de Vaucouleurs laws up to 5 arcmin. Red GCs present a steeper radial density profile than the blue GCs, and follow closely the galaxies' brightness profiles. Total GC populations are estimated to be about 6000+/-150 GCs in NGC 3258 and 4750+/-150 GCs in NGC 3268. We discuss the possible existence of GCs in a field located between the two giant galaxies (intracluster GCs). Their luminosity functions and number densities are consistent with the two GCSs overlapping in projection.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 00:18:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Bassino", "Lilia P.", "" ], [ "Richtler", "Tom", "" ], [ "Dirsch", "Boris", "" ] ]
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802.2355
James Degnan
James H. Degnan
Properties of Consensus Methods for Inferring Species Trees from Gene Trees
24 pages, 2 tables, 8 figures
null
null
null
q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consensus methods provide a useful strategy for combining information from a collection of gene trees. An important application of consensus methods is to combine gene trees to estimate a species tree. To investigate the theoretical properties of consensus trees that would be obtained from large numbers of loci evolving according to a basic evolutionary model, we construct consensus trees from independent gene trees that occur in proportion to gene tree probabilities derived from coalescent theory. We consider majority-rule, rooted triple (R*), and greedy consensus trees constructed from known gene trees, both in the asymptotic case as numbers of gene trees approach infinity and for finite numbers of genes. Our results show that for some combinations of species tree branch lengths, increasing the number of independent loci can make the majority-rule consensus tree more likely to be at least partially unresolved and the greedy consensus tree less likely to match the species tree. However, the probability that the R* consensus tree has the species tree topology approaches 1 as the number of gene trees approaches infinity. Although the greedy consensus algorithm can be the quickest to converge on the correct species tree when increasing the number of gene trees, it can also be positively misleading. The majority-rule consensus tree is not a misleading estimator of the species tree topology, and the R* consensus tree is a statistically consistent estimator of the species tree topology. Our results therefore suggest a method for using multiple loci to infer the species tree topology, even when it is discordant with the most likely gene tree.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 01:21:28 GMT" } ]
2008-02-19T00:00:00
[ [ "Degnan", "James H.", "" ] ]
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802.2356
Ignacio Uriarte-Tuero
Tomi Nieminen, Ignacio Uriarte-Tuero
Quasiconformal mappings and singularity of boundary distortion
13 pages, 1 figure
null
null
null
math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extend a well-known theorem by Jones and Makarov [JM] on the singularity of boundary distortion of planar conformal mappings. We use a different technique to recover the previous result and, moreover, generalize the result for quasiconformal mappings of the unit ball $\B^n\subset \mathbb{R}^n$, $n\ge 2$. We also establish an estimate on the Hausdorff (gauge) dimension of the boundary of the image domain outside an exceptional set of given size on the sphere $\partial \B^n$. Furthermore, we show that this estimate is essentially sharp. [JM] P. W. Jones and N. Makarov: Density properties of harmonic measure. Ann. Math. 142 (1995), 427--455.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 02:22:55 GMT" } ]
2008-02-19T00:00:00
[ [ "Nieminen", "Tomi", "" ], [ "Uriarte-Tuero", "Ignacio", "" ] ]
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802.2357
Hassan Raza
Hassan Raza and Edwin C. Kan
An atomistic quantum transport solver with dephasing for field-effect transistors
to appear in Journal of Computational Electronics
J. Comp. Elec. 7, 423 (2008).
10.1007/s10825-008-0231-5
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Extended Huckel theory (EHT) along with NEGF (Non-equilibrium Green's function formalism) has been used for modeling coherent transport through molecules. Incorporating dephasing has been proposed to theoretically reproduce experimental characteristics for such devices. These elastic and inelastic dephasing effects are expected to be important in quantum devices with the feature size around 10nm, and hence an efficient and versatile solver is needed. This model should have flexibility to be applied to a wide range of nano-scale devices, along with 3D electrostatics, for arbitrary shaped contacts and surface roughness. We report one such EHT-NEGF solver with dephasing by self-consistent Born approximation (SCBA). 3D electrostatics is included using a finite-element scheme. The model is applied to a single wall carbon nanotube (CNT) cross-bar structure with a C60 molecule as the active channel. Without dephasing, a negative differential resistance (NDR) peak appears when the C60 lowest unoccupied molecular orbital level crosses a van Hove singularity in the 1D density of states of the metallic CNTs acting as contacts. This NDR diminishes with increasing dephasing in the channel as expected.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 04:02:57 GMT" } ]
2008-08-28T00:00:00
[ [ "Raza", "Hassan", "" ], [ "Kan", "Edwin C.", "" ] ]
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802.2358
Rong-Jia Yang
Rong-Jia Yang, Shuang Nan Zhang, Yuan Liu
Constraints on the generalized tachyon field models from latest observational data
21pages, 14 figures
JCAP 0801:017,2008
10.1088/1475-7516/2008/01/017
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider constraints on generalized tachyon field (GTF) models from latest observational data (including 182 gold SNIa data, the shift parameter, and the acoustic scale). We obtain at 68.3% confidence level $\Omega_{\rm m}=0.37\pm0.01$, $k_0=0.09^{+0.04}_{-0.03}$, $\alpha=1.8^{+7.4}_{-0.7}$ (the best-fit values of the parameters) and $z_{q=0}\sim 0.47-0.51$ (the transitional redshift) for GTF as dark energy component only; $k_0=0.21^{+0.20}_{-0.18}$, $\alpha=0.57\pm0.01$ and $z_{q=0}\sim 0.49-0.68$ for GTF as unification of dark energy and dark matter. In both cases, GTF evolves like dark matter in the early universe. By applying model-comparison statistics and test with independent $H(z)$ data, we find GTF dark energy scenario is favored over the $\Lambda$CDM model, and the $\Lambda$CDM model is favored over GTF unified dark matter by the combined data. For GTF as dark energy component, the fluctuations of matter density is consistent with the growth of linear density perturbations. For GTF unified dark matter, the growth of GTF density fluctuations grow more slowly for $a\to1$, meaning GTF do not behave as classical $\Lambda$CDM scenarios.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 04:05:52 GMT" } ]
2009-06-25T00:00:00
[ [ "Yang", "Rong-Jia", "" ], [ "Zhang", "Shuang Nan", "" ], [ "Liu", "Yuan", "" ] ]
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802.2359
Shulin Li
S.-L. Li, D.N.C. Lin, and X.-W. Liu
Extent of pollution in planet-bearing stars
25 pages, 8 figures, submitted to ApJ
null
10.1086/591122
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
(abridged) Search for planets around main-sequence (MS) stars more massive than the Sun is hindered by their hot and rapidly spinning atmospheres. This obstacle has been sidestepped by radial-velocity surveys of those stars on their post-MS evolutionary track (G sub-giant and giant stars). Preliminary observational findings suggest a deficiency of short-period hot Jupiters around the observed post MS stars, although the total fraction of them with known planets appears to increase with their mass. Here we consider the possibility that some very close- in gas giants or a population of rocky planets may have either undergone orbital decay or been engulfed by the expanding envelope of their intermediate-mass host stars. If such events occur during or shortly after those stars' main sequence evolution when their convection zone remains relatively shallow, their surface metallicity can be significantly enhanced by the consumption of one or more gas giants. We show that stars with enriched veneer and lower-metallicity interior follow slightly modified evolution tracks as those with the same high surface and interior metallicity. As an example, we consider HD149026, a marginal post MS 1.3 Msun star. We suggest that its observed high (nearly twice solar) metallicity may be confined to the surface layer as a consequence of pollution by the accretion of either a planet similar to its known 2.7-day-period Saturn-mass planet, which has a 70 Mearth compact core, or a population of smaller mass planets with a comparable total amount of heavy elements. It is shown that an enhancement in surface metallicity leads to a reduction in effective temperature, in increase in radius and a net decrease in luminosity. The effects of such an enhancement are not negligible in the determinations of the planet's radius based on the transit light curves.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 04:15:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "S. -L.", "" ], [ "Lin", "D. N. C.", "" ], [ "Liu", "X. -W.", "" ] ]
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802.236
Vaneet Aggarwal
Vaneet Aggarwal, Amir Bennatan and A. Robert Calderbank
On Maximizing Coverage in Gaussian Relay Networks
17 pages,8 figures, Submitted to IEEE Trans. Inf. Th, Oct. 2007
IEEE Trans. Information Theory, vol.55, no.6, pp. 2518-2536 (Jun. 2009)
10.1109/TIT.2009.2018337
null
cs.IT math.IT
http://creativecommons.org/licenses/by-nc-sa/3.0/
Results for Gaussian relay channels typically focus on maximizing transmission rates for given locations of the source, relay and destination. We introduce an alternative perspective, where the objective is maximizing coverage for a given rate. The new objective captures the problem of how to deploy relays to provide a given level of service to a particular geographic area, where the relay locations become a design parameter that can be optimized. We evaluate the decode and forward (DF) and compress and forward (CF) strategies for the relay channel with respect to the new objective of maximizing coverage. When the objective is maximizing rate, different locations of the destination favor different strategies. When the objective is coverage for a given rate, and the relay is able to decode, DF is uniformly superior in that it provides coverage at any point served by CF. When the channel model is modified to include random fading, we show that the monotone ordering of coverage regions is not always maintained. While the coverage provided by DF is sensitive to changes in the location of the relay and the path loss exponent, CF exhibits a more graceful degradation with respect to such changes. The techniques used to approximate coverage regions are new and may be of independent interest.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 04:38:22 GMT" } ]
2017-08-04T00:00:00
[ [ "Aggarwal", "Vaneet", "" ], [ "Bennatan", "Amir", "" ], [ "Calderbank", "A. Robert", "" ] ]
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802.2361
Shigeki Inoue
Shigeki M. Inoue, Masafumi Noguchi
The galactic stellar nucleation by globular cluster interactions in dwarf galaxies
2pages,3figures: proceedings of The 1st Subaru International Conference, "Panoramic Views of Galaxy Formation and Evolution" (Hayama, Japan, 11-16 Dec 2007)
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dinamical Friction Problem is a long-standing dilemma about globular clusters(hereafter,GCs) belonging to dwarf galaxies. The GCs are strongly affected by dynamical friction in dwarf galaxies, and presumed to fall into the galactic center. But GCs do exist in dwarf galaxies. Recentry, a new solution was proposed. If dwarf galaxies have a cored dark matter halo, in which case the effect of dynamical friction will be weaken considerably, and GCs are able to survive beyond the age of the universe. In this study, we discussed why does a constant density cored halo cease dynamical friction, by means of N-body simulations.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 07:25:10 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 03:47:19 GMT" } ]
2009-09-29T00:00:00
[ [ "Inoue", "Shigeki M.", "" ], [ "Noguchi", "Masafumi", "" ] ]
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802.2362
Renat Sultanov
Renat A. Sultanov, Dennis Guster, Brent Engelbrekt, and Richard Blankenbecler
3D Computer Simulations of Pulsatile Human Blood Flows in Vessels and in the Aortic Arch: Investigation of Non-Newtonian Characteristics of Human Blood
8 pages, 5 figures
null
null
null
physics.comp-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Methods of Computational Fluid Dynamics are applied to simulate pulsatile blood flow in human vessels and in the aortic arch. The non-Newtonian behaviour of the human blood is investigated in simple vessels of actual size. A detailed time-dependent mathematical convergence test has been carried out. The realistic pulsatile flow is used in all simulations. Results of computer simulations of the blood flow in vessels of two different geometries are presented. For pressure, strain rate and velocity component distributions we found significant disagreements between our results obtained with realistic non-Newtonian treatment of human blood and widely used method in literature: a simple Newtonian approximation. A significant increase of the strain rate and, as a result, wall sear stress distribution, is found in the region of the aortic arch. We consider this result as theoretical evidence that supports existing clinical observations and those models not using non-Newtonian treatment underestimate the risk of disruption to the human vascular system.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 05:51:22 GMT" } ]
2008-02-19T00:00:00
[ [ "Sultanov", "Renat A.", "" ], [ "Guster", "Dennis", "" ], [ "Engelbrekt", "Brent", "" ], [ "Blankenbecler", "Richard", "" ] ]
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802.2363
Gernot Maier
V.A. Acciari, M. Beilicke, G. Blaylock, S.M. Bradbury, J.H. Buckley, V. Bugaev, Y. Butt, K.L. Byrum, O. Celik, A. Cesarini, L. Ciupik, Y.C.K. Chow, P. Cogan, P. Colin, W. Cui, M.K. Daniel, C. Duke, T. Ergin, A.D. Falcone, S.J. Fegan, J.P. Finley, P. Fortin, L.F. Fortson, D. Gall, K. Gibbs, G.H. Gillanders, J. Grube R. Guenette, D. Hanna, E. Hays, J. Holder, D. Horan, S.B. Hughes, C.M. Hui, T.B. Humensky, P. Kaaret, D.B. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M.J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, T. Nagai, R.A. Ong, D. Pandel, J.S. Perkins, F. Pizlo, M. Pohl, J. Quinn, K. Ragan, P.T. Reynolds, H.J. Rose, M. Schroedter, G.H. Sembroski, A.W. Smith, D. Steele, S.P. Swordy, J.A. Toner, L. Valcarcel, V.V. Vassiliev, R. Wagner, S.P. Wakely, J.E. Ward, T.C. Weekes, A. Weinstein, R.J. White, D.A. Williams, S.A. Wissel, M. Wood, B. Zitzer
VERITAS Observations of the gamma-Ray Binary LS I +61 303
accepted for publication in The Astrophysical Journal
null
10.1086/587736
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycles (between September 2006 and February 2007) with the VERITAS array of imaging air-Cherenkov telescopes. A signal of gamma-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Gamma=2.40+-0.16_stat+-0.2_sys and a flux above 300 GeV corresponding to 15-20% of the flux from the Crab Nebula.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 20:55:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Acciari", "V. A.", "" ], [ "Beilicke", "M.", "" ], [ "Blaylock", "G.", "" ], [ "Bradbury", "S. M.", "" ], [ "Buckley", "J. H.", "" ], [ "Bugaev", "V.", "" ], [ "Butt", "Y.", "" ], [ "Byrum", "K. L.", "" ], [ "Celik", "O.", "" ], [ "Cesarini", "A.", "" ], [ "Ciupik", "L.", "" ], [ "Chow", "Y. C. K.", "" ], [ "Cogan", "P.", "" ], [ "Colin", "P.", "" ], [ "Cui", "W.", "" ], [ "Daniel", "M. K.", "" ], [ "Duke", "C.", "" ], [ "Ergin", "T.", "" ], [ "Falcone", "A. D.", "" ], [ "Fegan", "S. J.", "" ], [ "Finley", "J. P.", "" ], [ "Fortin", "P.", "" ], [ "Fortson", "L. F.", "" ], [ "Gall", "D.", "" ], [ "Gibbs", "K.", "" ], [ "Gillanders", "G. H.", "" ], [ "Guenette", "J. Grube R.", "" ], [ "Hanna", "D.", "" ], [ "Hays", "E.", "" ], [ "Holder", "J.", "" ], [ "Horan", "D.", "" ], [ "Hughes", "S. B.", "" ], [ "Hui", "C. M.", "" ], [ "Humensky", "T. B.", "" ], [ "Kaaret", "P.", "" ], [ "Kieda", "D. B.", "" ], [ "Kildea", "J.", "" ], [ "Konopelko", "A.", "" ], [ "Krawczynski", "H.", "" ], [ "Krennrich", "F.", "" ], [ "Lang", "M. J.", "" ], [ "LeBohec", "S.", "" ], [ "Lee", "K.", "" ], [ "Maier", "G.", "" ], [ "McCann", "A.", "" ], [ "McCutcheon", "M.", "" ], [ "Millis", "J.", "" ], [ "Moriarty", "P.", "" ], [ "Mukherjee", "R.", "" ], [ "Nagai", "T.", "" ], [ "Ong", "R. A.", "" ], [ "Pandel", "D.", "" ], [ "Perkins", "J. S.", "" ], [ "Pizlo", "F.", "" ], [ "Pohl", "M.", "" ], [ "Quinn", "J.", "" ], [ "Ragan", "K.", "" ], [ "Reynolds", "P. T.", "" ], [ "Rose", "H. J.", "" ], [ "Schroedter", "M.", "" ], [ "Sembroski", "G. H.", "" ], [ "Smith", "A. W.", "" ], [ "Steele", "D.", "" ], [ "Swordy", "S. P.", "" ], [ "Toner", "J. A.", "" ], [ "Valcarcel", "L.", "" ], [ "Vassiliev", "V. V.", "" ], [ "Wagner", "R.", "" ], [ "Wakely", "S. P.", "" ], [ "Ward", "J. E.", "" ], [ "Weekes", "T. C.", "" ], [ "Weinstein", "A.", "" ], [ "White", "R. J.", "" ], [ "Williams", "D. A.", "" ], [ "Wissel", "S. A.", "" ], [ "Wood", "M.", "" ], [ "Zitzer", "B.", "" ] ]
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802.2364
Doron Cohen
Itamar Sela, Doron Cohen
Quantum Stirring in low dimensional devices
6 pages, 5 figures, improved version
Phys. Rev. B 77, 245440 (2008)
10.1103/PhysRevB.77.245440
null
cond-mat.mes-hall quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A circulating current can be induced in the Fermi sea by displacing a scatterer, or more generally by integrating a quantum pump into a closed circuit. The induced current may have either the same or the opposite sense with respect to the "pushing" direction of the pump. We work out explicit expressions for the associated geometric conductance using the Kubo-Dirac monopoles picture, and illuminate the connection with the theory of adiabatic passage in multiple path geometry.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 06:45:03 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 06:05:21 GMT" } ]
2008-06-30T00:00:00
[ [ "Sela", "Itamar", "" ], [ "Cohen", "Doron", "" ] ]
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802.2365
Reinabelle Reyes
Reinabelle Reyes, Rachel Mandelbaum, Christopher M. Hirata, Neta Bahcall, Uros Seljak
Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements
15 pages, 8 figures, accepted for publication in MNRAS, corrected typo in values of a_L after Eq. 17b
Mon.Not.Roy.Astron.Soc.390:1157-1169,2008
10.1111/j.1365-2966.2008.13818.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop an improved mass tracer for clusters of galaxies from optically observed parameters, and calibrate the mass relation using weak gravitational lensing measurements. We employ a sample of ~ 13,000 optically-selected clusters from the Sloan Digital Sky Survey (SDSS) maxBCG catalog, with photometric redshifts in the range 0.1-0.3. The optical tracers we consider are cluster richness, cluster luminosity, luminosity of the brightest cluster galaxy (BCG), and combinations of these parameters. We measure the weak lensing signal around stacked clusters as a function of the various tracers, and use it to determine the tracer with the least amount of scatter. We further use the weak lensing data to calibrate the mass normalization. We find that the best mass estimator for massive clusters is a combination of cluster richness, N_{200}, and the luminosity of the brightest cluster galaxy, L_{BCG}: M_{200\bar{\rho}} = (1.27 +/- 0.08) (N_{200}/20)^{1.20 +/- 0.09} (L_{BCG}/\bar{L}_{BCG}(N_{200}))^{0.71 +/- 0.14} \times 10^{14} h^{-1} M_sun, where $\bar{L}_{BCG}(N_{200})$ is the observed mean BCG luminosity at a given richness. This improved mass tracer will enable the use of galaxy clusters as a more powerful tool for constraining cosmological parameters.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 06:51:40 GMT" }, { "version": "v2", "created": "Sat, 16 Aug 2008 04:13:21 GMT" }, { "version": "v3", "created": "Mon, 9 Nov 2009 16:08:19 GMT" } ]
2009-11-09T00:00:00
[ [ "Reyes", "Reinabelle", "" ], [ "Mandelbaum", "Rachel", "" ], [ "Hirata", "Christopher M.", "" ], [ "Bahcall", "Neta", "" ], [ "Seljak", "Uros", "" ] ]
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802.2366
Keitaro Nagata
K. Nagata, A. Hosaka
Structure of the Nucleon and Roper Resonance with Diquark Correlations
To appear in the proceedings of Chiral 07, Osaka, Japan, November 13-16, 2007. 4pages, 4figures
Mod.Phys.Lett.A23:2397-2400,2008
10.1142/S0217732308029460
null
hep-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
We investigate the electric form factors of the nucleon and Roper resonance using a quark-diquark model. We find that the charge radii of the nucleon and Roper resonance are almost the same in size.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 07:48:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Nagata", "K.", "" ], [ "Hosaka", "A.", "" ] ]
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802.2367
Robert R. Tucci
Robert R. Tucci
QuanFou, QuanGlue, QuanOracle and QuanShi, Four Special Purpose Quantum Compilers
11 pages (files: 1 .tex, 2 .sty, 7 .pdf)
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces QuanFou v1.1, QuanGlue v1.1, QuanOracle v1.1, QuanShi v1.1, four Java applications available for free. (Source code included in the distribution.) Each application compiles a different kind of input quantum evolution operator. The applications output a quantum circuit that equals the input evolution operator.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:37:51 GMT" } ]
2008-02-19T00:00:00
[ [ "Tucci", "Robert R.", "" ] ]
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802.2368
Hyun-Chul Kim
Hyun-Chul Kim, Tim Ledwig, and Klaus Goeke
Vector and axial-vector structures of the Theta^+
5 pages. No figure. Final version. A talk presented at International Workshop Chiral07, Osaka, Japan, 13-16 Nov 2007
Mod.Phys.Lett.A23:2238-2241,2008
10.1142/S0217732308029101
INHA-NTG-03/2008
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present in this talk recent results of the vector and axial-vector transitions of the nucleon to the pentaquark baryon Theta^{+}, based on the SU(3) chiral quark-soliton model. The results are summarized as follows: K^{*}-N-Theta vector and tensor coupling constants turn out to be g_{K^{*}N Theta} = 0.81 and f_{K^{*}N Theta}=0.84, respectively, and the KN Theta axial-vector coupling constant to be g_{A}^* = 0.05. As a result, the total decay width for Theta^+ to NK becomes very small: Gamma_{Theta -> NK} = 0.71 MeV, which is consistent with the DIANA result Gamma_{Theta -> NK}=0.36 +- 0.11 MeV.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:27:19 GMT" }, { "version": "v2", "created": "Fri, 14 Mar 2008 12:38:52 GMT" }, { "version": "v3", "created": "Fri, 9 May 2008 12:09:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Kim", "Hyun-Chul", "" ], [ "Ledwig", "Tim", "" ], [ "Goeke", "Klaus", "" ] ]
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802.2369
Adam Nowak
Adam Nowak and Peter Sj\"ogren
Riesz transforms for Jacobi expansions
24 pages; the paper will appear in J. Anal. Math. (2008)
J. Anal. Math. 104 (2008), 341-369.
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We define and study Riesz transforms and conjugate Poisson integrals associated with multi-dimensional Jacobi expansions.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:40:44 GMT" } ]
2008-10-14T00:00:00
[ [ "Nowak", "Adam", "" ], [ "Sjögren", "Peter", "" ] ]
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802.237
Robert R. Tucci
Robert R. Tucci
Java Application that Outputs Quantum Circuit for Some NAND Formula Evaluators
10 pages (files: 1 .tex, 1 .sty, 3 .pdf)
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces QuanFruit v1.1, a Java application available for free. (Source code included in the distribution.) Recently, Farhi-Goldstone-Gutmann (FGG) wrote a paper arXiv:quant-ph/0702144 that proposes a quantum algorithm for evaluating NAND formulas. QuanFruit outputs a quantum circuit for the FFG algorithm.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:47:46 GMT" } ]
2008-02-19T00:00:00
[ [ "Tucci", "Robert R.", "" ] ]
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802.2371
Pierre Comon
P. Comon and J. ten Berge
Generic and Typical Ranks of Three-Way Arrays
null
null
null
I3S report ISRN I3S/RR-2006-29-FR
cs.OH cs.MS
http://creativecommons.org/licenses/by-nc-sa/3.0/
The concept of tensor rank, introduced in the twenties, has been popularized at the beginning of the seventies. This has allowed to carry out Factor Analysis on arrays with more than two indices. The generic rank may be seen as an upper bound to the number of factors that can be extracted from a given tensor. We explain in this short paper how to obtain numerically the generic rank of tensors of arbitrary dimensions, and compare it with the rare algebraic results already known at order three. In particular, we examine the cases of symmetric tensors, tensors with symmetric matrix slices, or tensors with free entries.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:48:07 GMT" } ]
2008-02-19T00:00:00
[ [ "Comon", "P.", "" ], [ "Berge", "J. ten", "" ] ]
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802.2372
Toru Kojo
Toru Kojo and Daisuke Jido
Sigma meson in pole-dominated QCD sum rules
18 pages, 15 figures
Phys.Rev.D78:114005,2008
10.1103/PhysRevD.78.114005
YITP-08-8
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The properties of $\sigma$(600) meson are studied using the QCD sum rules (QSR) for the tetraquark operators. In the SU(3) chiral limit, we investigate separately SU(3) singlet and octet tetraquark states as constituents of the $\sigma$ meson, and discuss their roles for the classification of the light scalar nonets, $\sigma, f_0, a_0$, and $\kappa$, as candidates of tetraquark states. All our analyses are performed in the the suitable Borel window which is indispensable to avoid the {\it pseudo peak} artifacts outside of the Borel window. The acceptably wide Borel window originates after preparing the favorable set up of a linear combination of operators and the inclusion of the dimension 12 terms in the OPE. Taking into account for the possible large width, we estimate masses for singlet and octet states as $700\sim 850$ MeV, $600\sim 750$ MeV, respectively, although octet states have smaller overlap with the pole than singlet state and may be strongly affected by low energy scattering states. This splitting of singlet and octet states emerges from the number of the $\bar{q}q$ annihilation diagrams, which include both color singlet annihilation processes, $qq\bar{q}\bar{q}\to (q\bar{q})_1$ and color octet annihilation processes, $qq\bar{q}\bar{q}\to G (q\bar{q})_8$. The mass evaluation for the $\sigma$ meson gives the value around $600\sim800$ MeV which is much smaller than the mass obtained by 2-quark correlators, $1.0\sim1.2$ GeV. This indicates $\sigma$ state has the large overlap with the tetraquark states.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:50:42 GMT" } ]
2008-12-30T00:00:00
[ [ "Kojo", "Toru", "" ], [ "Jido", "Daisuke", "" ] ]
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802.2373
Daniel Alpay A
Daniel Alpay and David Levanony
Rational functions associated with the white noise space and related topics
30 pages
null
null
null
math.PR math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by the hyper-holomorphic case we introduce and study rational functions in the setting of Hida's white noise space. The Fueter polynomials are replaced by a basis computed in terms of the Hermite functions, and the Cauchy-Kovalevskaya product is replaced by the Wick product.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 10:13:43 GMT" } ]
2008-02-19T00:00:00
[ [ "Alpay", "Daniel", "" ], [ "Levanony", "David", "" ] ]
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802.2374
Georgi Ganchev
Georgi Ganchev
Canonical Weierstrass Representation of Minimal Surfaces in Euclidean Space
6 pages
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the fact that any minimal strongly regular surface carries locally canonical principal parameters, we obtain a canonical representation of these surfaces, which makes more precise the Weierstrass representation in canonical principal parameters. This allows us to describe locally the solutions of the natural partial differential equation of minimal surfaces.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 11:10:56 GMT" } ]
2008-02-19T00:00:00
[ [ "Ganchev", "Georgi", "" ] ]
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802.2375
Sergey Dmitriev V
Sergey V. Dmitriev, Avinash Khare, Panayotis G. Kevrekidis, Avadh Saxena and Ljupco Hadzievski
High-speed kinks in a generalized discrete $\phi^4$ model
10 pages, 5 figures, submitted to a journal
Phys.Rev.E77:056603,2008
10.1103/PhysRevE.77.056603
null
nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a generalized discrete $\phi^4$ model and demonstrate that it can support exact moving kink solutions in the form of tanh with an arbitrarily large velocity. The constructed exact moving solutions are dependent on the specific value of the propagation velocity. We demonstrate that in this class of models, given a specific velocity, the problem of finding the exact moving solution is integrable. Namely, this problem originally expressed as a three-point map can be reduced to a two-point map, from which the exact moving solutions can be derived iteratively. It was also found that these high-speed kinks can be stable and robust against perturbations introduced in the initial conditions.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 11:11:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Dmitriev", "Sergey V.", "" ], [ "Khare", "Avinash", "" ], [ "Kevrekidis", "Panayotis G.", "" ], [ "Saxena", "Avadh", "" ], [ "Hadzievski", "Ljupco", "" ] ]
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802.2376
Giovanni Lapenta
Giovanni Lapenta
Spontaneous large scale momentum exchange by microinstabilities: an analogy between tokamaks and space plasmas
null
null
null
null
physics.plasm-ph astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on a recent theory (Coppi, Nuclear Fusion, 42, 1, 2002) of spontaneous toroidal rotation in tokamaks (Lee et al, Phys Rev Lett, 91, 205003, 2003) and in astrophysical accretion disks, we propose that an analogous process could be at play also in the Earth space environment. We use fully kinetic PIC simulations to study the evolution of drift instabilities and we show that indeed a macroscopic velocity shear is generated spontaneously in the plasma. As in tokamaks, the microscopic fluctuations remain limited to the edge of the plasma channel but the momentum spreads over the whole macroscopic system.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 11:11:56 GMT" } ]
2008-02-19T00:00:00
[ [ "Lapenta", "Giovanni", "" ] ]
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802.2377
Sofia Olhede Professor
J. M. Lilly and S. C. Olhede
Higher-Order Properties of Analytic Wavelets
15 pages, 6 Postscript figures
Lilly, J. M., and S. C. Olhede, (2009). Higher-order properties of analytic wavelets. IEEE Transactions on Signal Processing, 57 (1), 146--160
10.1109/TSP.2008.2007607
Research Report 289
stat.ME math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The influence of higher-order wavelet properties on the analytic wavelet transform behavior is investigated, and wavelet functions offering advantageous performance are identified. This is accomplished through detailed investigation of the generalized Morse wavelets, a two-parameter family of exactly analytic continuous wavelets. The degree of time/frequency localization, the existence of a mapping between scale and frequency, and the bias involved in estimating properties of modulated oscillatory signals, are proposed as important considerations. Wavelet behavior is found to be strongly impacted by the degree of asymmetry of the wavelet in both the frequency and the time domain, as quantified by the third central moments. A particular subset of the generalized Morse wavelets, recognized as deriving from an inhomogeneous Airy function, emerge as having particularly desirable properties. These "Airy wavelets" substantially outperform the only approximately analytic Morlet wavelets for high time localization. Special cases of the generalized Morse wavelets are examined, revealing a broad range of behaviors which can be matched to the characteristics of a signal.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 12:07:38 GMT" }, { "version": "v2", "created": "Sun, 15 Feb 2009 09:32:33 GMT" } ]
2011-10-18T00:00:00
[ [ "Lilly", "J. M.", "" ], [ "Olhede", "S. C.", "" ] ]
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802.2378
Igor Shparlinski
Igor Shparlinski
On Some Weighted Average Values of L-functions
Bull. Aust. Math. Soc. (to appear)
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $q\ge 2$ and $N\ge 1$ be integers. W. Zhang (2008) has shown that for any fixed $\epsilon> 0$, and $q^{\epsilon} \le N \le q^{1/2 -\epsilon}$, $$ \sum_{\chi \ne \chi_0} |\sum_{n=1}^N \chi(n)|^2 |L(1, \chi)|^2 = (1 + o(1)) \alpha_q q N $$ where the sum is take over all nonprincipal characters $\chi$ modulo $q$, $L(s, \chi)$ is the $L$-functions $L(1, \chi)$ corresponding to $\chi$ and $\alpha_q = q^{o(1)}$ is some explicit function of $q$. Here we show that the same formula holds in the range $q^{\epsilon} \le N \le q^{1 -\epsilon}$.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:31:05 GMT" }, { "version": "v2", "created": "Sat, 26 Jul 2008 11:29:45 GMT" } ]
2008-07-26T00:00:00
[ [ "Shparlinski", "Igor", "" ] ]
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802.2379
Nobuhito Maru
Nobuhito Maru
Towards A Realistic Grand Gauge-Higgs Unification Scenario
11 pages, 5 eps figures, To appear in the proceeding of International Workshop on Grand Unified Theories: Current Status and Future Prospects (GUT07), December 17-19 2007, Kusatsu, Japan
AIPConf.Proc.1015:152-158,2008
10.1063/1.2939048
null
hep-ph
http://creativecommons.org/licenses/by/3.0/
In this talk, we discuss an attempt to construct a realistic model of the grand gauge-Higgs unification. We investigate a 5D SU(6) grand gauge-Higgs unification model compactified on an orbifold S^1/Z_2. Ordinary quarks and leptons, together with right-handed neutrinos, are just accommodated into a minimal set of representations of the gauge group, without introducing any exotic states in the same representations. The proton decay turns out to be forbidden at least at the tree level. We also find a correct electroweak symmetry breaking SU(2)_L \times U(1)_Y \to U(1)_{em} is easily realized by introducing suitable number of adjoint fermions.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 13:01:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Maru", "Nobuhito", "" ] ]
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802.238
Diptiman Sen
Abhishek Dhar, Diptiman Sen, Dibyendu Roy
Scattering of electrons from an interacting region
5 pages including 2 figures; this is the final version published in Physical Review Letters
Phys. Rev. Lett. 101, 066805 (2008)
10.1103/PhysRevLett.101.066805
null
cond-mat.mes-hall cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of transmission of electrons between two noninteracting leads through a region where they interact (quantum dot). We use a model of spinless electrons hopping on a one-dimensional lattice and with an interaction on a single bond. We show that all the two-particle scattering states can be found exactly. Comparisons are made with numerical results on the time evolution of a two-particle wave packet and several interesting features are found for scattering. For N particles the scattering state is obtained by perturbation theory. For a dot connected to Fermi seas at different chemical potentials, we find an expression for the change in the Landauer current resulting from the interactions on the dot. We end with some comments on the case of spin-1/2 electrons.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 13:07:19 GMT" }, { "version": "v2", "created": "Sat, 9 Aug 2008 16:11:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Dhar", "Abhishek", "" ], [ "Sen", "Diptiman", "" ], [ "Roy", "Dibyendu", "" ] ]
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802.2381
Vasily Borodikhin
V.N. Borodikhin
Vector Theory of Gravity
9 pages
Grav.Cosmol.17:161-165,2011
10.1134/S0202289311020071
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We proposed a gravitation theory based on an analogy with electrodynamics on the basis of a vector field. For the first time, to calculate the basic gravitational effects in the framework of a vector theory of gravity, we use a Lagrangian written with gravitational radiation neglected and generalized to the case of ultra-relativistic speeds. This allows us to accurately calculate the values of all three major gravity experiments: the values of the perihelion shift of Mercury, the light deflection angle in the gravity field of the Sun and the value of radar echo delay. The calculated values coincide with the observed ones. It is shown that, in this theory, there exists a model of an expanding Universe.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 13:19:42 GMT" }, { "version": "v2", "created": "Thu, 14 Apr 2011 06:44:30 GMT" } ]
2011-04-20T00:00:00
[ [ "Borodikhin", "V. N.", "" ] ]
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802.2382
Gennadi Sardanashvily
G.Sardanashvily
Mathematical models of spontaneous symmetry breaking
14 pages, The Preface to the special issue "Higgs Mechanism and Spontaneous Symmetry Breaking" of International Journal of Geometric Methods in Modern Physics (v5, N2 2008)
Int. J. Geom. Methods Mod. Phys. v5 (2008) N2, v-xvi
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Higgs mechanism of mass generation is the main ingredient in the contemporary Standard Model and its various generalizations. However, there is no comprehensive theory of spontaneous symmetry breaking. We summarize the relevant mathematical results characterizing spontaneous symmetry breaking phenomena in algebraic quantum theory, axiomatic quantum field theory, group theory, and classical gauge theory.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 14:38:52 GMT" } ]
2008-04-04T00:00:00
[ [ "Sardanashvily", "G.", "" ] ]
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802.2383
Uriel Frisch
Uriel frisch
Translation of Leonhard Euler's: General Principles of the Motion of Fluids
18 pages, 4 figures
null
null
null
nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is an adapatation by U. Frisch of an English translation by Thomas E. Burton of Euler's memoir `Principes g\'en\'eraux du mouvement des fluides' (Euler, 1775b). Burton's translation appeared in Fluid Dynamics, 34} (1999) pp. 801-82, Springer and is here adapted by permission. A detailed presentation of Euler's published work can be found in Truesdell, 1954. Euler's work is discussed also in the perspective of eighteenth century fluid dynamics research by Darrigol and Frisch, 2008. Explanatory footnotes have been supplied where necessary by G.K. Mikhailov and a few more by U. Frisch and O.Darrigol. Euler's memoir had neither footnotes nor a list of references.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 14:43:27 GMT" } ]
2008-02-19T00:00:00
[ [ "frisch", "Uriel", "" ] ]
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802.2384
Alex Volinsky
Xiaolu Pang, Alex A. Volinsky, Kewei Gao
Moisture Effects on Nanowear of Gold Films
null
null
null
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nanowear properties of sputtered Au films in dry and wet environments were investigated using a scanning nanoindenter. Gold exhibits over 10 times higher wear rate in water compared to air at the same normal load of 10 microN. The friction coefficient obtained from scratch tests remained constant at 0.2 regardless of the testing conditions. Au surface roughness increased from 3 to 8 nm after 200 wear cycles in air. Surface ripples, 200 nm high developed on the Au film surface after 200 wear cycles in water. Film scratch hardness compares well with the nanoindentation hardness.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 15:39:04 GMT" } ]
2008-02-19T00:00:00
[ [ "Pang", "Xiaolu", "" ], [ "Volinsky", "Alex A.", "" ], [ "Gao", "Kewei", "" ] ]
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802.2385
Slavcho Shtrakov
Slavcho Shtrakov
Essential variables and positions in terms
17 pages, 2 figures
J. Algebra Universalis, Vol. 61, No 3-4, (2009), pp. 381-397
null
null
math.GM cs.IT math.IT
http://creativecommons.org/licenses/by/3.0/
The paper deals with $\Sigma-$composition of terms, which allows us to extend the derivation rules in formal deduction of identities. The concept of essential variables and essential positions of terms with respect to a set of identities is a key step in the simplification of the process of formal deduction. $\Sigma-$composition of terms is defined as replacement between $\Sigma$-equal terms. This composition induces $\Sigma R-$deductively closed sets of identities. In analogy to balanced identities we introduce and investigate $\Sigma-$balanced identities for a given set of identities $\Sigma$.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 15:43:24 GMT" }, { "version": "v2", "created": "Tue, 22 Jul 2008 18:30:41 GMT" }, { "version": "v3", "created": "Mon, 1 Sep 2008 07:53:14 GMT" }, { "version": "v4", "created": "Tue, 19 Jan 2010 12:51:30 GMT" } ]
2010-01-19T00:00:00
[ [ "Shtrakov", "Slavcho", "" ] ]
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802.2386
Yuri Shibanov
Yuri Shibanov (1), Natalia Lundqvist (2), Peter Lundqvist (2), Jesper Sollerman (2,3), Dmitri Zyuzin (4) ((1) Ioffe Inst., St. Petersburg, Russia, (2) Stockholm Observatory, Sweden, (3) Dark Cosmology Center, Copenhagen, Denmark, (4) Acad. Phys. Techn. Univ., St. Petersburg, Russia)
Optical identification of the 3C 58 pulsar wind nebula
12 pages including 7 figures, submitted for publication in A&A. For high resolution images, see http://www.ioffe.ru/astro/NSG/obs/3C58/
null
10.1051/0004-6361:200809573
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have performed a deep optical imaging of 3C 58 SNR with the NOT in the B and V bands to detect the optical counterpart of the associated pulsar J0295+6449 and its torus-like wind nebula visible in X-rays. We analyzed our data together with the archival data obtained with the Chandra in X-rays and with the Spitzer in the mid-IR. We detect a faint extended elliptical object with B=24.06 and V=23.11 whose peak brightness and center position are consistent at the sub-arcsecond level with the position of the pulsar. Its morphology and orientation are in excellent agreement with the torus-like pulsar nebula, seen almost edge on in X-rays although its extension is only about a half of that in X-rays. In the optical we likely see only the brightest central part of the torus with the pulsar. The object is identical to the counterpart of the torus recently detected in the mid-IR. The estimated pulsar contribution to the optical flux is less than 10%. Combinig the optical/mid-IR fluxes and X-ray power-law spectrum extracted from the spatial region constrained by the optical/IR source extent we compile a tentative multi-wavelength spectrum of the central part of the nebula. Within uncertainties of the interstellar extinction it is reminiscent of either the Crab or B0540-69 pulsar wind nebula spectra. The properties of the object strongly suggest it to be the optical counterpart of the 3C 58 pulsar + its wind nebula system, making 3C 58 the third member of such a class of the torus-like systems identified in the optical and mid-IR.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 15:54:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Shibanov", "Yuri", "" ], [ "Lundqvist", "Natalia", "" ], [ "Lundqvist", "Peter", "" ], [ "Sollerman", "Jesper", "" ], [ "Zyuzin", "Dmitri", "" ] ]
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802.2387
Tianxing Ma
Tianxing Ma, Bal\'azs D\'ora
NMR relaxation rate and static spin susceptibility in graphene
7 pages, 6 figures
null
null
null
cond-mat.str-el cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The NMR relaxation rate and the static spin susceptibility in graphene are studied within a tight-binding description. At half filling, the NMR relaxation rate follows a power law as $T^2$ on the particle-hole symmetric side, while with a finite chemical potential $\mu$ and next-nearest neighbor $t'$, the $(\mu+3t')^2$ terms dominate at low excess charge $\delta$. The static spin susceptibility is linearly dependent on temperature $T$ at half filling when $t'=0$, while with a finite $\mu$ and $t'$, it should be dominated by $(\mu+3t')$ terms in low energy regime. These unusual phenomena are direct results of the low energy excitations of graphene, which behave as massless Dirac fermions. Furthermore, when $\delta$ is high enough, there is a pronounced crossover which divides the temperature dependence of the NMR relaxation rate and the static spin susceptibility into two temperature regimes: the NMR relaxation rate and the static spin susceptibility increase dramatically as temperature increases in the low temperature regime, and after the crossover, both decrease as temperature increases at high temperatures. This crossover is due to the well-known logarithmic Van Hove singularity in the density of states, and its position dependence of temperature is sensitive to $\delta$.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 16:00:27 GMT" } ]
2008-02-19T00:00:00
[ [ "Ma", "Tianxing", "" ], [ "Dóra", "Balázs", "" ] ]
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802.2388
Daniel Corbett
D. Corbett and M. Warner
Bleaching and stimulated recovery of dyes and of photo-cantilevers
null
null
10.1103/PhysRevE.77.051710
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine how intense optical beams can penetrate deeply into highly absorbing media by a non-linear, photo-bleaching process. The role of stimulated recovery to the dye ground state can be important and is delineated. This analysis of non-linear absorption processes is applicable in general to situations where chromophores are irradiated, for instance in biology. We examine the implications for the bending of cantilevers made of heavily dye-loaded nematic photo-solids, that is nematic glasses and elastomers that have large mechanical reactions to light. In particular we describe the bending of cantilevers sufficiently absorbing that they would not bend if Beer's Law were applicable. We quantify the role of optically-generated heat in determining the mechanical response and conclude that in general it is minor in importance compared with optical effects.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 16:21:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Corbett", "D.", "" ], [ "Warner", "M.", "" ] ]
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802.2389
Kirill Bolotin
K. I. Bolotin, K. J. Sikes, Z. Jiang, M. Klima, G. Fudenberg, J. Hone, P. Kim, H. L. Stormer
Ultrahigh electron mobility in suspended graphene
4 pages, 3 figures, references updated
Solid State Communications 146, 351-355 (2008)
10.1016/j.ssc.2008.02.024
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://creativecommons.org/licenses/by/3.0/
We have achieved mobilities in excess of 200,000 cm^2/Vs at electron densities of ~2*10^11 cm^-2 by suspending single layer graphene. Suspension ~150 nm above a Si/SiO_2 gate electrode and electrical contacts to the graphene was achieved by a combination of electron beam lithography and etching. The specimens were cleaned in situ by employing current-induced heating, directly resulting in a significant improvement of electrical transport. Concomitant with large mobility enhancement, the widths of the characteristic Dirac peaks are reduced by a factor of 10 compared to traditional, non-suspended devices. This advance should allow for accessing the intrinsic transport properties of graphene.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 16:53:59 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 23:59:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Bolotin", "K. I.", "" ], [ "Sikes", "K. J.", "" ], [ "Jiang", "Z.", "" ], [ "Klima", "M.", "" ], [ "Fudenberg", "G.", "" ], [ "Hone", "J.", "" ], [ "Kim", "P.", "" ], [ "Stormer", "H. L.", "" ] ]
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802.239
Tim D. Cochran
Tim D. Cochran (Rice University), Shelly Harvey (Rice University)
Homological stability of series of groups
minor revisions
Pacific Journal of Mathematics, vol. 246,No.1, 2010, 31-47
null
null
math.GT math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
``What aspects of a group are unchanged, or stable, under homology equivalences''? The model theorem in this regard is the 1963 result of J. Stallings that the lower central series is preserved under any integral homological equivalence of groups. Various other theorems of this nature have since appeared. Stallings himself proved similar theorems for homology with rational or mod p coefficients. These involved different series of groups- variations of the lower central series. W. Dwyer generalized Stallings' integral results to larger classes of maps, work that was completed in the other cases by the authors. More recently the authors proved analogues of the theorems of Stallings and Dwyer for variations of the derived series. The above theorems are all different but clearly have much in common. Here we present a new concept, that of the stability of a subgroup, or a series of subgroups under a class of maps, that offers a framework in which all of these theorems can be viewed. We contrast it with homological localization of groups, which is a previously well-studied framework that might also be applied to these questions.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 17:54:25 GMT" }, { "version": "v2", "created": "Wed, 30 Sep 2009 03:20:32 GMT" } ]
2010-05-04T00:00:00
[ [ "Cochran", "Tim D.", "", "Rice University" ], [ "Harvey", "Shelly", "", "Rice University" ] ]
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802.2391
Denes Petz
D. Petz, A. Szanto, M. Weiner
Complementarity and the algebraic structure of 4-level quantum systems
19 pages
J. Infin. Dim. Anal. Quantum Probability and Related Topics 12(2009), 99-116.
10.1088/1742-6596/143/1/012011
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The history of complementary observables and mutual unbiased bases is reviewed. A characterization is given in terms of conditional entropy of subalgebras. The concept of complementarity is extended to non-commutative subalgebras. Complementary decompositions of a 4-level quantum system are described and a characterization of the Bell basis is obtained.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 18:03:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Petz", "D.", "" ], [ "Szanto", "A.", "" ], [ "Weiner", "M.", "" ] ]
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802.2392
Tigran Hakobyan
Tigran Hakobyan
Antiferromagnetic ordering of energy levels for spin ladder with four-spin cyclic exchange: Generalization of the Lieb-Mattis theorem
4 pages, some references updated and added, typos corrected, to appear in Phys. Rev. B
Phys. Rev. B 78, 012407 (2008)
10.1103/PhysRevB.78.012407
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Lieb-Mattis theorem is generalized to an antiferromagnetic spin-ladder model with four-spin cyclic exchange interaction. We prove that for J>2K, the antiferromagnetic ordering of energy levels takes place separately in two sectors, which remain symmetric and antisymmetric under the reflection with respect to the longitudinal axis of the ladder. We prove also that at the self-dual point J=2K, the Lieb-Mattis rule holds in the sectors with fixed number of rung singlets. In both cases, it agrees with the similar rule for Haldane chain with appropriate spin number.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 18:34:11 GMT" }, { "version": "v2", "created": "Wed, 25 Jun 2008 13:51:19 GMT" } ]
2008-07-24T00:00:00
[ [ "Hakobyan", "Tigran", "" ] ]
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802.2393
Crystal Martin
Crystal L. Martin, Marcin Sawicki, Alan Dressler and Pat McCarthy
A Magellan IMACS Spectroscopic Search for Lyman-Alpha Emitting Galaxies at Redshift 5.7
Accepted for publication in May 20 Astrophysical Journal; Also available at http://www.physics.ucsb.edu/~cmartin/publications.html
null
10.1086/586729
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present results from a blind, spectroscopic survey for redshift ~5.7 Lyman-alpha-emitting galaxies using the Inamori Magellan Areal Camera and Spectrograph. A total of ~200 square arcminutes were observed in the COSMOS and LCIRS fields using a narrowband filter, which transmits between atmospheric emission lines at 8190 A, and a mask with 100 longslits. This observing technique provides higher emission-line sensitivity than narrowband imaging and probes larger volumes than strong lensing. We find 170 emission-line galaxies and identify their redshifts spectroscopically. We confirm three Lyman-alpha emitting galaxies (LAEs), the first discovered using multislit-narrowband spectroscopy. Their line profiles are narrow, but fitted models suggest instrinsic, unattenuated widths 400 km/s FWHM. The red wing of the line profiles present features consistent with galactic winds. The star formation rates of these galaxies are at least 5-7 Msun/yr and likely a factor of two higher. We estimate the number density of L .ge. 5e42 erg/s LAEs is 9.0(+12,-4)e-5 Mpc-3 at redshift 5.7 and constrain the Schechter function parameters describing this population. Galaxies fainter than our detection limit may well be the primary source of ionizing photons at redshift ~ 6. We argue, however, that the break luminosity L* is not yet well constrained. If this break luminosity is near our detection limit, and somewhat lower than previous estimates, then the detected LAE population could be responsible for ionizing the intergalactic gas at redshift ~6. We discuss the potential of multislit-narrowband spectroscopy for deeper emission-line surveys.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 18:28:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Martin", "Crystal L.", "" ], [ "Sawicki", "Marcin", "" ], [ "Dressler", "Alan", "" ], [ "McCarthy", "Pat", "" ] ]
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802.2394
Peter Jonker
P.G. Jonker (SRON, Cfa, Uu), M.A.P. Torres (CfA), D. Steeghs (Warwick, Cfa)
Observations of IGR J00291+5934 in quiescence
5 pages, 5 figures, accepted for publication in ApJ, uses emulateapj
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on optical and X-ray observations of the accretion powered ms pulsar IGR J00291+5934 in quiescence. Time resolved I-band photometry has been obtained with the 4.2 m William Herschel Telescope, while a 3 ks Chandra observation provided contemporaneous X-ray coverage. We found an unabsorbed 0.5-10 keV X-ray flux of 1x10^-13 erg cm-2 s-1 which implies that the source was in quiescence at the time of the optical observations. Nevertheless, the optical I-band light curve of IGR J00291+5934 shows evidence for strong flaring. After removal of the strongest flares, we find evidence for an orbital modulation in the phase folded I-band light curve. The overall modulation can be described by effects resulting from the presence of a superhump. Comparing our lightcurve with that reported recently we find evidence for a change in the quiescent base level. Similar changes have now been reported for 4 soft X-ray transients implying that they may be a common feature of such systems in quiescence. Furthermore, the maximum in our folded lightcurve occurs at a different phase than observed before.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 19:53:19 GMT" } ]
2008-02-19T00:00:00
[ [ "Jonker", "P. G.", "", "SRON, Cfa, Uu" ], [ "Torres", "M. A. P.", "", "CfA" ], [ "Steeghs", "D.", "", "Warwick,\n Cfa" ] ]
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802.2395
Lior Pachter
Radu Mihaescu and Lior Pachter
Combinatorics of least squares trees
null
null
10.1073/pnas.0802089105
null
math.CO math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A recurring theme in the least squares approach to phylogenetics has been the discovery of elegant combinatorial formulas for the least squares estimates of edge lengths. These formulas have proved useful for the development of efficient algorithms, and have also been important for understanding connections among popular phylogeny algorithms. For example, the selection criterion of the neighbor-joining algorithm is now understood in terms of the combinatorial formulas of Pauplin for estimating tree length. We highlight a phylogenetically desirable property that weighted least squares methods should satisfy, and provide a complete characterization of methods that satisfy the property. The necessary and sufficient condition is a multiplicative four point condition that the the variance matrix needs to satisfy. The proof is based on the observation that the Lagrange multipliers in the proof of the Gauss--Markov theorem are tree-additive. Our results generalize and complete previous work on ordinary least squares, balanced minimum evolution and the taxon weighted variance model. They also provide a time optimal algorithm for computation.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 20:14:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Mihaescu", "Radu", "" ], [ "Pachter", "Lior", "" ] ]
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802.2396
Hiroaki Abuki
H. Abuki (1), M. Ciminale (1 and 2), R. Gatto (3), G. Nardulli (1 and 2), and M. Ruggieri (1 and 2) ((1) INFN, Bari, (2) University of Bari, (3) University of Geneva)
Enforced neutrality and color-flavor unlocking in the three-flavor Polyakov-loop NJL model
11 pages, REVTex4, 10 eps figures; v2: added two notes, added a reference; version to appear in Phys. Rev. D
Phys.Rev.D77:074018,2008
10.1103/PhysRevD.77.074018
BARI-TH/08-588
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study how the charge neutrality affects the phase structure of three-flavor PNJL model. We point out that, within the conventional PNJL model at finite density the color neutrality is missing because the Wilson line serves as an external ``colored'' field coupled to dynamical quarks. In this paper we heuristically assume that the model may still be applicable. To get color neutrality one has then to allow non vanishing color chemical potentials. We study how the quark matter phase diagram in $(T,m_s^2/\mu)$-plane is affected by imposing neutrality and by including the Polyakov loop dynamics. Although these two effects are correlated in a nonlinear way, the impact of the Polyakov loop turns out to be significant in the $T$ direction, while imposing neutrality brings a remarkable effect in the $m_s^2/\mu$ direction. In particular, we find a novel unlocking transition, when the temperature is increased, even in the chiral SU(3) limit. We clarify how and why this is possible once the dynamics of the colored Polyakov loop is taken into account. Also we succeed in giving an analytic expression for $T_c$ for the transition from two-flavor pairing (2SC) to unpaired quark matter in the presence of the Polyakov loop.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 20:36:14 GMT" }, { "version": "v2", "created": "Fri, 25 Apr 2008 19:49:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Abuki", "H.", "", "1 and 2" ], [ "Ciminale", "M.", "", "1 and 2" ], [ "Gatto", "R.", "", "1 and\n 2" ], [ "Nardulli", "G.", "", "1 and\n 2" ], [ "Ruggieri", "M.", "", "1 and 2" ] ]
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802.2397
Prof. Dr. M. W. Wu
K. Shen, M. W. Wu
Robust strongly-modulated transmission of a $T$-shaped structure with local Rashba interaction
4 pages, 3 figures, To be published in PRB
Phys. Rev. B 77, 193305 (2008)
10.1103/PhysRevB.77.193305
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a scheme of spin transistor using a $T$-shaped structure with local Rashba interaction. A wide antiresonance energy gap appears due to the interplay of two types of interference, the Fano-Rashba interference and the structure interference. A large current from the gap area can be obtained via changing the Rashba strength and/or the length of the sidearm by using gate voltage. The robustness of the antiresonance gap against strong disorder is demonstrated and shows the feasibility of this structure for the real application.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:14:38 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 10:16:27 GMT" }, { "version": "v3", "created": "Wed, 16 Apr 2008 23:27:29 GMT" } ]
2008-05-08T00:00:00
[ [ "Shen", "K.", "" ], [ "Wu", "M. W.", "" ] ]
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802.2398
Jared Cole
Jared H. Cole, Andrew D. Greentree, L. C. L. Hollenberg, S. Das Sarma
Spatial adiabatic passage in a realistic triple well structure
10 pages, 12 figures (color online) - Published Version
Phys. Rev. B 77, 235418 (2008)
10.1103/PhysRevB.77.235418
null
cond-mat.mes-hall quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the evolution of an electron undergoing coherent tunneling via adiabatic passage (CTAP) using the solution of the one-dimensional Schroedinger equation in both space and time for a triple well potential. We find the eigenspectrum and complete time evolution for a range of different pulsing schemes. This also provides an example of a system that can be described with the tools from both quantum optics and condensed matter. We find that while the quantum optics description of the process captures most of the key physics, there are important effects that can only be correctly described by a more complete representation. This is an important point for applications such as quantum information processing or quantum control where it is common practice to use a reduced state space formulation of the quantum system in question.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 22:21:01 GMT" }, { "version": "v2", "created": "Wed, 18 Jun 2008 09:18:33 GMT" } ]
2008-06-18T00:00:00
[ [ "Cole", "Jared H.", "" ], [ "Greentree", "Andrew D.", "" ], [ "Hollenberg", "L. C. L.", "" ], [ "Sarma", "S. Das", "" ] ]
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802.2399
Guy Bunin
Guy Bunin
Towards Unstructured Mesh Generation Using the Inverse Poisson Problem
null
null
null
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel approach to unstructured quadrilateral mesh generation for planar domains is presented. Away from irregular vertices, the resulting meshes have the properties of nearly conformal grids. The technique is based on a theoretical relation between the present problem, and the inverse Poisson (IP) problem with point sources. An IP algorithm is described, which constructs a point-source distribution, whose sources correspond to the irregular vertices of the mesh. Both the background theory and the IP algorithm address the global nature of the mesh generation problem. The IP algorithm is incorporated in a complete mesh generation scheme, which also includes an algorithm for creating the final mesh. Example results are presented and discussed.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 22:38:28 GMT" } ]
2008-02-19T00:00:00
[ [ "Bunin", "Guy", "" ] ]
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802.24
Christophe Royon
D0 Collaboration: V.M. Abazov, et al
Measurement of the inclusive jet cross section in $p \bar{p}$ collisions at $\sqrt{s}=1.96 {\rm TeV}$
Published version in Phys. Rev. Lett
Phys.Rev.Lett.101:062001,2008
10.1103/PhysRevLett.101.062001
FERMILAB-PUB-08-034-E
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a measurement of the inclusive jet cross section in $p \bar{p}$ collisions at a center-of-mass energy $\sqrt s=$1.96 TeV using data collected by the D0 experiment at the Fermilab Tevatron Collider corresponding to an integrated luminosity of 0.70 fb$^{-1}$. The data cover jet transverse momenta from 50 GeV to 600 GeV and jet rapidities in the range -2.4 to 2.4. Detailed studies of correlations between systematic uncertainties in transverse momentum and rapidity are presented, and the cross section measurements are found to be in good agreement with next-to-leading order QCD calculations.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 22:41:59 GMT" }, { "version": "v2", "created": "Mon, 11 Aug 2008 10:12:50 GMT" }, { "version": "v3", "created": "Tue, 12 Aug 2008 16:34:43 GMT" } ]
2008-11-26T00:00:00
[ [ "D0 Collaboration", "", "" ], [ "Abazov", "V. M.", "" ] ]
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802.2401
Victor Colussi E.
V. Colussi and S. Wickramasekara
A Bicycle Built for Two: The Galilean and U(1) Gauge Invariance of the Schr\"odinger Field
13 pages, 0 figures, Physical Review A format, Section on Maxwell's Eqns added
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper undertakes a study of the nature of the force associated with the local U (1) gauge symmetry of a non-relativistic quantum particle. To ensure invariance under local U (1) symmetry, a matter field must couple to a gauge field. We show that such a gauge field necessarily satisfies the Maxwell equations, whether the matter field coupled to it is relativistic or non-relativistic. This result suggests that the structure of the Maxwell equations is determined by gauge symmetry rather than the symmetry transformation properties of space-time. In order to assess the validity of this notion, we examine the transformation properties of the coupled matter and gauge fields under Galilean transformations. Our main technical result is the Galilean invariance of the full equations of motion of the U (1) gauge field.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 23:05:28 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 22:28:08 GMT" } ]
2008-03-05T00:00:00
[ [ "Colussi", "V.", "" ], [ "Wickramasekara", "S.", "" ] ]
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802.2402
Andr\'as Vukics
Andr\'as Vukics, Wolfgang Niedenzu, and Helmut Ritsch
Cavity nonlinear optics with few photons and ultracold quantum particles
5 pages, 5 figures
Phys. Rev. A 79, 013828 (2009)
10.1103/PhysRevA.79.013828
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The light force on particles trapped in the field of a high-Q cavity mode depends on the quantum state of field and particle. Different photon numbers generate different optical potentials anddifferent motional states induce different field evolution. Even for weak saturation and linear polarizability the induced particle motion leads to nonlinear field dynamics. We derive a corresponding effective field Hamiltonian containing all the powers of the photon number operator, which predicts nonlinear phase shifts and squeezing even at the few-photon level. Wave-function simulations of the full particle-field dynamics confirm this and show significant particle-field entanglement in addition.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 23:23:30 GMT" } ]
2009-04-17T00:00:00
[ [ "Vukics", "András", "" ], [ "Niedenzu", "Wolfgang", "" ], [ "Ritsch", "Helmut", "" ] ]
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