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704.0601
Chuan Hung Chen
Chuan-Hung Chen, Chao-Qiang Geng, Tzu-Chiang Yuan
D-\bar D mixing and rare D decays in the Littlest Higgs model with non-unitarity matrix
18 pages, 6 figures, references added and updated, version to appear in Phys. Lett. B
Phys.Lett.B655:50-57,2007
10.1016/j.physletb.2007.08.084
null
hep-ph hep-ex
null
We study the $D-\bar D$ mixing and rare D decays in the Littlest Higgs model. As the new weak singlet quark with the electric charge of 2/3 is introduced to cancel the quadratic divergence induced by the top-quark, the standard unitary $3\times 3$ Cabibbo-Kobayashi-Maskawa matrix is extended to a non-unitary $4\times 3$ matrix in the quark charged currents and Z-mediated flavor changing neutral currents are generated at tree level. In this model, we show that the $D-\bar D$ mixing parameter can be as large as the current experimental value and the decay branching ratio (BR) of $D\to X_u \ga$ is small but its direct CP asymmetry could be $O(10%)$. In addition, we find that the BRs of $D\to X_u \ell^{+} \ell^{-}$, $D\to X_u\nu \bar \nu$ and $D\to \mu^{+} \mu^{-}$ could be enhanced to be $O(10^{-9})$, $O(10^{-8})$ and $O(10^{-9})$, respectively.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 15:58:48 GMT" }, { "version": "v2", "created": "Mon, 9 Apr 2007 14:34:38 GMT" }, { "version": "v3", "created": "Mon, 27 Aug 2007 15:18:27 GMT" }, { "version": "v4", "created": "Wed, 24 Oct 2007 07:49:37 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Chen", "Chuan-Hung", "" ], [ "Geng", "Chao-Qiang", "" ], [ "Yuan", "Tzu-Chiang", "" ] ]
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704.0602
Sannino Francesco
Francesco Sannino (CERN and University of Southern Denmark), Joseph Schechter (Syracuse University)
Alternative Large Nc Schemes and Chiral Dynamics
RevTex, two-columns, 6 pages
Phys.Rev.D76:014014,2007
10.1103/PhysRevD.76.014014
CERN-PH-TH/2007-068, SU-4252-8489
hep-ph hep-lat hep-th nucl-th
null
We compare the dependences on the number of colors of the leading pion pion scattering amplitudes using the single index quark field and two index quark fields. These are seen to have different relationships to the scattering amplitudes suggested by chiral dynamics which can explain the long puzzling pion pion s wave scattering up to about 1 GeV. This may be interesting for getting a better understanding of the large Nc approach as well as for application to recently proposed technicolor models.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:39:03 GMT" } ]
"2009-09-29T00:00:00"
[ [ "Sannino", "Francesco", "", "CERN and University of Southern Denmark" ], [ "Schechter", "Joseph", "", "Syracuse University" ] ]
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704.0603
J\'ulius Koza
J. Koza, A. Kucera, J. Ryb\'ak, H. W\"ohl
The height dependence of temperature - velocity correlation in the solar photosphere
In press,"Modern Solar Facilities - Advanced Solar Science", (Gottingen), Universitatsverlag Gottingen, 139-142, 2007
Modern solar facilities - advanced solar science, Editors: F. Kneer, K. G. Puschmann, A. D. Wittmann, p. 139 (2007)
null
null
astro-ph
null
We derive correlation coefficients between temperature and line-of-sight velocity as a function of optical depth throughout the solar photosphere for the non-magnetic photosphere and a small area of enhanced magnetic activity. The maximum anticorrelation of about -0.6 between temperature and line-of-sight velocity in the non-magnetic photosphere occurs at log tau5 = -0.4. The magnetic field is another decorrelating factor along with 5-min oscillations and seeing.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:07:36 GMT" } ]
"2017-12-27T00:00:00"
[ [ "Koza", "J.", "" ], [ "Kucera", "A.", "" ], [ "Rybák", "J.", "" ], [ "Wöhl", "H.", "" ] ]
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704.0604
Tom Lancaster
T. Lancaster, S.J. Blundell, P.J. Baker, W. Hayes, S.R. Giblin, S.E. McLain, F.L. Pratt, Z. Salman, E.A. Jacobs, J.F.C. Turner and T. Barnes
Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation
4 pages, 3 figures
Phys. Rev. B 75, 220408(R) (2007)
10.1103/PhysRevB.75.220408
null
cond-mat.str-el
null
We present the results of a muon-spin relaxation study of the high-Tc analogue material Cs2AgF4. We find unambiguous evidence for magnetic order, intrinsic to the material, below T_C=13.95(3) K. The ratio of inter- to intraplane coupling is estimated to be |J'/J|=1.9 x 10^-2, while fits of the temperature dependence of the order parameter reveal a critical exponent beta=0.292(3), implying an intermediate character between pure two- and three- dimensional magnetism in the critical regime. Above T_C we observe a signal characteristic of dipolar interactions due to linear F-mu-F bonds, allowing the muon stopping sites in this compound to be characterized.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:10:00 GMT" } ]
"2007-11-14T00:00:00"
[ [ "Lancaster", "T.", "" ], [ "Blundell", "S. J.", "" ], [ "Baker", "P. J.", "" ], [ "Hayes", "W.", "" ], [ "Giblin", "S. R.", "" ], [ "McLain", "S. E.", "" ], [ "Pratt", "F. L.", "" ], [ "Salman", "Z.", "" ], [ "Jacobs", "E. A.", "" ], [ "Turner", "J. F. C.", "" ], [ "Barnes", "T.", "" ] ]
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704.0605
Alexei Nefediev
C.Hanhart (FZ-Juelich), Yu.S.Kalashnikova, A.E.Kudryavtsev, A.V.Nefediev (ITEP, Moscow)
Reconciling the X(3872) with the near-threshold enhancement in the D^0\bar{D}^{*0} final state
RevTeX4, 17 pages, some references updated and corrected, version published in Phys. Rev. D
Phys.Rev.D76:034007,2007
10.1103/PhysRevD.76.034007
FZJ-IKP(TH)-2007-14
hep-ph hep-ex
null
We investigate the enhancement in the D^0\bar{D}^0\pi^0 final state with the mass M=3875.2\pm 0.7^{+0.3}_{-1.6}\pm 0.8 MeV found recently by the Belle Collaboration in the B\to K D^0\bar{D}^0\pi^0 decay and test the possibility that this is yet another manifestation of the well-established resonance X(3872). We perform a combined Flatte analysis of the data for the D^0\bar{D}^0\pi^0 mode, and for the \pi^+\pi^- J/\psi mode of the X(3872). Only if the X(3872) is a virtual state in the D^0\bar{D}^{*0} channel, the data on the new enhancement comply with those on the X(3872). In our fits, the mass distribution in the D^0\bar{D}^{*0} mode exhibits a peak at 2-3 MeV above the D^0\bar{D}^{*0} threshold, with a distinctive non-Breit-Wigner shape.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:12:31 GMT" }, { "version": "v2", "created": "Mon, 27 Aug 2007 13:21:54 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Hanhart", "C.", "", "FZ-Juelich" ], [ "Kalashnikova", "Yu. S.", "", "ITEP, Moscow" ], [ "Kudryavtsev", "A. E.", "", "ITEP, Moscow" ], [ "Nefediev", "A. V.", "", "ITEP, Moscow" ] ]
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704.0606
Andreas Ruschhaupt
A. Ruschhaupt and J. G. Muga
Three-dimensional effects in "atom diodes": atom-optical devices for one-way motion
10 pages, 8 figures
null
10.1103/PhysRevA.76.013619
null
quant-ph
null
The ``atom diode'' is a laser device that lets the ground state atom pass in one direction but not in the opposite direction. We examine three-dimensional effects of that device for arbitrary atomic incidence angles on flat laser sheets and set breakdown limiting angles and velocities. It is found that a correct diodic behavior independent of the incident angle can be obtained with blue detuned lasers.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:32:29 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Ruschhaupt", "A.", "" ], [ "Muga", "J. G.", "" ] ]
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704.0607
Farhan Rana
Farhan Rana, Faisal R. Ahmad
Plasmon Amplification through Stimulated Emission at Terahertz Frequencies in Graphene
13 pages, 9 figures
null
null
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We show that plasmons in two-dimensional graphene can have net gain at terahertz frequencies. The coupling of the plasmons to interband electron-hole transitions in population inverted graphene layers can lead to plasmon amplification through the process of stimulated emission. We calculate plasmon gain for different electron-hole densities and temperatures and show that the gain values can exceed $10^{4}$ cm$^{-1}$ in the 1-10 terahertz frequency range, for electron-hole densities in the $10^{9}$-$10^{11}$ cm$^{-2}$ range, even when plasmon energy loss due to intraband scattering is considered. Plasmons are found to exhibit net gain for intraband scattering times shorter than 100 fs. Such high gain values could allow extremely compact terahertz amplifiers and oscillators that have dimensions in the 1-10 $\mu$m range.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:20:40 GMT" }, { "version": "v2", "created": "Sat, 26 May 2007 10:07:40 GMT" } ]
"2007-06-13T00:00:00"
[ [ "Rana", "Farhan", "" ], [ "Ahmad", "Faisal R.", "" ] ]
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704.0608
Aron Simis
J. Hong, A. Simis, W. V. Vasconcelos
On the homology of two-dimensional elimination
22pages
null
null
null
math.AC math.AG
null
We study birational maps with empty base locus defined by almost complete intersection ideals. Birationality is shown to be expressed by the equality of two Chern numbers. We provide a relatively effective method of their calculation in terms of certain Hilbert coefficients. In dimension two the structure of the irreducible ideals leads naturally to the calculation of Sylvester determinants via a computer-assisted method. For degree at most 5 we produce the full set of defining equations of the base ideal. The results answer affirmatively some questions raised by D. Cox.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:23:44 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Hong", "J.", "" ], [ "Simis", "A.", "" ], [ "Vasconcelos", "W. V.", "" ] ]
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704.0609
Thomas B. Bahder
Paul A Lopata, Thomas B Bahder
The effectiveness of quantum operations for eavesdropping on sealed messages
10 pages, 2 figures. Third Feynman Festival, 25 -- 29 August 2006, University of Maryland, College Park, Maryland, U.S.A
null
10.1088/1742-6596/70/1/012011
null
quant-ph
null
A quantum protocol is described which enables a user to send sealed messages and that allows for the detection of active eavesdroppers. We examine a class of eavesdropping strategies, those that make use of quantum operations, and we determine the information gain versus disturbance caused by these strategies. We demonstrate this tradeoff with an example and we compare this protocol to quantum key distribution, quantum direct communication, and quantum seal protocols.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:31:03 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Lopata", "Paul A", "" ], [ "Bahder", "Thomas B", "" ] ]
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704.061
Claudio Conti
Neda Ghofraniha, Claudio Conti, Giancarlo Ruocco, Stefano Trillo
Shocks in nonlocal media
5 pages, 5 figures
Phys. Rev. Lett. 99, 043903 (2007)
10.1103/PhysRevLett.99.043903
null
physics.optics cond-mat.soft nlin.PS physics.flu-dyn
null
We investigate the formation of collisionless shocks along the spatial profile of a gaussian laser beam propagating in nonlocal nonlinear media. For defocusing nonlinearity the shock survives the smoothing effect of the nonlocal response, though its dynamics is qualitatively affected by the latter, whereas for focusing nonlinearity it dominates over filamentation. The patterns observed in a thermal defocusing medium are interpreted in the framework of our theory.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:41:37 GMT" } ]
"2007-09-13T00:00:00"
[ [ "Ghofraniha", "Neda", "" ], [ "Conti", "Claudio", "" ], [ "Ruocco", "Giancarlo", "" ], [ "Trillo", "Stefano", "" ] ]
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704.0611
Igor Grabec
A. Borstnik Bracic, E. Govekar and I. Grabec
Modeling the field of laser welding melt pool by RBFNN
5 pages, 6 eps figures, uses IEEEtran.cls
null
null
null
physics.comp-ph physics.data-an
null
Efficient control of a laser welding process requires the reliable prediction of process behavior. A statistical method of field modeling, based on normalized RBFNN, can be successfully used to predict the spatiotemporal dynamics of surface optical activity in the laser welding process. In this article we demonstrate how to optimize RBFNN to maximize prediction quality. Special attention is paid to the structure of sample vectors, which represent the bridge between the field distributions in the past and future.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:43:59 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Bracic", "A. Borstnik", "" ], [ "Govekar", "E.", "" ], [ "Grabec", "I.", "" ] ]
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704.0612
Javier L. Albacete
Javier L. Albacete and Yuri V. Kovchegov
Solving The High Energy Evolution Equation Including Running Coupling Corrections
30 pages and 12 figures. Typos corrected and references updated
Phys.Rev.D75:125021,2007
10.1103/PhysRevD.75.125021
null
hep-ph nucl-th
null
We study the solution of the nonlinear BK evolution equation with the recently calculated running coupling corrections [hep-ph/0609105, hep-ph/0609090]. Performing a numerical solution we confirm the earlier result of [hep-ph/0408216] that the high energy evolution with the running coupling leads to a universal scaling behavior for the dipole scattering amplitude. The running coupling corrections calculated recently significantly change the shape of the scaling function as compared to the fixed coupling case leading to a considerable increase in the anomalous dimension and to a slow-down of the evolution with rapidity. The difference between the two recent calculations is due to an extra contribution to the evolution kernel, referred to as the subtraction term, which arises when running coupling corrections are included. These subtraction terms were neglected in both recent calculations. We evaluate numerically the subtraction terms for both calculations, and demonstrate that when the subtraction terms are added back to the evolution kernels obtained in the two works the resulting dipole amplitudes agree with each other! We then use the complete running coupling kernel including the subtraction term to find the numerical solution of the resulting full non-linear evolution equation with the running coupling corrections. Again the scaling regime is recovered at very large rapidity.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 16:54:26 GMT" }, { "version": "v2", "created": "Fri, 22 Jun 2007 18:56:47 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Albacete", "Javier L.", "" ], [ "Kovchegov", "Yuri V.", "" ] ]
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704.0613
D. B. Gutman
D. B. Gutman and D. L. Maslov
Anomalous c-axis transport in layered metals
5 pages 2 figures
Phys. Rev. Lett. 99, 196602 (2007)
10.1103/PhysRevLett.99.196602
null
cond-mat.str-el cond-mat.dis-nn
null
Transport in metals with strongly anisotropic single-particle spectrum is studied. Coherent band transport in all directions, described by the standard Boltzmann equation, is shown to withstand both elastic and inelastic scattering as long as $E_F\tau\gg 1$. A model of phonon-assisted tunneling via resonant states located in between the layers is suggested to explain a non-monotonic temperature dependence of the c-axis resistivity observed in experiments.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:02:20 GMT" } ]
"2009-03-22T00:00:00"
[ [ "Gutman", "D. B.", "" ], [ "Maslov", "D. L.", "" ] ]
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704.0614
Zwonek
Wlodzimierz Zwonek
Proper holomorphic mappings of the spectral unit ball
6 pages
null
null
null
math.CV math.SP
null
We prove an Alexander type theorem for the spectral unit ball $\Omega_n$ showing that there are no non-trivial proper holomorphic mappings in $\Omega_n$, $n\geq 2$.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:03:41 GMT" }, { "version": "v2", "created": "Thu, 14 Jun 2007 15:18:30 GMT" } ]
"2007-06-14T00:00:00"
[ [ "Zwonek", "Wlodzimierz", "" ] ]
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704.0615
Trevor Bruen TB
Trevor Bruen, David Bryant
Parsimony via concensus
Final published version of article
Systematic Biology (2008), 57(2): 251-56
10.1080/10635150802040597
null
q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The parsimony score of a character on a tree equals the number of state changes required to fit that character onto the tree. We show that for unordered, reversible characters this score equals the number of tree rearrangements required to fit the tree onto the character. We discuss implications of this connection for the debate over the use of consensus trees or total evidence, and show how it provides a link between incongruence of characters and recombination.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:36:18 GMT" }, { "version": "v2", "created": "Thu, 5 Apr 2007 19:58:53 GMT" }, { "version": "v3", "created": "Fri, 6 Apr 2007 02:04:01 GMT" }, { "version": "v4", "created": "Sun, 29 Sep 2013 04:15:22 GMT" }, { "version": "v5", "created": "Tue, 1 Oct 2013 15:47:18 GMT" } ]
"2013-10-02T00:00:00"
[ [ "Bruen", "Trevor", "" ], [ "Bryant", "David", "" ] ]
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704.0616
Andrea Isella
A. Isella (INAF-Osservatorio Astrofisico di Arcetri), L. Testi (INAF-OAA), A. Natta (INAF-OAA), R. Neri (IRAM), D. Wilner (CFA), C. Qi (CFA)
Millimeter imaging of HD 163296: probing the disk structure and kinematics
Accepted for publication on A&A, 16 pages
null
10.1051/0004-6361:20077385
null
astro-ph
null
We present new multi-wavelength millimeter interferometric observations of the Herbig Ae star HD 163296 obtained with the IRAM/PBI, SMA and VLA arrays both in continuum and in the 12CO, 13CO and C18O emission lines. Gas and dust properties have been obtained comparing the observations with self-consistent disk models for the dust and CO emission. The circumstellar disk is resolved both in the continuum and in CO. We find strong evidence that the circumstellar material is in Keplerian rotation around a central star of 2.6 Msun. The disk inclination with respect to the line of sight is 46+-4 deg with a position angle of 128+-4 deg. The slope of the dust opacity measured between 0.87 and 7 mm (beta=1) confirms the presence of mm/cm-size grains in the disk midplane. The dust continuum emission is asymmetric and confined inside a radius of 200 AU while the CO emission extends up to 540 AU. The comparison between dust and CO temperature indicates that CO is present only in the disk interior. Finally, we obtain an increasing depletion of CO isotopomers from 12CO to 13CO and C18O. We argue that these results support the idea that the disk of HD 163296 is strongly evolved. In particular, we suggest that there is a strong depletion of dust relative to gas outside 200 AU; this may be due to the inward migration of large bodies that form in the outer disk or to clearing of a large gap in the dust distribution by a low mass companion.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:05:55 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Isella", "A.", "", "INAF-Osservatorio Astrofisico di Arcetri" ], [ "Testi", "L.", "", "INAF-OAA" ], [ "Natta", "A.", "", "INAF-OAA" ], [ "Neri", "R.", "", "IRAM" ], [ "Wilner", "D.", "", "CFA" ], [ "Qi", "C.", "", "CFA" ] ]
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704.0617
Anna Pietarila
A. Pietarila, H. Socas-Navarro and T. Bogdan
Spectropolarimetric observations of the Ca II 8498 A and 8542 A lines in the quiet Sun
23 pages, 17 figures, accepted to ApJ some figures are low-res, for high-res email annap@ucar.edu
null
10.1086/518714
null
astro-ph
null
The Ca II infrared triplet is one of the few magnetically sensitive chromospheric lines available for ground-based observations. We present spectropolarimetric observations of the 8498 A and 8542 A lines in a quiet Sun region near a decaying active region and compare the results with a simulation of the lines in a high plasma-beta regime. Cluster analysis of Stokes V profile pairs shows that the two lines, despite arguably being formed fairly close, often do not have similar shapes. In the network, the local magnetic topology is more important in determining the shapes of the Stokes V profiles than the phase of the wave, contrary to what our simulations show. We also find that Stokes V asymmetries are very common in the network, and the histograms of the observed amplitude and area asymmetries differ significantly from the simulation. Both the network and internetwork show oscillatory behavior in the Ca II lines. It is stronger in the network, where shocking waves, similar to those in the high-beta simulation, are seen and large self-reversals in the intensity profiles are common.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:15:11 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Pietarila", "A.", "" ], [ "Socas-Navarro", "H.", "" ], [ "Bogdan", "T.", "" ] ]
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704.0618
Concettina Galati
Concettina Galati
Number of moduli of irreducible families of plane curves with nodes and cusps
22 pages
Collect. Math. 57,3 (2006), 319 - 346
null
null
math.AG
null
Consider the family S of irreducible plane curves of degree n with d nodes and k cusps as singularities. Let W be an irreducible component of S. We consider the natural rational map from W to the moduli space of curves of genus g=(n-1)(n-2)/2-d-k. We define the "number of moduli of W" as the dimension of the image of W with respect to this map. If W has the expected dimension equal to 3n+g-1-k, then the number of moduli of W is at most equal to the min(3g-3, 3g-3+\rho-k), dove \rho is the Brill-Neother number of the linear series of degree n and dimension 2 on a smooth curve of genus g. We say that W has the expected number of moduli if the equality holds. In this paper we construct examples of families of irreducible plane curves with nodes and cusps as singularities having expected number of moduli and with non-positive Brill-Noether number.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:11:00 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Galati", "Concettina", "" ] ]
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704.0619
Sven Heinemeyer
S. Gennai, S. Heinemeyer, A. Kalinowski, R. Kinnunen, S. Lethi, A. Nikitenko, G. Weiglein
Search for Heavy Neutral MSSM Higgs Bosons with CMS: Reach and Higgs-Mass Precision
24 pages, 8 figures
Eur.Phys.J.C52:383-395,2007
10.1140/epjc/s10052-007-0398-0
DCPT/07/12, IPPP/07/06
hep-ph
null
The search for MSSM Higgs bosons will be an important goal at the LHC. We analyze the search reach of the CMS experiment for the heavy neutral MSSM Higgs bosons with an integrated luminosity of 30 or 60 fb^-1. This is done by combining the latest results for the CMS experimental sensitivities based on full simulation studies with state-of-the-art theoretical predictions of MSSM Higgs-boson properties. The results are interpreted in MSSM benchmark scenarios in terms of the parameters tan_beta and the Higgs-boson mass scale, M_A. We study the dependence of the 5 sigma discovery contours in the M_A-tan_beta plane on variations of the other supersymmetric parameters. The largest effects arise from a change in the higgsino mass parameter mu, which enters both via higher-order radiative corrections and via the kinematics of Higgs decays into supersymmetric particles. While the variation of $\mu$ can shift the prospective discovery reach (and correspondingly the ``LHC wedge'' region) by about Delta tan_beta = 10, we find that the discovery reach is rather stable with respect to the impact of other supersymmetric parameters. Within the discovery region we analyze the accuracy with which the masses of the heavy neutral Higgs bosons can be determined. We find that an accuracy of 1-4% should be achievable, which could make it possible in favourable regions of the MSSM parameter space to experimentally resolve the signals of the two heavy MSSM Higgs bosons at the LHC.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:19:41 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Gennai", "S.", "" ], [ "Heinemeyer", "S.", "" ], [ "Kalinowski", "A.", "" ], [ "Kinnunen", "R.", "" ], [ "Lethi", "S.", "" ], [ "Nikitenko", "A.", "" ], [ "Weiglein", "G.", "" ] ]
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704.062
Krzysztof Gesicki
K. Gesicki and A.A. Zijlstra
White dwarf masses derived from planetary nebulae modelling
4 pages, accepted for A&A Letters
null
10.1051/0004-6361:20077250
null
astro-ph
null
We compare the mass distribution of central stars of planetary nebulae (CSPN) with those of their progeny, white dwarfs (WD). We use a dynamical method to measure masses with an uncertainty of 0.02 M$_\odot$. The CSPN mass distribution is sharply peaked at $0.61 \rm M_\odot$. The WD distribution peaks at lower masses ($0.58 \rm M_\odot$) and shows a much broader range of masses. Some of the difference can be explained if the early post-AGB evolution is faster than predicted by the Bl\"ocker tracks. Between 30 and 50 per cent of WD may avoid the PN phase because of too low mass. However, the discrepancy cannot be fully resolved and WD mass distributions may have been broadened by observational or model uncertainties.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:22:05 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Gesicki", "K.", "" ], [ "Zijlstra", "A. A.", "" ] ]
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704.0621
Alexei Poltoratski
Mark Melnikov, Alexei Poltoratski and Alexander Volberg
Uniqueness theorems for Cauchy integrals
19 pages
null
null
null
math.CV math.AC
null
If $\mu$ is a finite complex measure in the complex plane $\C$ we denote by $C^\mu$ its Cauchy integral defined in the sense of principal value. The measure $\mu$ is called reflectionless if it is continuous (has no atoms) and $C^\mu=0$ at $\mu$-almost every point. We show that if $\mu$ is reflectionless and its Cauchy maximal function $C^\mu_*$ is summable with respect to $|\mu|$ then $\mu$ is trivial. An example of a reflectionless measure whose maximal function belongs to the "weak" $L^1$ is also constructed, proving that the above result is sharp in its scale. We also give a partial geometric description of the set of reflectionless measures on the line and discuss connections of our results with the notion of sets of finite perimeter in the sense of De Giorgi.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:26:10 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Melnikov", "Mark", "" ], [ "Poltoratski", "Alexei", "" ], [ "Volberg", "Alexander", "" ] ]
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704.0622
Concettina Galati
Concettina Galati
On the number of moduli of plane sextics with six cusps
9 pagine
null
null
null
math.AG
null
Let S be the variety of irreducible sextics with six cusps as singularities. Let W be one of irreducible components of W. Denoting by M_4 the space of moduli of smooth curves of genus 4, the moduli map of W is the rational map from W to M_4 sending the general point of W, corresponding to a plane curve D, to the point of M_4 parametrizing the normalization curve of D. The number of moduli of W is, by definition the dimension of the image of W with respect to the moduli map. We know that this number is at most equal to seven. In this paper we prove that both irreducible components of S have number of moduli exactly equal to seven.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:26:56 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Galati", "Concettina", "" ] ]
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704.0623
Edoardo Milotti
Edoardo Milotti
Algorithm for anisotropic diffusion in hydrogen-bonded networks
11 figures
null
null
null
cond-mat.soft
null
In this paper I describe a specialized algorithm for anisotropic diffusion determined by a field of transition rates. The algorithm can be used to describe some interesting forms of diffusion that occur in the study of proton motion in a network of hydrogen bonds. The algorithm produces data that require a nonstandard method of spectral analysis which is also developed here. Finally, I apply the algorithm to a simple specific example.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:30:42 GMT" } ]
"2009-04-16T00:00:00"
[ [ "Milotti", "Edoardo", "" ] ]
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704.0624
Timothy Bole
P. J. Rous, T. W. Bole
Temporal Evolution of Step-Edge Fluctuations Under Electromigration Conditions
7 pages, 5 figures
null
10.1103/PhysRevB.76.125435
null
cond-mat.mtrl-sci
null
The temporal evolution of step-edge fluctuations under electromigration conditions is analysed using a continuum Langevin model. If the electromigration driving force acts in the step up/down direction, and step-edge diffusion is the dominant mass-transport mechanism, we find that significant deviations from the usual $t^{1/4}$ scaling of the terrace-width correlation function occurs for a critical time $\tau$ which is dependent upon the three energy scales in the problem: $k_{B}T$, the step stiffness, $\gamma$, and the bias associated with adatom hopping under the influence of an electromigration force, $\pm \Delta U$. For ($t < \tau$), the correlation function evolves as a superposition of $t^{1/4}$ and $t^{3/4}$ power laws. For $t \ge \tau$ a closed form expression can be derived. This behavior is confirmed by a Monte-Carlo simulation using a discrete model of the step dynamics. It is proposed that the magnitude of the electromigration force acting upon an atom at a step-edge can by estimated by a careful analysis of the statistical properties of step-edge fluctuations on the appropriate time-scale.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:55:24 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Rous", "P. J.", "" ], [ "Bole", "T. W.", "" ] ]
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704.0625
Vladimir Kuksa
V.A.Beylin, V.I.Kuksa, G.M.Vereshkov, R.S.Pasechnik
Renormgroup origin and analysis of Split Higgsino scenario
16 pages, 1 figure
null
null
null
hep-ph
null
We present a renormalization group motivation of scale hierarchies in SUSY SU(5) model. The Split Higgsino scanrio with a high scale of the SUSY breaking is considered in detail. Its manifestations in experiments are discussed.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:35:12 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Beylin", "V. A.", "" ], [ "Kuksa", "V. I.", "" ], [ "Vereshkov", "G. M.", "" ], [ "Pasechnik", "R. S.", "" ] ]
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704.0626
Jason McEwen
J. D. McEwen, Y. Wiaux, M. P. Hobson, P. Vandergheynst, A. N. Lasenby
Probing dark energy with steerable wavelets through correlation of WMAP and NVSS local morphological measures
12 pages, 10 figures, replaced to match version accepted by MNRAS
Mon.Not.Roy.Astron.Soc. 384 (2008) 1289-1300
10.1111/j.1365-2966.2007.12776.x
null
astro-ph
null
Using local morphological measures on the sphere defined through a steerable wavelet analysis, we examine the three-year WMAP and the NVSS data for correlation induced by the integrated Sachs-Wolfe (ISW) effect. The steerable wavelet constructed from the second derivative of a Gaussian allows one to define three local morphological measures, namely the signed-intensity, orientation and elongation of local features. Detections of correlation between the WMAP and NVSS data are made with each of these morphological measures. The most significant detection is obtained in the correlation of the signed-intensity of local features at a significance of 99.9%. By inspecting signed-intensity sky maps, it is possible for the first time to see the correlation between the WMAP and NVSS data by eye. Foreground contamination and instrumental systematics in the WMAP data are ruled out as the source of all significant detections of correlation. Our results provide new insight on the ISW effect by probing the morphological nature of the correlation induced between the cosmic microwave background and large scale structure of the Universe. Given the current constraints on the flatness of the Universe, our detection of the ISW effect again provides direct and independent evidence for dark energy. Moreover, this new morphological analysis may be used in future to help us to better understand the nature of dark energy.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:39:41 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 11:34:46 GMT" } ]
"2008-03-04T00:00:00"
[ [ "McEwen", "J. D.", "" ], [ "Wiaux", "Y.", "" ], [ "Hobson", "M. P.", "" ], [ "Vandergheynst", "P.", "" ], [ "Lasenby", "A. N.", "" ] ]
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704.0627
Joao Pacheco B. C. de Melo Dr.
Fabiano P. Pereira (Instituto de Fisica, Universidade Federal Fluminense, Niteroi, RJ, Brazil), J. P. B. C. de Melo (Universidade Cruzeiro do Sul, CETEC, Sao Paulo, SP, Brazil), T. Frederico (Instituto Tecnologico de Aeronautica, Sao Jose dos Campos, SP, Brazil) and Lauro Tomio (Instituto de Fisica Teorica, UNESP, Sao Paulo, SP, Brazil)
Electromagnetic structure and weak decay of meson K in a light-front QCD-inspired
4 pages and 1 figure eps. To appear Nucl. Phys. A (2007)
Nucl.Phys.A610:610-613,2007
10.1016/j.nuclphysa.2007.03.103
null
hep-ph nucl-th
null
The kaon electromagnetic (e.m.) form factor is reviewed considering a light-front constituent quark model. In this approach, it is discussed the relevance of the quark-antiquark pair terms for the full covariance of the e.m. current. It is also verified, by considering a QCD dynamical model, that a good agreement with experimental data can be obtained for the kaon weak decay constant once a probability of about 80% of the valence component is taken into account.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:48:40 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Pereira", "Fabiano P.", "", "Instituto de Fisica, Universidade Federal\n Fluminense, Niteroi, RJ, Brazil" ], [ "de Melo", "J. P. B. C.", "", "Universidade Cruzeiro\n do Sul, CETEC, Sao Paulo, SP, Brazil" ], [ "Frederico", "T.", "", "Instituto Tecnologico de\n Aeronautica, Sao Jose dos Campos, SP, Brazil" ], [ "Tomio", "Lauro", "", "Instituto de\n Fisica Teorica, UNESP, Sao Paulo, SP, Brazil" ] ]
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704.0628
Bernard Kelly
Bernard J Kelly, Wolfgang Tichy, Manuela Campanelli, Bernard F Whiting
Black hole puncture initial data with realistic gravitational wave content
13 pages, 7 figures; replaced with published version
Phys.Rev.D76:024008,2007
10.1103/PhysRevD.76.024008
null
gr-qc
null
We present improved post-Newtonian-inspired initial data for non-spinning black-hole binaries, suitable for numerical evolution with punctures. We revisit the work of Tichy et al. [W. Tichy, B. Bruegmann, M. Campanelli, and P. Diener, Phys. Rev. D 67, 064008 (2003)], explicitly calculating the remaining integral terms. These terms improve accuracy in the far zone and, for the first time, include realistic gravitational waves in the initial data. We investigate the behavior of these data both at the center of mass and in the far zone, demonstrating agreement of the transverse-traceless parts of the new metric with quadrupole-approximation waveforms. These data can be used for numerical evolutions, enabling a direct connection between the merger waveforms and the post-Newtonian inspiral waveforms.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:43:04 GMT" }, { "version": "v2", "created": "Thu, 2 Aug 2007 21:12:47 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Kelly", "Bernard J", "" ], [ "Tichy", "Wolfgang", "" ], [ "Campanelli", "Manuela", "" ], [ "Whiting", "Bernard F", "" ] ]
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704.0629
Pamela Morehouse
CLEO Collaboration: M. Artuso, et al
Measurement of the Decay Constant $f_D{_S^+}$ using $D_S^+ --> ell^+ nu
6 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2007/
Phys.Rev.Lett.99:071802,2007
10.1103/PhysRevLett.99.071802
CLNS 07/1989, CLEO 07-1
hep-ex hep-lat hep-ph
null
We measure the decay constant fDs using the Ds -> l+ nu channel, where the l+ designates either a mu+ or a tau+, when the tau+ -> pi+ nu. Using both measurements we find fDs = 274 +-13 +- 7 MeV. Combining with our previous determination of fD+, we compute the ratio fDs/fD+ = 1.23 +- 0.11 +- 0.04. We compare with theoretical estimates.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 17:57:11 GMT" }, { "version": "v2", "created": "Thu, 16 Aug 2007 16:51:35 GMT" }, { "version": "v3", "created": "Fri, 17 Aug 2007 18:33:09 GMT" } ]
"2010-04-08T00:00:00"
[ [ "CLEO Collaboration", "", "" ], [ "Artuso", "M.", "" ] ]
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704.063
Evgeni Solodov P
The BABAR Collaboration: B. Aubert, et al
The $e^+ e^-\to K^+ K^- \pi^+\pi^-$, $K^+ K^- \pi^0\pi^0$ and $K^+ K^- K^+ K^-$ Cross Sections Measured with Initial-State Radiation
32 pages, 46 postscript figures, submitted to Phys.Rev.D
Phys.Rev.D76:012008,2007
10.1103/PhysRevD.76.012008
BABAR-PUB-07/021, SLAC-PUB-12435
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the processes $e^+ e^-\to K^+ K^- \pi^+\pi^-\gamma$, $K^+K^-\pi^0\pi^0\gamma$ and $K^+ K^- K^+ K^-\gamma$, where the photon is radiated from the initial state. About 34600, 4400 and 2300 fully reconstructed events, respectively, are selected from 232 \invfb of \babar data. The invariant mass of the hadronic final state defines the effective \epem center-of-mass energy, so that the $K^+ K^- \pi^+\pi^-\gamma$ data can be compared with direct measurements of the $e^+ e^-\to K^+K^- \pipi$ reaction; no direct measurements exist for the $e^+ e^-\to K^+ K^- \pi^0\pi^0$ or $\epem\to K^+ K^- K^+ K^-$ reactions. Studying the structure of these events, we find contributions from a number of intermediate states, and we extract their cross sections where possible. In particular, we isolate the contribution from $e^+ e^-\to\phi(1020) f_{0}(980)$ and study its structure near threshold. In the charmonium region, we observe the $J/\psi$ in all three final states and several intermediate states, as well as the $\psi(2S)$ in some modes, and measure the corresponding branching fractions. We see no signal for the Y(4260) and obtain an upper limit of $\BR_{Y(4260)\to\phi\pi^+\pi^-}\cdot\Gamma^{Y}_{ee}<0.4 \ev$ at 90% C.L.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:25:15 GMT" }, { "version": "v2", "created": "Tue, 1 May 2007 22:06:30 GMT" }, { "version": "v3", "created": "Mon, 23 Jun 2008 04:20:51 GMT" } ]
"2010-04-12T00:00:00"
[ [ "The BABAR Collaboration", "", "" ], [ "Aubert", "B.", "" ] ]
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704.0631
Antonio Soares de Castro
Antonio S. de Castro
Orthogonality criterion for banishing hydrino states from standard quantum mechanics
6 pages
Phys.Lett.A369:380-383,2007
10.1016/j.physleta.2007.05.006
null
hep-th quant-ph
null
Orthogonality criterion is used to shown in a very simple and general way that anomalous bound-state solutions for the Coulomb potential (hydrino states) do not exist as bona fide solutions of the Schr\"{o}dinger, Klein-Gordon and Dirac equations.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:11:03 GMT" }, { "version": "v2", "created": "Mon, 30 Apr 2007 16:11:35 GMT" } ]
"2008-11-26T00:00:00"
[ [ "de Castro", "Antonio S.", "" ] ]
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704.0632
Jason Steffen
Jason H. Steffen, B. Scott Gaudi, Eric B. Ford, Eric Agol, Mathew J. Holman
Detecting and Characterizing Planetary Systems with Transit Timing
7 pages, 2 figures, white paper submitted to the Exoplanet Task Force
null
null
null
astro-ph
null
In the coming decades, research in extrasolar planets aims to advance two goals: 1) detecting and characterizing low-mass planets increasingly similar to the Earth, and 2) improving our understanding of planet formation. We present a new planet detection method that is capable of making large advances towards both of these objectives and describe a modest network of telescopes that is able to make the requisite observations. In a system where a known planet transits its host star, a second planet in that system will cause the time between transits to vary. These transit timing variations can be used to infer the orbital elements and mass of the perturbing planet even if it has a mass that is smaller than the mass of the Earth. This detection technique complements other techniques because it is most sensitive in mean-motion resonances where, due to degeneracies, other techniques have reduced sensitivity. Small ground-based observatories have already exceeded the photometric precision necessary to detect sub-Earth mass planets. However, TTV planet searches are currently limited by the relatively small number of high-precision transit data and insufficient observing time on existing telescopes. These issues will be compounded as the number of known transiting planets suitable for TTV study will increase substantially in the near future. A relatively modest investment in a ground-based network of small ($\sim 0.5 {\rm m}$ telescopes could provide the needed coverage and so dramatically increase the effectiveness of transit timing observations.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:15:58 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Steffen", "Jason H.", "" ], [ "Gaudi", "B. Scott", "" ], [ "Ford", "Eric B.", "" ], [ "Agol", "Eric", "" ], [ "Holman", "Mathew J.", "" ] ]
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704.0633
Jim Hague
J.P.Hague
d-wave superconductivity from electron-phonon interactions
4 pages, 4 figures
Phys. Rev. B vol. 73, 060503(R) (2006)
10.1103/PhysRevB.73.060503
null
cond-mat.supr-con cond-mat.str-el
null
I examine electron-phonon mediated superconductivity in the intermediate coupling and phonon frequency regime of the quasi-2D Holstein model. I use an extended Migdal-Eliashberg theory which includes vertex corrections and spatial fluctuations. I find a d-wave superconducting state that is unique close to half-filling. The order parameter undergoes a transition to s-wave superconductivity on increasing filling. I explain how the inclusion of both vertex corrections and spatial fluctuations is essential for the prediction of a d-wave order parameter. I then discuss the effects of a large Coulomb pseudopotential on the superconductivity (such as is found in contemporary superconducting materials like the cuprates), which results in the destruction of the s-wave states, while leaving the d-wave states unmodified.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:27:55 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Hague", "J. P.", "" ] ]
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704.0634
Mark Bathe
Mark Bathe
A Finite Element framework for computation of protein normal modes and mechanical response
null
null
null
null
q-bio.BM q-bio.QM
null
A coarse-grained computational procedure based on the Finite Element Method is proposed to calculate the normal modes and mechanical response of proteins and their supramolecular assemblies. Motivated by the elastic network model, proteins are modeled as homogeneous isotropic elastic solids with volume defined by their solvent-excluded surface. The discretized Finite Element representation is obtained using a surface simplification algorithm that facilitates the generation of models of arbitrary prescribed spatial resolution. The procedure is applied to compute the normal modes of a mutant of T4 phage lysozyme and of filamentous actin, as well as the critical Euler buckling load of the latter when subject to axial compression. Results compare favorably with all-atom normal mode analysis, the Rotation Translation Blocks procedure, and experiment. The proposed methodology establishes a computational framework for the calculation of protein mechanical response that facilitates the incorporation of specific atomic-level interactions into the model, including aqueous-electrolyte-mediated electrostatic effects. The procedure is equally applicable to proteins with known atomic coordinates as it is to electron density maps of proteins, protein complexes, and supramolecular assemblies of unknown atomic structure.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:02:54 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Bathe", "Mark", "" ] ]
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704.0635
Shunji Matsuura
Shunji Matsuura, Shin-ichirou Fujimoto, Masa-aki Hashimoto, Katsuhiko Sato
Reply to 'Comment on 'Heavy element production in inhomogeneous big bang nucleosynthesis''
7 pages, 4 figures, References added, one more reference added
Phys.Rev.D75:068302,2007
10.1103/PhysRevD.75.068302
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is a reply report to astro-ph/0604264. We studied heavy element production in high baryon density region in early universe astro-ph/0507439. However it is claimed in astro-ph/0604264 that small scale but high baryon density region contradicts observations for the light element abundance or in order not to contradict to observations high density region must be so small that it cannot affect the present heavy element abundance. In this paper we study big bang nucleosynthesis in high baryon density region and show that in certain parameter spaces it is possible to produce enough amount of heavy element without contradiction to CMB and light element observations.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:30:36 GMT" }, { "version": "v2", "created": "Thu, 17 May 2007 12:50:29 GMT" }, { "version": "v3", "created": "Mon, 21 Jul 2008 05:03:40 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Matsuura", "Shunji", "" ], [ "Fujimoto", "Shin-ichirou", "" ], [ "Hashimoto", "Masa-aki", "" ], [ "Sato", "Katsuhiko", "" ] ]
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704.0636
Shaul Mukamel
Shaul Mukamel, Rafal Oszwaldowski, Darius Abramavicius
Sum-over-states vs quasiparticle pictures of coherent correlation spectroscopy of excitons in semiconductors; femtosecond analogues of multidimensional NMR
Accepted to Phys. Rev. B
null
10.1103/PhysRevB.75.245305
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Two-dimensional correlation spectroscopy (2DCS) based on the nonlinear optical response of excitons to sequences of ultrafast pulses, has the potential to provide some unique insights into carrier dynamics in semiconductors. The most prominent feature of 2DCS, cross peaks, can best be understood using a sum-over-states picture involving the many-body eigenstates. However, the optical response of semiconductors is usually calculated by solving truncated equations of motion for dynamical variables, which result in a quasiparticle picture. In this work we derive Green's function expressions for the four wave mixing signals generated in various phase-matching directions and use them to establish the connection between the two pictures. The formal connection with Frenkel excitons (hard-core bosons) and vibrational excitons (soft-core bosons) is pointed out.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:44:31 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Mukamel", "Shaul", "" ], [ "Oszwaldowski", "Rafal", "" ], [ "Abramavicius", "Darius", "" ] ]
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704.0637
Marcelo Lopez-Fuentes
M.C. Lopez Fuentes, P. Demoulin, J.A. Klimchuk
Are constant loop widths an artifact of the background and the spatial resolution?
Accepted for publication in ApJ
null
10.1086/523928
null
astro-ph
null
We study the effect of the coronal background in the determination of the diameter of EUV loops, and we analyze the suitability of the procedure followed in a previous paper (L\'opez Fuentes, Klimchuk & D\'emoulin 2006) for characterizing their expansion properties. For the analysis we create different synthetic loops and we place them on real backgrounds from data obtained with the Transition Region and Coronal Explorer (\textit{TRACE}). We apply to these loops the same procedure followed in our previous works, and we compare the results with real loop observations. We demonstrate that the procedure allows us to distinguish constant width loops from loops that expand appreciably with height, as predicted by simple force-free field models. This holds even for loops near the resolution limit. The procedure can easily determine when loops are below resolution limit and therefore not reliably measured. We find that small-scale variations in the measured loop width are likely due to imperfections in the background subtraction. The greatest errors occur in especially narrow loops and in places where the background is especially bright relative to the loop. We stress, however, that these effects do not impact the ability to measure large-scale variations. The result that observed loops do not expand systematically with height is robust.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:46:28 GMT" }, { "version": "v2", "created": "Mon, 24 Sep 2007 16:53:07 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Fuentes", "M. C. Lopez", "" ], [ "Demoulin", "P.", "" ], [ "Klimchuk", "J. A.", "" ] ]
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704.0638
Min Jeong Kim
CDF Collaboration
Polarizations of J/psi and psi(2S) Mesons Produced in ppbar Collisions at 1.96 TeV
8 pages, 7 figures, published in Physical Review Letters
Phys.Rev.Lett.99:132001,2007
10.1103/PhysRevLett.99.132001
FERMILAB-PUB-07-072-E
hep-ex
null
We have measured the polarizations of $\jpsi$ and $\psiprime$ mesons as functions of their transverse momentum $\pt$ when they are produced promptly in the rapidity range $|y|<0.6$ with $\pt \geq 5 \pgev$. The analysis is performed using a data sample with an integrated luminosity of about $800 \ipb$ collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as $\pt$ increases from 5 to $30 \pgev$. These results are compared to the predictions of nonrelativistic quantum chromodynamics and other contemporary models. The effective polarizations of $\jpsi$ and $\psiprime$ mesons from $B$-hadron decays are also reported.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 18:55:03 GMT" }, { "version": "v2", "created": "Mon, 12 Nov 2007 20:25:59 GMT" } ]
"2012-08-27T00:00:00"
[ [ "CDF Collaboration", "", "" ] ]
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704.0639
Matteo G. A. Paris
Marco G. Genoni, Matteo G. A. Paris, Konrad Banaszek
A measure of the non-Gaussian character of a quantum state
revised and enlarged version, 7 pages, 4 figures
Phys. Rev. A 76, 042327 (2007)
10.1103/PhysRevA.76.042327
null
quant-ph
null
We address the issue of quantifying the non-Gaussian character of a bosonic quantum state and introduce a non-Gaussianity measure based on the Hilbert-Schmidt distance between the state under examination and a reference Gaussian state. We analyze in details the properties of the proposed measure and exploit it to evaluate the non-Gaussianity of some relevant single- and multi-mode quantum states. The evolution of non-Gaussianity is also analyzed for quantum states undergoing the processes of Gaussification by loss and de-Gaussification by photon-subtraction. The suggested measure is easily computable for any state of a bosonic system and allows to define a corresponding measure for the non-Gaussian character of a quantum operation.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:06:14 GMT" }, { "version": "v2", "created": "Thu, 19 Apr 2007 20:31:34 GMT" }, { "version": "v3", "created": "Tue, 17 Jul 2007 16:53:17 GMT" }, { "version": "v4", "created": "Tue, 2 Oct 2007 20:36:13 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Genoni", "Marco G.", "" ], [ "Paris", "Matteo G. A.", "" ], [ "Banaszek", "Konrad", "" ] ]
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704.064
Dragomir Z. Djokovic
Dragomir Z. Djokovic
Skew-Hadamard matrices of orders 188 and 388 exist
7 pages, no figures, a paragraph added to the introduction, two misprints corrected. To appear in the International Mathematical Forum
International Mathematical Forum 3 (2008), no. 22, 1063-1068
null
null
math.CO
null
We construct several difference families on cyclic groups of orders 47 and 97, and use them to construct skew-Hadamard matrices of orders 188 and 388. Such difference families and matrices are constructed here for the first time. The matrices are constructed by using the Goethals-Seidel array.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:09:27 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 04:51:57 GMT" } ]
"2009-03-18T00:00:00"
[ [ "Djokovic", "Dragomir Z.", "" ] ]
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704.0641
Diego Porras
D. Porras, J.I. Cirac
Quantum engineering of photon states with entangled atomic ensembles
6 pages, 3 figures
null
null
null
quant-ph
null
We propose and analyze a new method to produce single and entangled photons which does not require cavities. It relies on the collective enhancement of light emission as a consequence of the presence of entanglement in atomic ensembles. Light emission is triggered by a laser pulse, and therefore our scheme is deterministic. Furthermore, it allows one to produce a variety of photonic entangled states by first preparing certain atomic states using simple sequences of quantum gates. We analyze the feasibility of our scheme, and particularize it to: ions in linear traps, atoms in optical lattices, and in cells at room temperature.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:19:06 GMT" }, { "version": "v2", "created": "Wed, 4 Apr 2007 20:14:02 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Porras", "D.", "" ], [ "Cirac", "J. I.", "" ] ]
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704.0642
A. H. Rezaeian
B. Z. Kopeliovich, A. H. Rezaeian, H. J. Pirner, Ivan Schmidt
Direct photons and dileptons via color dipoles
7 pages, 4 figures. Results unchanged, two new plots added to show (data-theory)/theory, NLO pQCD curve is added. To appear in PLB
Phys.Lett.B653:210-215,2007
10.1016/j.physletb.2007.07.055
USM-TH-210
hep-ph nucl-th
null
Drell-Yan dilepton pair production and inclusive direct photon production can be described within a unified framework in the color dipole approach. The inclusion of non-perturbative primordial transverse momenta and DGLAP evolution is studied. We successfully describe data for dilepton spectra from 800-GeV pp collisions, inclusive direct photon spectra for pp collisions at RHIC energies $\sqrt{s}=200$ GeV, and for $p\bar{p}$ collisions at Tevatron energies $\sqrt{s}=1.8$ TeV, in a formalism that is free from any extra parameters.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 19:58:03 GMT" }, { "version": "v2", "created": "Tue, 24 Jul 2007 21:47:50 GMT" } ]
"2010-03-25T00:00:00"
[ [ "Kopeliovich", "B. Z.", "" ], [ "Rezaeian", "A. H.", "" ], [ "Pirner", "H. J.", "" ], [ "Schmidt", "Ivan", "" ] ]
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704.0643
Esther M. Hu
Yuko Kakazu, Lennox L. Cowie, and Esther M. Hu (Univ. of Hawaii, Inst. for Astronomy)
Mapping the Youngest Galaxies to Redshift One
18 pages, 20 figures (with 2 color plates), aastex, emulateapj,submitted to the Astrophysical Journal
null
null
null
astro-ph
null
We describe results of a narrow band search for ultra-strong emission line galaxies (USELs) with EW(H beta) > 30 A. 542 candidate galaxies are found in a half square degree survey using two ~100 Angstrom 8150 A and 9140 A filters with Subaru/SuprimeCam. Followup spectroscopy for randomly selected objects in the sample with KeckII/DEIMOS shows they consist of [OIII] 5007, [OII] 3727, and H alpha selected strong-emission line galaxies at intermediate redshifts (z < 1), and Ly alpha emitting galaxies at high-redshift (z >> 5). We determine the H beta luminosity functions and the star formation density of the USELs, which is 5-10% of the value found from ultraviolet continuum objects at z=0-1, suggesting they correspond to a major epoch in galaxy formation at these redshifts. Many USELs show the temperature-sensitive [OIII] 4363 auroral lines and about a dozen have oxygen abundances characteristic of eXtremely Metal Poor Galaxies (XMPGs). These XMPGs are the most distant known today. Our high yield rate of XMPGs suggests this is a powerful method for finding such populations. The lowest metallicity measured in our sample is 12+log(O/H) = 7.06 (6.78-7.44), close to the minimum metallicity found in local galaxies. The luminosities, metallicities and star formation rates of USELs are consistent with the strong emitters being start-up intermediate mass galaxies and suggest that galaxies are still forming in relatively chemically pristine sites at z < 1.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:52:53 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Kakazu", "Yuko", "", "Univ. of Hawaii, Inst.\n for Astronomy" ], [ "Cowie", "Lennox L.", "", "Univ. of Hawaii, Inst.\n for Astronomy" ], [ "Hu", "Esther M.", "", "Univ. of Hawaii, Inst.\n for Astronomy" ] ]
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704.0644
Iain Moffatt
Iain Moffatt
On the HOMFLY and Tutte polynomials
This paper has been withdrawn due to an error in Lemma 8
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A celebrated result of F. Jaeger states that the Tutte polynomial of a planar graph is determined by the HOMFLY polynomial of an associated link. Here we are interested in the converse of this result. We consider the question `to what extent does the Tutte polynomial determine the HOMFLY polynomial of any knot?' We show that the HOMFLY polynomial of a knot is determined by Tutte polynomials of plane graphs associated to the knot.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:10:53 GMT" }, { "version": "v2", "created": "Mon, 30 Jun 2008 16:04:39 GMT" } ]
"2008-06-30T00:00:00"
[ [ "Moffatt", "Iain", "" ] ]
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704.0645
Paul Kalas
Paul Kalas, Michael P. Fitzgerald and James R. Graham (University of California, Berkeley)
Discovery of extreme asymmetry in the debris disk surrounding HD 15115
4 pages, 3 figures, ApJ Letters, accepted
null
10.1086/518652
null
astro-ph
null
We report the first scattered light detection of a dusty debris disk surrounding the F2V star HD 15115 using the Hubble Space Telescope in the optical, and Keck adaptive optics in the near-infrared. The most remarkable property of the HD 15115 disk relative to other debris disks is its extreme length asymmetry. The east side of the disk is detected to ~315 AU radius, whereas the west side of the disk has radius >550 AU. We find a blue optical to near-infrared scattered light color relative to the star that indicates grain scattering properties similar to the AU Mic debris disk. The existence of a large debris disk surrounding HD 15115 adds further evidence for membership in the Beta Pic moving group, which was previously argued based on kinematics alone. Here we hypothesize that the extreme disk asymmetry is due to dynamical perturbations from HIP 12545, an M star 0.5 degrees (0.38 pc) east of HD 15115 that shares a common proper motion vector, heliocentric distance, galactic space velocity, and age.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:00:12 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Kalas", "Paul", "", "University of\n California, Berkeley" ], [ "Fitzgerald", "Michael P.", "", "University of\n California, Berkeley" ], [ "Graham", "James R.", "", "University of\n California, Berkeley" ] ]
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704.0646
Max Tegmark
Max Tegmark (MIT)
The Mathematical Universe
Replaced to match accepted Found. Phys. version, 31 pages, 5 figs; more details at http://space.mit.edu/home/tegmark/toe.html
Found.Phys.38:101-150,2008
10.1007/s10701-007-9186-9
null
gr-qc astro-ph hep-th
null
I explore physics implications of the External Reality Hypothesis (ERH) that there exists an external physical reality completely independent of us humans. I argue that with a sufficiently broad definition of mathematics, it implies the Mathematical Universe Hypothesis (MUH) that our physical world is an abstract mathematical structure. I discuss various implications of the ERH and MUH, ranging from standard physics topics like symmetries, irreducible representations, units, free parameters, randomness and initial conditions to broader issues like consciousness, parallel universes and Godel incompleteness. I hypothesize that only computable and decidable (in Godel's sense) structures exist, which alleviates the cosmological measure problem and help explain why our physical laws appear so simple. I also comment on the intimate relation between mathematical structures, computations, simulations and physical systems.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 14:47:46 GMT" }, { "version": "v2", "created": "Mon, 8 Oct 2007 22:59:39 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Tegmark", "Max", "", "MIT" ] ]
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704.0647
Andrei Linde
Renata Kallosh and Andrei Linde
Testing String Theory with CMB
13 pages, 2 figures
JCAP 0704:017,2007
10.1088/1475-7516/2007/04/017
SU-ITP-2007-4
hep-th astro-ph gr-qc hep-ph
null
Future detection/non-detection of tensor modes from inflation in CMB observations presents a unique way to test certain features of string theory. Current limit on the ratio of tensor to scalar perturbations, r=T/S, is r < 0.3, future detection may take place for r > 10^{-2}-10^{-3}. At present all known string theory inflation models predict tensor modes well below the level of detection. Therefore a possible experimental discovery of tensor modes may present a challenge to string cosmology. The strongest bound on r in string inflation follows from the observation that in most of the models based on the KKLT construction, the value of the Hubble constant H during inflation must be smaller than the gravitino mass. For the gravitino mass in the usual range, m_{3/2} < O(1) TeV, this leads to an extremely strong bound r < 10^{-24}. A discovery of tensor perturbations with r > 10^{-3} would imply that the gravitinos in this class of models are superheavy, m_{3/2} > 10^{13} GeV. This would have important implications for particle phenomenology based on string theory.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 04:42:42 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Kallosh", "Renata", "" ], [ "Linde", "Andrei", "" ] ]
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704.0648
Kaushik Majumdar
Kaushik Majumdar
Behavioral response to strong aversive stimuli: A neurodynamical model
Submitted to journal
null
null
null
q-bio.NC
null
In this paper a theoretical model of functioning of a neural circuit during a behavioral response has been proposed. A neural circuit can be thought of as a directed multigraph whose each vertex is a neuron and each edge is a synapse. It has been assumed in this paper that the behavior of such circuits is manifested through the collective behavior of neurons belonging to that circuit. Behavioral information of each neuron is contained in the coefficients of the fast Fourier transform (FFT) over the output spike train. Those coefficients form a vector in a multidimensional vector space. Behavioral dynamics of a neuronal network in response to strong aversive stimuli has been studied in a vector space in which a suitable pseudometric has been defined. The neurodynamical model of network behavior has been formulated in terms of existing memory, synaptic plasticity and feelings. The model has an analogy in classical electrostatics, by which the notion of force and potential energy has been introduced. Since the model takes input from each neuron in a network and produces a behavior as the output, it would be extremely difficult or may even be impossible to implement. But with the help of the model a possible explanation for an hitherto unexplained neurological observation in human brain has been offered. The model is compatible with a recent model of sequential behavioral dynamics. The model is based on electrophysiology, but its relevance to hemodynamics has been outlined.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:04:02 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Majumdar", "Kaushik", "" ] ]
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704.0649
Andrei Zelevinsky
Harm Derksen, Jerzy Weyman, Andrei Zelevinsky
Quivers with potentials and their representations I: Mutations
58 pages; v.2: a typo fixed, references rearranged in the correct alphabetical order, an acknowledgment added; v.3: more typos fixed, minor editorial improvements; v.4: minor editorial changes, final version to appear in Selecta Math
null
null
null
math.RA math.RT
null
We study quivers with relations given by non-commutative analogs of Jacobian ideals in the complete path algebra. This framework allows us to give a representation-theoretic interpretation of quiver mutations at arbitrary vertices. This gives a far-reaching generalization of Bernstein-Gelfand-Ponomarev reflection functors. The motivations for this work come from several sources: superpotentials in physics, Calabi-Yau algebras, cluster algebras.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:04:32 GMT" }, { "version": "v2", "created": "Wed, 18 Apr 2007 19:25:43 GMT" }, { "version": "v3", "created": "Fri, 13 Jul 2007 15:58:36 GMT" }, { "version": "v4", "created": "Mon, 21 Apr 2008 14:49:14 GMT" } ]
"2008-04-21T00:00:00"
[ [ "Derksen", "Harm", "" ], [ "Weyman", "Jerzy", "" ], [ "Zelevinsky", "Andrei", "" ] ]
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704.065
Ivar Martin
D. Mozyrsky, I. Martin, E. Timmermans
Coherent macroscopic quantum tunneling in boson-fermion mixtures
4 pages, 3 figures
Phys. Rev. A 76, 051601(R) (2007)
10.1103/PhysRevA.76.051601
null
cond-mat.mes-hall cond-mat.str-el
null
We show that the cold atom systems of simultaneously trapped Bose-Einstein condensates (BEC's) and quantum degenerate fermionic atoms provide promising laboratories for the study of macroscopic quantum tunneling. Our theoretical studies reveal that the spatial extent of a small trapped BEC immersed in a Fermi sea can tunnel and coherently oscillate between the values of the separated and mixed configurations (the phases of the phase separation transition of BEC-fermion systems). We evaluate the period, amplitude and dissipation rate for $^{23}$Na and $^{40}$K-atoms and we discuss the experimental prospects for observing this phenomenon.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:05:57 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Mozyrsky", "D.", "" ], [ "Martin", "I.", "" ], [ "Timmermans", "E.", "" ] ]
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704.0651
Ivar Martin
D. Mozyrsky and I. Martin
Efficiency of thin film photocells
5 pages, 3 figures
Optics Communications, vol.277, p.109-13 (2007)
10.1016/j.optcom.2007.04.062
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
We propose a new concept for the design of high-efficiency photocells based on ultra-thin (submicron) semiconductor films of controlled thickness. Using a microscopic model of a thin dielectric layer interacting with incident electromagnetic radiation we evaluate the efficiency of conversion of solar radiation into the electric power. We determine the optimal range of parameters which maximize the efficiency of such photovoltaic element.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:07:20 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Mozyrsky", "D.", "" ], [ "Martin", "I.", "" ] ]
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704.0652
Daisuke Kawata
Daisuke Kawata (1,2), Michael Rauch (1) ((1) Carnegie Observatories, (2) Swinburne)
Galactic Wind Signatures around High Redshift Galaxies
16 pages, 16 figures, ApJ in press. Higher resolution version available at http://www.ociw.edu/~dkawata/research/papers.html
Astrophys.J.663:38-52,2007
10.1086/518644
null
astro-ph
null
We carry out cosmological chemodynamical simulations with different strengths of supernova (SN) feedback and study how galactic winds from star-forming galaxies affect the features of hydrogen (HI) and metal (CIV and OVI) absorption systems in the intergalactic medium at high redshift. We find that the outflows tend to escape to low density regions, and hardly affect the dense filaments visible in HI absorption. As a result, the strength of HI absorption near galaxies is not reduced by galactic winds, but even slightly increases. We also find that a lack of HI absorption for lines of sight (LOS) close to galaxies, as found by Adelberger et al., can be created by hot gas around the galaxies induced by accretion shock heating. In contrast to HI, metal absorption systems are sensitive to the presence of winds. The models without feedback can produce the strong CIV and OVI absorption lines in LOS within 50 kpc from galaxies, while strong SN feedback is capable of creating strong CIV and OVI lines out to about twice that distance. We also analyze the mean transmissivity of HI, CIV, and OVI within 1 h$^{-1}$ Mpc from star-forming galaxies. The probability distribution of the transmissivity of HI is independent of the strength of SN feedback, but strong feedback produces LOS with lower transmissivity of metal lines. Additionally, strong feedback can produce strong OVI lines even in cases where HI absorption is weak. We conclude that OVI is probably the best tracer for galactic winds at high redshift.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:08:30 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Kawata", "Daisuke", "" ], [ "Rauch", "Michael", "" ] ]
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704.0653
Hanns-Christoph Naegerl
M. Mark, T. Kraemer, P. Waldburger, J. Herbig, C. Chin, H.-C. Naegerl, R. Grimm
`St\"uckelberg interferometry' with ultracold molecules
4 pages, 5 figures
Phys. Rev. Lett. 99, 113201 (2007)
10.1103/PhysRevLett.99.113201
null
cond-mat.other
null
We report on the realization of a time-domain `St\"uckelberg interferometer', which is based on the internal state structure of ultracold Feshbach molecules. Two subsequent passages through a weak avoided crossing between two different orbital angular momentum states in combination with a variable hold time lead to high-contrast population oscillations. This allows for a precise determination of the energy difference between the two molecular states. We demonstrate a high degree of control over the interferometer dynamics. The interferometric scheme provides new possibilities for precision measurements with ultracold molecules.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:36:42 GMT" } ]
"2007-09-24T00:00:00"
[ [ "Mark", "M.", "" ], [ "Kraemer", "T.", "" ], [ "Waldburger", "P.", "" ], [ "Herbig", "J.", "" ], [ "Chin", "C.", "" ], [ "Naegerl", "H. -C.", "" ], [ "Grimm", "R.", "" ] ]
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704.0654
Lise Christensen
L. Christensen, L. Wisotzki, M. M. Roth, S. F. Sanchez, A. Kelz, K. Jahnke
An integral field spectroscopic survey for high redshift damped Lyman-alpha galaxies
19 pages, 10 figures, accepted for publication in Astronomy & Astrophysics
Astron.Astrophys. 468 (2007) 587-601
10.1051/0004-6361:20066410
null
astro-ph
null
We search for galaxy counterparts to damped Lyman-alpha absorbers (DLAs) at z>2 towards nine quasars, which have 14 DLAs and 8 sub-DLAs in their spectra. We use integral field spectroscopy to search for Ly-alpha emission line objects at the redshifts of the absorption systems. Besides recovering two previously confirmed objects, we find six statistically significant candidate Ly-alpha emission line objects. The candidates are identified as having wavelengths close to the DLA line where the background quasar emission is absorbed. In comparison with the six currently known Ly-alpha emitting DLA galaxies the candidates have similar line fluxes and line widths, while velocity offsets between the emission lines and systemic DLA redshifts are larger. The impact parameters are larger than 10 kpc, and lower column density systems are found at larger impact parameters. Assuming that a single gas cloud extends from the QSO line of sight to the location of the candidate emission line, we find that the average candidate DLA galaxy is surrounded by neutral gas with an exponential scale length of ~5 kpc.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:48:57 GMT" } ]
"2007-06-13T00:00:00"
[ [ "Christensen", "L.", "" ], [ "Wisotzki", "L.", "" ], [ "Roth", "M. M.", "" ], [ "Sanchez", "S. F.", "" ], [ "Kelz", "A.", "" ], [ "Jahnke", "K.", "" ] ]
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704.0655
Branimir Sesar
Branimir Sesar, Zeljko Ivezic, Robert H. Lupton, Mario Juric, James E. Gunn, Gillian R. Knapp, Nathan De Lee, J. Allyn Smith, Gajus Miknaitis, Huan Lin, Douglas Tucker, Mamoru Doi, Masayuki Tanaka, Masataka Fukugita, Jon Holtzman, Steve Kent, Brian Yanny, David Schlegel, Douglas Finkbeiner, Nikhil Padmanabhan, Constance M. Rockosi, Nicholas Bond, Brian Lee, Chris Stoughton, Sebastian Jester, Hugh Harris, Paul Harding, Jon Brinkmann, Donald P. Schneider, Donald York, Michael W. Richmond, Daniel Vanden Berk
Exploring the Variable Sky with the Sloan Digital Sky Survey
41 pages, 14 figures, submitted to Astronomical Journal
Astron.J.134:2236-2251,2007
10.1086/521819
null
astro-ph
null
We quantify the variability of faint unresolved optical sources using a catalog based on multiple SDSS imaging observations. The catalog covers SDSS Stripe 82, and contains 58 million photometric observations in the SDSS ugriz system for 1.4 million unresolved sources. In each photometric bandpass we compute various low-order lightcurve statistics and use them to select and study variable sources. We find that 2% of unresolved optical sources brighter than g=20.5 appear variable at the 0.05 mag level (rms) simultaneously in the g and r bands. The majority (2/3) of these variable sources are low-redshift (<2) quasars, although they represent only 2% of all sources in the adopted flux-limited sample. We find that at least 90% of quasars are variable at the 0.03 mag level (rms) and confirm that variability is as good a method for finding low-redshift quasars as is the UV excess color selection (at high Galactic latitudes). We analyze the distribution of lightcurve skewness for quasars and find that is centered on zero. We find that about 1/4 of the variable stars are RR Lyrae stars, and that only 0.5% of stars from the main stellar locus are variable at the 0.05 mag level. The distribution of lightcurve skewness in the g-r vs. u-g color-color diagram on the main stellar locus is found to be bimodal (with one mode consistent with Algol-like behavior). Using over six hundred RR Lyrae stars, we demonstrate rich halo substructure out to distances of 100 kpc. We extrapolate these results to expected performance by the Large Synoptic Survey Telescope and estimate that it will obtain well-sampled 2% accurate, multi-color lightcurves for ~2 million low-redshift quasars, and will discover at least 50 million variable stars.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:23:22 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Sesar", "Branimir", "" ], [ "Ivezic", "Zeljko", "" ], [ "Lupton", "Robert H.", "" ], [ "Juric", "Mario", "" ], [ "Gunn", "James E.", "" ], [ "Knapp", "Gillian R.", "" ], [ "De Lee", "Nathan", "" ], [ "Smith", "J. Allyn", "" ], [ "Miknaitis", "Gajus", "" ], [ "Lin", "Huan", "" ], [ "Tucker", "Douglas", "" ], [ "Doi", "Mamoru", "" ], [ "Tanaka", "Masayuki", "" ], [ "Fukugita", "Masataka", "" ], [ "Holtzman", "Jon", "" ], [ "Kent", "Steve", "" ], [ "Yanny", "Brian", "" ], [ "Schlegel", "David", "" ], [ "Finkbeiner", "Douglas", "" ], [ "Padmanabhan", "Nikhil", "" ], [ "Rockosi", "Constance M.", "" ], [ "Bond", "Nicholas", "" ], [ "Lee", "Brian", "" ], [ "Stoughton", "Chris", "" ], [ "Jester", "Sebastian", "" ], [ "Harris", "Hugh", "" ], [ "Harding", "Paul", "" ], [ "Brinkmann", "Jon", "" ], [ "Schneider", "Donald P.", "" ], [ "York", "Donald", "" ], [ "Richmond", "Michael W.", "" ], [ "Berk", "Daniel Vanden", "" ] ]
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704.0656
Delfim F. M. Torres
Rui A. C. Ferreira, Delfim F. M. Torres
Necessary optimality conditions for the calculus of variations on time scales
20 pages
null
null
CM07/I-03
math.OC math.CA
null
We study more general variational problems on time scales. Previous results are generalized by proving necessary optimality conditions for (i) variational problems involving delta derivatives of more than the first order, and (ii) problems of the calculus of variations with delta-differential side conditions (Lagrange problem of the calculus of variations on time scales).
[ { "version": "v1", "created": "Wed, 4 Apr 2007 20:31:16 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Ferreira", "Rui A. C.", "" ], [ "Torres", "Delfim F. M.", "" ] ]
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704.0657
Jonathan Slavin
Jonathan D. Slavin and Priscilla C. Frisch
The Boundary Conditions of the Heliosphere: Photoionization Models Constrained by Interstellar and In Situ Data
14 pages, 4 figures, submitted to Astronomy & Astrophysics together with papers from the International Space Sciences Institute workshop on Interstellar Hydrogen in the Heliosphere
null
10.1051/0004-6361:20078101
null
astro-ph
null
The boundary conditions of the heliosphere are set by the ionization, density and composition of inflowing interstellar matter. Constraining the properties of the Local Interstellar Cloud (LIC) at the heliosphere requires radiative transfer ionization models. We model the background interstellar radiation field using observed stellar FUV and EUV emission and the diffuse soft X-ray background. We also model the emission from the boundary between the LIC and the hot Local Bubble (LB) plasma, assuming that the cloud is evaporating because of thermal conduction. We create a grid of models covering a plausible range of LIC and LB properties, and use the modeled radiation field as input to radiative transfer/thermal equilibrium calculations using the Cloudy code. Data from in situ observations of He^O, pickup ions and anomalous cosmic rays in the heliosphere, and absorption line measurements towards epsilon CMa were used to constrain the input parameters. A restricted range of assumed LIC HI column densities and LB plasma temperatures produce models that match all the observational constraints. The relative weakness of the constraints on N(HI) and T_h contrast with the narrow limits predicted for the H^O and electron density in the LIC at the Sun, n(H^0) = 0.19 - 0.20 cm^-3, and n(e) = 0.07 +/- 0.01 cm^-3. Derived abundances are mostly typical for low density gas, with sub-solar Mg, Si and Fe, possibly subsolar O and N, and S about solar; however C is supersolar. The interstellar gas at the Sun is warm, low density, and partially ionized, with n(H) = 0.23 - 0.27 cm^-3, T = 6300 K, X(H^+) ~ 0.2, and X(He^+) ~ 0.4. These results appear to be robust since acceptable models are found for substantially different input radiation fields. Our results favor low values for the reference solar abundances for the LIC composition.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 13:27:34 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 16:26:58 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Slavin", "Jonathan D.", "" ], [ "Frisch", "Priscilla C.", "" ] ]
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704.0658
Sergey Dickmann
S. Dickmann, V. Fleurov, K. Kikoin
Collective excitations in a magnetically doped quantized Hall ferromagnet
32 pages including 7 figures. To be published in Phys. Rev. B
Phys. Rev. B 76, 205309 (2007)
10.1103/PhysRevB.76.205309
null
cond-mat.mes-hall cond-mat.str-el
null
A theory of collective states in a magnetically quantized two-dimensional electron gas (2DEG) with half-filled Landau level (quantized Hall ferromagnet) in the presence of magnetic 3d impurities is developed. The spectrum of bound and delocalized spin-excitons as well as the renormalization of Zeeman splitting of the impurity 3d levels due to the indirect exchange interaction with the 2DEG are studied for the specific case of n-type GaAs doped with Mn where the Lande` g-factors of impurity and 2DEG have opposite signs. If the sign of the 2DEG g-factor is changed due to external influences, then impurity related transitions to new ground state phases, presenting various spin-flip and skyrmion-like textures, are possible. Conditions for existence of these phases are discussed. PACS: 73.43.Lp, 73.21.Fg, 72.15.Rn
[ { "version": "v1", "created": "Wed, 4 Apr 2007 22:04:07 GMT" }, { "version": "v2", "created": "Wed, 29 Aug 2007 15:27:48 GMT" }, { "version": "v3", "created": "Thu, 24 Jan 2008 16:22:30 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Dickmann", "S.", "" ], [ "Fleurov", "V.", "" ], [ "Kikoin", "K.", "" ] ]
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704.0659
Edward van den Heuvel
E.P.J. van den Heuvel, S.-C. Yoon
Long Gamma-Ray Burst Progenitors: Boundary Conditions and Binary Models
8 pp., 2 figs, Proceedings of 5th Stromlo Symposium
Astrophys.Space Sci.311:177-183,2007
10.1007/s10509-007-9583-8
null
astro-ph
null
The observed association of Long Gamma-Ray Bursts (LGRBs) with peculiar Type Ic supernovae gives support to Woosley`s collapsar/hypernova model, in which the GRB is produced by the collapse of the rapidly rotating core of a massive star to a black hole. The association of LGRBs with small star-forming galaxies suggests low-metallicity to be a condition for a massive star to evolve to the collapsar stage. Both completely-mixed single star models and binary star models are possible. In binary models the progenitor of the GRB is a massive helium star with a close companion. We find that tidal synchronization during core-helium burning is reached on a short timescale (less than a few millennia). However, the strong core-envelope coupling in the subsequent evolutionary stages is likely to rule out helium stars with main-sequence companions as progenitors of hypernovae/GRBs. On the other hand, helium stars in close binaries with a neutron-star or black-hole companion can, despite the strong core-envelope coupling in the post-helium burning phase, retain sufficient core angular momentum to produce a hypernova/GRB.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 22:30:42 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Heuvel", "E. P. J. van den", "" ], [ "Yoon", "S. -C.", "" ] ]
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704.066
Ryan Barnett
Ryan Barnett, Paul Maragakis, Ari Turner, Maria Fyta, Efthimios Kaxiras
Multiscale model of electronic behavior and localization in stretched dry DNA
13 Pages, 9 Figures. Review-style article to be published in special issue of Journal of Materials Science
J. Mater. Sci. 42, 8894 (2007).
10.1007/s10853-007-1901-6
null
cond-mat.mtrl-sci cond-mat.str-el
null
When the DNA double helix is subjected to external forces it can stretch elastically to elongations reaching 100% of its natural length. These distortions, imposed at the mesoscopic or macroscopic scales, have a dramatic effect on electronic properties at the atomic scale and on electrical transport along DNA. Accordingly, a multiscale approach is necessary to capture the electronic behavior of the stretched DNA helix. To construct such a model, we begin with accurate density-functional-theory calculations for electronic states in DNA bases and base pairs in various relative configurations encountered in the equilibrium and stretched forms. These results are complemented by semi-empirical quantum mechanical calculations for the states of a small size [18 base pair poly(CG)-poly(CG)] dry, neutral DNA sequence, using previously published models for stretched DNA. The calculated electronic states are then used to parametrize an effective tight-binding model that can describe electron hopping in the presence of environmental effects, such as the presence of stray water molecules on the backbone or structural features of the substrate. These effects introduce disorder in the model hamiltonian which leads to electron localization. The localization length is smaller by several orders of magnitude in stretched DNA relative to that in the unstretched structure.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 06:15:52 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Barnett", "Ryan", "" ], [ "Maragakis", "Paul", "" ], [ "Turner", "Ari", "" ], [ "Fyta", "Maria", "" ], [ "Kaxiras", "Efthimios", "" ] ]
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704.0661
Tommaso de Fernex
Mauro C. Beltrametti, Tommaso de Fernex, Antonio Lanteri
Ample subvarieties and rationally connected fibrations
27 pages; v2: minor changes and corrections following the referee's comments. v3: few typos corrected. To appear in Math. Ann
null
null
null
math.AG
null
Under some positivity assumptions, extension properties of rationally connected fibrations from a submanifold to its ambient variety are studied. Given a family of rational curves on a complex projective manifold X inducing a covering family on a submanifold Y with ample normal bundle in X, the main results relate, under suitable conditions, the associated rational connected fiber structures on X and on Y. Applications of these results include an extension theorem for Mori contractions of fiber type and a classification theorem in the case Y has a structure of projective bundle or quadric fibration.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 22:55:20 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 20:22:38 GMT" }, { "version": "v3", "created": "Wed, 5 Mar 2008 20:57:43 GMT" } ]
"2008-03-05T00:00:00"
[ [ "Beltrametti", "Mauro C.", "" ], [ "de Fernex", "Tommaso", "" ], [ "Lanteri", "Antonio", "" ] ]
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704.0662
Frank Calegari
Frank Calegari, Matthew Emerton
Bounds for Multiplicities of Unitary Representations of Cohomological Type in Spaces of Cusp Forms
submitted
null
null
null
math.NT math.RT
null
Let $\Goo$ be a semisimple real Lie group with unitary dual $\Ghat$. The goal of this note is to produce new upper bounds for the multiplicities with which representations $\pi \in \Ghat$ of cohomological type appear in certain spaces of cusp forms on $\Goo$.
[ { "version": "v1", "created": "Wed, 4 Apr 2007 23:43:52 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Calegari", "Frank", "" ], [ "Emerton", "Matthew", "" ] ]
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704.0663
Mankei Tsang
Mankei Tsang (California Institute of Technology)
Decoherence of Quantum-Enhanced Timing Accuracy
12 pages, 4 figures, submitted
Phys. Rev. A 75, 063809 (2007)
10.1103/PhysRevA.75.063809
null
quant-ph
null
Quantum enhancement of optical pulse timing accuracy is investigated in the Heisenberg picture. Effects of optical loss, group-velocity dispersion, and Kerr nonlinearity on the position and momentum of an optical pulse are studied via Heisenberg equations of motion. Using the developed formalism, the impact of decoherence by optical loss on the use of adiabatic soliton control for beating the timing standard quantum limit [Tsang, Phys. Rev. Lett. 97, 023902 (2006)] is analyzed theoretically and numerically. The analysis shows that an appreciable enhancement can be achieved using current technology, despite an increase in timing jitter mainly due to the Gordon-Haus effect. The decoherence effect of optical loss on the transmission of quantum-enhanced timing information is also studied, in order to identify situations in which the enhancement is able to survive.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 00:18:29 GMT" } ]
"2007-06-12T00:00:00"
[ [ "Tsang", "Mankei", "", "California Institute of Technology" ] ]
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704.0664
Jaroslaw Kwapien
S. Drozdz, M. Forczek, J. Kwapien, P. Oswiecimka, R. Rak
Stock market return distributions: from past to present
to appear in Physica A
Physica A 383, 59-64 (2007)
10.1016/j.physa.2007.04.130
null
q-fin.ST physics.data-an physics.soc-ph
null
We show that recent stock market fluctuations are characterized by the cumulative distributions whose tails on short, minute time scales exhibit power scaling with the scaling index alpha > 3 and this index tends to increase quickly with decreasing sampling frequency. Our study is based on high-frequency recordings of the S&P500, DAX and WIG20 indices over the interval May 2004 - May 2006. Our findings suggest that dynamics of the contemporary market may differ from the one observed in the past. This effect indicates a constantly increasing efficiency of world markets.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 12:50:06 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Drozdz", "S.", "" ], [ "Forczek", "M.", "" ], [ "Kwapien", "J.", "" ], [ "Oswiecimka", "P.", "" ], [ "Rak", "R.", "" ] ]
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704.0665
Changxing Miao
Changxing Miao, Guixiang Xu and Lifeng Zhao
Global well-posedness and scattering for the energy-critical, defocusing Hartree equation for radial data
23 pages, 1 figure
Journal of Functional Analysis 253 (2007)605-627
10.1016/j.jfa.2007.09.008
null
math.AP math-ph math.MP
null
We consider the defocusing, $\dot{H}^1$-critical Hartree equation for the radial data in all dimensions $(n\geq 5)$. We show the global well-posedness and scattering results in the energy space. The new ingredient in this paper is that we first take advantage of the term $\displaystyle - \int_{I}\int_{|x|\leq A|I|^{1/2}}|u|^{2}\Delta \Big(\frac{1}{|x|}\Big)dxdt$ in the localized Morawetz identity to rule out the possibility of energy concentration, instead of the classical Morawetz estimate dependent of the nonlinearity.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 01:04:22 GMT" }, { "version": "v2", "created": "Sun, 15 Apr 2007 03:45:23 GMT" } ]
"2008-10-09T00:00:00"
[ [ "Miao", "Changxing", "" ], [ "Xu", "Guixiang", "" ], [ "Zhao", "Lifeng", "" ] ]
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704.0666
Bin Wang
Ahmad Sheykhi, Bin Wang and Nematollah Riazi
String inspired explanation for the super-acceleration of our universe
12 pages, 9 figures, references added
Phys.Rev.D75:123513,2007
10.1103/PhysRevD.75.123513
null
hep-th astro-ph gr-qc
null
We investigate the effect of the bulk content in the general Gauss-Bonnet braneworld on the evolution of the universe. We find that the Gauss-Bonnet term and the combination of the dark radiation and the matter content of the bulk play a crucial role in the universe evolution. We show that our model can describe the super-acceleration of our universe with the equation of state of the effective dark energy in agreement with observations.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 01:34:51 GMT" }, { "version": "v2", "created": "Fri, 18 May 2007 02:28:17 GMT" }, { "version": "v3", "created": "Tue, 22 May 2007 13:35:00 GMT" }, { "version": "v4", "created": "Tue, 10 Jul 2007 06:59:59 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Sheykhi", "Ahmad", "" ], [ "Wang", "Bin", "" ], [ "Riazi", "Nematollah", "" ] ]
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704.0667
Junhao Shen
Don Hadwin and Junhao Shen
Topological Free Entropy Dimension of in Unital C^*-algebras
Materials added
null
null
null
math.OA
null
The notion of topological free entropy dimension of $n-$tuples of elements in a unital C$^*$ algebra was introduced by Voiculescu. In the paper, we compute topological free entropy dimension of one self-adjoint element and topological orbit dimension of one self-adjoint element in a unital C$^*$ algebra. Moreover, we calculate the values of topological free entropy dimensions of families of generators of some unital C$^*$ algebras (for example: irrational rotation C$^*$ algebras or minimal tensor product of two reduced C$^*$ algebras of free groups).
[ { "version": "v1", "created": "Thu, 5 Apr 2007 01:35:53 GMT" }, { "version": "v2", "created": "Fri, 1 Jun 2007 15:52:22 GMT" }, { "version": "v3", "created": "Tue, 21 Aug 2007 15:06:48 GMT" } ]
"2007-08-21T00:00:00"
[ [ "Hadwin", "Don", "" ], [ "Shen", "Junhao", "" ] ]
[ -0.0307695735, -0.0914758593, 0.0576987341, 0.0627421662, 0.0651019365, -0.0244768485, -0.0283403955, -0.0591793731, -0.1399205774, -0.0030133359, 0.0178370979, -0.0266052689, -0.0630660579, 0.0482133739, 0.1721245348, -0.0157202445, -0.0600585043, -0.0132332295, 0.0430079959, 0.0957789719, 0.0183113664, -0.1199319288, 0.0318800546, 0.0635287538, 0.0230424777, -0.0281553157, -0.0250089541, 0.0733842775, 0.1150273085, -0.0113997795, 0.0588092133, -0.0481671058, 0.0163680241, -0.0347256623, -0.0160904042, 0.0965192914, 0.0817128792, 0.0714409351, -0.0086177941, -0.0108908089, -0.0570046827, -0.0134183103, -0.0016975319, -0.0435401015, 0.0552464202, -0.1004985124, 0.0776411146, 0.0138116051, -0.0855532959, -0.056541983, -0.0255873296, 0.0950386524, 0.025194034, -0.0610764436, -0.1188214496, 0.0086698476, -0.0418975167, 0.0170620754, -0.0007067025, -0.1296486408, -0.0128167998, -0.0929102302, -0.0131869595, 0.051544819, -0.0637601092, -0.0600585043, -0.0697289407, 0.0132910674, 0.0089995218, 0.0283866655, -0.1261321157, 0.0116600487, 0.1115107834, 0.0558016598, 0.1143795252, 0.0307001676, -0.0072990977, 0.0107924854, -0.0417818427, 0.1177109703, 0.1151198447, 0.0946222171, 0.0294971466, 0.0045575984, 0.0504343361, -0.0031203355, 0.0349107422, 0.0338696651, -0.0317643769, -0.0812039077, -0.0209718924, 0.0341241509, -0.0916609392, -0.0008212931, 0.0710244998, -0.0215387009, 0.11826621, -0.0403474681, -0.016414294, -0.0862010717, -0.0934192017, 0.0195143875, 0.0486760773, -0.0173975322, -0.0035974951, 0.0926326066, 0.0098092472, -0.0753276125, -0.0207752455, 0.0110180518, -0.073106654, -0.0474730544, -0.0303300079, 0.031463623, -0.0073685031, -0.1119734794, -0.1279829144, -0.0058965376, -0.0383347236, 0.0867563114, -0.0165184028, -0.046524521, 0.0632511377, 0.0313942172, -0.0275769401, -0.0844890848, -0.0513134673, -0.041527357, 0.0134298773, 0.0317181088, 0.1458431482, 0.0419900566, -0.0749574527, -0.0190285519, -0.0605674759, -0.0016107756, 0.0213304851, -0.0345405787, 0.0372936465, -0.0029699579, 0.0328979939, -0.029011311, 0.027738886, 0.0170389395, -0.0019043011, 0.0211454052, -0.0724588707, 0.129278481, 0.0928176865, 0.0332218856, -0.0789366812, -0.066628851, 0.0648243204, -0.0966118351, -0.0110469703, -0.1141019017, -0.0032446862, 0.0417124368, 0.0180568807, -0.0982775539, 0.095593892, 0.0244537126, -0.0512671992, 0.0257261395, 0.0573748425, -0.0247313324, -0.0692199692, -0.0419900566, 0.0077444469, -0.1175258905, 0.0443960987, -0.094344601, -0.0588092133, -0.0724588707, 0.1056807563, -0.0085657397, -0.1574106514, -0.0156392716, -0.0534881614, -0.0253791139, -0.0801859722, 0.0197804403, 0.0182188265, -0.0625108182, -0.023852203, 0.0524702184, 0.1351085007, 0.0504343361, 0.0305613577, -0.0325509682, -0.1364040673, 0.088329494, 0.0011856697, 0.140753448, 0.0050636767, -0.0158937573, 0.0143437106, 0.0976297706, 0.0156971086, -0.017547911, 0.0736618936, -0.0853219405, 0.0573748425, 0.0108156204, -0.0229383688, -0.0476118661, 0.0204397868, -0.0219435636, 0.0259343535, -0.0377332121, -0.0531642698, -0.0790292174, -0.0636675656, 0.0216428079, 0.0228805318, 0.0664437711, 0.0219204295, 0.0532568097, -0.0270679705, 0.1150273085, -0.0433318876, 0.0599196926, 0.031440489, -0.0083459578, 0.0132216625, -0.027692616, -0.0764380991, -0.0336383134, 0.0116369138, 0.0296822265, -0.0130365826, -0.0209718924, -0.1137317419, -0.0483984575, -0.1253917962, -0.0632974058, 0.056634523, -0.1107704639, 0.0160672702, 0.019005416, -0.0153385168, -0.0153963538, -0.0067612086, 0.0922624469, -0.0147601413, 0.0042250324, -0.0260037594, 0.0336614512, 0.0989253297, 0.0223368593, -0.1337203979, 0.1259470284, 0.0306538977, 0.0354659818, -0.0312785432, 0.0344249047 ]
704.0668
Xiao-Ming Xu
Xiao-Ming xu
J/psi Production in an Equilibrating Partonic System
36 pages, 24 figures
Nucl.Phys.A658:165-193,1999
10.1016/S0375-9474(99)00350-4
null
hep-ph
null
Any color singlet or octet ccbar pair is created at short distances and then expands to a full size of J/psi. Such a dynamical evolution process is included here in calculations for the J/psi number distribution as a function of transverse momentum and rapidity in central Au-Au collisions at both RHIC and LHC energies. The ccbar pairs are produced in the initial collision and in the partonic system during the prethermal and thermal stages through the partonic channels ab to ccbar [{2S+1}L_J] and ab to ccbar [{2S+1}L_J]x, and then they dissociate in the latter two stages. Dissociation of ccbar in the medium occurs via two reactions: (a) color singlet ccbar plus a gluon turns to color octet ccbar, (b) color octet ccbar plus a gluon persists as color octet. There are modest yields of ccbar in the prethermal stage at RHIC energy and through the reactions ab to ccbar [{2S+1}L_J] at LHC energy for partons with large average momentum in the prethermal stage at both collider energies and in the thermal stage at LHC energy. Production from the partonic system competes with the suppression of the initial yield in the deconfined medium. Consequently, a bulge within -1.5<y<1.5 has been found for the J/psi number distribution and the ratio of J/psi number distributions for Au-Au collisions to nucleon-nucleon collisions. This bulge is caused by the partonic system and is thus an indicator of a deconfined partonic medium. Based on this result we suggest the rapidity region worth measuring in future experiments at RHIC and LHC to be -3<y<3.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 02:21:04 GMT" } ]
"2008-11-26T00:00:00"
[ [ "xu", "Xiao-Ming", "" ] ]
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704.0669
Wojciech De Roeck
J. Derezinski and W. De Roeck
Reduced and Extended Weak Coupling Limit
39 pages, review article for the conference "Noncommutative harmonic analysis" in Bedlewo, Poland, 2006. v1-->v2, corrections in Section 5 and changes in notation
null
null
null
math-ph math.MP
null
We give an extended review of recent work on the extended weak coupling limit. Background material on completely positive semigroups and their unitary dilations is given, as well as a particularly easy construction of `quadratic noises'.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 02:21:51 GMT" }, { "version": "v2", "created": "Tue, 12 Jun 2007 05:10:12 GMT" } ]
"2007-06-12T00:00:00"
[ [ "Derezinski", "J.", "" ], [ "De Roeck", "W.", "" ] ]
[ -0.0080866627, 0.0099245403, -0.004663615, 0.0848574489, -0.0376239866, 0.1304368228, 0.003531351, 0.0644307435, -0.0893733725, 0.0281982981, 0.0097801359, -0.0345258489, -0.1372632235, 0.0914738029, 0.0610700548, 0.0362324491, 0.0127273044, 0.0780310407, 0.1063868701, 0.0832821205, -0.001132264, -0.068159014, 0.0317952856, 0.0380440727, -0.041037187, -0.0356810838, 0.0362849608, -0.0199541021, 0.0800789595, -0.1059142724, 0.0903185681, -0.030377496, -0.0771908686, 0.0019970513, -0.1247656494, 0.1013458371, 0.0037052929, 0.1063343585, -0.1017134115, 0.0647458136, -0.0280932747, -0.0566066392, -0.0638006181, -0.0031342381, 0.0018280321, 0.1340075433, 0.0330030359, 0.0228159409, 0.0368100666, -0.0075615547, -0.0193108451, 0.0256909076, 0.0768232942, -0.0613851212, -0.012602591, -0.0251132883, 0.032346651, 0.0211749785, -0.006839531, -0.1054416746, 0.0261503756, 0.0153331524, -0.0067082541, 0.0611750782, -0.096147269, -0.0394618623, -0.0664786696, -0.0013808698, 0.0162258353, 0.0713096634, -0.002000333, 0.0178405419, 0.0041975817, 0.0760356337, 0.0153856631, 0.0336331651, -0.0234854538, 0.0830195695, -0.0005119803, 0.1361079812, 0.0277782101, 0.0261372477, -0.0306663048, 0.0192845892, -0.0518019013, -0.0113620237, -0.0843848512, 0.0782410875, 0.0062783221, 0.0464983098, 0.0113817146, 0.0299048983, -0.0264785681, 0.0608075, 0.1113228872, -0.0378865376, 0.0985102504, 0.086852856, -0.0068789143, -0.0001836852, -0.0692617372, -0.0161995813, 0.0340532511, -0.0713096634, 0.1907192022, -0.0206892528, -0.0300361756, -0.0891108215, -0.0845948905, 0.1176241785, 0.0929441079, -0.0215425547, -0.0957271829, 0.0264785681, 0.0224089827, -0.0776109546, -0.0336856768, -0.0143223191, -0.1064918935, 0.0014850709, -0.081811823, -0.1058092564, 0.0713621676, 0.0361011736, 0.1189894602, -0.0702069327, -0.0333706103, -0.0899509937, -0.0609125234, -0.0580244288, 0.1119530126, -0.0051591857, -0.0106268721, 0.0428225547, -0.0526683293, 0.0001872748, 0.0348146558, 0.0067148181, 0.0879030749, -0.0717822611, 0.0389892645, 0.025848439, 0.0686841235, 0.0228947066, -0.0156350899, 0.1351627856, -0.0459732004, 0.0218051076, -0.0319265649, 0.0048113018, -0.0217394698, -0.0173548181, 0.0067279455, 0.0039350279, -0.0706795305, -0.077978529, 0.0207155086, 0.0780310407, 0.0455268584, -0.1020284742, 0.1260259151, 0.0276469346, -0.0283033196, 0.0343158059, 0.0807090923, -0.0114342254, 0.025625268, 0.0445028991, -0.0697868466, -0.0800789595, 0.0280932747, -0.0561340414, -0.0872204304, 0.0526420735, 0.0875354931, 0.0516706221, -0.1256058216, -0.1671943665, -0.1265510172, -0.0039580013, 0.1382084191, 0.0565016158, -0.0388842449, 0.0039218999, -0.0839122534, -0.041903615, 0.0062914495, 0.0328717567, -0.0029356817, -0.0427175313, -0.0708370656, 0.0680539906, -0.0010173967, 0.1041289046, 0.0656384975, -0.147975415, -0.0228421967, 0.0733050704, 0.0060781245, -0.0116902161, 0.0090515483, -0.0152675137, 0.0948870108, 0.0326354578, -0.0072399261, -0.0121825049, 0.0734626055, 0.0498852544, -0.0344995931, -0.0061306353, 0.0102592967, -0.0185363106, 0.0682115257, 0.0492026135, 0.0593371987, -0.0486249961, -0.0119593339, 0.0434526838, 0.0810766667, 0.051906921, -0.0514868349, -0.0070955213, 0.0813917294, 0.0370988771, 0.051250536, 0.0206498709, -0.0013004626, 0.0157007277, 0.0726749375, -0.0140728932, 0.0388317332, -0.0989303365, -0.0719923005, -0.0791862831, 0.0137184449, -0.0294323005, -0.0287759155, -0.0251132883, -0.0348146558, -0.1276012361, -0.0771383569, -0.0209649354, 0.0083885994, 0.0635380596, -0.0153462803, 0.0567641705, -0.0741452426, 0.0389892645, -0.0281457864, -0.1180442646, -0.0220545344, 0.0524057746, 0.077558443, 0.0548737794, -0.0564491041, 0.0113423318 ]
704.067
Masanori Dozono
M. Dozono, T. Wakasa, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, Y. Yamada
Complete Set of Polarization Transfer Observables for the $^{12}{\rm C}(p,n)$ Reaction at 296 MeV and 0$^{\circ}$
4 pages, 4 figures
J.Phys.Soc.Jap.77:014201,2008
10.1143/JPSJ.77.014201
null
nucl-ex
null
A complete set of polarization transfer observables has been measured for the $^{12}{\rm C}(p,n)$ reaction at $T_p=296 {\rm MeV}$ and $\theta_{\rm lab}=0^{\circ}$. The total spin transfer $\Sigma(0^{\circ})$ and the observable $f_1$ deduced from the measured polarization transfer observables indicate that the spin--dipole resonance at $E_x \simeq 7 {\rm MeV}$ has greater $2^-$ strength than $1^-$ strength, which is consistent with recent experimental and theoretical studies. The results also indicate a predominance of the spin-flip and unnatural-parity transition strength in the continuum. The exchange tensor interaction at a large momentum transfer of $Q \simeq 3.6 {\rm fm}^{-1}$ is discussed.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 02:35:07 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Dozono", "M.", "" ], [ "Wakasa", "T.", "" ], [ "Ihara", "E.", "" ], [ "Asaji", "S.", "" ], [ "Fujita", "K.", "" ], [ "Hatanaka", "K.", "" ], [ "Ishida", "T.", "" ], [ "Kaneda", "T.", "" ], [ "Matsubara", "H.", "" ], [ "Nagasue", "Y.", "" ], [ "Noro", "T.", "" ], [ "Sakemi", "Y.", "" ], [ "Shimizu", "Y.", "" ], [ "Takeda", "H.", "" ], [ "Tameshige", "Y.", "" ], [ "Tamii", "A.", "" ], [ "Yamada", "Y.", "" ] ]
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704.0671
Maxim Raginsky
Maxim Raginsky
Learning from compressed observations
6 pages; submitted to the 2007 IEEE Information Theory Workshop (ITW 2007)
null
10.1109/ITW.2007.4313111
null
cs.IT cs.LG math.IT
null
The problem of statistical learning is to construct a predictor of a random variable $Y$ as a function of a related random variable $X$ on the basis of an i.i.d. training sample from the joint distribution of $(X,Y)$. Allowable predictors are drawn from some specified class, and the goal is to approach asymptotically the performance (expected loss) of the best predictor in the class. We consider the setting in which one has perfect observation of the $X$-part of the sample, while the $Y$-part has to be communicated at some finite bit rate. The encoding of the $Y$-values is allowed to depend on the $X$-values. Under suitable regularity conditions on the admissible predictors, the underlying family of probability distributions and the loss function, we give an information-theoretic characterization of achievable predictor performance in terms of conditional distortion-rate functions. The ideas are illustrated on the example of nonparametric regression in Gaussian noise.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 02:57:15 GMT" } ]
"2016-11-15T00:00:00"
[ [ "Raginsky", "Maxim", "" ] ]
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704.0672
Jie Ren
Jie Ren, Xin-He Meng, Liu Zhao
Hamiltonian formalism in Friedmann cosmology and its quantization
7 pages, no figure; v2: matches the version accepted by PRD
Phys.Rev.D76:043521,2007
10.1103/PhysRevD.76.043521
null
hep-th
null
We propose a Hamiltonian formalism for a generalized Friedmann-Roberson-Walker cosmology model in the presence of both a variable equation of state (EOS) parameter $w(a)$ and a variable cosmological constant $\Lambda(a)$, where $a$ is the scale factor. This Hamiltonian system containing 1 degree of freedom and without constraint, gives Friedmann equations as the equation of motion, which describes a mechanical system with a variable mass object moving in a potential field. After an appropriate transformation of the scale factor, this system can be further simplified to an object with constant mass moving in an effective potential field. In this framework, the $\Lambda$ cold dark matter model as the current standard model of cosmology corresponds to a harmonic oscillator. We further generalize this formalism to take into account the bulk viscosity and other cases. The Hamiltonian can be quantized straightforwardly, but this is different from the approach of the Wheeler-DeWitt equation in quantum cosmology.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:20:03 GMT" }, { "version": "v2", "created": "Fri, 29 Jun 2007 08:30:31 GMT" }, { "version": "v3", "created": "Sat, 1 Sep 2007 12:50:39 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Ren", "Jie", "" ], [ "Meng", "Xin-He", "" ], [ "Zhao", "Liu", "" ] ]
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704.0673
Mark McDonnell
Mark D. McDonnell, Nigel G. Stocks and Derek Abbott
Optimal stimulus and noise distributions for information transmission via suprathreshold stochastic resonance
Accepted for publication by Physical Review E, 28 pages of text and references, 5 figures, 2 tables
Phys. Rev. E 75, 061105 (2007)
10.1103/PhysRevE.75.061105
null
cond-mat.stat-mech q-bio.NC
null
Suprathreshold stochastic resonance (SSR) is a form of noise enhanced signal transmission that occurs in a parallel array of independently noisy identical threshold nonlinearities, including model neurons. Unlike most forms of stochastic resonance, the output response to suprathreshold random input signals of arbitrary magnitude is improved by the presence of even small amounts of noise. In this paper the information transmission performance of SSR in the limit of a large array size is considered. Using a relationship between Shannon's mutual information and Fisher information, a sufficient condition for optimality, i.e. channel capacity, is derived. It is shown that capacity is achieved when the signal distribution is Jeffrey's prior, as formed from the noise distribution, or when the noise distribution depends on the signal distribution via a cosine relationship. These results provide theoretical verification and justification for previous work in both computational neuroscience and electronics.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 04:05:47 GMT" } ]
"2007-07-02T00:00:00"
[ [ "McDonnell", "Mark D.", "" ], [ "Stocks", "Nigel G.", "" ], [ "Abbott", "Derek", "" ] ]
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704.0674
A. Faltenbacher
A. Faltenbacher, Cheng Li, Shude Mao, Frank C. van den Bosch, Xiaohu Yang, Y.P. Jing, Anna Pasquali, H.J. Mo
Three Different Types of Galaxy Alignment within Dark Matter Halos
4 pages, 4 figures, ApJL accepted
null
10.1086/519683
null
astro-ph
null
Using a large galaxy group catalogue based on the Sloan Digital Sky Survey Data Release 4 we measure three different types of intrinsic galaxy alignment within groups: halo alignment between the orientation of the brightest group galaxies (BGG) and the distribution of its satellite galaxies, radial alignment between the orientation of a satellite galaxy and the direction towards its BGG, and direct alignment between the orientation of the BGG and that of its satellites. In agreement with previous studies we find that satellite galaxies are preferentially located along the major axis. In addition, on scales r < 0.7 Rvir we find that red satellites are preferentially aligned radially with the direction to the BGG. The orientations of blue satellites, however, are perfectly consistent with being isotropic. Finally, on scales r < 0.1 \Rvir, we find a weak but significant indication for direct alignment between satellites and BGGs. We briefly discuss the implications for weak lensing measurements.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 03:58:28 GMT" }, { "version": "v2", "created": "Fri, 8 Jun 2007 10:27:04 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Faltenbacher", "A.", "" ], [ "Li", "Cheng", "" ], [ "Mao", "Shude", "" ], [ "Bosch", "Frank C. van den", "" ], [ "Yang", "Xiaohu", "" ], [ "Jing", "Y. P.", "" ], [ "Pasquali", "Anna", "" ], [ "Mo", "H. J.", "" ] ]
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704.0675
Brian Metzger
B.D. Metzger, T.A. Thompson, E. Quataert
Proto-Neutron Star Winds, Magnetar Birth, and Gamma-Ray Bursts
5 pages; to appear in the AIP conference proceedings of "Supernova 1987A: 20 Years After - Supernovae and Gamma-Ray Bursters", February 19-23, 2007, Aspen, Colorado
AIP Conf.Proc.937:521-525,2007
10.1063/1.2803618
null
astro-ph
null
We begin by reviewing the theory of thermal, neutrino-driven proto-neutron star (PNS) winds. Including the effects of magnetic fields and rotation, we then derive the mass and energy loss from magnetically-driven PNS winds for both relativistic and non-relativistic outflows, including important multi-dimensional considerations. With these simple analytic scalings we argue that proto-magnetars born with ~ millisecond rotation periods produce relativistic winds just a few seconds after core collapse with luminosities, timescales, mass-loading, and internal shock efficiencies favorable for producing long-duration gamma-ray bursts.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 04:22:20 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Metzger", "B. D.", "" ], [ "Thompson", "T. A.", "" ], [ "Quataert", "E.", "" ] ]
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704.0676
Fernando Comeron
F. Comeron and A. Pasquali
A very massive runaway star from Cygnus OB2
Accepted by Astronomy and Astrophysics (letters); 5 pages, 3 figures
null
10.1051/0004-6361:20077304
null
astro-ph
null
Aims: We analyze the available information on the star BD+43 3654 to investigate the possibility that it may have had its origin in the massive OB association Cygnus OB2. Methods: We present new spectroscopic observations allowing a reliable spectral classification of the star, and discuss existing MSX observations of its associated bow shock and astrometric information not previously studied. Results: Our observations reveal that BD+43 3654 is a very early and luminous star of spectral type O4If, with an estimated mass of (70 +/- 15) solar masses and an age of about 1.6 Myr. The high spatial resolution of the MSX observations allows us to determine its direction of motion in the plane of the sky by means of the symmetry axis of the well-defined bow shock, which matches well the orientation expected from the proper motion. Tracing back its path across the sky we find that BD+43 3654 was located near the central, densest region of Cygnus OB2 at a time in the past similar to its estimated age. Conclusions: BD+43 3654 turns out to be one of the three most massive runaway stars known, and it most likely formed in the central region of Cygnus OB2. A runaway formation mechanism by means of dynamical ejection is consistent with our results.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 04:48:39 GMT" } ]
"2015-05-13T00:00:00"
[ [ "Comeron", "F.", "" ], [ "Pasquali", "A.", "" ] ]
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704.0677
Valentina Klochkova
V.G.Klochkova, E.L.Chentsov, N.S.Tavolganskaya, M.V.Shapovalov
Optical spectrum of the post-AGB star HD56126 in the region 4010-8790 AA
42 pages, 6 figures
Astrophys.Bull.62:162-192,2007
10.1134/S199034130702006X
null
astro-ph
null
We studied in detail the optical spectrum of the post-AGB star HD56126 (IRAS07134+1005). We use high resolution spectra (R=25000 and 60000) obtained with the echelle spectrographs of the 6-m telescope. About one and a half thousand absorptions of neutral atoms and ions, absorption bands of C_2, CN, and CH molecules, and interstellar bands (DIBs) are identified in the 4010 to 8790 AA wavelength region, and the depths and radial velocities of these spectral features are measured. Differences are revealed between the variations of the radial velocities measured from spectral features of different excitation. In addition to the well-known variability of the Halpha profile, we found variations in the profiles of a number of FeII, YII, and BaII lines. We also produce an atlas of the spectrum of HD56126 and its comparison staralpha Per. The full version of the atlas is available in electronic form from Web-address: http://www.sao.ru/hq/ssl/Atlas/Atlas.html
[ { "version": "v1", "created": "Thu, 5 Apr 2007 04:50:38 GMT" } ]
"2011-08-04T00:00:00"
[ [ "Klochkova", "V. G.", "" ], [ "Chentsov", "E. L.", "" ], [ "Tavolganskaya", "N. S.", "" ], [ "Shapovalov", "M. V.", "" ] ]
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704.0678
Hugo Cable
Hugo Cable and Jonathan P. Dowling
Generation of Large Number-Path Entanglement Using Linear Optics and Feed-Forward
null
Phys. Rev. Lett. 99, 163604 (2007)
10.1103/PhysRevLett.99.163604
null
quant-ph
null
We show how an idealised measurement procedure can condense photons from two modes into one, and how, by feeding forward the results of the measurement, it is possible to generate efficiently superpositions of components for which only one mode is populated, commonly called ``N00N states''. For the basic procedure, sources of number states leak onto a beam splitter, and the output ports are monitored by photodetectors. We find that detecting a fixed fraction of the input at one output port suffices to direct the remainder to the same port with high probability, however large the initial state. When instead photons are detected at both ports, Schr\"{o}dinger cat states are produced. We describe a circuit for making the components of such a state orthogonal, and another for subsequent conversion to a N00N state. Our approach scales exponentially better than existing proposals. Important applications include quantum imaging and metrology.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 04:53:26 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Cable", "Hugo", "" ], [ "Dowling", "Jonathan P.", "" ] ]
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704.0679
Katsunori Iwasaki
Katsunori Iwasaki
Finite branch solutions to Painleve VI around a fixed singular point
45 pages, 22 figures, 5 tables
null
null
null
math.AG math.CA
null
Every finite branch solutions to the sixth Painleve equation around a fixed singular point is an algebraic branch solution. In particular a global solution is an algebraic solution if and only if it is finitely many-valued globally. The proof of this result relies on algebraic geometry of Painleve VI, Riemann-Hilbert correspondence, geometry and dynamics on cubic surfaces, resolutions of Kleinian singularities, and power geometry of algebraic differential equations. In the course of the proof we are also able to classify all finite branch solutions up to Backlund transformations.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 05:57:44 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Iwasaki", "Katsunori", "" ] ]
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704.068
Sohrab Rahvar
Sohrab Rahvar, Yousef Sobouti
An Inverse $f(R)$ Gravitation for Cosmic Speed up, and Dark Energy Equivalent
10 pages, 6 figures, accepted in Mod. Phys. Lett. A
Mod.Phys.Lett.A23:1929-1937,2008
10.1142/S0217732308026042
null
astro-ph gr-qc hep-th
null
To explain the cosmic speed up, brought to light by the recent SNIa and CMB observations, we propose the following: a) In a spacetime endowed with a FRW metric, we choose an empirical scale factor that best explains the observations. b) We assume a modified gravity, generated by an unspecified field lagrangian, $f(R)$. c) We use the adopted empirical scale factor to work back retroactively to obtain $f(R)$, hence the term `Inverse $f(R)$'. d) Next we consider the classic GR and a conventional FRW universe that, in addition to its known baryonic content, possesses a hypothetical `Dark Energy' component. We compare the two scenarios, and find the density, the pressure, and the equation of the state of the Dark Energy required to make up for the differences between the conventional and the modified GR models.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 06:13:19 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 08:49:44 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Rahvar", "Sohrab", "" ], [ "Sobouti", "Yousef", "" ] ]
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704.0681
Pavel Zakharov
P. Zakharov and F. Scheffold
Monitoring spatially heterogeneous dynamics in a drying colloidal thin film
To appear in Soft Materials
Soft Materials, 8(2):102-113, (2010)
10.1080/15394451003708549
null
cond-mat.soft cond-mat.stat-mech physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a new type of experiment that enables us to monitor spatially and temporally heterogeneous dynamic properties in complex fluids. Our approach is based on the analysis of near-field speckles produced by light diffusely reflected from the superficial volume of a strongly scattering medium. By periodic modulation of an incident speckle beam we obtain pixel-wise ensemble averages of the structure function coefficient, a measure of the dynamic activity. To illustrate the application of our approach we follow the different stages in the drying process of a colloidal thin film. We show that we can access ensemble averaged dynamic properties on length scales as small as ten micrometers over the full field of view.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 06:55:23 GMT" }, { "version": "v2", "created": "Tue, 18 May 2010 13:42:48 GMT" } ]
"2012-08-10T00:00:00"
[ [ "Zakharov", "P.", "" ], [ "Scheffold", "F.", "" ] ]
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704.0682
Rebeca Soria-Ruiz
R.Soria-Ruiz (1), J.Alcolea (2), F.Colomer (2), V.Bujarrabal (2) and J.-F.Desmurs (2) ((1) Joint Institute for VLBI in Europe-The Netherlands, (2) Observatorio Astronomico Nacional-Spain)
Mapping the circumstellar SiO maser emission in R Leo
accepted for publication in A&A
null
10.1051/0004-6361:20077554
null
astro-ph
null
The study of the innermost circumstellar layers around AGB stars is crucial to understand how these envelopes are formed and evolve. The SiO maser emission occurs at a few stellar radii from the central star, providing direct information on the stellar pulsation and on the chemical and physical properties of these regions. Our data also shed light on several aspects of the SiO maser pumping theory that are not well understood yet. We aim to determine} the relative spatial distribution of the 43 GHz and 86 GHz SiO maser lines in the oxygen-rich evolved star R Leo. We have imaged with milliarcsecond resolution, by means of Very Long Baseline Interferometry, the 43 GHz (28SiO v=1, 2 J=1-0 and 29SiO v=0 J=1-0) and 86 GHz (28SiO v=1 J=2-1 and 29SiO v=0 J=2-1) masing regions. We confirm previous results obtained in other oxygen-rich envelopes. In particular, when comparing the 43 GHz emitting regions, the 28SiO v=2 transition is produced in an inner layer, closer to the central star. On the other hand, the 86 GHz line arises in a clearly farther shell. We have also mapped for the first time the 29SiO v=0 J=1-0 emission in R Leo. The already reported discrepancy between the observed distributions of the different maser lines and the theoretical predictions is also found in R Leo.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 07:48:21 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Soria-Ruiz", "R.", "" ], [ "Alcolea", "J.", "" ], [ "Colomer", "F.", "" ], [ "Bujarrabal", "V.", "" ], [ "Desmurs", "J. -F.", "" ] ]
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704.0683
Sergey Maleyev V.
S.V. Maleyev S.V. Grigoriev
Partially disordered state near ferromagnetic transition in MnSi
5 pages, 3 figures
null
null
null
cond-mat.str-el
null
The polarized neutron scattering in helimagnetic MnSi at low $T$ reveals existence of a partially disordered chiral state at ambient pressure in the magnetic field applied along $<111>$ axis below the first order transition to the non-chiral ferromagnetic state. This unexpected phenomenon is explained by the analysis of the spin-wave spectrum. We demonstrate that the square of the spin-wave gap becomes negative under magnetic field applied along $<111>$ and $<110>$ but not along the $<100>$ direction. It is a result of competition between the spin-wave interaction and cubic anisotropy. This negative sign means an instability of the spin wave spectrum for the helix and leads to a destruction of the helical order, giving rise to the partially disordered state below the first order ferromagnetic transition.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 07:35:11 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Grigoriev", "S. V. Maleyev S. V.", "" ] ]
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704.0684
Leticia Cugliandolo
Claudio Chamon and Leticia F. Cugliandolo
Fluctuations in glassy systems
33 pages, 7 figs, contribution to JSTAT special issue `Principles of Dynamical Systems' work-shop at Newton Institute, Univ. of Cambridge, UK
J. Stat. Mech. (2007) P07022
10.1088/1742-5468/2007/07/P07022
null
cond-mat.dis-nn cond-mat.stat-mech
null
We summarize a theoretical framework based on global time-reparametrization invariance that explains the origin of dynamic fluctuations in glassy systems. We introduce the main ideas without getting into much technical details. We describe a number of consequences arising from this scenario that can be tested numerically and experimentally distinguishing those that can also be explained by other mechanisms from the ones that we believe, are special to our proposal. We support our claims by presenting some numerical checks performed on the 3d Edwards-Anderson spin-glass. Finally, we discuss up to which extent these ideas apply to super-cooled liquids that have been studied in much more detail up to present.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 07:38:32 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Chamon", "Claudio", "" ], [ "Cugliandolo", "Leticia F.", "" ] ]
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704.0685
Masaya Tomie
Masaya Tomie
A generalization of Chebyshev polynomials and non rooted posets
11pages
null
null
null
math.CO
null
In this paper we give a generalization of Chebyshev polynomials and using this we describe the M\"obius function of the generalized subword order from a poset {a1,...as,c |ai<c}, which contains an affirmative answer for the conjecture by Bj\"orner, Sagan, Vatter.[5,10]
[ { "version": "v1", "created": "Thu, 5 Apr 2007 07:40:15 GMT" }, { "version": "v2", "created": "Sun, 8 Apr 2007 04:33:18 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Tomie", "Masaya", "" ] ]
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704.0686
Ioannis Antoniou
Antoniou Ioannis, Tsompa Eleni
Statistical analysis of weighted networks
20 pages, 6 figures
null
null
null
physics.soc-ph
null
The purpose of this paper is to assess the statistical characterization of weighted networks in terms of the generalization of the relevant parameters, namely average path length, degree distribution and clustering coefficient. Although the degree distribution and the average path length admit straightforward generalizations, for the clustering coefficient several different definitions have been proposed in the literature. We examined the different definitions and identified the similarities and differences between them. In order to elucidate the significance of different definitions of the weighted clustering coefficient, we studied their dependence on the weights of the connections. For this purpose, we introduce the relative perturbation norm of the weights as an index to assess the weight distribution. This study revealed new interesting statistical regularities in terms of the relative perturbation norm useful for the statistical characterization of weighted graphs.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 07:58:56 GMT" }, { "version": "v2", "created": "Wed, 16 May 2007 07:55:00 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Ioannis", "Antoniou", "" ], [ "Eleni", "Tsompa", "" ] ]
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704.0687
Piotr Szopa
Piotr Szopa
Finite dimensionality of 2-D micropolar fluid flow with periodic boundary conditions
25 pages, 0 figures
null
null
null
math.AP math-ph math.MP
null
This paper is devoted to describe the finite-dimensionality of a two-dimensional micropolar fluid flow with periodic boundary conditions. We define the notions of determining modes and nodes and estimate the number of them, we also estimate the dimension of the global attractor. Finally we compare our results with analogous results for Navier-Stokes equation.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:13:52 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Szopa", "Piotr", "" ] ]
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704.0688
Lionel Levine
Lionel Levine and Yuval Peres
Strong Spherical Asymptotics for Rotor-Router Aggregation and the Divisible Sandpile
[v3] Added Theorem 4.1, which generalizes Theorem 1.4 for the abelian sandpile. [v4] Added references and improved exposition in sections 2 and 4. [v5] Final version, to appear in Potential Analysis
Potential Analysis 30, no. 1 (Jan. 2009), 1--27. See arXiv:0901.3805 for a correction to the proof of the outer bound of Theorem 4.1.
10.1007/s11118-008-9104-6
null
math.PR cond-mat.stat-mech math-ph math.CO math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rotor-router model is a deterministic analogue of random walk. It can be used to define a deterministic growth model analogous to internal DLA. We prove that the asymptotic shape of this model is a Euclidean ball, in a sense which is stronger than our earlier work. For the shape consisting of $n=\omega_d r^d$ sites, where $\omega_d$ is the volume of the unit ball in $\R^d$, we show that the inradius of the set of occupied sites is at least $r-O(\log r)$, while the outradius is at most $r+O(r^\alpha)$ for any $\alpha > 1-1/d$. For a related model, the divisible sandpile, we show that the domain of occupied sites is a Euclidean ball with error in the radius a constant independent of the total mass. For the classical abelian sandpile model in two dimensions, with $n=\pi r^2$ particles, we show that the inradius is at least $r/\sqrt{3}$, and the outradius is at most $(r+o(r))/\sqrt{2}$. This improves on bounds of Le Borgne and Rossin. Similar bounds apply in higher dimensions.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:09:21 GMT" }, { "version": "v2", "created": "Fri, 11 May 2007 00:03:18 GMT" }, { "version": "v3", "created": "Thu, 27 Sep 2007 23:24:01 GMT" }, { "version": "v4", "created": "Wed, 28 Nov 2007 23:41:46 GMT" }, { "version": "v5", "created": "Tue, 14 Oct 2008 19:43:07 GMT" } ]
"2009-12-05T00:00:00"
[ [ "Levine", "Lionel", "" ], [ "Peres", "Yuval", "" ] ]
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704.0689
Hongxing Yin
H. X. Yin and Y. H. Zhao
Study on Correlations between the Twin Kilohertz Quasi-periodic Oscillations in Low-mass X-ray Binaries
14 pages, 3 figures, accepted by Advances of Space Research
Adv.Space Res.40:1522-1527,2007
10.1016/j.asr.2007.04.017
null
astro-ph
null
The recently updated data of the twin kilohertz quasi-periodic oscillations (kHz QPOs) in the neutron star low-mass X-ray binaries are analyzed. The power-law fitting $\nu_{1}=a(\nu_{2}/1000)^{b}$ and linear fitting $\nu_{2}=A\nu_{1}+B$ are applied, individually, to the data points of four Z sources (GX 17+2, GX 340+0, GX 5-1 and Sco X-1) and four Atoll sources (4U 0614+09, 4U 1608-52, 4U 1636-53 and 4U 1728-34). The $\chi^{2}$-tests show that the power-law correlation and linear correlation both can fit data well. Moreover, the comparisons between the data and the theoretical models for kHz QPOs are discussed.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:15:00 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Yin", "H. X.", "" ], [ "Zhao", "Y. H.", "" ] ]
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704.069
Marika Taylor
Ingmar Kanitscheider, Kostas Skenderis and Marika Taylor
Fuzzballs with internal excitations
65 pages, 45 + appendices
JHEP 0706:056,2007
10.1088/1126-6708/2007/06/056
null
hep-th
null
We construct general 2-charge D1-D5 horizon-free non-singular solutions of IIB supergravity on T^4 and K3 describing fuzzballs with excitations in the internal manifold; these excitations are characterized by arbitrary curves. The solutions are obtained via dualities from F1-P solutions of heterotic and type IIB on T^4 for the K3 and T^4 cases, respectively. We compute the holographic data encoded in these solutions, and show that the internal excitations are captured by vevs of chiral primaries associated with the middle cohomology of T^4 or K3. We argue that each geometry is dual to a specific superposition of R ground states determined in terms of the Fourier coefficients of the curves defining the supergravity solution. We compute vevs of chiral primaries associated with the middle cohomology and show that they indeed acquire vevs in the superpositions corresponding to fuzzballs with internal excitations, in accordance with the holographic results. We also address the question of whether the fuzzball program can be implemented consistently within supergravity.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 15:10:37 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Kanitscheider", "Ingmar", "" ], [ "Skenderis", "Kostas", "" ], [ "Taylor", "Marika", "" ] ]
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704.0691
Dietrich Stauffer
C. Schulze, D. Stauffer, S. Wichmann
Birth, survival and death of languages by Monte Carlo simulation
24 pages review, draft for Comm.Comput.Phys., plus appendix on bilinguality
null
null
null
physics.soc-ph
null
Simulations of physicists for the competition between adult languages since 2003 are reviewed. How many languages are spoken by how many people? How many languages are contained in various language families? How do language similarities decay with geographical distance, and what effects do natural boundaries have? New simulations of bilinguality are given in an appendix.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:27:38 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Schulze", "C.", "" ], [ "Stauffer", "D.", "" ], [ "Wichmann", "S.", "" ] ]
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704.0692
Gheorghe Adam
Gh. Adam and S. Adam (LIT-JINR, Dubna, Russia and IFIN-HH, Magurele-Bucharest, Romania)
Rigorous derivation of the mean field Green functions of the two-band Hubbard model of superconductivity
16 pages, Submitted to J. Phys. A: Mathematical and Theoretical
null
10.1088/1751-8113/40/37/001
null
cond-mat.supr-con cond-mat.str-el
null
The Green function (GF) equation of motion technique for solving the effective two-band Hubbard model of high-T_c superconductivity in cuprates [N.M. Plakida et al., Phys. Rev. B, v. 51, 16599 (1995); JETP, v. 97, 331 (2003)] rests on the Hubbard operator (HO) algebra. We show that, if we take into account the invariance to translations and spin reversal, the HO algebra results in invariance properties of several specific correlation functions. The use of these properties allows rigorous derivation and simplification of the expressions of the frequency matrix (FM) and of the generalized mean field approximation (GMFA) Green functions (GFs) of the model. For the normal singlet hopping and anomalous exchange pairing correlation functions which enter the FM and GMFA-GFs, an approximation procedure based on the identification and elimination of exponentially small quantities is described. It secures the reduction of the correlation order to GMFA-GF expressions.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:44:06 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Adam", "Gh.", "", "LIT-JINR, Dubna, Russia and IFIN-HH,\n Magurele-Bucharest, Romania" ], [ "Adam", "S.", "", "LIT-JINR, Dubna, Russia and IFIN-HH,\n Magurele-Bucharest, Romania" ] ]
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704.0693
Cosima Schuster
Udo Schwingenschloegl and Cosima Schuster
Geometry Effects at Atomic-Size Aluminium Contacts
10 pages, 4 figures, accepted by Chem. Phys. Lett
Chem. Phys. Lett. 439, 143 (2007)
10.1016/j.cplett.2007.03.093
null
cond-mat.mes-hall
null
We present electronic structure calculations for aluminium nanocontacts. Addressing the neck of the contact, we compare characteristic geometries to investigate the effects of the local aluminium coordination on the electronic states. We find that the Al 3pz states are very sensitive against modifications of the orbital overlap, which has serious consequences for the transport properties. Stretching of the contact shifts states towards the Fermi energy, leaving the system instable against ferromagnetic ordering. By spacial restriction, hybridization is locally suppressed at nanocontacts and the charge neutrality is violated. We discuss the influence of mechanical stress by means of quantitative results for the charge transfer.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:52:09 GMT" } ]
"2015-05-13T00:00:00"
[ [ "Schwingenschloegl", "Udo", "" ], [ "Schuster", "Cosima", "" ] ]
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704.0694
Denis Gokhfeld
D M Gokhfeld, D A Balaev, K A Shaykhutdinov, S I Popkov, M I Petrov
Current - voltage characteristics of break junctions of high-$T_c$ superconductors
9 pages, 5 figures, 2 Tables
Physica C, V. 467, Issues 1-2, (2007), P. 80-84
10.1016/j.physc.2007.09.001
null
cond-mat.supr-con cond-mat.dis-nn
null
The current-voltage ($I$-$V$) characteristics of break junctions of polycrystalline La$_{1.85}$Sr$_{0.15}$CuO$_4$, Y$_{0.75}$Lu$_{0.25}$Ba$_2$Cu$_3$O$_{7-\delta}$, Bi$_{1.8}$Pb$_{0.3}$Sr$_{1.9}$Ca$_2$Cu$_3$O$_x$ and composite YBa$_2$Cu$_3$O$_{7-\delta}$ + Ag are investigated. The experimental $I$-$V$ curves exhibit the specific peculiarities of superconductor/normal-metal/superconductor junctions. The relation between an $I$-$V$ characteristic of network of weak links and $I$-$V$ dependencies of typical weak links is suggested to describe the experimental data. The $I$-$V$ curves of typical weak links are calculated by the K\"{u}mmel - Gunsenheimer - Nicolsky model considering the multiple Andreev reflections.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 08:57:57 GMT" } ]
"2007-11-22T00:00:00"
[ [ "Gokhfeld", "D M", "" ], [ "Balaev", "D A", "" ], [ "Shaykhutdinov", "K A", "" ], [ "Popkov", "S I", "" ], [ "Petrov", "M I", "" ] ]
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704.0695
Antonino Di Piazza
A. Di Piazza, A. I. Milstein and C. H. Keitel
Photon splitting in a laser field
31 pages, 4 figures
Phys. Rev. A vol. 76, 032103 (2007)
10.1103/PhysRevA.76.032103
null
hep-ph physics.atom-ph
null
Photon splitting due to vacuum polarization in a laser field is considered. Using an operator technique, we derive the amplitudes for arbitrary strength, spectral content and polarization of the laser field. The case of a monochromatic circularly polarized laser field is studied in detail and the amplitudes are obtained as three-fold integrals. The asymptotic behavior of the amplitudes for various limits of interest are investigated also in the case of a linearly polarized laser field. Using the obtained results, the possibility of experimental observation of the process is discussed.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:41:50 GMT" }, { "version": "v2", "created": "Sat, 8 Sep 2007 11:13:49 GMT" } ]
"2007-09-08T00:00:00"
[ [ "Di Piazza", "A.", "" ], [ "Milstein", "A. I.", "" ], [ "Keitel", "C. H.", "" ] ]
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704.0696
Paritosh Modak Dr
Ashok K. Verma and P. Modak
Phonon instability and structural phase transition in Vanadium under high pressure
16 pages, 4 figures
null
10.1209/0295-5075/81/37003
null
cond-mat.mtrl-sci
null
Results of the first-principles calculations are presented for the group-VB metals V, Nb and Ta up to couple of megabar pressure. An unique structural phase transition sequence BCC-->(at 60 GPa) rhombohedral (angle=110.5 degree)-->(at ~ 160 GPa)rhombohedral(angle=108.5 degree)--> (at ~ 430 GPa) BCC is predicted in V. We also find that BCC-V becomes mechanically and vibrationally unstable at around 112 GPa pressure. Similar transitions are absent in Nb and Ta.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:29:02 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Verma", "Ashok K.", "" ], [ "Modak", "P.", "" ] ]
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704.0697
Tetsuo Shindou
Shinya Kanemura, Koichi Matsuda, Toshihiko Ota, Serguey Petcov, Tetsuo Shindou, Eiichi Takasugi and Koji Tsumura
CP violation due to multi Froggatt-Nielsen fields
8 pages, no figure
Eur.Phys.J.C51:927-931,2007
10.1140/epjc/s10052-007-0343-2
null
hep-ph
null
We study how to incorporate CP violation in the Froggatt--Nielsen (FN) mechanism. To this end, we introduce non-renormalizable interactions with a flavor democratic structure to the fermion mass generation sector. It is found that at least two iso-singlet scalar fields with imposed a discrete symmetry are necessary to generate CP violation due to the appearance of the relative phase between their vacuum expectation values. In the simplest model, ratios of quark masses and the Cabibbo-Kobayashi-Maskawa (CKM) matrix including the CP violating phase are determined by the CKM element |V_{us}| and the ratio of two vacuum expectation values R=|R|e^{i*alpha} (a magnitude and a phase). It is demonstrated how the angles phi_i (i=1--3) of the unitarity triangle and the CKM off-diagonal elements |V_{ub}| and |V_{cb}| are predicted as a function of |V_{us}|, |R| and \alpha. Although the predicted value of the CP violating phase does not agree with the experimental data within the simplest model, the basic idea of our scenario would be promising to construct a more realistic model of flavor and CP violation.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:55:52 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Kanemura", "Shinya", "" ], [ "Matsuda", "Koichi", "" ], [ "Ota", "Toshihiko", "" ], [ "Petcov", "Serguey", "" ], [ "Shindou", "Tetsuo", "" ], [ "Takasugi", "Eiichi", "" ], [ "Tsumura", "Koji", "" ] ]
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704.0698
Paul Wright
Paul Wright
Rigorous Results for the Periodic Oscillation of an Adiabatic Piston
Ph.D. dissertation,
null
null
null
math.DS math-ph math.MP
null
We study a heavy piston of mass $M$ that moves in one dimension. The piston separates two gas chambers, each of which contains finitely many ideal, unit mass gas particles moving in $d$ dimensions, where $ d\geq 1$. Using averaging techniques, we prove that the actual motions of the piston converge in probability to the predicted averaged behavior on the time scale $M^ {1/2} $ when $M$ tends to infinity while the total energy of the system is bounded and the number of gas particles is fixed. Neishtadt and Sinai previously pointed out that an averaging theorem due to Anosov should extend to this situation. When $ d=1$, the gas particles move in just one dimension, and we prove that the rate of convergence of the actual motions of the piston to its averaged behavior is $\mathcal{O} (M^ {-1/2}) $ on the time scale $M^ {1/2} $. The convergence is uniform over all initial conditions in a compact set. We also investigate the piston system when the particle interactions have been smoothed. The convergence to the averaged behavior again takes place uniformly, both over initial conditions and over the amount of smoothing. In addition, we prove generalizations of our results to $N$ pistons separating $N+1$ gas chambers. We also provide a general discussion of averaging theory and the proofs of a number of previously known averaging results. In particular, we include a new proof of Anosov's averaging theorem for smooth systems that is primarily due to Dolgopyat.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:41:49 GMT" } ]
"2007-05-23T00:00:00"
[ [ "Wright", "Paul", "" ] ]
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704.0699
Denise Hagnier
Olivier Herbinet (DCPR), Baptiste Sirjean (DCPR), Fr\'ed\'erique Battin-Leclerc (DCPR), Ren\'e Fournet (DCPR), Paul-Marie Marquaire (DCPR)
Thermal decomposition of norbornane (bicyclo[2.2.1]heptane) dissolved in benzene. Experimental study and mechanism investigation
null
Energy and Fuels (2007) sous presse
null
null
physics.chem-ph
null
The thermal decomposition of norbornane (dissolved in benzene) has been studied in a jet stirred reactor at temperatures between 873 and 973 K, at residence times ranging from 1 to 4 s and at atmospheric pressure, leading to conversions from 0.04 to 22.6%. 25 reaction products were identified and quantified by gas chromatography, amongst which the main ones are hydrogen, ethylene and 1,3-cyclopentadiene. A mechanism investigation of the thermal decomposition of the norbornane - benzene binary mixture has been performed. Reactions involved in the mechanism have been reviewed: unimolecular initiations 1 by C-C bond scission of norbornane, fate of the generated diradicals, reactions of transfer and propagation of norbornyl radicals, reactions of benzene and cross-coupling reactions.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:50:35 GMT" } ]
"2016-08-14T00:00:00"
[ [ "Herbinet", "Olivier", "", "DCPR" ], [ "Sirjean", "Baptiste", "", "DCPR" ], [ "Battin-Leclerc", "Frédérique", "", "DCPR" ], [ "Fournet", "René", "", "DCPR" ], [ "Marquaire", "Paul-Marie", "", "DCPR" ] ]
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704.07
Denise Hagnier
Baptiste Sirjean (DCPR), Pierre-Alexandre Glaude (DCPR), M.F. Ruiz-Lopez (SRSMC), Ren\'e Fournet (DCPR)
Detailed kinetic study of the ring opening of cycloalkanes by CBS-QB3 calculations
null
J. Phys. Chem. A 110 (2006) 12693-12704
null
null
physics.chem-ph
null
This work reports a theoretical study of the gas phase unimolecular decomposition of cyclobutane, cyclopentane and cyclohexane by means of quantum chemical calculations. A biradical mechanism has been envisaged for each cycloalkane, and the main routes for the decomposition of the biradicals formed have been investigated at the CBS-QB3 level of theory. Thermochemical data (\delta H^0_f, S^0, C^0_p) for all the involved species have been obtained by means of isodesmic reactions. The contribution of hindered rotors has also been included. Activation barriers of each reaction have been analyzed to assess the 1 energetically most favorable pathways for the decomposition of biradicals. Rate constants have been derived for all elementary reactions using transition state theory at 1 atm and temperatures ranging from 600 to 2000 K. Global rate constant for the decomposition of the cyclic alkanes in molecular products have been calculated. Comparison between calculated and experimental results allowed to validate the theoretical approach. An important result is that the rotational barriers between the conformers, which are usually neglected, are of importance in decomposition rate of the largest biradicals. Ring strain energies (RSE) in transition states for ring opening have been estimated and show that the main part of RSE contained in the cyclic reactants is removed upon the activation process.
[ { "version": "v1", "created": "Thu, 5 Apr 2007 09:51:41 GMT" } ]
"2016-08-14T00:00:00"
[ [ "Sirjean", "Baptiste", "", "DCPR" ], [ "Glaude", "Pierre-Alexandre", "", "DCPR" ], [ "Ruiz-Lopez", "M. F.", "", "SRSMC" ], [ "Fournet", "René", "", "DCPR" ] ]
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