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711.2308
Tridivesh Jena
David Tytler, Mark Gleed, Carl Melis, Angela Chapman, David Kirkman, Dan Lubin, Pascal Paschos, Tridivesh Jena and Arlin P.S. Crotts
Metal Absorption Systems in Spectra of Pairs of QSOs
36 pages with 25 figures and 10 Tables Submited to MNRAS
null
10.1111/j.1365-2966.2008.14159.x
null
astro-ph
null
We present the first large sample of absorption systems in paired QSOs consisting of 691 absorption systems in the spectra of 310 QSOs including 170 pairings. All these absorption systems have metal lines, usually C IV or Mg II. We see 17 cases of absorption in one line-of-sight within 200 km/s (1 Mpc) of absorption in the paired line-of-sight with the probability at least approx 50% at 100kpc, declining rapidly to 23% at 100 - 200 kpc. We detect clustering on 0.5Mpc scales and see a hint of the "fingers of God" redshift-space distortion. The distribution matches absorbers arising in galaxies at z=2 with a normal correlation function and systematic infall velocities but unusually low random pair-wise velocity differences. Absorption in gas flowing out from galaxies at a mean velocity of 250 km/s would produce vastly more elongation than we see. The UV absorption from fast winds that Adelberger et al. 2005 see in spectra of LBGs is not representative of the absorption that we see. Either the winds are confined to LBGs, or they can not extend to 40 kpc with large velocities, while continuing to make UV absorption we see, implying most metals were in place in the IGM long before z=2. Separately, when we examine the absorption seen when a sight line passes a second QSO, we see 19 absorbers within 400 km/s of the partner QSO. The probability of seeing absorption is approximately constant for impact parameters 0.1 - 1.5 Mpc. Perhaps we do not see a rapid rise in the probability at small impact parameters because the UV from QSOs destroys some absorbers near to the QSOs. The 3D distribution of 64 absorbers around 313 QSOs is to first order isotropic, with just a hint of the anisotropy expected if the QSO UV emission is beamed, or alternatively QSOs might emit UV isotropically but for a surprisingly short time of only 0.3Myr.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:58:15 GMT" }, { "version": "v2", "created": "Sat, 17 Nov 2007 01:21:00 GMT" } ]
2017-02-01T00:00:00
[ [ "Tytler", "David", "" ], [ "Gleed", "Mark", "" ], [ "Melis", "Carl", "" ], [ "Chapman", "Angela", "" ], [ "Kirkman", "David", "" ], [ "Lubin", "Dan", "" ], [ "Paschos", "Pascal", "" ], [ "Jena", "Tridivesh", "" ], [ "Crotts", "Arlin P. S.", "" ] ]
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711.2309
Le Hur Karyn
Peter P. Orth, Ivan Stanic, Karyn Le Hur
Dissipative Quantum Ising model in a cold atomic spin-boson mixture
4 pages, 2 figures, 1 table; Title modified and cosmetic changes
Phys. Rev. A 77, 051601(R) (2008)
10.1103/PhysRevA.77.051601
null
cond-mat.other
null
Using cold bosonic atoms with two (hyperfine) ground states, we introduce a spin-boson mixture which allows to implement the quantum Ising model in a tunable dissipative environment. The first specie lies in a deep optical lattice with tightly confining wells and forms a spin array; spin-up/down corresponds to occupation by one/no atom at each site. The second specie forms a superfluid reservoir. Different species are coupled coherently via laser transitions and collisions. Whereas the laser coupling mimics a transverse field for the spins, the coupling to the reservoir sound modes induces a ferromagnetic (Ising) coupling as well as dissipation. This gives rise to an order-disorder quantum phase transition where the effect of dissipation can be studied in a controllable manner.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 23:06:04 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 17:32:38 GMT" }, { "version": "v3", "created": "Mon, 24 Mar 2008 15:55:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Orth", "Peter P.", "" ], [ "Stanic", "Ivan", "" ], [ "Hur", "Karyn Le", "" ] ]
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711.231
Simon Kochen
John Conway and Simon Kochen
Thou Shalt Not Clone One Bit!
null
null
null
null
quant-ph
null
We prove a no-triplets theorem for spin 1 particles, which implies a strengthened form of the no-cloning theorem.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 21:49:32 GMT" } ]
2007-11-16T00:00:00
[ [ "Conway", "John", "" ], [ "Kochen", "Simon", "" ] ]
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711.2311
Leonardo Pati\~no
Axel de la Macorra, Leonardo Patino (UNAM, Mexico)
Cosmological consequences of scalar mesons from gauge/gravity correspondence
14 pages, 9 figures
Nuovo Cim.B124:525-538,2009
10.1393/ncb/i2009-10789-3
null
hep-th astro-ph
null
We consider the spectrum of mesons for the gauge theory dual to a supergravity configuration of intersecting D3/D7 branes, and use the expression for the Lagrangian of the scalar mesons to compute explicitly the Lagrangian for the lightest states in the infrared limit. Assuming that the matter content of this gauge theory is part of a hidden sector, which interacts with the standard model only via gravity, we explore the cosmological consequences of these lightest scalar mesons for a FRW universe. We show that phantom fields may appear naturally in this kind of scenarios.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:51:42 GMT" } ]
2009-12-08T00:00:00
[ [ "de la Macorra", "Axel", "", "UNAM, Mexico" ], [ "Patino", "Leonardo", "", "UNAM, Mexico" ] ]
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711.2312
Mark Dijkstra
Mark Dijkstra, Abraham Loeb
The Polarization of Scattered Lyman Alpha Radiation Around High-Redshift Galaxies
14 pages, 12 figures, matches version published in MNRAS. Discussion on polarization dependence of phase function added in Appendix
null
10.1111/j.1365-2966.2008.13066.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The high-redshift Universe contains luminous Lyman Alpha (hereafter Lya) emitting sources such as galaxies and quasars. The emitted Lya radiation is often scattered by surrounding neutral hydrogen atoms. We show that the scattered Lya radiation obtains a high level of polarization for a wide range of likely environments of high-redshift galaxies. For example, the back-scattered Lya flux observed from galaxies surrounded by a superwind-driven outflow may reach a fractional polarization as high as ~40%. Equal levels of polarization may be observed from neutral collapsing protogalaxies. Resonant scattering in the diffuse intergalactic medium typically results in a lower polarization amplitude (<7%), which depends on the flux of the ionizing background. Spectral polarimetry can differentiate between Lya scattering off infalling gas and outflowing gas; for an outflow the polarization should increase towards longer wavelengths while for infall the opposite is true. Our numerical results suggest that Lya polarimetry is feasible with existing instruments, and may provide a new diagnostic of the distribution and kinematics of neutral hydrogen around high-redshift galaxies. Moreover, polarimetry may help suppress infrared lines originating in the Earth's atmosphere, and thus improve the sensitivity of ground-based observations to high-redshift Lya emitting galaxies outside the currently available redshift windows.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:46:54 GMT" }, { "version": "v2", "created": "Wed, 16 Jul 2008 16:08:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Dijkstra", "Mark", "" ], [ "Loeb", "Abraham", "" ] ]
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711.2313
Alexei Moiseev
V.P. Arkhipova (1), T.A. Lozinskaya (1), A.V. Moiseev (2), O.V. Egorov (1) ((1) Sternberg Astronomical Institute, Moscow, Russia, (2) Special Astrophysical Observatory, Russia)
The gas emission spectrum in a star-forming region in the BCD galaxy VII Zw 403 (UGC 6456)
9 pages, 6 EPS figures
Astron.Rep.51:871-881,2007
10.1134/S1063772907110017
Astron. Reports, 2007, vol. 51, N 11, pp. 871-881
astro-ph
null
Observations with the 6-m telescope of the Special Astrophysical Observatory obtained with the MPFS integral-field spectrograph and a longslit spectrograph with the SCORPIO focal reducer are used to analyze the emission spectrum of the ionized gas in a star-forming region in the BCD galaxy VII Zw 403. We present images of the galactic central region in the H-alpha, H-beta, [SII], and [OIII] emission lines, together with maps of the relative [OIII]/H-beta and [SII]/H-alpha intensities. We have determined the parameters of the gas in bright ionized supershells, and estimated the relative abundances of oxygen, nitrogen, and sulfur; a low relative N/O abundance was detected.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 22:20:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Arkhipova", "V. P.", "" ], [ "Lozinskaya", "T. A.", "" ], [ "Moiseev", "A. V.", "" ], [ "Egorov", "O. V.", "" ] ]
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711.2314
Kevin E. Bassler
Min Liu and Kevin E. Bassler
Finite size effects and symmetry breaking in the evolution of networks of competing Boolean nodes
30 pages, 8 figures, 3 tables
null
null
null
cond-mat.stat-mech cond-mat.dis-nn nlin.AO physics.bio-ph physics.soc-ph q-bio.PE
null
The effects of the finite size of the network on the evolutionary dynamics of a Boolean network are analyzed. In the model considered, Boolean networks evolve via a competition between nodes that punishes those in the majority. It is found that finite size networks evolve in a fundamentally different way than infinitely large networks do. The symmetry of the evolutionary dynamics of infinitely large networks that selects for canalizing Boolean functions is broken in the evolutionary dynamics of finite size networks. In finite size networks there is an additional selection for input inverting Boolean functions that output a value opposite to the majority of input values. These results are revealed through an empirical study of the model that calculates the frequency of occurrence of the different possible Boolean functions. Classes of functions are found to occur with the same frequency. Those classes depend on the symmetry of the evolutionary dynamics and correspond to orbits of the relevant symmetry group. The empirical results match analytic results, determined by utilizing Polya's theorem, for the number of orbits expected in both finite size and infinitely large networks. The reason for the symmetry breaking in the evolutionary dynamics is found to be due to the need for nodes in finite size networks to behave differently in order to cooperate so that the system collectively performs as well as possible. The results suggest that both finite size effects and symmetry are important for understanding the evolution of real-world complex networks, including genetic regulatory networks.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 22:44:46 GMT" } ]
2016-09-08T00:00:00
[ [ "Liu", "Min", "" ], [ "Bassler", "Kevin E.", "" ] ]
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711.2315
Margaret Reid
E. G. Cavalcanti and M. D. Reid
Uncertainty relations for the realisation of macroscopic quantum superpositions and EPR paradoxes
9 pages, 2 figures, to appear Journ Mod Optics work presented at PQE 2007 conference
Journal of Modern Optics, 54, 2373 (2007)
10.1080/09500340701639623
null
quant-ph
null
We present a unified approach, based on the use of quantum uncertainty relations, for arriving at criteria for the demonstration of the EPR paradox and macroscopic superpositions. We suggest to view each criterion as a means to demonstrate an EPR-type paradox, where there is an inconsistency between the assumptions of a form of realism, either macroscopic realism (MR) or local realism (LR), and the completeness of quantum mechanics.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 22:55:51 GMT" } ]
2008-06-18T00:00:00
[ [ "Cavalcanti", "E. G.", "" ], [ "Reid", "M. D.", "" ] ]
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711.2316
Benjamin Monreal
Benjamin Monreal, Lorne A. Nelson, and Joseph A. Formaggio
Spallation nuclei in substellar objects: a new dark-matter signature?
preprint, 9 pages, 3 figures
null
null
null
astro-ph
null
Although dark matter makes up 80% of the gravitational mass of our Galaxy, its composition is not known. One hypothesis is that dark matter consists of massive particles called WIMPs. WIMPs are expected to accumulate and coannihilate in the cores of stars, but the only signature of this accumulation has been thought to be hard- to-observe high-energy neutrinos. Here we propose an entirely new observable signature. WIMP coannihilations in the core of a very low-mass star, brown dwarf, or planetary-mass object should alter the star's chemical composition via spallation reactions. Very close to the Galactic center, these stars may acquire extremely high lithium, beryllium, and boron abundances, even for models with otherwise- undetectable WIMP-nucleon cross sections. These abundances should be measurable in certain stellar systems and phenomena.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 23:06:15 GMT" } ]
2007-11-16T00:00:00
[ [ "Monreal", "Benjamin", "" ], [ "Nelson", "Lorne A.", "" ], [ "Formaggio", "Joseph A.", "" ] ]
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711.2317
Massimo Persic
Massimo Persic (INAF & INFN, Trieste), Alessandro De Angelis (Udine U. & INFN, Udine)
Intergalactic absorption and blazar gamma-ray spectra
A&A, in press (accepted Jan 29, 2008): 6 pages, 2 figures. One source, published subsequent to acceptance, added
null
10.1051/0004-6361:20079074
null
astro-ph
null
The distribution of TeV spectral slopes versus redshift for currently known TeV blazars (16 sources with z<0.21, and one with z>0.25) is essentially a scatter plot with hardly any hint of a global trend. We suggest that this is the outcome of two combined effects of intergalactic gamma-gamma absorption, plus an inherent feature of the SSC (synchro-self-Compton) process of blazar emission. First, flux dimming introduces a bias that favors detection of progressively more flaring sources at higher redshifts. According to mainstream SSC models, more flaring source states imply sources with flatter TeV slopes. This results in a structured relation between intrinsic TeV slope and redshift. The second effect, spectral steepening by intergalactic absorption, affects sources progressively with distance and effectively wipes out the intrinsic slope-redshift correlation.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:26:36 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 22:33:24 GMT" }, { "version": "v3", "created": "Mon, 24 Mar 2008 11:40:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Persic", "Massimo", "", "INAF & INFN, Trieste" ], [ "De Angelis", "Alessandro", "", "Udine U.\n & INFN, Udine" ] ]
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711.2318
Sergey Cherkis
Sergey A. Cherkis and Brian Durcan
The 't Hooft-Polyakov Monopole in the Presence of a 't Hooft Operator
11 pages, 7 figures. Exposition improved, appendix added with construction details
Phys.Lett.B671:123-127,2009
10.1016/j.physletb.2008.11.065
TCDMATH 07-22, HMI 07-09
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present explicit BPS field configurations representing one nonabelian monopole with one minimal weight 't Hooft operator insertion. We explore the SO(3) and SU(2) gauge groups. In the case of SU(2) gauge group the minimal 't Hooft operator can be completely screened by the monopole. If the gauge group is SO(3), however, such screening is impossible. In the latter case we observe a different effect of the gauge symmetry enhancement in the vicinity of the 't Hooft operator.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 23:30:48 GMT" }, { "version": "v2", "created": "Tue, 2 Dec 2008 18:02:32 GMT" } ]
2009-01-16T00:00:00
[ [ "Cherkis", "Sergey A.", "" ], [ "Durcan", "Brian", "" ] ]
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711.2319
Wen Zhao
Wen Zhao
Statefinder diagnostic for Yang-Mills dark energy model
13 pages, 3figures, minor typos corrected
Int.J.Mod.Phys.D17:1245-1254,2008
10.1142/S0218271808012796
null
gr-qc astro-ph.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the statefinder parameters in the Yang-Mills condensate dark energy models, and find that the evolving trajectories of these models are different from those of other dark energy models. We also define two eigenfunctions of the Yang-Mills condensate dark energy models. The values of these eigenfunctions are quite close to zero if the equation-of-state of the Yang-Mills condensate is not far from -1, which can be used to simply differentiate between the Yang-Mills condensate models and other dark energy models.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 23:52:17 GMT" }, { "version": "v2", "created": "Sun, 25 Nov 2007 01:20:56 GMT" }, { "version": "v3", "created": "Fri, 28 Nov 2008 21:36:26 GMT" } ]
2009-04-10T00:00:00
[ [ "Zhao", "Wen", "" ] ]
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711.232
Tom H. Koornwinder
Tom H. Koornwinder
Zhedanov's Algebra AW(3) and the Double Affine Hecke Algebra in the Rank One Case. II. The Spherical Subalgebra
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/ In v2 remarks about duality anti-algebra isomorphism and about shift operators added
SIGMA 4 (2008), 052, 17 pages
10.3842/SIGMA.2008.052
null
math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper builds on the previous paper arXiv:math/0612730 by the author, where a relationship between Zhedanov's algebra AW(3) and the double affine Hecke algebra (DAHA) corresponding to the Askey-Wilson polynomials was established. It is shown here that the spherical subalgebra of this DAHA is isomorphic to AW(3) with an additional relation that the Casimir operator equals an explicit constant. A similar result with q-shifted parameters holds for the antispherical subalgebra. Some theorems on centralizers and centers for the algebras under consideration will finally be proved as corollaries of the characterization of the spherical and antispherical subalgebra.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 23:58:24 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 07:45:55 GMT" }, { "version": "v3", "created": "Tue, 10 Jun 2008 15:19:44 GMT" } ]
2008-06-10T00:00:00
[ [ "Koornwinder", "Tom H.", "" ] ]
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711.2321
Cora Dvorkin
Cora Dvorkin (U. Chicago), Hiranya V. Peiris (U. Chicago/Cambridge), and Wayne Hu (U. Chicago)
Testable polarization predictions for models of CMB isotropy anomalies
17 pages, 15 figures; published in PRD; references added
Phys.Rev.D77:063008,2008
10.1103/PhysRevD.77.063008
null
astro-ph
null
Anomalies in the large-scale CMB temperature sky measured by WMAP have been suggested as possible evidence for a violation of statistical isotropy on large scales. In any physical model for broken isotropy, there are testable consequences for the CMB polarization field. We develop simulation tools for predicting the polarization field in models that break statistical isotropy locally through a modulation field. We study two different models: dipolar modulation, invoked to explain the asymmetry in power between northern and southern ecliptic hemispheres, and quadrupolar modulation, posited to explain the alignments between the quadrupole and octopole. For the dipolar case, we show that predictions for the correlation between the first 10 multipoles of the temperature and polarization fields can typically be tested at better than the 98% CL. For the quadrupolar case, we show that the polarization quadrupole and octopole should be moderately aligned. Such an alignment is a generic prediction of explanations which involve the temperature field at recombination and thus discriminate against explanations involving foregrounds or local secondary anisotropy. Predicted correlations between temperature and polarization multipoles out to l = 5 provide tests at the ~ 99% CL or stronger for quadrupolar models that make the temperature alignment more than a few percent likely. As predictions of anomaly models, polarization statistics move beyond the a posteriori inferences that currently dominate the field.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 00:23:47 GMT" }, { "version": "v2", "created": "Fri, 25 Apr 2008 21:51:55 GMT" } ]
2008-12-18T00:00:00
[ [ "Dvorkin", "Cora", "", "U. Chicago" ], [ "Peiris", "Hiranya V.", "", "U. Chicago/Cambridge" ], [ "Hu", "Wayne", "", "U. Chicago" ] ]
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711.2322
Yoshiaki Koma
Yoshiaki Koma, Miho Koma, Hartmut Wittig
Relativistic corrections to the static potential at O(1/m) and O(1/m^2)
10 pages, Talk presented at Lattice 2007 (Hadron spectroscopy)
PoSLAT2007:111,2007
null
MKPH-T-07-15
hep-lat hep-ph nucl-th
null
We investigate the relativistic corrections to the static potential, i.e. the O(1/m) potential and the O(1/m^2) velocity-dependent potentials, in SU(3) lattice gauge theory. They are important ingredients of potential nonrelativistic QCD for heavy quarkonium. Utilizing the multi-level algorithm, we obtain remarkably clean signals of these potentials up to r=0.9 fm. We observe long range nonperturbative contributions to these corrections.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 00:14:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Koma", "Yoshiaki", "" ], [ "Koma", "Miho", "" ], [ "Wittig", "Hartmut", "" ] ]
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711.2323
Mitsusada M. Sano
Hiroyuki Tomita and Mitsusada M. Sano
Irreversible Circulation of Fluctuation and Entropy Production
17pages, no figures, to appear in Progreess of Theoretical Physics, Vol. 119, No.4
null
10.1143/PTP.119.515
null
cond-mat.stat-mech
null
Physical and chemical stochastic processes described by the master equation are investigated. In this paper, we examine the entropy production both for the master equation and for the corresponding Fokker-Planck equation. For the master equation, the exact expression of the entropy production was recently derived by Gaspard using the Kolmogorov-Sinai entropy ({\em J.Stat.Phys.}, \textbf{117} (2004), 599; [Errata; \textbf{126} (2006), 1109 ]). Although Gaspard's expression is derived from a stochastic consideration, it should be noted that Gaspard's expression conincides with the thermodynamical expression. For the corresponding Fokker-Planck equation, by using the detailed imbalance relation which appears in the derivation process of the fluctuation theorem through the Onsger-Machlup theory, the entropy production is expressed in terms of the {\em irreversible circulation of fluctuation}, which was proposed by Tomita and Tomita ({\em Prog.Theor.Phys.}, \textbf{51} (1974), 1731). However, this expression for the corresponding Fokker-Planck equation differs from that of the entropy production for the master equation. This discrepancy is due to the difference between the master equation and the corresponding Fokker-Planck equation, namely the former treats discrete events, but the latter equation is an approximation of the former one. In fact, in the latter equation, the original discrete events are smoothed out. To overcome this difficulty, we propose the {\em path weight principle}. By using this principle, the modified expression of the entropy production for the corresponding Fokker-Planck equation coincides with that of the master equation (i.e., the thermodynamical expression) for a simple chemical reaction system and a diffusion system.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 00:25:01 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 04:56:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Tomita", "Hiroyuki", "" ], [ "Sano", "Mitsusada M.", "" ] ]
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711.2324
Igor Belegradek
Igor Belegradek (Georgia Tech)
Rigidity and relative hyperbolicity of real hyperbolic hyperplane complements
to appear in Pure and Applied Mathematics Quarterly in the special issue in honor of Farrell and Jones
null
null
null
math.GR math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For n>3 we study spaces obtained from finite volume complete real hyperbolic n-manifolds by removing a compact totally geodesic submanifold of codimension two. We prove that their fundamental groups are relative hyperbolic, co-Hopf, biautomatic, residually hyperbolic, not K\"ahler, not isomorphic to lattices in virtually connected real Lie groups, have no nontrivial subgroups with property (T), have finite outer automorphism groups, satisfy Mostow-type Rigidity, have finite asymptotic dimension and rapid decay property, and satisfy Baum-Connes conjecture. We also characterize those lattices in real Lie groups that are isomorphic to relatively hyperbolic groups.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 00:28:51 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 19:46:02 GMT" }, { "version": "v3", "created": "Wed, 24 Dec 2008 23:43:06 GMT" }, { "version": "v4", "created": "Sat, 28 Aug 2010 13:04:29 GMT" } ]
2010-08-31T00:00:00
[ [ "Belegradek", "Igor", "", "Georgia Tech" ] ]
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711.2325
Sarah Morrison
S. Morrison, A.S. Parkins
Collective spin systems in dispersive optical cavity QED: Quantum phase transitions and entanglement
19 pages, 18 figures, shortened version
Phys. Rev. A 77, 043810 (2008)
10.1103/PhysRevA.77.043810
null
quant-ph cond-mat.other
null
We propose a cavity QED setup which implements a dissipative Lipkin-Meshkov-Glick model -- an interacting collective spin system. By varying the external model parameters the system can be made to undergo both first-and second-order quantum phase transitions, which are signified by dramatic changes in cavity output field properties, such as the probe laser transmission spectrum. The steady-state entanglement between pairs of atoms is shown to peak at the critical points and can be experimentally determined by suitable measurements on the cavity output field. The entanglement dynamics also exhibits pronounced variations in the vicinities of the phase transitions.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 00:40:43 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 02:27:41 GMT" } ]
2008-05-07T00:00:00
[ [ "Morrison", "S.", "" ], [ "Parkins", "A. S.", "" ] ]
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711.2326
Daniele Fargion
D.Fargion, M. Gaug, P.Oliva
Reflecting on Cherenkov reflections
4 pages, 4 figures, HEP 2007: The 2007 Europhysics Conference on High Energy Physics
J.Phys.Conf.Ser.110:062008,2008
10.1088/1742-6596/110/6/062008
null
astro-ph
null
Magic Telescope may observe and reveal at horizons lights from air-shower Cherenkov reflections. The ground, the sea, the cloudy sky (below the mountain) may reflect PeVs-EeV UHECR Cherenkov lights observable by MAGIC telescopes. Even rarest UHE neutrino skimming the atmosphere or skimming the Earth may induce upward-horizontal airshowers: a new Neutrino Astronomy. These fluorescence signals or the Cherenkov reflections in upper cloudy sky may flash in correlated BL-Lac or GRB shining at opposite edges. Geomagnetic splitting of Horizontal Air-showers may offer a new spectroscopy of UHECR from the knee up to GZK energy edges.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:29:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Fargion", "D.", "" ], [ "Gaug", "M.", "" ], [ "Oliva", "P.", "" ] ]
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711.2327
David Harrington
D. M. Harrington and J.R. Kuhn
Spectropolarimetric observations of Herbig Ae/Be Stars I: HiVIS spectropolarimetric calibration and reduction techniques
35 pages, 44 figures, Accepted by PASP
null
10.1086/526549
IfA-07-195
astro-ph
null
Using the HiVIS spectropolarimeter built for the Haleakala 3.7m AEOS telescope in Hawaii, we are collecting a large number of high precision spectropolarimetrc observations of stars. In order to precisely measure very small polarization changes, we have performed a number of polarization calibration techniques on the AEOS telescope and HiVIS spectrograph. We have extended our dedicated IDL reduction package and have performed some hardware upgrades to the instrument. We have also used the ESPaDOnS spectropolarimeter on CFHT to verify the HiVIS results with back-to-back observations of MWC 361 and HD163296. Comparision of this and other HiVIS data with stellar observations from the ISIS and WW spectropolarimeters in the literature further shows the usefulness of this instrument.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 00:52:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Harrington", "D. M.", "" ], [ "Kuhn", "J. R.", "" ] ]
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711.2328
Hiroki Takesue
Hiroki Takesue, Yasuhiro Tokura, Hiroshi Fukuda, Tai Tsuchizawa, Toshifumi Watanabe, Koji Yamada, and Sei-ichi Itabashi
Entanglement generation using silicon wire waveguide
8 pages, 3 figures. A part of this content was presented at Eur. Conf. Opt. Commun. ECOC 2007, postdeadline paper 2.3, September 20, 2007, Berlin
Appl. Phys. Lett. 91, 201108 (2007)
10.1063/1.2814040
null
quant-ph
null
We report the first entanglement generation experiment that utilizes a silicon waveguide. Using spontaneous four-wave mixing in a 1.09-cm-long silicon wire waveguide, we generated 1.5-um, high-purity time-bin entangled photons without temperature control, and observed a two-photon interference fringe with >73% visibility.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 01:15:19 GMT" } ]
2007-11-16T00:00:00
[ [ "Takesue", "Hiroki", "" ], [ "Tokura", "Yasuhiro", "" ], [ "Fukuda", "Hiroshi", "" ], [ "Tsuchizawa", "Tai", "" ], [ "Watanabe", "Toshifumi", "" ], [ "Yamada", "Koji", "" ], [ "Itabashi", "Sei-ichi", "" ] ]
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711.2329
Sumanta Tewari
Sumanta Tewari, Chuanwei Zhang, Victor M. Yakovenko, S. Das Sarma
Time-reversal symmetry breaking by a $(d+id)$ density-wave state in underdoped cuprate superconductors
4 pages, 3 eps figures; minor typos corrected, references updated, new title as suggested by the PRL editor; references updated, final version as published in PRL
Phys. Rev. Lett. 100, 217004 (2008)
10.1103/PhysRevLett.100.217004
null
cond-mat.str-el
null
It was proposed that the $id_{x^2-y^2}$ density-wave state (DDW) may be responsible for the pseudogap behavior in the underdoped cuprates. Here we show that the admixture of a small $d_{xy}$ component to the DDW state breaks the symmetry between the counter-propagating orbital currents of the DDW state and, thus, violates the macroscopic time-reversal symmetry. This symmetry breaking results in a non-zero polar Kerr effect, which has recently been observed in the pseudogap phase.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:59:00 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 17:17:16 GMT" }, { "version": "v3", "created": "Wed, 4 Jun 2008 00:29:05 GMT" } ]
2008-06-04T00:00:00
[ [ "Tewari", "Sumanta", "" ], [ "Zhang", "Chuanwei", "" ], [ "Yakovenko", "Victor M.", "" ], [ "Sarma", "S. Das", "" ] ]
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711.233
Hiromi Saida
Hiromi Saida
Black Hole Evaporation and Generalized 2nd Law with Nonequilibrium Thermodynamics
Typo is corrected. 10 pages, 2 figures. Based on proceedings and talks given at: APCTP Jeju Meeting on Gravitation and Cosmology (Jeju, Korea, 2007), Dynamics and Thermodynamics of Black Holes and Naked Singularities II, (Politecnico di Milano, Italy, 2007) and 16th General Relativity and Gravitation (Niigata, Japan, 2006)
null
null
null
gr-qc
null
In general, when a black hole evaporates, there arises a net energy flow from black hole into its outside environment due to Hawking radiation and energy accretion onto black hole. The existence of energy flow means that the thermodynamic state of the whole system, which consists of a black hole and its environment, is in a nonequilibrium state. To know the detail of evaporation process, the nonequilibrium effects of energy flow should be taken into account. The nonequilibrium nature of black hole evaporation is a challenging topic including issues of not only black hole physics but also nonequilibrium physics. Using the nonequilibrium thermodynamics which has been formulated recently, this report shows: (1) the self-gravitational effect of black hole which appears as its negative heat capacity guarantees the validity of generalized 2nd law without entropy production inside the outside environment, (2) the nonequilibrium effect of energy flow tends to shorten the evaporation time (life time) of black hole, and consequently specific nonequilibrium phenomena are suggested. Finally a future direction of this study is commented.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 02:25:37 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 03:39:06 GMT" } ]
2007-11-16T00:00:00
[ [ "Saida", "Hiromi", "" ] ]
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711.2331
Artem Sabourov
A.V. Sabourov, M.I. Pravdin and S.P. Knurenko
A shape of charged particle lateral distribution in individual EAS events with energy above 10^19 eV arriving from different celestial regions
5 pages, 4 figures
null
null
null
astro-ph
null
A shape of lateral distribution for charged particles in events with energy above 10^19eV is considered. Two methods were used for individual LDF parametrization. In the first approach, the index of power was determined for generalized Greisen-Linsley approximation. In second, mean square radius of the shower was determined for approximation proposed by Lagutin et al. Comparison of resulted parameters is presented for individual events arrived from different celestial regions -- Galactic planes and the region with increased flux of particles with E(0)>=10^19eV (according to Yakutsk array): 1.7h-3.7h right ascension; 45-60 degrees declination.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 03:19:11 GMT" } ]
2007-11-16T00:00:00
[ [ "Sabourov", "A. V.", "" ], [ "Pravdin", "M. I.", "" ], [ "Knurenko", "S. P.", "" ] ]
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711.2332
Anton Knigavko
Igor V. Mel'nikov, Anton Knigavko, J. Stewart Aitchison, and Clark A. Merchant
Generation of slow intense optical solitons in a resonance photonic crystal
null
null
10.1140/epjst/e2007-00733-8
null
physics.optics
null
We demonstrate interesting and previously unforeseen properties of a pair of gap solitons in a resonant photonic crystal which are predicted and explained in a physically transparent form using both analytical and numerical methods. The most important result is the fact that an oscillating gap soliton created by the presence of a localized population inversion inside the crystal can be manipulated by means of a proper choice of bit rate, phase and amplitude modulation. Developing this idea, we are able to obtain qualitatively different regimes of a resonant photonic crystal operation. In particular, a noteworthy observation is that both the delay time and amplitude difference must exceed a certain level to ensure effective control over the soliton dynamics.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 03:34:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Mel'nikov", "Igor V.", "" ], [ "Knigavko", "Anton", "" ], [ "Aitchison", "J. Stewart", "" ], [ "Merchant", "Clark A.", "" ] ]
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711.2333
Christopher J. Conselice
Christopher J. Conselice, Sheena Rajgor, Robert Myers (Nottingham)
The Structures of Distant Galaxies I: Galaxy Structures and the Merger Rate to z~3 in the Hubble Ultra-Deep Field
MNRAS, submitted
null
10.1111/j.1365-2966.2008.13069.x
null
astro-ph
null
This paper begins a series in which we examine the structures of distant galaxies to directly determine the history of their formation modes. We start this series by examining the structures of z_F850LP < 27 galaxies in the Hubble Ultra-Deep field, the deepest high-resolution optical image taken to date. We investigate a few basic features of galaxy structure using this image. These include: (1) The agreement of visual eye-ball classifications and non-parametric quantitative (CAS, Gini/M_20) methods; (2) How distant galaxy quantitative structures can vary as a function of rest-frame wavelength; and (3) The evolution of distant galaxy structures up to z~3. One of our major conclusions is that the majority of galaxies with z_850 < 27 are peculiar in appearance, and that galaxy assembly is rapidly occurring at these magnitudes, even up to the present time. We find a general agreement between galaxy classification by eye and through quantitative methods, as well as a general agreement between the CAS and the Gini/M_20 parameters. We find that the Gini/M_20 method appears to find a larger number of galaxy mergers than the CAS system, but contains a larger contamination from non-mergers. We furthermore calculate the merger rate of galaxies in the UDF up to z~3, finding an increase with redshift as well as stellar mass, confirming previous work in the Hubble Deep Field. We find that massive galaxies with M_{*} > 10^10 M_0 undergo 4.3_+0.8^-0.8 major galaxy mergers at z < 3, with all of this merging occurring at z > 1.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 03:52:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Conselice", "Christopher J.", "", "Nottingham" ], [ "Rajgor", "Sheena", "", "Nottingham" ], [ "Myers", "Robert", "", "Nottingham" ] ]
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711.2334
Zoran \v{S}uni\'c
Titu Andreescu and Zoran Sunic
Encouraging the grand coalition in convex cooperative games
null
null
null
null
math.OC
null
A solution function for convex transferable utility games encourages the grand coalition if no player prefers (in a precise sense defined in the text) any coalition to the grand coalition. We show that the Shapley value encourages the grand coalition in all convex games and the tau-value encourages the grand coalitions in convex games up to three (but not more than three) players. Solution functions that encourage the grand coalition in convex games always produce allocations in the core, but the converse is not necessarily true.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 04:13:49 GMT" } ]
2007-11-16T00:00:00
[ [ "Andreescu", "Titu", "" ], [ "Sunic", "Zoran", "" ] ]
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711.2335
Bo-Qiang Ma
Bo-Qiang Ma
Melosh rotation: source of the proton's missing spin
5 latex pages
J.Phys.G17:L53-L58,1991
10.1088/0954-3899/17/5/001
null
hep-ph
null
It is shown that the observed small value of the integrated spin structure function for protons could be naturally understood within the naive quark model by considering the effect from Melosh rotation. The key to this problem lies in the fact that the deep inelastic process probes the light-cone quarks rather than the instant-form quarks, and that the spin of the proton is the sum of the Melosh rotated light-cone spin of the individual quarks rather than simply the sum of the light-cone spin of the quarks directly.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 04:22:59 GMT" } ]
2010-04-15T00:00:00
[ [ "Ma", "Bo-Qiang", "" ] ]
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711.2336
Yasuo Yoshida
Yasuo Yoshida, Tatsuya Kawae, Yuko Hosokoshi, Katsuya Inoue, Nobuya Maeshima, Koichi Okunishi, Kiyomi Okamoto, and Toru Sakai
Magnetic Field versus Temperature Phase Diagram of the Spin-1/2 Alternating Chain Compound F5PNN
5 pages, 5 figures (Submitted to Physical Review B)
null
null
null
cond-mat.str-el
null
We have measured the specific heat of the S = 1/2 alternating Heisenberg antiferromagnetic chain compound pentafluorophenyl nitronyl nitroxide in magnetic fields using a single crystal and powder. A sharp peak due to field-induced magnetic ordering (FIMO) is observed in both samples. The H-T phase boundary of the FIMO of the single crystal is symmetric with respect to the central field of the gapless field region HC1 < H < HC2, whereas it is distorted for the powder whose ordering temperatures are lower. An analysis employing calculations based on the finite temperature density matrix renormalization group indicates the possibility of novel incommensurate ordering due to frustration in the powder around the central field.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 05:12:06 GMT" } ]
2007-11-16T00:00:00
[ [ "Yoshida", "Yasuo", "" ], [ "Kawae", "Tatsuya", "" ], [ "Hosokoshi", "Yuko", "" ], [ "Inoue", "Katsuya", "" ], [ "Maeshima", "Nobuya", "" ], [ "Okunishi", "Koichi", "" ], [ "Okamoto", "Kiyomi", "" ], [ "Sakai", "Toru", "" ] ]
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711.2337
Stefan C. Keller
Stefan C. Keller, Simon Murphy, Sayuri Prior, Gary DaCosta, and Brian Schmidt
Revealing Substructure in the Galactic Halo - The SEKBO RR Lyrae Survey
59 pages, 21 figures. ApJ accepted
null
10.1086/526516
null
astro-ph
null
We present a search for RR Lyrae variable stars from archival observations of the Southern Edgeworth-Kuiper Belt Object survey. The survey covers 1675 square degrees along the ecliptic to a mean depth of V=19.5, i.e. a heliocentric distance of ~50kpc for RR Lyrae stars. The survey reveals 2016 RR Lyrae candidates. Follow-up photometric monitoring of a subset of these candidates shows (24+/-12)% contamination by non-RR Lyrae variables. We derive a map of over-density of RR Lyraes in the halo that reveals a series of structures coincident with the leading and trailing arms of debris from the Sagittarius dwarf galaxy. One of the regions of over-density is found on the trailing arm, 200 deg. from the main body of the Sagittarius dwarf at a distance of ~45kpc. This distant detection of the stellar population of the outer trailing arm of Sagittarius offers a tight constraint on the motion of the dwarf galaxy. A distinctly separate region of over-density is seen towards the Virgo Over Density.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 05:32:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Keller", "Stefan C.", "" ], [ "Murphy", "Simon", "" ], [ "Prior", "Sayuri", "" ], [ "DaCosta", "Gary", "" ], [ "Schmidt", "Brian", "" ] ]
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711.2338
Sergey Golovin
Sergey V. Golovin
On the hierarchy of partially invariant submodels of differential equations
null
J. Phys. A: Math. Theor. 2008 41 265501
10.1088/1751-8113/41/26/265501
null
math-ph math.MP
null
It is noticed, that partially invariant solution (PIS) of differential equations in many cases can be represented as an invariant reduction of some PIS of the higher rank. This introduce a hierarchic structure in the set of all PISs of a given system of differential equations. By using this structure one can significantly decrease an amount of calculations required in enumeration of all PISs for a given system of partially differential equations. An equivalence of the two-step and the direct ways of construction of PISs is proved. In this framework the complete classification of regular partially invariant solutions of ideal MHD equations is given.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 05:20:51 GMT" } ]
2010-08-05T00:00:00
[ [ "Golovin", "Sergey V.", "" ] ]
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711.2339
Teruhisa Baba
T. Baba, T. Yokoya, S. Tsuda, T. Kiss, T. Shimojima, K. Ishizaka, H. Takeya, K. Hirata, T. Watanabe, M. Nohara, H. Takagi, N. Nakai, K. Machida, T. Togashi, S. Watanabe, X.-Y. Wang, C. T. Chen, S. Shin
Bulk electronic structure of the antiferromagnetic superconducting phase in ErNi2B2C
11 pages, 4 figures
Phys. Rev. Lett. 100, 017003 (2008)
10.1103/PhysRevLett.100.017003
null
cond-mat.supr-con
null
We have performed temperature (T) - dependent laser-photoemission spectroscopy of antiferromagnetic (AF) superconductor ErNi2B2C to study the electronic-structure evolution reflecting the interplay between antiferromagnetism and superconductivity. The spectra at the superconducting (SC) phase show a very broad spectral shape. T-dependent SC gap shows a sudden deviation from the BCS prediction just below TN. This observation can be well explained by the theoretical model and thus represents characteristic bulk electronic structure of the AF SC phase for the first time.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 05:25:24 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 05:35:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Baba", "T.", "" ], [ "Yokoya", "T.", "" ], [ "Tsuda", "S.", "" ], [ "Kiss", "T.", "" ], [ "Shimojima", "T.", "" ], [ "Ishizaka", "K.", "" ], [ "Takeya", "H.", "" ], [ "Hirata", "K.", "" ], [ "Watanabe", "T.", "" ], [ "Nohara", "M.", "" ], [ "Takagi", "H.", "" ], [ "Nakai", "N.", "" ], [ "Machida", "K.", "" ], [ "Togashi", "T.", "" ], [ "Watanabe", "S.", "" ], [ "Wang", "X. -Y.", "" ], [ "Chen", "C. T.", "" ], [ "Shin", "S.", "" ] ]
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711.234
Felipe Cervantes-Sodi
F. Cervantes-Sodi, G. Cs\'anyi, S. Piscanec, A. C. Ferrari
Edge-functionalized and substitutional doped graphene nanoribbons: electronic and spin properties
12 pages, 5 figures
Phys. Rev. B 77, 165427 (2008)
10.1103/PhysRevB.77.165427
null
cond-mat.mtrl-sci
null
Graphene nanoribbons are the counterpart of carbon nanotubes in graphene-based nanoelectronics. We investigate the electronic properties of chemically modified ribbons by means of density functional theory. We observe that chemical modifications of zigzag ribbons can break the spin degeneracy. This promotes the onset of a semiconducting-metal transition, or of an half-semiconducting state, with the two spin channels having a different bandgap, or of a spin-polarized half-semiconducting state -where the spins in the valence and conduction bands are oppositely polarized. Edge functionalization of armchair ribbons gives electronic states a few eV away from the Fermi level, and does not significantly affect their bandgap. N and B produce different effects, depending on the position of the substitutional site. In particular, edge substitutions at low density do not significantly alter the bandgap, while bulk substitution promotes the onset of semiconducting-metal transitions. Pyridine-like defects induce a semiconducting-metal transition.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:31:30 GMT" } ]
2009-09-29T00:00:00
[ [ "Cervantes-Sodi", "F.", "" ], [ "Csányi", "G.", "" ], [ "Piscanec", "S.", "" ], [ "Ferrari", "A. C.", "" ] ]
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711.2341
Nikodem Poplawski
Nikodem J. Poplawski
Conservation laws for a general Lorentz connection
7 pages
null
null
null
gr-qc math-ph math.MP
null
We derive conservation laws for energy-momentum (canonical and dynamical) and angular momentum for a general Lorentz connection.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:00:00 GMT" } ]
2008-01-03T00:00:00
[ [ "Poplawski", "Nikodem J.", "" ] ]
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711.2342
Shunsuke Takagi
Shunsuke Takagi
Adjoint ideals along closed subvarieties of higher codimension
17 pages; v.2: minor changes, to appear in Crelles Journal
null
null
null
math.AG math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we introduce a notion of adjoint ideal sheaves along closed subvarieties of higher codimension and study its local properties using characteristic $p$ methods. When $X$ is a normal Gorenstein closed subvariety of a smooth complex variety $A$, we formulate a restriction property of the adjoint ideal sheaf $\adj_X(A)$ of $A$ along $X$ involving the l.c.i. ideal sheaf $\mathcal{D}_X$ of $X$. The proof relies on a modification of generalized test ideals of Hara and Yoshida.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 05:39:51 GMT" }, { "version": "v2", "created": "Wed, 17 Dec 2008 09:03:46 GMT" } ]
2008-12-17T00:00:00
[ [ "Takagi", "Shunsuke", "" ] ]
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711.2343
Mohan Sarovar
Mohan Sarovar, Kevin C. Young, Thomas Schenkel, and K. Birgitta Whaley
Quantum non-demolition measurements of single donor spins in semiconductors
8+ pages. 4 figures. Published version
Phys. Rev. B, 78, 245302 (2008)
10.1103/PhysRevB.78.245302
null
cond-mat.mes-hall quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a technique for measuring the state of a single donor electron spin using a field-effect transistor induced two-dimensional electron gas and electrically detected magnetic resonance techniques. The scheme is facilitated by hyperfine coupling to the donor nucleus. We analyze the potential sensitivity and outline experimental requirements. Our measurement provides a single-shot, projective, and quantum non-demolition measurement of an electron-encoded qubit state.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:08:35 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 16:59:50 GMT" }, { "version": "v3", "created": "Mon, 5 Jan 2009 03:38:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Sarovar", "Mohan", "" ], [ "Young", "Kevin C.", "" ], [ "Schenkel", "Thomas", "" ], [ "Whaley", "K. Birgitta", "" ] ]
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711.2344
Morbidelli Alessandro
Alessandro Morbidelli (OCA), Aurelien Crida, Frederic Masset, Richard P. Nelson
Building Giant-Planet Cores at a Planet Trap
in press in Astronomy and Astrophysics
null
10.1051/0004-6361:20078546
null
astro-ph
null
A well-known bottleneck for the core-accretion model of giant-planet formation is the loss of the cores into the star by Type-I migration, due to the tidal interactions with the gas disk. It has been shown that a steep surface-density gradient in the disk, such as the one expected at the boundary between an active and a dead zone, acts as a planet trap and prevents isolated cores from migrating down to the central star. We study the relevance of the planet trap concept for the accretion and evolution of systems of multiple planetary embryos/cores. We performed hydrodynamical simulations of the evolution of systems of multiple massive objects in the vicinity of a planet trap. The planetary embryos evolve in 3 dimensions, whereas the disk is modeled with a 2D grid. Synthetic forces are applied onto the embryos to mimic the damping effect that the disk has on their inclinations. Systems with two embryos tend to acquire stable, separated and non-migrating orbits, with the more massive embryo placed at the planet trap and the lighter one farther out in the disk. Systems of multiple embryos are intrinsically unstable. Consequently, a long phase of mutual scattering can lead to accreting collisions among embryos; some embryos are injected into the inner part of the disk, where they can be evacuated into the star by Type I migration. The system can resume a stable, non-migrating configuration only when the number of surviving embryos decreases to a small value (~2-4). This can explain the limited number of giant planets in our solar system. These results should apply in general to any case in which the Type-I migration of the inner embryo is prevented by some mechanism, and not solely to the planet trap scenario.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:10:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Morbidelli", "Alessandro", "", "OCA" ], [ "Crida", "Aurelien", "" ], [ "Masset", "Frederic", "" ], [ "Nelson", "Richard P.", "" ] ]
[ 0.0376713313, 0.0914801061, 0.1173726618, 0.0393577218, 0.014969944, 0.1244295537, 0.0317559987, 0.0316781662, -0.0245045274, -0.0689603314, 0.0352844447, 0.0066871801, -0.0783522204, -0.0474523865, -0.0650167763, 0.0352844447, 0.0184594709, -0.0250104442, 0.0198604707, 0.0343245007, 0.0411997773, -0.0107150553, 0.0381383337, 0.0776257738, -0.0344023332, -0.0479972214, 0.0384496637, 0.1629310995, 0.0452211648, 0.0772625506, 0.1757995486, 0.0349471644, -0.0801164433, -0.0246342495, -0.097084105, 0.1142593324, 0.0156445, 0.1212124377, -0.0764323324, 0.0430158861, 0.0410441086, 0.0677668899, -0.0103388606, 0.1049712226, -0.0618515536, 0.1062165499, 0.004663514, -0.0369189419, 0.0245823599, 0.0748756677, -0.08873, -0.0104491245, 0.0749275535, -0.0310036093, -0.1545251012, -0.1032069996, 0.0353882201, 0.0486717746, -0.1072024405, 0.0392020531, 0.0127062909, 0.0219100825, 0.0308219995, 0.0186540559, 0.0441055559, -0.0325602777, -0.0617477745, -0.0247639716, -0.0054872497, 0.0749794394, -0.0866544396, -0.0821401104, -0.0171622504, -0.0998342186, 0.007082833, -0.0402138866, -0.0503062755, 0.0460513867, -0.0886262208, -0.0114804162, 0.0663658902, -0.0364778861, 0.1059052199, -0.0531861112, 0.0201328881, -0.0639789999, 0.0348174423, 0.0064309789, -0.1260899901, -0.0272157211, 0.0050299792, -0.0440536663, -0.051992666, 0.0452211648, 0.062785551, -0.0070114858, 0.0782484412, -0.0252958331, 0.0962538868, 0.0285129435, -0.0268784445, -0.0982775539, -0.0088211112, 0.0584268868, 0.0796494409, -0.1040891111, -0.0519148335, 0.0700500011, 0.0460254438, -0.0246991105, 0.0170584712, -0.0055553541, -0.0143732214, 0.0119149862, 0.0038722083, -0.0133873327, 0.0365297757, 0.1009757742, -0.0739935562, 0.1097968891, 0.0304847211, -0.0018923229, -0.0657951087, 0.0351028331, 0.0765879974, -0.0509289429, 0.0311852209, 0.0070698611, -0.0889894441, -0.0779371113, -0.032404609, 0.0189913325, -0.0059023611, -0.1011314392, -0.1042447761, -0.0182519164, 0.0025409339, 0.0784559995, 0.0848902166, 0.0797532201, -0.0086200414, 0.0047024302, 0.0220268331, 0.0112598883, 0.0035641179, 0.1135328859, -0.0266708881, 0.0644978881, -0.0471929424, 0.0962019935, 0.0233110823, 0.025931472, -0.034973111, 0.018368667, 0.0545352213, -0.0831260011, -0.0127452081, 0.0571296662, 0.0595684424, -0.1250522137, -0.0550541095, -0.0124403611, -0.0575966649, 0.0663139969, -0.033883445, 0.0780927762, -0.1027918831, -0.0089054303, -0.1673935503, -0.0201847777, 0.0210928321, -0.094437778, -0.1406188905, 0.0325343311, -0.0257758051, 0.0256590545, -0.0779371113, -0.0261649713, -0.024167249, 0.0208723042, -0.035258498, 0.0162152778, -0.0041381386, -0.0335202217, 0.0150477774, 0.0443131104, -0.0322229974, 0.0307960548, -0.040032275, -0.0015080208, -0.07186611, -0.0118436385, 0.1452888846, 0.077885218, 0.039072331, -0.0957349986, 0.0097291665, 0.0372562222, 0.0354401097, 0.0422635004, 0.1039334387, 0.0050072777, 0.0671442226, -0.0765879974, -0.0759134442, -0.014489972, 0.07596533, 0.1031551063, 0.0255941935, 0.0271119438, 0.089300774, -0.0343763866, -0.0338056087, -0.0173179153, -0.0142694442, -0.0105529027, -0.0902866647, 0.1031032205, 0.0312630534, 0.0341947749, 0.018433528, 0.0573891103, -0.0244007483, 0.0962538868, -0.0174216945, 0.0791824386, 0.0309776664, -0.0278902762, 0.0762766674, 0.0462589413, 0.0072190412, 0.0606062189, -0.0010256163, -0.0574928857, 0.0208593328, 0.0044008261, -0.0435347781, 0.0462329984, 0.0644459948, -0.0041575972, -0.0334683321, 0.094749108, -0.0919471085, -0.0629931092, -0.0854091048, 0.0690122172, -0.0237651095, -0.0328197218, -0.000050394, 0.0790267736, 0.1709219962, -0.0409662761, 0.0496576652, 0.1054901108, -0.0185762215, -0.0175384432 ]
711.2345
Anne-Laure Fougeres
Anne-Laure Foug\`eres (MODAL'X), John P. Nolan, Holger Rootz\'en
Models for dependent extremes using stable mixtures
null
Scandinavian Journal of Statistics 36 (2009) 42-59
10.1111/j.1467-9469.2008.00613.x
null
stat.ME math.ST stat.TH
null
This paper unifies and extends results on a class of multivariate Extreme Value (EV) models studied by Hougaard, Crowder, and Tawn. In these models both unconditional and conditional distributions are EV, and all lower-dimensional marginals and maxima belong to the class. This leads to substantial economies of understanding, analysis and prediction. One interpretation of the models is as size mixtures of EV distributions, where the mixing is by positive stable distributions. A second interpretation is as exponential-stable location mixtures (for Gumbel) or as power-stable scale mixtures (for non-Gumbel EV distributions). A third interpretation is through a Peaks over Thresholds model with a positive stable intensity. The mixing variables are used as a modeling tool and for better understanding and model checking. We study extreme value analogues of components of variance models, and new time series, spatial, and continuous parameter models for extreme values. The results are applied to data from a pitting corrosion investigation.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:13:08 GMT" } ]
2013-09-30T00:00:00
[ [ "Fougères", "Anne-Laure", "", "MODAL'X" ], [ "Nolan", "John P.", "" ], [ "Rootzén", "Holger", "" ] ]
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711.2346
Emma Jin
Emma Y. Jin and Christian M. Reidys
$k$-noncrossing RNA structures with arc-length $\ge 3$
17 pages, 4 figures
null
null
null
q-bio.BM
null
In this paper we enumerate $k$-noncrossing RNA pseudoknot structures with given minimum arc- and stack-length. That is, we study the numbers of RNA pseudoknot structures with arc-length $\ge 3$, stack-length $\ge \sigma$ and in which there are at most $k-1$ mutually crossing bonds, denoted by ${\sf T}_{k,\sigma}^{[3]}(n)$. In particular we prove that the numbers of 3, 4 and 5-noncrossing RNA structures with arc-length $\ge 3$ and stack-length $\ge 2$ satisfy ${\sf T}_{3,2}^{[3]}(n)^{}\sim K_3 n^{-5} 2.5723^n$, ${\sf T}^{[3]}_{4,2}(n)\sim K_4 n^{-{21/2}} 3.0306^n$, and ${\sf T}^{[3]}_{5,2}(n)\sim K_5 n^{-18} 3.4092^n$, respectively, where $K_3,K_4,K_5$ are constants. Our results are of importance for prediction algorithms for RNA pseudoknot structures.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:34:09 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 09:37:37 GMT" } ]
2007-12-04T00:00:00
[ [ "Jin", "Emma Y.", "" ], [ "Reidys", "Christian M.", "" ] ]
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711.2347
Dr. Alok Banerjee
A. Banerjee, Kranti Kumar and P. Chaddah
Recrystallization of glass: homogeneous vs. heterogeneous nucleation in La(0.5)Ca(0.5)MnO3
null
null
null
null
cond-mat.str-el cond-mat.mtrl-sci cond-mat.stat-mech
null
We probe through magnetization and resistivity measurements a kinetically arrested glass-like but long-range ordered magnetic state. The transformation kinetics of the magnetic field-temperature induced broad first-order transition from ferromagnetic-metallic (FMM) to antiferromagnetic-insulating (AFI) state gets hindered at low temperature in a La(0.5)Ca(0.5)MnO3 sample. A fraction of high-temperature FMM phase persists to the lowest temperature, albeit as a non-ergodic state. We present a phenomenology for this glass-like but long-range order FMM phase which devitrifies on heating and converts to equilibrium AFI phase. The residual kinetically arrested FMM phase can be `recrystallized' to AFI state by annealing and more efficiently by successive annealing, presumably by heterogeneous nucleation. This glass-like state shows a stimulating feature that when the fraction of glass is larger the `recrystallization' is easier.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:01:05 GMT" } ]
2007-11-16T00:00:00
[ [ "Banerjee", "A.", "" ], [ "Kumar", "Kranti", "" ], [ "Chaddah", "P.", "" ] ]
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711.2348
Artem Sabourov
S.P. Knurenko, A.A. Ivanov, A.V. Sabourov and I.Ye. Sleptsov
Average mass composition of primary cosmic rays in the superhigh energy region by Yakutsk complex EAS array data
5 pages, 2 figures
null
null
null
astro-ph
null
The characteristics relating to the lateral and longitudinal development of EAS in the energy region of 10^15-10^19eV have been analyzed in the framework of the QGSJET model and of mass composition of primary cosmic rays. It is found that at E(0) >= 5*10^15eV the mean mass composition of primary cosmic rays begins to vary as indicated by a rise of <ln A> with increasing energy. The maximum value of <ln A> is observed at E(0) ~ (5-50)*10^16eV. It is confirmed by data of many compact EAS arrays and does not contradict an anomalous diffusion model of cosmic ray propagation in our Galaxy. In the superhigh energy region (>=10^18eV) the value <ln A> begins to decrease, i.e. the mass composition becomes lighter and consists of protons and nuclei of He and C. It does not contradict our earlier estimations for the mass composition and points to a growing role of the metagalactic component of cosmic rays in the superhigh energy region.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:50:43 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 01:42:12 GMT" } ]
2007-11-19T00:00:00
[ [ "Knurenko", "S. P.", "" ], [ "Ivanov", "A. A.", "" ], [ "Sabourov", "A. V.", "" ], [ "Sleptsov", "I. Ye.", "" ] ]
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711.2349
Samuel M\"uller
Samuel Mueller, A.H. Welsh
Robust model selection in generalized linear models
24 pages, 1 figure, submitted to JASA
null
null
null
stat.ME
null
In this paper, we extend to generalized linear models (including logistic and other binary regression models, Poisson regression and gamma regression models) the robust model selection methodology developed by Mueller and Welsh (2005; JASA) for linear regression models. As in Mueller and Welsh (2005), we combine a robust penalized measure of fit to the sample with a robust measure of out of sample predictive ability which is estimated using a post-stratified m-out-of-n bootstrap. A key idea is that the method can be used to compare different estimators (robust and nonrobust) as well as different models. Even when specialized back to linear regression models, the methodology presented in this paper improves on that of Mueller and Welsh (2005). In particular, we use a new bias-adjusted bootstrap estimator which avoids the need to centre the explanatory variables and to include an intercept in every model. We also use more sophisticated arguments than Mueller and Welsh (2005) to establish an essential monotonicity condition.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:56:50 GMT" } ]
2007-11-16T00:00:00
[ [ "Mueller", "Samuel", "" ], [ "Welsh", "A. H.", "" ] ]
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711.235
Joel Hass
Joel Hass and Tahl Nowik
Unknot diagrams requiring a quadratic number of Reidemeister moves to untangle
null
null
null
null
math.GT
null
We present a sequence of diagrams of the unknot for which the minimum number of Reidemeister moves required to pass to the trivial diagram is quadratic with respect to the number of crossings. These bounds apply both in $S^2$ and in $\R^2$.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 06:58:57 GMT" } ]
2007-11-16T00:00:00
[ [ "Hass", "Joel", "" ], [ "Nowik", "Tahl", "" ] ]
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711.2351
Dan Butnariu
Dan Butnariu, Gabor Kassay
A Proximal-Projection Method for Finding Zeros of Set-Valued Operators
38 pages
null
null
null
nlin.SI
null
In this paper we study the convergence of an iterative algorithm for finding zeros with constraints for not necessarily monotone set-valued operators in a reflexive Banach space. This algorithm, which we call the proximal-projection method is, essentially, a fixed point procedure and our convergence results are based on new generalizations of Lemma Opial. We show how the proximal-projection method can be applied for solving ill-posed variational inequalities and convex optimization problems with data given or computable by approximations only. The convergence properties of the proximal-projection method we establish also allow us to prove that the proximal point method (with Bregman distances), whose convergence was known to happen for maximal monotone operators, still converges when the operator involved in it is monotone with sequentially weakly closed graph.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 07:18:11 GMT" } ]
2007-11-16T00:00:00
[ [ "Butnariu", "Dan", "" ], [ "Kassay", "Gabor", "" ] ]
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711.2352
Carey Lisse
Carey Lisse, Mark Sykes, David Trilling, Josh Emery, Yanga Fernandez, Heidi Hammel, Bidushi Bhattacharya, Erin Ryan, John Stansberry
Planetary Science Goals for the Spitzer Warm Era
29 pages, 17 figures, to appear in "Science Opportunities for the Warm Spitzer Mission"
null
10.1063/1.2806779
null
astro-ph
null
The overarching goal of planetary astronomy is to deduce how the present collection of objects found in our Solar System were formed from the original material present in the proto-solar nebula. As over two hundred exo-planetary systems are now known, and multitudes more are expected, the Solar System represents the closest and best system which we can study, and the only one in which we can clearly resolve individual bodies other than planets. In this White Paper we demonstrate how to use Spitzer Space Telescope InfraRed Array Camera Channels 1 and 2 (3.6 and 4.5 um) imaging photometry with large dedicated surveys to advance our knowledge of Solar System formation and evolution. There are a number of vital, key projects to be pursued using dedicated large programs that have not been pursued during the five years of Spitzer cold operations. We present a number of the largest and most important projects here; more will certainly be proposed once the warm era has begun, including important observations of newly discovered objects.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 07:28:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Lisse", "Carey", "" ], [ "Sykes", "Mark", "" ], [ "Trilling", "David", "" ], [ "Emery", "Josh", "" ], [ "Fernandez", "Yanga", "" ], [ "Hammel", "Heidi", "" ], [ "Bhattacharya", "Bidushi", "" ], [ "Ryan", "Erin", "" ], [ "Stansberry", "John", "" ] ]
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711.2353
Bhola Dwivedi
K.A.P. Singh, R. Erdelyi, and B.N. Dwivedi
Effect of the steady flow on spatial damping of small-amplitude prominence oscillations
17 pages; 6 figures, Submitted in A&A
null
null
null
astro-ph
null
Aims. Taking account of steady flow in solar prominences, we study its effects on spatial damping of small-amplitude non-adiabatic magnetoacoustic waves in a homogeneous, isothermal, and unbounded prominence plasma. Methods. We model the typical feature of observed damped oscillatory motion in prominences, removing the adiabaticity assumption through thermal conduction, radiation and heating. Invoking steady flow in MHD equations, we linearise them under small-amplitude approximation and obtain a new general dispersion relation for linear non-adiabatic magnetoacoustic waves in prominences Results. The presence of steady flow breaks the symmetry of forward and backward propagating MHD wave modes in prominences. The steady flow has dramatic influence on the propagation and damping of magnetoacoustic and thermal waves. Depending upon the direction and strength of flow the magnetoacoustic and thermal modes can show both the features of wave amplification and damping. At the wave period of 5 min where the photospheric power is maximum, the slow mode shows wave amplification. However, in the absence of steady flow the slow mode wave shows damping. Conclusions. For the wave period between 5 min and 15 min, the amplification length for slow mode, in the case of prominence regime 1.1, varies between 3.4*10^11 m to 2*10^12 m. Dramatic influence of steady flow on small-amplitude prominence oscillations is likely to play an important role in both wave detection and prominence seismology.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 07:51:54 GMT" } ]
2007-11-16T00:00:00
[ [ "Singh", "K. A. P.", "" ], [ "Erdelyi", "R.", "" ], [ "Dwivedi", "B. N.", "" ] ]
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711.2354
Svetlana Roudenko
Lars Diening, Peter H\"ast\"o and Svetlana Roudenko
Function spaces of variable smoothness and integrability
null
null
null
null
math.CA
null
In this article we introduce Triebel--Lizorkin spaces with variable smoothness and integrability. Our new scale covers spaces with variable exponent as well as spaces of variable smoothness that have been studied in recent years. Vector-valued maximal inequalities do not work in the generality which we pursue, and an alternate approach is thus developed. Applying it, we give molecular and atomic decomposition results and show that our space is well-defined, i.e., independent of the choice of basis functions. As in the classical case, a unified scale of spaces permits clearer results in cases where smoothness and integrability interact, such as Sobolev embedding and trace theorems. As an application of our decomposition, we prove optimal trace theorems in the variable indices case.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 07:59:57 GMT" } ]
2007-11-16T00:00:00
[ [ "Diening", "Lars", "" ], [ "Hästö", "Peter", "" ], [ "Roudenko", "Svetlana", "" ] ]
[ 0.0103622656, 0.0214208104, 0.0703378022, -0.0107377097, -0.0083963023, 0.0021434461, 0.0228816289, -0.0106557943, -0.0645491332, 0.0820243657, 0.002831192, -0.0526714362, -0.0071675749, -0.0363976285, 0.0645491332, 0.0958953276, 0.0121439202, -0.0105738798, 0.0550469756, 0.0426231772, 0.0064576436, -0.0784200951, -0.0068194354, 0.0051504145, -0.0418859422, -0.0360153578, 0.0529171824, 0.0858470723, 0.1171932593, -0.007399668, 0.0310458392, -0.0728498697, -0.0128948083, -0.026963735, -0.091362685, 0.0887414068, 0.0817513093, 0.1522529423, 0.0212979373, 0.0774371177, -0.0421862975, 0.154983446, -0.0845364258, 0.0607264265, 0.0599618852, -0.0031861577, 0.0409848765, -0.0288341306, 0.0023635931, -0.0022168285, -0.1251663417, 0.0571767688, 0.0636753738, -0.1266954243, -0.0088946195, 0.0849187002, -0.0339947827, 0.0083963023, 0.0443707034, -0.0685902759, 0.0050377813, -0.0587058514, -0.0089970129, 0.0102393925, -0.0957861096, 0.0311550591, -0.0908165872, 0.0692455992, 0.0967144743, -0.004146954, -0.0133180367, -0.0081983404, 0.0391008295, 0.1028854176, -0.0070447023, -0.0196323283, -0.0863931701, 0.1550926715, -0.0862293392, -0.0019506043, 0.0361245759, -0.0018413841, 0.0665150955, 0.0747612193, -0.0686995015, -0.051224269, -0.0065293196, -0.0222945716, -0.0791300237, -0.0524803028, -0.0154546564, 0.0045087459, 0.0239601787, 0.0541459098, 0.1341223866, -0.0723037645, 0.1133705527, -0.0422682129, -0.0294894502, -0.0120551782, -0.0906527564, -0.0081846882, 0.0791300237, -0.0228679776, 0.1484302431, 0.0160280634, 0.0157277081, -0.0294075366, -0.0869938806, 0.0172977466, -0.0954038352, 0.0237280857, -0.0194002353, 0.0112496791, 0.0262264982, -0.1405663788, -0.0273323525, 0.002109315, -0.1456997395, 0.0507873893, -0.0161372833, -0.0313735008, 0.1132613346, 0.0823520198, 0.039291963, -0.0892875046, -0.0174615774, -0.0282334182, -0.134013176, 0.0289160442, 0.0237280857, 0.0115363821, 0.0216392502, -0.0298171118, -0.1058889702, 0.0525895208, -0.0239328742, 0.0532994531, 0.1055067033, -0.025066033, 0.0429781452, 0.0412579253, 0.0871030986, 0.0088877929, -0.0550469756, -0.0137344385, -0.012130267, 0.0960591584, -0.030117467, 0.0195777193, -0.0797307417, 0.0105738798, 0.0655321106, 0.0507054739, -0.0701193586, -0.0748704374, 0.0263493713, 0.0613817461, 0.0780378282, -0.0027748754, 0.0820243657, 0.1139166579, -0.0569583289, -0.0424593501, 0.0717576668, 0.0484664589, 0.0086010899, 0.0579959191, -0.0875399783, -0.0080891205, -0.0151269957, -0.0869938806, -0.0453263782, 0.0208883621, 0.0853009671, 0.0164649431, 0.0012730978, -0.1041960642, -0.0333394632, -0.0523164719, -0.0222672652, 0.1436245441, -0.0141576668, -0.0318649895, -0.0443707034, 0.0154273519, -0.0960591584, -0.0534086712, 0.0860108957, 0.0954038352, -0.075908035, 0.0732867494, 0.0682626218, 0.1743154228, 0.0761264712, -0.0903797075, 0.0514973179, 0.0646037385, 0.0071061384, -0.02547561, 0.0595796145, -0.0165332053, 0.0361245759, 0.0076249344, -0.0930555984, 0.0859016776, 0.0097956853, 0.1079641581, -0.0879768655, -0.0093383258, -0.0282334182, -0.0582689717, -0.0140347946, -0.0103076557, 0.0028789758, 0.1035407409, 0.0067477599, 0.072795257, 0.1143535376, 0.1438429952, -0.024151314, 0.0453809872, 0.0537090264, -0.0169427823, 0.0456813425, -0.0380359292, 0.0400018953, -0.1378358752, 0.0292710103, 0.0316192433, 0.0447802767, -0.0207927935, -0.0354965627, -0.0146082006, -0.000090448, 0.0206153113, 0.0192910153, -0.048985254, -0.0183080342, -0.1084556505, -0.0723037645, 0.0569583289, 0.0158505794, 0.003247594, -0.0070310496, 0.0345135815, -0.0608902536, 0.017898459, -0.0449441075, -0.0430600606, -0.010068736, 0.0205743536, 0.0472104251, -0.035796918, -0.0483299345, 0.0411760099 ]
711.2355
Selcuk Bilir
S. Karaali, S. Bilir, E. Yaz, E. Hamzaoglu, R. Buser
Volume limited dependent Galactic model parameters
12 pages, including 8 figures and 5 tables, accepted for publication in PASA
null
10.1071/AS07006
null
astro-ph
null
We estimated 34 sets of Galactic model parameters for three intermediate latitude fields with Galactic longitudes l=60, l=90, and l=180, and we discussed their dependence on the volume. Also, we confirmed the variation of these parameters with absolute magnitude and Galactic longitude. The star samples in two fields are restricted with bright and unit absolute magnitude intervals, (4,5], and (5,6], whereas for the third field a larger absolute magnitude interval is adopted, (4,10]. The limiting apparent magnitudes of star samples are g=15 and g=22.5 mag which provide space densities within distances in the line of sight 0.9 and 25 kpc. The Galactic model parameters for the thin disc are not volume dependent. However, the ones for thick disc and halo do show spectacular trends in their variations with volume, except for the scalelength of the thick disc. The local space density of the thick disc increases, whereas the scaleheight of the same Galactic component decreases monotonically. However, both model parameters approach asymptotic values at large distances. The axial ratio of the halo increases abruptly for the volumes where thick disc is dominant, whereas it approaches an asymptotic value gradually for larger volumes, indicating a continuous transition from disclike structure to a spherical one at the outermost region of the Galaxy. The variation of the Galactic model parameters with absolute magnitude can be explained by their dependence on the stellar luminosity, whereas the variation with volume and Galactic longitude at short distances is a bias in analysis.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:02:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Karaali", "S.", "" ], [ "Bilir", "S.", "" ], [ "Yaz", "E.", "" ], [ "Hamzaoglu", "E.", "" ], [ "Buser", "R.", "" ] ]
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711.2356
Anna Lytova
J. L. Lebowitz, A. Lytova, L. Pastur
On a Random Matrix Models of Quantum Relaxation
21 pages
null
null
null
math-ph math.MP
null
Earlier two of us (J.L. and L.P.) considered a matrix model for a two-level system interacting with a $n\times n$ reservoir and assuming that the interaction is modelled by a random matrix. We presented there a formula for the reduced density matrix in the limit $n\to \infty $ as well as several its properties and asymptotic forms in various regimes. In this paper we give the proofs of the assertions, and present also a new fact about the model.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:03:37 GMT" } ]
2007-11-16T00:00:00
[ [ "Lebowitz", "J. L.", "" ], [ "Lytova", "A.", "" ], [ "Pastur", "L.", "" ] ]
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711.2357
Marcin Wie\'sniak
Marcin Wiesniak
Quantum Wire as Open System
New results, new references added, clearer plots
null
null
null
quant-ph
null
The faithful exchange of quantum information will soon become one of the challenges of the emerging quantum information technology. One of the possible solutions is to transfer a superposition through a chain of properly coupled spins. Such a system is called a quantum wire. We discuss the transfer in a quantum wire \cite{christ,niko1,niko2}, when the process of thermalization of the state takes place together with the free evolution. We investigate which encoding scheme is more faithful in certain thermal conditions.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:08:25 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 04:56:52 GMT" } ]
2008-05-02T00:00:00
[ [ "Wiesniak", "Marcin", "" ] ]
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711.2358
Mehdi Kargarian
M. Kargarian, R. Jafari, A. Langari
The renormalization of entanglement in the anisotropic Heisenberg (XXZ) model
9 pages, 7 figures
Phys. Rev. A 77, 032346 (2008)
10.1103/PhysRevA.77.032346
null
quant-ph
null
We have applied our recent approach (Kargarian, et.al Phys. Rev. A 76, 60304 (R) (2007)) to study the quantum information properties of the anisotropic s=1/2 Heisenberg chain. We have investigated the underlying quantum information properties like the evolution of concurrence, entanglement entropy, nonanalytic behaviours and the scaling close to the quantum critical point of the model. Both the concurrence and the entanglement entropy develop two saturated values after enough iterations of the renormalization of coupling constants. This values are associated with the two different phases, i.e Neel and spin liquid phases. The nonanalytic behaviour comes from the divergence of the first derivative of both measures of entanglement as the size of system becomes large. The renormalization scheme demonstrates how the minimum value of the first derivative and its position scales with an exponent of the system size. It is shown that this exponent is directly related to the critical properties of the model, i.e. the exponent governing the divergence of the correlation length close to the quantum critical point. We also use a renormalization method based on the quantum group concept in order to get more insight about the critical properties of the model and the renormalization of entanglement.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:13:55 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 06:32:30 GMT" }, { "version": "v3", "created": "Wed, 2 Apr 2008 21:14:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Kargarian", "M.", "" ], [ "Jafari", "R.", "" ], [ "Langari", "A.", "" ] ]
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711.2359
Javier Vijande Asenjo
J. Vijande, A. Valcarce, F. Fernandez
B meson spectroscopy
8 pages, 5 tables. Accepted for publication in Physical Review D
Phys.Rev.D77:017501,2008
10.1103/PhysRevD.77.017501
null
hep-ph hep-ex
null
We study the $B$ meson spectroscopy allowing the mixture of conventional $P$ wave quark-antiquark states and four-quark components. A similar picture was used to describe the new $D_J$ and $D_{sJ}$ open charm mesons. The four-quark components shift the masses of some positive parity $B_{sJ}$ states below their corresponding isospin preserving two-meson threshold and therefore they are expected to be narrow. Electromagnetic decay widths are analyzed.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:15:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Vijande", "J.", "" ], [ "Valcarce", "A.", "" ], [ "Fernandez", "F.", "" ] ]
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711.236
Etienne Birmel\'e
E. Birmel\'e
Every longest circuit of a 3-connected, $K_{3,3}$-minor free graph has a chord
accepted by Journal of Graph Theory
Journal of Graph Theory, 58 (4): 293-298, 2008
10.1002/jgt.20312
null
math.CO
null
Carsten Thomassen conjectured that every longest circuit in a 3-connected graph has a chord. We prove the conjecture for graphs having no $K_{3,3}$ minor, and consequently for planar graphs.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:23:49 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 14:12:03 GMT" } ]
2011-09-07T00:00:00
[ [ "Birmelé", "E.", "" ] ]
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711.2361
Rashid Nazmitdinov
R.G. Nazmitdinov, J. Kvasil, and A. Tsvetkov
Reflection symmetry instability at high spins in 162,164Yb
6 pages, 7 figures
Phys.Lett.B657:159-164,2007
10.1016/j.physletb.2007.10.004
null
nucl-th nucl-ex
null
A shape evolution of 162,164Yb in yrast states is traced using the self-consistent Skyrme Hartree-Fock calculations. We found that nonaxial octupole deformations (in particular, Y_{31} term) become favorable at large rotational frequencies (> 0.4 MeV) in 162Yb, while in 164Yb a nonaxial quadrupole shape is dominant at fast rotation. The cranked Nilsson model and random phase approximation are used to understand the dynamics of octupole correlations in both nuclei. We demonstrate that the disappearance of one of the octupole vibrational modes in the rotating frame gives rise to the nonaxial octupole deformations in 162Yb, while the octupole modes are nonzero in 164Yb.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:38:12 GMT" } ]
2010-11-05T00:00:00
[ [ "Nazmitdinov", "R. G.", "" ], [ "Kvasil", "J.", "" ], [ "Tsvetkov", "A.", "" ] ]
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711.2362
Zhongmu Li
Zhongmu Li, Zhanwen Han
How binary interactions affect spectral stellar population synthesis
28 pages, 13 figures, Accepted for publication in ApJ
null
10.1086/590228
null
astro-ph
null
Single-star stellar population (ssSSP) models are usually used for stellar population studies. However, more than 50% of stars are in binaries and evolve differently from single stars. This suggests that the effects of binary interactions should be considered when modeling the stellar populations of galaxies and star clusters. Via a rapid spectral stellar population synthesis (RPS) model, we give detailed studies of the effects of binary interactions on the Lick indices and colours of stellar populations, and on the determination of the stellar ages and metallicities of populations. The results show that binary interactions make stellar populations less luminous, bluer, with larger age-sensitive Lick index (Hbeta) and less metallicity-sensitive indices (e.g., Mgb, Fe5270 and Fe5335) compared to ssSSPs. It also shows that when ssSSP models are used to determine the ages and metallicities of stellar populations, lower ages or metallicities will be obtained, taking two line indices (Hbeta and [MgFe]) and two colours (e.g., u-R and R-K), respectively. Some relations for linking the stellar-population parameters obtained by ssSSPs to those obtained by binary-star stellar populations (bsSSPs) are presented in the work. This can help us to get some absolute values for stellar-population parameters and is useful for absolute studies. However, it is found that the relative luminosity-weighted stellar ages and metallicities obtained via ssSSPs and bsSSPs are similar. This suggests that ssSSPs can be used for most stellar population studies, except in some special cases.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 08:47:56 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 01:02:20 GMT" }, { "version": "v3", "created": "Tue, 20 May 2008 07:25:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Zhongmu", "" ], [ "Han", "Zhanwen", "" ] ]
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711.2363
Gajendra Pandey
Gajendra Pandey (1), David L. Lambert (2), N. Kameswara Rao (1) ((1) Indian Institute of Astrophysics, Bangalore, India, (2) The W.J. McDonald Observatory, University of Texas at Austin, TX, USA)
Fluorine in R Coronae Borealis Stars
25 pages, 7 figures, accepted to ApJ
null
10.1086/526492
null
astro-ph
null
Neutral fluorine (F I) lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine is enriched in some RCBs by factors of 800 to 8000 relative to its likely initial abundance. The overabundances of fluorine are evidence for the synthesis of fluorine. These results are discussed in the light of the scenario that RCBs are formed by accretion of an He white dwarf by a C-O white dwarf. Sakurai's object (V4334 Sgr), a final He-shell flash product, shows no detectable F I lines.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 09:00:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Pandey", "Gajendra", "" ], [ "Lambert", "David L.", "" ], [ "Rao", "N. Kameswara", "" ] ]
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711.2364
Kenji Fukushima
Kenji Fukushima
Randomness in infinitesimal extent in the McLerran-Venugopalan model
11 pages, 11 figures, typos corrected; Introduction and Discussion sections extended
Phys.Rev.D77:074005,2008
10.1103/PhysRevD.77.074005
YITP-07-79
hep-ph
null
We study discrepancy between the analytical definition and the numerical implementation of the McLerran-Venugopalan (MV) model. The infinitesimal extent of a fast-moving nucleus should retain longitudinal randomness in the color source distribution even when the longitudinal extent approximates zero due to the Lorentz contraction, which is properly taken into account in the analytical treatment. We point out that the longitudinal randomness is lost in numerical simulations because of lack of the path-ordering of the Wilson line along the longitudinal direction. We quantitatively investigate how much the results with and without longitudinal randomness differ from each other. We finally mention that the discrepancy could be absorbed in a choice of the model parameter in the physical unit, and nevertheless, it is important for a full theory approach.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:15:08 GMT" }, { "version": "v2", "created": "Sun, 20 Jan 2008 15:00:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Fukushima", "Kenji", "" ] ]
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711.2365
Otmar Stahl
O. Stahl, S. Casassus, T.L. Wilson
Interstellar 12C/13C from CH+ absorption lines: Results from an extended survey
11 pages, 16 figures, 2 tables, A&A submitted
null
10.1051/0004-6361:20078747
null
astro-ph
null
The 12C/13C isotope ratio in the interstellar medium (ISM), and its evolution with time, is an important tracer of stellar yields. Spatial variations of this ratio can be used to study mixing in the ISM. We want to determine this ratio and its spatial variations in the local ISM from CH+ absorption lines in the optical towards early-type stars. The aim is to determine the average value for the local ISM and study possible spatial variations. We observed a large number of early-type stars with Feros to extend the sample of suitable target stars for CH+ isotope studies. The best suited targets were observed with Uves with higher signal-to-noise ratio and spectral resolution to determine the isotope ratio from the interstellar CH+ lines. This study significantly expands the number of 13CH+ detections. We find an average ratio of <R> = 76.27 +- 1.94 or, for f = 1/R, <f> = (120.46 +- 3.02) 10^{-4}. The scatter in f is 6.3 sigma(<f>). This findings strengthens the case for chemical inhomogeneity in the local ISM, with important implications for the mixing in the ISM. Given the large scatter, the present-day value in the ISM is not significantly larger than the solar value, which corresponds to the local value 4.5 Gyr ago.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 09:20:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Stahl", "O.", "" ], [ "Casassus", "S.", "" ], [ "Wilson", "T. L.", "" ] ]
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711.2366
Isabel M. C. Salavessa
Guanghan Li, Isabel Salavessa
Forced Convex Mean Curvature Flow in Euclidean Spaces
22 Pages
Manuscripta Math. 126 (2008) 333 - 351
10.1007/s00229-008-0181-z
null
math.DG math.AP
null
In this paper, we consider the mean curvature flow of convex hypersurfaces in Euclidean spaces with a general forcing term. We show that the flow may shrink to a point in finite time if the forcing term is small, or exist for all times and expand to infinity if the forcing term is large enough. The flow can also converge to a round sphere for some special forcing term and initial hypersurface. Furthermore, the normalization of the flow is carried out so that long time existence and convergence of the rescaled flow are studied. Our work extends Huisken's well-known mean curvature flow and McCoy's mixed volume preserving mean curvature flow.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 09:18:53 GMT" } ]
2008-06-17T00:00:00
[ [ "Li", "Guanghan", "" ], [ "Salavessa", "Isabel", "" ] ]
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711.2367
Slavko Bogdanov
Slavko Bogdanov, Jonathan E. Grindlay (Harvard)
An X-ray View of Radio Millisecond Pulsars
5 pages, 5 figures, To appear in the proceedings of "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007, McGill University, Montreal, Canada
AIPConf.Proc.983:64-68,2008
10.1063/1.2900321
null
astro-ph
null
In recent years, X-ray observations with Chandra and XMM-Newton have significantly increased our understanding of rotation-powered (radio) millisecond pulsars (MSPs). Deep Chandra studies of several globular clusters have detected X-ray counterparts to a host of MSPs, including 19 in 47 Tuc alone. These surveys have revealed that most MSPs exhibit thermal emission from their heated magnetic polar caps. Realistic models of this thermal X-ray emission have provided important insight into the basic physics of pulsars and neutron stars. In addition, intrabinary shock X-ray radiation observed in ``black-widow'' and peculiar globular cluster ``exchanged'' binary MSPs give interesting insight into MSP winds and relativistic shock. Thus, the X-ray band contains valuable information regarding the basic properties of MSPs that are not accesible by radio timing observations.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:37:13 GMT" } ]
2008-11-26T00:00:00
[ [ "Bogdanov", "Slavko", "", "Harvard" ], [ "Grindlay", "Jonathan E.", "", "Harvard" ] ]
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711.2368
Alexander Zaitsev
Alexander Zaitsev
Sending and Searching for Interstellar Messages
6 pages, 3 figures, to appear in the proceedings of "International Asronautical Congress 2007", Hyderbad, India
null
10.1016/j.actaastro.2008.05.014
null
physics.pop-ph
null
There is a close interrelation between Searching for Extraterrestrial Intelligence (SETI) and Messaging to Extraterrestrial Intelligence (METI). For example, the answers to the questions "Where to search" and "Where to send" are equivalent, in that both require an identical selection from the same target star lists. Similar considerations lead to a strategy of time synchronization between sending and searching. Both SETI and METI use large reflectors. The concept of "magic frequencies" may be applicable to both SETI and METI. Efforts to understand an alien civilization's Interstellar Messages (IMs), and efforts to compose our own IMs so they will be easily understood by unfamiliar Extraterrestrials, are mutually complementary. Furthermore, the METI-question: "How can we benefit from sending IMs, if a response may come only thousands of years later?" begs an equivalent SETI-question: "How can we benefit from searching, if it is impossible now to perceive the motivations and feelings of those who may have sent messages in the distant past?" A joint consideration of the theoretical and the practical aspects of both sending and searching for IMs, in the framework of a unified, disciplined scientific approach, can be quite fruitful. We seek to resolve the cultural disconnect between those who advocate sending interstellar messages, and others who anathematize those who would transmit.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:46:32 GMT" } ]
2015-05-13T00:00:00
[ [ "Zaitsev", "Alexander", "" ] ]
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711.2369
Moulin Emmanuel
HESS Collaboration: F. Aharonian, et al
Observations of the Sagittarius Dwarf galaxy by the H.E.S.S. experiment and search for a Dark Matter signal
21 pages, 4 figures, 2 tables; Accepted for publication in Astroparticle Physics
Astropart.Phys.29:55-62,2008; Erratum-ibid.33:274-275,2010
10.1016/j.astropartphys.2007.11.007 10.1016/j.astropartphys.2010.01.007
null
astro-ph
null
Observations of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy were carried out with the H.E.S.S. array of four imaging air Cherenkov telescopes in June 2006. A total of 11 hours of high quality data are available after data selection. There is no evidence for a very high energy gamma-ray signal above the energy threshold at the target position. A 95% C.L. flux limit of 3.6 x 10-12 cm-2s-1 above 250 GeV has been derived. Constraints on the velocity-weighted cross section <sigma v> are calculated in the framework of Dark Matter particle annihilation using realistic models for the Dark Matter halo profile of Sagittarius dwarf galaxy. Two different models have been investigated encompassing a large class of halo types. A 95% C.L. exclusion limit on <sigma v> of the order of 2 x 10-25 cm3s-1 is obtained for a core profile in the 100 GeV - 1 TeV neutralino mass range.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:16:38 GMT" } ]
2010-04-22T00:00:00
[ [ "HESS Collaboration", "", "" ], [ "Aharonian", "F.", "" ] ]
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711.237
Ryutin Roman
V. A. Petrov and R. A. Ryutin (IHEP, Serpukhov, Russia)
Patterns of the Exclusive Double Diffraction
12 pages, 7 figures, to be published
J.Phys.G35:065004,2008
10.1088/0954-3899/35/6/065004
null
hep-ph
null
We consider Exclusive Double Diffractive Events (EDDE) as a powerfull tool to study the picture of the $pp$ interaction. Calculations of the cross-sections for the process $p+p\to p+M+p$ are presented in the convenient form for further experimental applications. We propose measurements of t-distributions in the joint CMS-TOTEM experiment. It is shown that important information on the interaction region could be extracted from the diffractive pattern.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:20:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Petrov", "V. A.", "", "IHEP, Serpukhov, Russia" ], [ "Ryutin", "R. A.", "", "IHEP, Serpukhov, Russia" ] ]
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711.2371
Shoulan Gao
Shoulan Gao, Cuipo Jiang
Representations for the non-graded Virasoro-like algebra
29 pages;
null
null
null
math.RT math.RA
null
It is proved that an irreducible module over the non-graded Virasoro-like algebra, which satisfies a natural condition, is a GHW module or uniformly bounded. Furthermore, the classification of some uniformly bounded modules is given.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:38:49 GMT" } ]
2007-11-16T00:00:00
[ [ "Gao", "Shoulan", "" ], [ "Jiang", "Cuipo", "" ] ]
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711.2372
Luis Paris
Luis Paris
Braid groups and Artin groups
null
In: Handbook on Teichm\"uller theory (A. Papadopoulos, ed.), Volume II, EMS Publishing House, Z\"urich 2008
null
null
math.GR math.GT
null
This article is a survey on the braid groups, the Artin groups, and the Garside groups. It is a presentation, accessible to non-experts, of various topological and algebraic aspects of these groups. It is also a report on three points of the theory: the faithful linear representations, the cohomology, and the geometrical representations.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:42:13 GMT" } ]
2007-11-16T00:00:00
[ [ "Paris", "Luis", "" ] ]
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711.2373
Stanislav Volkov
Mikhail Menshikov, Stanislav Volkov
Urn-related random walk with drift $\rho x^{\alpha} / t^{\beta}$
23 pages
null
null
null
math.PR
null
We study a one-dimensional random walk whose expected drift depends both on time and the position of a particle. We establish a non-trivial phase transition for the recurrence vs. transience of the walk, and show some interesting applications to Friedman's urn, as well as showing the connection with Lamperti's walk with asymptotically zero drift.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:51:38 GMT" } ]
2007-11-16T00:00:00
[ [ "Menshikov", "Mikhail", "" ], [ "Volkov", "Stanislav", "" ] ]
[ -0.0086857779, 0.03754244, -0.045417197, 0.0030560463, -0.0328594483, -0.1216008812, 0.0773348138, 0.0208903421, -0.0118186744, 0.0203016959, 0.0037019202, 0.0453125499, -0.0058897156, 0.029536875, 0.0008310517, 0.0981597528, -0.0391644835, 0.058602836, -0.0372546613, 0.0492106862, -0.1052234843, -0.0689106584, 0.0421731137, -0.1245310232, -0.0630503744, -0.0088558299, 0.0250631776, 0.0080251871, 0.0384319499, -0.1433676481, -0.0315251872, -0.0366529338, 0.0666083992, -0.083404392, -0.0167698301, 0.0914622843, -0.009575285, 0.0635736138, -0.0844508708, 0.0613760054, -0.0401063152, -0.1214962378, -0.0151739484, 0.0920378491, -0.0284903962, 0.0577656515, -0.0662421361, -0.052978009, 0.0594923422, 0.1450420171, -0.0412051193, -0.0620562173, -0.0324408561, -0.0339320898, -0.0391383208, -0.0221330356, 0.1008282751, 0.0506495945, 0.0499170572, -0.1022933424, 0.025756469, -0.1324842721, -0.0201054811, -0.1138569415, -0.0812591091, -0.0308449753, -0.1026072875, 0.073829107, 0.0237419978, 0.0330164209, -0.0062592537, -0.0832474232, 0.0218452532, 0.0271038115, 0.0511205085, 0.0544692427, -0.1181474999, -0.0753988251, -0.0960667878, 0.1761224568, 0.0214266609, -0.0338797644, 0.0238335636, 0.0102816578, -0.0223815739, -0.0611667112, 0.073358193, -0.1062176377, 0.002748643, -0.0575563572, -0.0442137457, -0.0087708039, -0.0012320657, 0.0965900347, 0.1045432761, -0.13101919, 0.1301820129, 0.0134210959, 0.0523762852, -0.0826195329, -0.0530564971, 0.0200400762, 0.1368794739, 0.0042545921, 0.0098107429, -0.0693815723, -0.0497339256, -0.0139181735, -0.1388677955, -0.0038883244, -0.0236111879, -0.0529518463, -0.0749279112, 0.0706373453, -0.0370976888, 0.0335396603, -0.0301124398, 0.0218452532, -0.0475101545, 0.0105890613, -0.0649863556, -0.0439259633, 0.0414144136, -0.0056084744, 0.0339059271, -0.0561959334, 0.0524286069, -0.0553064272, -0.0393214561, 0.0525332578, 0.0508588888, -0.0797417164, -0.0642014965, -0.024121346, -0.090939045, -0.095909819, 0.0446585007, 0.0526902266, 0.0105040353, -0.0328856073, 0.0740384012, 0.0218190923, -0.1319610327, 0.0180125237, 0.0181040894, 0.0439521261, -0.0356587805, 0.1507976502, 0.101299189, -0.0030282491, -0.0210734755, -0.0125119668, 0.0698001608, 0.0806835443, 0.051722236, -0.0267767869, 0.0952819288, 0.0537890308, -0.0123811569, -0.0466991365, -0.0086988583, 0.0443707183, -0.0948633403, -0.0852357298, 0.0005068884, -0.0277055372, -0.0651433319, 0.0271299742, -0.0188366249, 0.0006360632, -0.0235196203, -0.0403156132, -0.077544108, 0.0100658219, 0.0148076806, -0.0171884205, -0.0868054479, -0.0789568573, 0.0878519267, -0.065509595, -0.0098172827, 0.0272346213, 0.0057523656, -0.0290921219, 0.0397923738, 0.0087577226, 0.0616376251, 0.0269991644, -0.0296676848, -0.0191636514, 0.0110534364, 0.2189234495, 0.0450247675, 0.0620038919, 0.0032931392, -0.092194818, 0.0584458634, -0.005987823, -0.0273654312, 0.0030985596, 0.0079924846, 0.0024559558, 0.0227609221, -0.029536875, -0.0173715558, 0.0038458111, 0.0292490944, 0.0870670676, -0.025246311, 0.0236242674, 0.0427486748, -0.1270425767, 0.070898965, -0.0719454437, 0.0058439323, -0.0069394652, -0.0459142737, 0.0490013883, 0.0425393805, 0.0816253796, -0.0498647355, 0.0254294444, 0.056666851, -0.0144414129, 0.0442922339, 0.0354756452, 0.1374027133, -0.0964330584, 0.0341937095, 0.0733058676, 0.0056575281, 0.064253822, -0.0840322822, -0.0206548832, 0.0023480377, -0.0547831878, -0.082148619, -0.0572947375, -0.0081363758, -0.0462020561, -0.1374027133, -0.0070310323, -0.0790615007, -0.0455218442, -0.02259087, 0.0506757572, -0.0769685432, -0.0341675468, 0.069172278, -0.0554110743, -0.0671316385, -0.0663991049, 0.0121849421, 0.0330164209, 0.01533092, 0.0501786768 ]
711.2374
Alexander Chernyatiev
A.Ya. Belov, A.L.Chernyat'ev
Describing the set of words generated by interval exchange transformation
17 pages, this paper was submitted at scientific council of MSU, date: September 21, 2007
Comm. in Algebra, 2010, 38, N. 7, 2588--2605
10.1080/00927870903032932
VINITI 1048-B2007
math.DS math.CO
null
Let $W$ be an infinite word over finite alphabet $A$. We get combinatorial criteria of existence of interval exchange transformations that generate the word W.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:54:42 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 15:52:48 GMT" } ]
2017-11-30T00:00:00
[ [ "Belov", "A. Ya.", "" ], [ "Chernyat'ev", "A. L.", "" ] ]
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711.2375
Roee Teper
Roee Teper
The induced capacity and Choquet integral monotone convergece
null
null
null
null
math.CA
null
Given a probability measure over a state space, a partial collection (sub-$\sigma$-algebra) of events whose probabilities are known, induces a capacity over the collection of all possible events. The \emph{induced capacity} of an event $F$ is the probability of the maximal (with respect to inclusion) event contained in $F$ whose probability is known. The Choquet integral with respect to the induced capacity coincides with the integral with respect to a \emph{probability specified on a sub-algebra} (Lehrer \cite{Lehrer2}). We study Choquet integral monotone convergence and apply the results to the integral with respect to the induced capacity. The paper characterizes the properties of sub-$\sigma$-algebras and of induced capacities which yield integral monotone convergence.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:59:26 GMT" } ]
2007-11-16T00:00:00
[ [ "Teper", "Roee", "" ] ]
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711.2376
Marian Lazar
M. Lazar, P.K. Shukla, and A. Smolyakov
Surface waves on a quantum plasma half-space
null
submmitted to Physics of Plasmas on October 22, 2007
10.1063/1.2825278
null
physics.plasm-ph physics.gen-ph
null
Surface modes are coupled electromagnetic/electrostatic excitations of free electrons near the vacuum-plasma interface and can be excited on a sufficiently dense plasma half-space. They propagate along the surface plane and decay in either sides of the boundary. In such dense plasma models, which are of interest in electronic signal transmission or in some astrophysical applications, the dynamics of the electrons is certainly affected by the quantum effects. Thus, the dispersion relation for the surface wave on a quantum electron plasma half-space is derived by employing the quantum hydrodynamical (QHD) and Maxwell-Poison equations. The QHD include quantum forces involving the Fermi electron temperature and the quantum Bohm potential. It is found that, at room temperature, the quantum effects are mainly relevant for the electrostatic surface plasma waves in a dense gold metallic plasma.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:14:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Lazar", "M.", "" ], [ "Shukla", "P. K.", "" ], [ "Smolyakov", "A.", "" ] ]
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711.2377
Masaki Kobayashi
M. Kobayashi, Y. Ooki, M. Takizawa, G. S. Song, A. Fujimori, Y. Takeda, K. Terai, T. Okane, S.-I. Fujimori, Y. Saitoh, H. Yamagami, M. Seki, T. Kawai, H. Tabata
Photoemission and x-ray absorption studies of valence states in (Ni,Zn,Fe,Ti)$_{3}$O$_{4}$ thin films exhibiting photo-induced magnetization
4 pages, 4 figures
Appl. Phys. Lett. 92, 082502 (2008)
10.1063/1.2885080
null
cond-mat.mtrl-sci cond-mat.str-el
null
By means of photoemission and x-ray absorption spectroscopy, we have studied the electronic structure of (Ni,Zn,Fe,Ti)$_{3}$O$_{4}$ thin films, which exhibits a cluster glass behavior with a spin-freezing temperature $T_f$ of $\sim 230$ K and photo-induced magnetization (PIM) below $T_f$. The Ni and Zn ions were found to be in the divalent states. Most of the Fe and Ti ions in the thin films were trivalent (Fe$^{3+}$) and tetravalent (Ti$^{4+}$), respectively. While Ti doping did not affect the valence states of the Ni and Zn ions, a small amount of Fe$^{2+}$ ions increased with Ti concentration, consistent with the proposed charge-transfer mechanism of PIM.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:49:59 GMT" } ]
2008-04-21T00:00:00
[ [ "Kobayashi", "M.", "" ], [ "Ooki", "Y.", "" ], [ "Takizawa", "M.", "" ], [ "Song", "G. S.", "" ], [ "Fujimori", "A.", "" ], [ "Takeda", "Y.", "" ], [ "Terai", "K.", "" ], [ "Okane", "T.", "" ], [ "Fujimori", "S. -I.", "" ], [ "Saitoh", "Y.", "" ], [ "Yamagami", "H.", "" ], [ "Seki", "M.", "" ], [ "Kawai", "T.", "" ], [ "Tabata", "H.", "" ] ]
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711.2378
Sudhir Vempati
Ranjan Laha and Sudhir K. Vempati
Results from MiniBooNE
16 pages; Added comments and references. Accepted for publication in Current Science
Curr.Sci.94:211-217,2008
null
IISc/CHEP/13/07
physics.pop-ph hep-ex hep-ph
null
The long awaited experimental results from MiniBooNE have recently been announced. This experiment tests whether neutrino oscillations can occur at a higher mass squared difference $\sim1 {eV}^2$ compared to well established observations of solar and atmospheric neutrinos. The LSND experiment has previously claimed to have observed neutrino oscillations at $\Delta m^2 \sim 1 {eV}^2$, however the results being controversial, required an independent confirmation. The MiniBooNE results settle this controversy by observing null oscillations at the said mass squared difference. These results have strong implications on existence of sterile neutrinos, CPT violation and mass varying neutrinos. We review the present status of neutrino masses and mixing in the light of this recent result.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:22:23 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 11:56:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Laha", "Ranjan", "" ], [ "Vempati", "Sudhir K.", "" ] ]
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711.2379
Zhuo Li
Zhuo Li and Eli Waxman
Prompt optical emission from residual collisions in GRB outflows
5 pages, 1 fig, ApJL accepted version, minor changes-- add demonstration of gamma-ray emission radius, and comments on earlier work
ApJ 674 (2008) L65
10.1086/529042
null
astro-ph
null
The prompt gamma-ray emission in gamma-ray bursts is believed to be produced by internal shocks within a relativistic unsteady outflow. The recent detection of prompt optical emission accompanying the prompt gamma-ray emission appears to be inconsistent with this model since the out flowing plasma is expected to be highly optically thick to optical photons. We show here that fluctuations in flow properties on short, ~ 1 ms, time scale, which drive the gamma-ray producing collisions at small radii, are expected to lead to "residual" collisions at much larger radii, where the optical depth to optical photons is low. The late residual collisions naturally account for the relatively bright optical emission. The apparent simultaneity of gamma-ray and optical emission is due to the highly relativistic speed with which the plasma expands. Residual collisions may also account for the X-ray emission during the early "steep decline" phase, where the radius is inferred to be larger than the gamma-ray emission radius. Finally, we point out that inverse-Compton emission from residual collisions at large radii is expected to contribute significantly to the emission at high energy, and may therefore "smear" the pair production spectral cut-off.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:22:49 GMT" }, { "version": "v2", "created": "Thu, 15 Nov 2007 21:49:05 GMT" }, { "version": "v3", "created": "Thu, 3 Jan 2008 11:34:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Zhuo", "" ], [ "Waxman", "Eli", "" ] ]
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711.238
Pavel Kurakin
P. V. Kurakin
Hidden time interpretation of quantum mechanics and "no protocol" argument
8 pages, 7 figures. Reported at the International Symposium "Quantum Informatics - 2007", 1 - 5 Oct., Lipki, Russia. Discusses arguments raised at "Are superluminal signals an acceptable hypothesis? - Difficulties in building communication protocol with them", quant-ph/0610159
null
10.1117/12.801906
null
physics.gen-ph
null
Previously suggested hidden time interpretation of quantum mechanics allows to reproduce the same predictions as standard quantum mechanics provides, since it is based on Feynman many - paths formulation of QM. While new experimental consequences of this interpretation are under investigation, some advantages can be enumerated. (1) The interpretation is much field theoretic - like in classical sense, so it is local in mathematical sense, though quantum (physical) non-locality is preserved. (2) The interpretation is based on one type of mathematical objects, rather than two different (Hilbert space vectors and operators). (3) The interpretation, as it was argued, overcomes the problem of hidden variables in a radically new way, with no conflict to Bell's theorem. Recently an important argument against hidden variables - like formulations of quantum theory was risen - "no protocol" argument. It is argued in the paper, that hidden time interpretation successfully overcomes this argument.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:33:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Kurakin", "P. V.", "" ] ]
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711.2381
Fernando Casas
Fernando Casas
Sufficient conditions for the convergence of the Magnus expansion
20 pages
J. Phys. A: Math. Theor. 40 (2007), 15001-15017
10.1088/1751-8113/40/50/006
null
math.CA
null
Two different sufficient conditions are given for the convergence of the Magnus expansion arising in the study of the linear differential equation $Y' = A(t) Y$. The first one provides a bound on the convergence domain based on the norm of the operator $A(t)$. The second condition links the convergence of the expansion with the structure of the spectrum of $Y(t)$, thus yielding a more precise characterization. Several examples are proposed to illustrate the main issues involved and the information on the convergence domain provided by both conditions.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:34:47 GMT" } ]
2009-04-11T00:00:00
[ [ "Casas", "Fernando", "" ] ]
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711.2382
Nicolas Vergne
Nicolas Vergne (1) and Miguel Abadi (2) ((1) Laboratoire Statistique et G\'enome France, (2) Universidade de Campinas Brazil)
Poisson approximation for search of rare words in DNA sequences
29 pages, 0 figures
null
null
null
math.PR math.ST stat.AP stat.TH
null
Using recent results on the occurrence times of a string of symbols in a stochastic process with mixing properties, we present a new method for the search of rare words in biological sequences generally modelled by a Markov chain. We obtain a bound on the error between the distribution of the number of occurrences of a word in a sequence (under a Markov model) and its Poisson approximation. A global bound is already given by a Chen-Stein method. Our approach, the psi-mixing method, gives local bounds. Since we only need the error in the tails of distribution, the global uniform bound of Chen-Stein is too large and it is a better way to consider local bounds. We search for two thresholds on the number of occurrences from which we can regard the studied word as an over-represented or an under-represented one. A biological role is suggested for these over- or under-represented words. Our method gives such thresholds for a panel of words much broader than the Chen-Stein method. Comparing the methods, we observe a better accuracy for the psi-mixing method for the bound of the tails of distribution. We also present the software PANOW (available at http://stat.genopole.cnrs.fr/software/panowdir/) dedicated to the computation of the error term and the thresholds for a studied word.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:37:37 GMT" } ]
2007-11-16T00:00:00
[ [ "Vergne", "Nicolas", "" ], [ "Abadi", "Miguel", "" ] ]
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711.2383
Barbara Cerato
Barbara Cerato, Guido Masera and Emanuele Viterbo
Decoding the Golden Code: a VLSI design
25 pages, 10 figures
null
null
null
cs.AR
null
The recently proposed Golden code is an optimal space-time block code for 2 X 2 multiple-input multiple-output (MIMO) systems. The aim of this work is the design of a VLSI decoder for a MIMO system coded with the Golden code. The architecture is based on a rearrangement of the sphere decoding algorithm that achieves maximum-likelihood (ML) decoding performance. Compared to other approaces, the proposed solution exhibits an inherent flexibility in terms of modulation schemes QAM modulation size and this makes our architecture particularly suitable for adaptive modulation schemes.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:55:30 GMT" } ]
2007-11-16T00:00:00
[ [ "Cerato", "Barbara", "" ], [ "Masera", "Guido", "" ], [ "Viterbo", "Emanuele", "" ] ]
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711.2384
Andrea Tomadin
Andrea Tomadin, Marco Polini, M.P. Tosi, Rosario Fazio
Nonequilibrium pairing instability in ultracold Fermi gases with population imbalance
10 pages, 6 figures. High-quality figures can be requested to the authors
Phys. Rev. A 77, 033605 (2008)
10.1103/PhysRevA.77.033605
null
cond-mat.str-el cond-mat.supr-con
null
We present detailed numerical and analytical investigations of the nonequilibrium dynamics of spin-polarized ultracold Fermi gases following a sudden switching-on of the atom-atom pairing coupling strength. Within a time-dependent mean-field approach we show that on increasing the imbalance it takes longer for pairing to develop, the period of the nonlinear oscillations lengthens, and the maximum value of the pairing amplitude decreases. As expected, dynamical pairing is suppressed by the increase of the imbalance. Eventually, for a critical value of the imbalance the nonlinear oscillations do not even develop. Finally, we point out an interesting temperature-reentrant behavior of the exponent characterizing the initial instability.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:41:07 GMT" } ]
2008-03-06T00:00:00
[ [ "Tomadin", "Andrea", "" ], [ "Polini", "Marco", "" ], [ "Tosi", "M. P.", "" ], [ "Fazio", "Rosario", "" ] ]
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711.2385
Marian Lazar
M. Lazar
Fast magnetization in counterstreaming plasmas with temperature anisotropies
null
null
10.1016/j.physleta.2007.11.063
null
physics.plasm-ph physics.gen-ph
null
Counterstreaming plasmas exhibits an electromagnetic unstable mode of filamentation type, which is responsible for the magnetization of plasma system. It is shown that filamentation instability becomes significantly faster when plasma is hotter in the streaming direction. This is relevant for astrophysical sources, where strong magnetic fields are expected to exist and explain the nothermal emission observed.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 11:49:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Lazar", "M.", "" ] ]
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711.2386
Hajime Takami
Hajime Takami and Katsuhiko Sato
Distortion of Ultra-high-energy sky by Galactic Magnetic Field
9 pages, 6 figures, submitted to ApJ
Astrophys.J.681:1279-1287,2008
10.1086/588513
null
astro-ph
null
We investigate the deflections of UHE protons by Galactic magnetic field(GMF) using four conventional GMF models in order to discuss the positional correlation between the arrival distribution of UHECRs and their sources. UHE protons coming from the direction around the Galactic center are highly deflected above $8^{\circ}$ by the dipole magnetic field during their propagation in Galactic space. However, in bisymmetric spiral field models, there are directions with the deflection angle below $1^{\circ}$. One of these directions is toward Centaurus A, the nearest radio-loud active galactic nuclei that is one of possible candidates of UHECR sources. On the other hand, UHE protons arriving from the direction of the anti-Galactic center are less deflected, especially in bisymmetric spiral field models. Thus, the northern hemisphere, not including the Galactic center, is suitable for the studies of correlation with sources. The dependence on model parameters is also investigated. The deflection angles of UHE protons are dependent on the pitch angle of the spiral field. We also investigate distortion of the supergalactic plane by GMF. Since the distortion in the direction around Galactic center strongly depends on the GMF model, we can obtain information on GMF around Galactic center if Pierre Auger Observatory finds the significant positional correlation around the supergalactic plane.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:03:06 GMT" } ]
2009-02-10T00:00:00
[ [ "Takami", "Hajime", "" ], [ "Sato", "Katsuhiko", "" ] ]
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711.2387
Marek Karliner
Itay Hen and Marek Karliner
Hexagonal Structure of Baby Skyrmion Lattices
RevTeX, 7 pages, 6 figures
Phys.Rev.D77:054009,2008
10.1103/PhysRevD.77.054009
null
hep-th
null
We study the zero-temperature crystalline structure of baby Skyrmions by applying a full-field numerical minimization algorithm to baby Skyrmions placed inside different parallelogramic unit-cells and imposing periodic boundary conditions. We find that within this setup, the minimal energy is obtained for the hexagonal lattice, and that in the resulting configuration the Skyrmion splits into quarter-Skyrmions. In particular, we find that the energy in the hexagonal case is lower than the one obtained on the well-studied rectangular lattice, in which splitting into half-Skyrmions is observed.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:41:51 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 14:23:33 GMT" }, { "version": "v3", "created": "Wed, 16 Jan 2008 11:21:27 GMT" }, { "version": "v4", "created": "Mon, 28 Jan 2008 23:13:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Hen", "Itay", "" ], [ "Karliner", "Marek", "" ] ]
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711.2388
Sylvain Joubaud
Sylvain Joubaud (Phys-ENS), Nicolas Garnier (Phys-ENS), Sergio Ciliberto (Phys-ENS)
Fluctuations of the total entropy production in stochastic systems
6 p
null
10.1209/0295-5075/82/30007
null
cond-mat.stat-mech
null
Fluctuations of the excess heat in an out of equilibrium steady state are experimentally investigated in two stochastic systems : an electric circuit with an imposed mean current and a harmonic oscillator driven out of equilibrium by a periodic torque. In these two linear systems, we study excess heat that represents the difference between the dissipated heat out of equilibrium and the dissipated heat at equilibrium. Fluctuation theorem holds for the excess heat in the two experimental systems for all observation times and for all fluctuation magnitudes.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:13:19 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 13:48:36 GMT" }, { "version": "v3", "created": "Mon, 14 Jan 2008 11:26:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Joubaud", "Sylvain", "", "Phys-ENS" ], [ "Garnier", "Nicolas", "", "Phys-ENS" ], [ "Ciliberto", "Sergio", "", "Phys-ENS" ] ]
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711.2389
Rudra Prakash Malik
R. P. Malik (Bhu), B. P. Mandal (Bhu)
Superfield approach to symmetry invariance in QED with complex scalar fields
LaTeX file, 14 pages, minor changes in the title and text, version to appear in ``Pramana - Journal of Physics''
Pramana 72: 805-818, 2009
10.1007/s12043-009-0073-0
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the Grassmannian independence of the super Lagrangian density, expressed in terms of the superfields defined on a (4, 2)-dimensional supermanifold, is a clear-cut proof for the Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST invariance of the corresoponding four (3 + 1)-dimensional (4D) Lagrangian density that describes the interaction between the U(1) gauge field and the charged complex scalar fields. The above 4D field theoretical model is considered on a (4, 2)-dimensional supermanifold parametrized by the ordinary four spacetime variables x^\mu (with \mu = 0, 1, 2, 3) and a pair of Grassmannian variables \theta and \bar\theta (with \theta^2 = \bar\theta^2 = 0, \theta \bar\theta + \bar\theta \theta = 0). Geometrically, the (anti-)BRST invariance is encoded in the translation of the super Lagrangian density along the Grassmannian directions of the above supermanifold such that the outcome of this shift operation is zero.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:09:34 GMT" }, { "version": "v2", "created": "Thu, 19 Feb 2009 13:15:16 GMT" } ]
2015-05-13T00:00:00
[ [ "Malik", "R. P.", "", "Bhu" ], [ "Mandal", "B. P.", "", "Bhu" ] ]
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711.239
Alexander Silenko
Alexander J. Silenko
Potential for measurement of the tensor magnetic polarizability of the deuteron in storage ring experiments
Corrected text, 8 pages
Phys.Rev.C77:021001,2008
10.1103/PhysRevC.77.021001
null
nucl-th
null
General formulas describing deuteron spin dynamics in storage rings with allowance for the tensor electric and magnetic polarizabilities are derived. It is found that an initially tensor-polarized deuteron beam can acquire a final horizontal vector polarization of the order of 1%. This effect allows one to measure the tensor magnetic polarizability of the deuteron in storage ring experiments. We also confirm an existence of the effect found by Baryshevsky and Gurinovich, hep-ph/0506135 and Baryshevsky, hep-ph/0510158; hep-ph/0603191 that the tensor magnetic polarizability of the deuteron causes the spin rotation with two frequencies and experiences beating for polarized deuteron beams in storage rings.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:19:52 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 07:18:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Silenko", "Alexander J.", "" ] ]
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711.2391
Joao Lopes Dias
Joao Lopes Dias
Local conjugacy classes for analytic torus flows
inc bibl
null
null
null
math.DS
null
If a real-analytic flow on the multidimensional torus close enough to linear has a unique rotation vector which satisfies an arithmetical condition Y, then it is analytically conjugate to linear. We show this by proving that the orbit under renormalization of a constant Y vector field attracts all nearby orbits with the same rotation vector.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:34:00 GMT" } ]
2007-11-16T00:00:00
[ [ "Dias", "Joao Lopes", "" ] ]
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711.2392
Margit Haberreiter Dr.
Margit Haberreiter, Alexander G. Kosovichev, Werner Schmutz
Solving the discrepancy between the seismic and photospheric solar radius
submitted to ApJL
null
10.1086/529492
null
astro-ph
null
Two methods are used to observationally determine the solar radius: One is the observation of the intensity profile at the limb, the other one uses f-mode frequencies to derive a 'seismic' solar radius which is then corrected to optical depth unity. The two methods are inconsistent and lead to a difference in the solar radius of $\sim$0.3 Mm. Because of the geometrical extention of the solar photosphere and the increased path lengths of tangential rays the Sun appears to be larger to an observer who measures the extent of the solar disk. Based on radiative transfer calculations we show that this discrepancy can be explained by the difference between the height at disk center where $\tau_{\mathrm{5000}}=1$ ($\tau_{\mathrm{Ross}}=2/3$) and the inflection point of the intensity profile on the limb. We calculate the intensity profile of the limb for the MDI continuum and the continuum at 5000 {\AA} for two atmosphere structures and compare the position of the inflection points with the radius at $\tau_{\mathrm{5000}}=1$ ($\tau_{\mathrm{Ross}}=2/3$). The calculated difference between the 'seismic' radius and the inflection point is $0.347\pm 0.06$ Mm with respect to $\tau_{\mathrm{5000}}=1$ and $0.333\pm 0.08$ Mm with respect to $\tau_{\mathrm{Ross}}=2/3$. We conclude that the standard solar radius in evolutionary models has to be lowered by $0.333\pm 0.08$ Mm and is 695.66 Mm. Furthermore, this correction reconciles inflection point measurements and the 'seismic' radii within the uncertainty.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:10:09 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 09:47:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Haberreiter", "Margit", "" ], [ "Kosovichev", "Alexander G.", "" ], [ "Schmutz", "Werner", "" ] ]
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711.2393
Eduard Aschenbach
Bernd Aschenbach
Grazing Incidence Reflection and Scattering of MeV Protons
7 pages, 3 figures, updated version of a paper accepted for publication in the SPIE Conference Proceedings 6688, 2007
null
10.1117/12.735589
null
astro-ph
null
Treating protons as de Broglie waves shows that up to a few MeV energies protons experience total external reflection using the index of refraction concept for the target earlier applied to electrons. Angular scattering distributions can be explained by random surface scattering as known for X-rays. Applied to the {\it{Chandra}} and {\it{XMM-Newton}} X-ray telescopes the calculated reflection efficiencies can explain the observed degradation of the X-ray CCDs for both missions. Some discussion about the possibility of realizing imaging sub-MeV and MeV proton optics is presented.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:37:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Aschenbach", "Bernd", "" ] ]
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711.2394
Antonio Alarcon
Antonio Alarcon
Compact complete minimal immersions in R^3
16 pages. Main theorem improved. To appear in Trans. Amer. Math. Soc
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we find, for any arbitrary finite topological type, a compact Riemann surface $\mathcal{M},$ an open domain $M\subset\mathcal{M}$ with the fixed topological type, and a conformal complete minimal immersion $X:M\to\R^3$ which can be extended to a continuous map $X:\bar{M}\to\R^3,$ such that $X_{|\partial M}$ is an embedding and the Hausdorff dimension of $X(\partial M)$ is $1.$ We also prove that complete minimal surfaces are dense in the space of minimal surfaces spanning a finite set of closed curves in $\R^3$, endowed with the topology of the Hausdorff distance.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 12:43:17 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 17:02:56 GMT" }, { "version": "v3", "created": "Mon, 28 Jan 2008 11:26:10 GMT" }, { "version": "v4", "created": "Tue, 10 Feb 2009 15:55:20 GMT" } ]
2009-02-10T00:00:00
[ [ "Alarcon", "Antonio", "" ] ]
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711.2395
Andreas Wirzba
Andreas Wirzba
The Casimir effect as scattering problem
14 pages, 2 figures, plenary talk at QFEXT07, Leipzig, September 2007, some typos corrected
J.Phys.A41:164003,2008
10.1088/1751-8113/41/16/164003
FZJ-IKP-TH-2007-28
quant-ph hep-th nlin.CD nucl-th
null
We show that Casimir-force calculations for a finite number of non-overlapping obstacles can be mapped onto quantum-mechanical billiard-type problems which are characterized by the scattering of a fictitious point particle off the very same obstacles. With the help of a modified Krein trace formula the genuine/finite part of the Casimir energy is determined as the energy-weighted integral over the log-determinant of the multi-scattering matrix of the analog billiard problem. The formalism is self-regulating and inherently shows that the Casimir energy is governed by the infrared end of the multi-scattering phase shifts or spectrum of the fluctuating field. The calculation is exact and in principle applicable for any separation(s) between the obstacles. In practice, it is more suited for large- to medium-range separations. We report especially about the Casimir energy of a fluctuating massless scalar field between two spheres or a sphere and a plate under Dirichlet and Neumann boundary conditions. But the formalism can easily be extended to any number of spheres and/or planes in three or arbitrary dimensions, with a variety of boundary conditions or non-overlapping potentials/non-ideal reflectors.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:27:04 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 13:40:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Wirzba", "Andreas", "" ] ]
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711.2396
Nicolas Rey
Nicolas Rey (LPMCN), Alfonso Munoz, Placida Rodriguez-Hernandez, Alfonso San Miguel (LPMCN)
First-principles study of lithium-doped carbon clathrates under pressure
null
null
10.1088/0953-8984/20/21/215218
null
cond-mat.mtrl-sci
null
We present a theoretical study on the behavior under pressure of the two hypothetical C$_{46}$ and Li$_8$C$_{46}$ type-I carbon clathrates in order to bring new informations concerning their synthesis. Using \textit{ab initio} calculations, we have explored the energetic and structural properties under pressure of these two carbon based cage-like materials. These low-density meta-stable phases show large negative pressure transitions compared to diamond which represent a serious obstacle for their synthesis. However, we evidence that a minimum energy barrier can be reached close to 40 GPa, suggesting that the synthesis of the Li-clathrate under extreme conditions of pressure and temperature may be possible. Electronic band structure with related density of states behavior under pressure as well as the dependence of the active Raman modes with pressure are also examined.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:05:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Rey", "Nicolas", "", "LPMCN" ], [ "Munoz", "Alfonso", "", "LPMCN" ], [ "Rodriguez-Hernandez", "Placida", "", "LPMCN" ], [ "Miguel", "Alfonso San", "", "LPMCN" ] ]
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711.2397
Nikolaus Witte Dr.
Ewgenij Gawrilow, Michael Joswig, Thilo R\"orig, and Nikolaus Witte
Drawing polytopal graphs with polymake
18 pages, 17 examples, 13 figures, 0 theorems
null
null
null
math.CO
null
This note wants to explain how to obtain meaningful pictures of (possibly high-dimensional) convex polytopes, triangulated manifolds, and other objects from the realm of geometric combinatorics such as tight spans of finite metric spaces and tropical polytopes. In all our cases we arrive at specific, geometrically motivated, graph drawing problems. The methods displayed are implemented in the software system polymake.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:10:18 GMT" } ]
2007-11-16T00:00:00
[ [ "Gawrilow", "Ewgenij", "" ], [ "Joswig", "Michael", "" ], [ "Rörig", "Thilo", "" ], [ "Witte", "Nikolaus", "" ] ]
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711.2398
Jonathan Irwin
Jonathan Irwin, Simon Hodgkin, Suzanne Aigrain, Jerome Bouvier, Leslie Hebb, Mike Irwin, Estelle Moraux
The Monitor project: Rotation of low-mass stars in NGC 2362 -- testing the disc regulation paradigm at 5 Myr
13 pages, 17 figures, 1 table. Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12725.x
null
astro-ph
null
We report on the results of a time-series photometric survey of NGC 2362, carried out using the CTIO 4m Blanco telescope and Mosaic-II detector as part of the Monitor project. Rotation periods were derived for 271 candidate cluster members over the mass range 0.1 <~ M/Msol <~ 1.2. The rotation period distributions show a clear mass-dependent morphology, qualitatively similar to that in NGC 2264, as would be expected from the age of this cluster. Using models of angular momentum evolution, we show that angular momentum losses over the ~1-5 Myr age range appear to be needed in order to reproduce the evolution of the slowest rotators in the sample from the ONC to NGC 2362, as found by many previous studies. By incorporating Spitzer IRAC mid-IR measurements, we found that 3-4 objects showing mid-IR excesses indicative of the presence of circumstellar discs were all slow rotators, as would be expected in the disc regulation paradigm for early pre-main sequence angular momentum evolution, but this result is not statistically significant at present, given the extremely limited sample size.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:50:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Irwin", "Jonathan", "" ], [ "Hodgkin", "Simon", "" ], [ "Aigrain", "Suzanne", "" ], [ "Bouvier", "Jerome", "" ], [ "Hebb", "Leslie", "" ], [ "Irwin", "Mike", "" ], [ "Moraux", "Estelle", "" ] ]
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711.2399
Alexander Tiskin
Vladimir Deineko and Alexander Tiskin
Minimum-weight double-tree shortcutting for Metric TSP: Bounding the approximation ratio
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Metric Traveling Salesman Problem (TSP) is a classical NP-hard optimization problem. The double-tree shortcutting method for Metric TSP yields an exponentially-sized space of TSP tours, each of which approximates the optimal solution within at most a factor of 2. We consider the problem of finding among these tours the one that gives the closest approximation, i.e.\ the \emph{minimum-weight double-tree shortcutting}. Previously, we gave an efficient algorithm for this problem, and carried out its experimental analysis. In this paper, we address the related question of the worst-case approximation ratio for the minimum-weight double-tree shortcutting method. In particular, we give lower bounds on the approximation ratio in some specific metric spaces: the ratio of 2 in the discrete shortest path metric, 1.622 in the planar Euclidean metric, and 1.666 in the planar Minkowski metric. The first of these lower bounds is tight; we conjecture that the other two bounds are also tight, and in particular that the minimum-weight double-tree method provides a 1.622-approximation for planar Euclidean TSP.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:19:01 GMT" }, { "version": "v2", "created": "Tue, 16 Dec 2008 11:58:25 GMT" }, { "version": "v3", "created": "Sun, 28 Dec 2008 17:28:18 GMT" } ]
2008-12-30T00:00:00
[ [ "Deineko", "Vladimir", "" ], [ "Tiskin", "Alexander", "" ] ]
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711.24
Jinshan Zhang
Jinshan Zhang
Constituting Atoms of a $\sigma$ Algebra via Its Generator
8 pages
null
null
null
math.PR math.GM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To constitute atoms of a $\sigma$ algebra is not a easy task due to the large number of its elements. However, determining them via generators seems a feasible and simple way since most $\sigma$ algebras are generated by their smaller proper subsets. Precisely, under some conditions each atom of a $\sigma$ algebra equals the intersection of the elements containing a point of the atom in the generator. In this paper, a very weak sufficient condition for determining atoms by the generator is presented. The condition, though not being a necessary one, is shown to be almost the weakest one in the sense that it can hardly be improved.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:21:41 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 07:05:05 GMT" }, { "version": "v3", "created": "Thu, 11 Dec 2008 15:21:40 GMT" } ]
2008-12-11T00:00:00
[ [ "Zhang", "Jinshan", "" ] ]
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711.2401
Genkai Zhang
Siddhartha Sahi and Genkai Zhang
Biorthogonal Expansion of Non-Symmetric Jack Functions
This is a contribution to the Proceedings of the 2007 Midwest Geometry Conference in honor of Thomas P. Branson, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3 (2007), 106, 9 pages
10.3842/SIGMA.2007.106
null
math.CA math.RT
null
We find a biorthogonal expansion of the Cayley transform of the non-symmetric Jack functions in terms of the non-symmetric Jack polynomials, the coefficients being Meixner-Pollaczek type polynomials. This is done by computing the Cherednik-Opdam transform of the non-symmetric Jack polynomials multiplied by the exponential function.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:21:45 GMT" } ]
2008-04-25T00:00:00
[ [ "Sahi", "Siddhartha", "" ], [ "Zhang", "Genkai", "" ] ]
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711.2402
J. Schaffner-Bielich
Irina Sagert, Mirjam Wietoska, Jurgen Schaffner-Bielich, Christian Sturm
Neutron star versus heavy-ion data: is the nuclear equation of state hard or soft?
10 pages, 3 figures, talk given at the International Symposium on Exotic States of Nuclear Matter (EXOCT07), Catania, Italy, June 11-15, 2007
null
null
null
astro-ph nucl-th
null
Recent astrophysical observations of neutron stars and heavy-ion data are confronted with our present understanding of the equation of state of dense hadronic matter. Emphasis is put on the possible role of the presence of hyperons in the interior of compact stars. We argue that data from low-mass pulsars provide an important cross-check between high-density astrophysics and heavy-ion physics.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:21:55 GMT" } ]
2007-11-16T00:00:00
[ [ "Sagert", "Irina", "" ], [ "Wietoska", "Mirjam", "" ], [ "Schaffner-Bielich", "Jurgen", "" ], [ "Sturm", "Christian", "" ] ]
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711.2403
Jens Wirth
Fumihiko Hirosawa and Jens Wirth
$C^m$-theory of damped wave equations with stabilisation
13 pages
J. Math. Anal. Appl. 343(2):1022-1035, 2008
10.1016/j.jmaa.2008.02.024
null
math.AP
null
The aim of this note is to extend the energy decay estimates from [J. Wirth, J. Differential Equations 222 (2006) 487--514] to a broader class of time-dependent dissipation including very fast oscillations. This is achieved using stabilisation conditions on the coefficient in the spirit of [F. Hirosawa, Math. Ann. 339/4 (2007) 819--839].
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:23:49 GMT" } ]
2010-05-17T00:00:00
[ [ "Hirosawa", "Fumihiko", "" ], [ "Wirth", "Jens", "" ] ]
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711.2404
Yota Takamura
Yota Takamura, Ryosho Nakane, Hiro Munekata and Satoshi Sugahara
Characterization of half-metallic L2_1-phase Co_2FeSi full-Heusler alloy films formed by rapid thermal annealing
18 pages, 5 figures
J. Appl. Phys. 103 (2008) 07D719
10.1063/1.2838648
null
cond-mat.mtrl-sci
null
The authors developed a preparation technique of Co_2FeSi full-Heusler alloy films with the L2_1-ordered structure on silicon-on-insulator (SOI) substrates, employing rapid thermal annealing (RTA). The Co_2FeSi full-Heusler alloy films were successfully formed by RTA-induced silicidation reaction between an ultrathin SOI (001) layer and Fe/Co layers deposited on it. The highly (110)-oriented L2_1-phase polycrystalline full-Heusler alloy films were obtained at the RTA temperature of 700 C. Crystallographic and magnetic properties of the RTA-formed full-Heusler alloy films were qualitatively the same as those of bulk full-Heusler alloy. This technique is compatible with metal source/drain formation process in advanced CMOS technology and would be applicable to the fabrication of the half-metallic source/drain of MOSFET type of spin transistors.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:02:14 GMT" } ]
2010-05-26T00:00:00
[ [ "Takamura", "Yota", "" ], [ "Nakane", "Ryosho", "" ], [ "Munekata", "Hiro", "" ], [ "Sugahara", "Satoshi", "" ] ]
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711.2405
Natalia Babych
Natalia O. Babych, Ilia V. Kamotski and Valery P. Smyshlyaev
Homogenization of spectral problems in bounded domains with doubly high contrasts
23 pages, 2 figures
null
null
null
math.SP math.AP
null
Homogenization of a spectral problem in a bounded domain with a high contrast in both stiffness and density is considered. For a special critical scaling, two-scale asymptotic expansions for eigenvalues and eigenfunctions are constructed. Two-scale limit equations are derived and relate to certain non-standard self-adjoint operators. In particular they explicitly display the first two terms in the asymptotic expansion for the eigenvalues, with a surprising bound for the error of order \epsilon^{5/4} proved.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:26:21 GMT" } ]
2007-11-16T00:00:00
[ [ "Babych", "Natalia O.", "" ], [ "Kamotski", "Ilia V.", "" ], [ "Smyshlyaev", "Valery P.", "" ] ]
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711.2406
Matthias Bergner
Matthias Bergner, Jens Dittrich
On Surfaces of Prescribed Weighted Mean Curvature
null
null
null
null
math.DG math.AP
null
Utilizing a weight matrix we study surfaces of prescribed weighted mean curvature which yield a natural generalisation to critical points of anisotropic surface energies. We first derive a differential equation for the normal of immersions with prescribed weighted mean curvature, generalising a result of Clarenz and von der Mosel. Next we study graphs of prescribed weighted mean curvature, for which a quasilinear elliptic equation is proved. Using this equation, we can show height and boundary gradient estimates. Finally, we solve the Dirichlet problem for graphs of prescribed weighted mean curvature.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:31:37 GMT" } ]
2007-11-16T00:00:00
[ [ "Bergner", "Matthias", "" ], [ "Dittrich", "Jens", "" ] ]
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711.2407
S. A. Tarasenko
S.A. Tarasenko
Electron scattering in quantum wells subjected to an in-plane magnetic field
5 pages, 1 figure
Phys. Rev. B 77, 085328 (2008)
10.1103/PhysRevB.77.085328
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
It is shown that the electron scattering by static defects, acoustic or optical phonons in quantum wells subjected to an in-plane magnetic field is asymmetric. The probability of scattering contains terms which are proportional to both the electron wave vector and the magnetic field components. The terms under study are caused by the lack of an inversion center in quantum wells due to structure or bulk inversion asymmetry although they are of pure diamagnetic origin. Such a magnetic field induced asymmetry of scattering can be responsible for a number of phenomena. In particular, the asymmetry of inelastic electron-phonon interaction leads to an electric current flow if only the electron gas is driven out of thermal equilibrium with the crystal lattice.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:35:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Tarasenko", "S. A.", "" ] ]
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