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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.2398 | Fernando Brandao | Fernando G.S.L. Brandao, Michael J. Hartmann, Martin B. Plenio | Light-shift-induced photonic nonlinearities | 4 pages, 4 figures | New J. Phys. 10, 043010 (2008) | 10.1088/1367-2630/10/4/043010 | null | quant-ph | null | We propose a new method to produce self- and cross-Kerr photonic
nonlinearities, using light-induced Stark shifts due to the interaction of a
cavity mode with atoms. The proposed experimental set-up is considerably
simpler than in previous approaches, while the strength of the nonlinearity
obtained with a single atom is the same as in the setting based on
electromagnetically induced transparency. Furthermore our scheme can be applied
to engineer effective photonic nonlinear interactions whose strength increases
with the number of atoms coupled to the cavity mode, leading to photon-photon
interactions several orders of magnitude larger than previously considered
possible.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 16:47:59 GMT"
}
] | 2008-04-11T00:00:00 | [
[
"Brandao",
"Fernando G. S. L.",
""
],
[
"Hartmann",
"Michael J.",
""
],
[
"Plenio",
"Martin B.",
""
]
] |
0705.2399 | Vladimir Miransky | Michio Hashimoto and V. A. Miransky | Gluonic phases and phase diagram in neutral two flavor dense QCD | PTPTeX, 12 pages, 5 figures; v2: to match published version | Prog.Theor.Phys.118:303-314,2007 | 10.1143/PTP.118.303 | UWO-TH-07/08 | hep-ph hep-th nucl-th | null | A numerical analysis of several phases in the cold neutral two flavor dense
quark matter is realized. In the analysis, besides the normal, single plane
wave LOFF, and color superconducting 2SC/g2SC phases, we also include two
gluonic phases (the gluonic cylindrical phase II and the gluonic color-spin
locked one). It is shown that these two gluonic phases are dynamically realized
and, on the basis of this analysis, the phase diagram with respect to the
coupling strength in this medium is suggested. In particular, it is shown that
the gluonic phases are energetically favorable in a wide region of the
parameter space. On the other hand, there also exists a window where the LOFF
phase is stable. The 2SC state and the normal one are realized in the strong
and weak coupling regimes, respectively, as was expected.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:19:50 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Aug 2007 16:00:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hashimoto",
"Michio",
""
],
[
"Miransky",
"V. A.",
""
]
] |
0705.2400 | Peter Mohr | P. Mohr, Zs. Fulop, H. Utsunomiya | Photon-induced Nucleosynthesis: Current Problems and Experimental
Approaches | 13 pages, 6 figures, EPJA, accepted | Eur. Phys. J. A 32, 357-369 (2007) | 10.1140/epja/i2006-10378-y | null | nucl-ex astro-ph | null | Photon-induced reactions play a key role in the nucleosynthesis of rare
neutron-deficient p-nuclei. The paper focuses on (gamma,alpha), (gamma,p), and
(gamma,n) reactions which define the corresponding p-process path. The relation
between stellar reaction rates and laboratory cross sections is analyzed for
photon-induced reactions and their inverse capture reactions to evaluate
various experimental approaches. An improved version S_C(E) of the
astrophysical S-factor is suggested which is based on the Coulomb wave
functions. S_C(E) avoids the apparent energy dependence which is otherwise
obtained for capture reactions on heavy nuclei. It is found that a special type
of synchrotron radiation available at SPring-8 that mimics stellar blackbody
radiation at billions of Kelvin is a promising tool for future experiments. By
using the blackbody synchrotron radiation, sufficient event rates for
(gamma,alpha) and (gamma,p) reactions in the p-process path can be expected.
These experiments will provide data to improve the nuclear parameters involved
in the statistical model and thus reduce the uncertainties of nucleosynthesis
calculations.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 16:54:33 GMT"
}
] | 2007-12-31T00:00:00 | [
[
"Mohr",
"P.",
""
],
[
"Fulop",
"Zs.",
""
],
[
"Utsunomiya",
"H.",
""
]
] |
0705.2401 | Jony Hudson | J. J. Hudson, H. T. Ashworth, D. M. Kara, M. R. Tarbutt, B. E. Sauer,
E. A. Hinds | Pulsed beams as field probes for precision measurement | 6 pages, 12 figures. Figures heavily compressed to comply with
arxiv's antediluvian file-size policy | Phys. Rev. A, 76, 033410 (2007) | 10.1103/PhysRevA.76.033410 | null | physics.atom-ph | null | We describe a technique for mapping the spatial variation of static electric,
static magnetic, and rf magnetic fields using a pulsed atomic or molecular
beam. The method is demonstrated using a beam designed to measure the electric
dipole moment of the electron. We present maps of the interaction region,
showing sensitivity to (i) electric field variation of 1.5 V/cm at 3.3 kV/cm
with a spatial resolution of 15 mm; (ii) magnetic field variation of 5 nT with
25 mm resolution; (iii) radio-frequency magnetic field amplitude with 15 mm
resolution. This new diagnostic technique is very powerful in the context of
high-precision atomic and molecular physics experiments, where pulsed beams
have not hitherto found widespread application.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 17:17:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hudson",
"J. J.",
""
],
[
"Ashworth",
"H. T.",
""
],
[
"Kara",
"D. M.",
""
],
[
"Tarbutt",
"M. R.",
""
],
[
"Sauer",
"B. E.",
""
],
[
"Hinds",
"E. A.",
""
]
] |
0705.2402 | Aram Kotzinian | Aram Kotzinian (on behalf of the COMPASS collaboration) | Beyond Collins and Sivers: further measurements of the target transverse
spin-dependent azimuthal asymmetries in semi-inclusive DIS from COMPASS | Talk given on XV Internetional Workshop on Deep-Inelastic Scattering
and Related Subjects, April 16-20, 2007, Munich, Germany | null | null | null | hep-ex | null | In semi-inclusive DIS of polarized leptons on a transversely polarized target
eight azimuthal modulations appear in the cross-section. Within QCD parton
model four azimuthal asymmetries can be interpreted at leading order, two of
them being the already measured Collins and Sivers asymmetries. The other two
leading twist asymmetries, related to different transverse momentum dependent
quark distribution functions, and also additional four asymmetries which can be
interpreted as twist-three contributions have been measured for the first time
at COMPASS, using a 160 GeV/c longitudinally polarized ($P_{beam}\simeq -0.8$)
muon beam and a transversely polarized $^6LiD$ target. We present here the
preliminary results from the 2002-2004 data.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 17:18:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kotzinian",
"Aram",
"",
"on behalf of the COMPASS collaboration"
]
] |
0705.2403 | Efrain J. Ferrer | Efrain J. Ferrer and Vivian de la Incera | Chromomagnetic Instability and Induced Magnetic Field in Neutral
Two-Flavor Color Superconductivity | Version to appear in PRD | Phys.Rev.D76:114012,2007 | 10.1103/PhysRevD.76.114012 | null | hep-ph astro-ph nucl-th | null | We find that the chromomagnetic instability existing in neutral two- flavor
color superconductivity at moderate densities is removed by the formation of an
inhomogeneous condensate of charged gluons and the corresponding induction of a
magnetic field. It is shown that this inhomogeneous ground state is
energetically favored over a homogeneous one. The spontaneous induction of a
magnetic field in a color superconductor at moderate densities can be of
interest for the astrophysics of compact stellar objects exhibiting strong
magnetic fields as magnetars.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:36:42 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 23:03:06 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Oct 2007 19:54:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ferrer",
"Efrain J.",
""
],
[
"de la Incera",
"Vivian",
""
]
] |
0705.2404 | Thane E. Plambeck | Thane E. Plambeck, Aaron N. Siegel | Misere quotients for impartial games: Supplementary material | Supplement to the paper Misere Quotients for Impartial Games. 17
pages | null | null | null | math.CO math.AC | null | We provide supplementary appendices to the paper Misere quotients for
impartial games. These include detailed solutions to many of the octal games
discussed in the paper, and descriptions of the algorithms used to compute most
of our solutions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 17:59:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Plambeck",
"Thane E.",
""
],
[
"Siegel",
"Aaron N.",
""
]
] |
0705.2405 | Cosmo Lupo | C. Lupo, V. I. Man'ko, G. Marmo | Qubit-portraits of qudit states and quantum correlations | 12 pages, 4 figures | J.Phys.A40:13091-13100,2007 | 10.1088/1751-8113/40/43/016 | null | quant-ph | null | The machinery of qubit-portraits of qudit states, recently presented, is
consider here in more details in order to characterize the presence of quantum
correlations in bipartite qudit states. In the tomographic representation of
quantum mechanics, Bell-like inequalities are interpreted as peculiar
properties of a family of classical joint probability distributions which
describe the quantum state of two qudits. By means of the qubit-portraits
machinery a semigroup of stochastic matrices can be associated to a given
quantum state. The violation of the CHSH inequalities is discussed in this
framework with some examples, we found that quantum correlations in qutrit
isotropic states can be detected by the suggested method while it cannot in the
case of qutrit Werner states.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:02:03 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 10:21:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lupo",
"C.",
""
],
[
"Man'ko",
"V. I.",
""
],
[
"Marmo",
"G.",
""
]
] |
0705.2406 | Massimiliano Lattanzi | M. Lattanzi and J.W.F. Valle | Decaying warm dark matter and neutrino masses | 4 pages, 3 figures. Replaced to match published version. Minor
changes made to address referees' comments. References added | Phys.Rev.Lett.99:121301,2007 | 10.1103/PhysRevLett.99.121301 | IFIC/06-39 | astro-ph hep-ph | null | Neutrino masses may arise from spontaneous breaking of ungauged lepton
number. Due to quantum gravity effects the associated Goldstone boson - the
majoron - will pick up a mass. We determine the lifetime and mass required by
cosmic microwave background observations so that the massive majoron provides
the observed dark matter of the Universe. The majoron DDM scenario fits nicely
in models where neutrino masses arise a la seesaw, and may lead to other
possible cosmological implications.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:19:21 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Nov 2007 19:27:31 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Lattanzi",
"M.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
0705.2407 | Oguz C. Durumeric | Oguz C. Durumeric | Nonuniform Thickness and Weighted Distance | null | null | null | null | math.GT math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonuniform tubular neighborhoods of curves in Euclidean n-space are studied
by using weighted distance functions and generalizing the normal exponential
map. Different notions of injectivity radii are introduced to investigate
singular but injective exponential maps. A generalization of the thickness
formula is obtained for nonuniform thickness. All singularities within almost
injectivity radius are classified by the Horizontal Collapsing Property.
Examples are provided to show the distinction between the different types of
injectivity radii, as well as showing that the standard differentiable
injectivity radius fails to be upper semicontinuous on a singular set of weight
functions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:24:56 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Aug 2008 16:39:47 GMT"
}
] | 2008-08-27T00:00:00 | [
[
"Durumeric",
"Oguz C.",
""
]
] |
0705.2408 | Brett Parker | Brett Parker | Exploded Fibrations | 39 pages, 16 figures, to appear in proceedings of the 13th Gokova
Geometry and Topology conference | null | null | null | math.SG | null | Initiated by Gromov, the study of holomorphic curves in symplectic manifolds
has been a powerfull tool in symplectic topology, however the moduli space of
holomorphic curves is often very difficult to find. A common technique is to
study the limiting behavior of holomorphic curves in a degenerating family of
complex structures which corresponds to a kind of adiabatic limit. The category
of exploded fibrations is an extension of the smooth category in which some of
these degenerations can be described as smooth families.
The first part of this paper is devoted to defining exploded fibrations and a
slightly more specialized category of exploded torus fibrations. Later sections
contain the transverse interesction theory for exploded fibrations and some
examples of holomorphic curves in exploded torus fibrations, including a brief
discussion of the relationship between tropical geometry and exploded torus
fibrations. In the final section, the perturbation theory of holomorphic curves
in exploded torus fibrations is sketched.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:47:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Parker",
"Brett",
""
]
] |
0705.2409 | Gerald A. Miller | Gerald A. Miller | Charge Density of the Neutron | 7 pages, three figures The replacement mainly concerns correcting an
error made in computing the proton up and down quark densities from the
correctly computed proton and neutron charge densities. The proton central u
quark density is now larger than that of the d quark | Phys.Rev.Lett.99:112001,2007 | 10.1103/PhysRevLett.99.112001 | NT@UW-07-07 | nucl-th hep-ph nucl-ex | null | A model-independent analysis of the infinite-momentum-frame charge density of
partons in the transverse plane is presented for the nucleon. We find that the
neutron parton charge density is negative at the center, so that the square of
the transverse charge radius is positive, in contrast with many expectations.
Additionally, the proton's central u quark charge density is larger than that
of the d quark by about 70 %. The proton (neutron) charge density has a long
range positively (negatively) charged component.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:28:30 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 22:58:57 GMT"
},
{
"version": "v3",
"created": "Mon, 19 Nov 2007 23:55:53 GMT"
}
] | 2010-01-06T00:00:00 | [
[
"Miller",
"Gerald A.",
""
]
] |
0705.2410 | Gero von Gersdorff | Gero von Gersdorff | A New Class of Rank Breaking Orbifolds | 26 pages, 1 figure. v2: some minor changes to references, typos
corrected | Nucl.Phys.B793:192-210,2008 | 10.1016/j.nuclphysb.2007.10.003 | null | hep-th hep-ph | null | We describe field-theory T^2/Z_n orbifolds that offer new ways of breaking
SU(N) to lower rank subgroups. We introduce a novel way of embedding the point
group into the gauge group, beyond the usual mapping of torus and root
lattices. For this mechanism to work the torus Wilson lines must carry
nontrivial 't Hooft flux. The rank lowering mechanism proceeds by inner
automorphisms but is not related to continous Wilson lines and does not give
rise to any associated moduli. We give a complete classification of all
possible SU(N) breaking patterns. We also show that the case of general gauge
group can already be understood entirely in terms of the SU(N) case and the
knowledge of standard orbifold constructions with vanishing 't Hooft flux.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:33:37 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 18:14:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"von Gersdorff",
"Gero",
""
]
] |
0705.2411 | Carlo Luciano Bianco | Carlo Luciano Bianco, Remo Ruffini, Gregory Vereshchagin, She-Sheng
Xue | Equations of motion, initial and boundary conditions for GRB | 10 pages, 8 figures | J.Korean Phys.Soc.49:722-731,2006 | null | null | astro-ph | null | We compare and contrast the different approaches to the optically thick
adiabatic phase of GRB all the way to the transparency. Special attention is
given to the role of the rate equation to be self consistently solved with the
relativistic hydrodynamic equations. The works of Shemi and Piran (1990),
Piran, Shemi and Narayan (1993), Meszaros, Laguna and Rees (1993) and Ruffini,
Salmonson, Wilson and Xue (1999,2000) are compared and contrasted. The role of
the baryonic loading in these three treatments is pointed out. Constraints on
initial conditions for the fireball produced by electro-magnetic black hole are
obtained.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:35:53 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bianco",
"Carlo Luciano",
""
],
[
"Ruffini",
"Remo",
""
],
[
"Vereshchagin",
"Gregory",
""
],
[
"Xue",
"She-Sheng",
""
]
] |
0705.2412 | Benoit Charbonneau | Benoit Charbonneau and Jacques Hurtubise | The Nahm transform for calorons | Dedicated to Nigel Hitchin on the occasion of his sixtieth birthday | null | null | null | math.DG | null | In this paper, we complete the proof of an equivalence given by Nye and
Singer of the equivalence between calorons (instantons on $S^1\times R^3$) and
solutions to Nahm's equations over the circle, both satisfying appropriate
boundary conditions. Many of the key ingredients are provided by a third way of
encoding the same data which involves twistors and complex geometry.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:36:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Charbonneau",
"Benoit",
""
],
[
"Hurtubise",
"Jacques",
""
]
] |
0705.2413 | Nikolas Kauer | N. Kauer | Accurate backgrounds to Higgs production at the LHC | 9 pages, 4 figures. Invited talk at the ``Physics at LHC''
Conference, Cracow, Poland, July 3-8, 2006 | ActaPhys.Polon.B38:813-820,2007 | null | null | hep-ph | null | Corrections of 10-30% for backgrounds to the H --> WW --> l^+l^-\sla{p}_T
search in vector boson and gluon fusion at the LHC are reviewed to make the
case for precise and accurate theoretical background predictions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:37:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kauer",
"N.",
""
]
] |
0705.2414 | Nye Evans | A. Evans (Keele), C. E. Woodward, L. A. Helton, R. D. Gehrz
(Minnesota), D. K. Lynch, R. J. Rudy, R. W. Russell (Aerospace Corporation),
T. Kerr (UKIRT), M. F. Bode, M. J. Darnley (Liverpool John Moores), S. P. S.
Eyres (Central Lancs), T. R. Geballe (Gemini), T. J. O'Brien, R. J. Davis
(Manchester), S. Starrfield, J.-U. Ness (Arizon State), J. Drake (CfA), J. P.
Osborne, K. L. Page (Leicester), G. Schwarz (Steward Observatory), J.
Krautter (Landessternwarte) | Spitzer and ground-based infrared observations of the 2006 eruption of
RS Ophiuchi | 13 pages, 4 figures, accepted for publication in ApJ Letters | null | 10.1086/519924 | null | astro-ph | null | We present Spitzer Space Telescope and complementary ground-based infrared
observations of the recurrent nova RS Ophiuchi, obtained over the period 64-111
days after the 2006 eruption. The Spitzer IRS data show a rich emission line
spectrum superimposed on a free-free continuum. The presence of fine structure
and coronal infrared lines lead us to deduce that there are at least two
temperatures (1.5e5K and 9e5K) in the ejecta/wind environment, and that the
electron density in the `cooler' region is 2.2e5 cm-3. The determination of
elemental abundances is not straightforward but on the assumption that the Ne
and O fine structure lines arise in the same volume of the ejecta, the O/Ne
ratio is >~0.6 by number.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:43:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Evans",
"A.",
"",
"Keele"
],
[
"Woodward",
"C. E.",
"",
"Minnesota"
],
[
"Helton",
"L. A.",
"",
"Minnesota"
],
[
"Gehrz",
"R. D.",
"",
"Minnesota"
],
[
"Lynch",
"D. K.",
"",
"Aerospace Corporation"
],
[
"Rudy",
"R. J.",
"",
"Aerospace Corporation"
],
[
"Russell",
"R. W.",
"",
"Aerospace Corporation"
],
[
"Kerr",
"T.",
"",
"UKIRT"
],
[
"Bode",
"M. F.",
"",
"Liverpool John Moores"
],
[
"Darnley",
"M. J.",
"",
"Liverpool John Moores"
],
[
"Eyres",
"S. P. S.",
"",
"Central Lancs"
],
[
"Geballe",
"T. R.",
"",
"Gemini"
],
[
"O'Brien",
"T. J.",
"",
"Manchester"
],
[
"Davis",
"R. J.",
"",
"Manchester"
],
[
"Starrfield",
"S.",
"",
"Arizon State"
],
[
"Ness",
"J. -U.",
"",
"Arizon State"
],
[
"Drake",
"J.",
"",
"CfA"
],
[
"Osborne",
"J. P.",
"",
"Leicester"
],
[
"Page",
"K. L.",
"",
"Leicester"
],
[
"Schwarz",
"G.",
"",
"Steward Observatory"
],
[
"Krautter",
"J.",
"",
"Landessternwarte"
]
] |
0705.2415 | Carlo Luciano Bianco | Maria Grazia Bernardini, Carlo Luciano Bianco, Letizia Caito, Pascal
Chardonnet, Alessandra Corsi, Maria Giovanna Dainotti, Federico Fraschetti,
Roberto Guida, Remo Ruffini, She-Sheng Xue | GRB970228 as a prototype for short GRBs with afterglow | 2 pages, 1 figure, to appear in the proceedings of "Swift and GRBs",
Venice, 2006, Il Nuovo Cimento, in press | Nuovo Cim.B121:1439-1440,2006 | 10.1393/ncb/i2007-10283-0 | null | astro-ph | null | GRB970228 is analyzed as a prototype to understand the relative role of short
GRBs and their associated afterglows, recently observed by Swift and HETE-II.
Detailed theoretical computation of the GRB970228 light curves in selected
energy bands are presented and compared with observational BeppoSAX data.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:49:02 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Bernardini",
"Maria Grazia",
""
],
[
"Bianco",
"Carlo Luciano",
""
],
[
"Caito",
"Letizia",
""
],
[
"Chardonnet",
"Pascal",
""
],
[
"Corsi",
"Alessandra",
""
],
[
"Dainotti",
"Maria Giovanna",
""
],
[
"Fraschetti",
"Federico",
""
],
[
"Guida",
"Roberto",
""
],
[
"Ruffini",
"Remo",
""
],
[
"Xue",
"She-Sheng",
""
]
] |
0705.2416 | Jeremy Quastel | Jeremy Quastel and Benedek Valko | A note on the diffusivity of finite-range asymmetric exclusion processes
on Z | null | null | null | null | math.PR math-ph math.MP | null | The diffusivity $D(t)$ of finite-range asymmetric exclusion processes on
$\mathbb Z$ with non-zero drift is expected to be of order $t^{1/3}$.
Sepp\"{a}l\"ainen and Bal\'azs recently proved this conjecture for the nearest
neighbor case. We extend their results to general finite range exclusion by
proving that the Laplace transform of the diffusivity is of the conjectured
order. We also obtain a pointwise upper bound for $D(t)$ the correct order.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:50:58 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 18:44:30 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Quastel",
"Jeremy",
""
],
[
"Valko",
"Benedek",
""
]
] |
0705.2417 | Carlo Luciano Bianco | Carlo Luciano Bianco, Letizia Caito, Remo Ruffini | Theoretical interpretation of GRB 011121 | 2 pages, 1 figure, to appear in the proceedings of "Swift and GRBs",
Venice, 2006, Il Nuovo Cimento, in press | Nuovo Cim.B121:1441-1442,2006 | 10.1393/ncb/i2007-10263-4 | null | astro-ph | null | GRB011121 is analyzed as a prototype to understand the ``flares'' recently
observed by Swift in the afterglow of many GRB sources. Detailed theoretical
computation of the GRB011121 light curves in selected energy bands are
presented and compared and contrasted with observational BeppoSAX data.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:52:36 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Bianco",
"Carlo Luciano",
""
],
[
"Caito",
"Letizia",
""
],
[
"Ruffini",
"Remo",
""
]
] |
0705.2418 | Janina Maultzsch | M. Mohr, J. Maultzsch, E. Dobardzic, S. Reich, I. Milosevic, M.
Damnjanovic, A. Bosak, M. Krisch, C. Thomsen | The phonon dispersion of graphite by inelastic x-ray scattering | 7 pages; submitted to Phys. Rev. B | null | 10.1103/PhysRevB.76.035439 | null | cond-mat.mtrl-sci | null | We present the full in-plane phonon dispersion of graphite obtained from
inelastic x-ray scattering, including the optical and acoustic branches, as
well as the mid-frequency range between the $K$ and $M$ points in the Brillouin
zone, where experimental data have been unavailable so far. The existence of a
Kohn anomaly at the $K$ point is further supported. We fit a fifth-nearest
neighbour force-constants model to the experimental data, making improved
force-constants calculations of the phonon dispersion in both graphite and
carbon nanotubes available.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 18:55:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mohr",
"M.",
""
],
[
"Maultzsch",
"J.",
""
],
[
"Dobardzic",
"E.",
""
],
[
"Reich",
"S.",
""
],
[
"Milosevic",
"I.",
""
],
[
"Damnjanovic",
"M.",
""
],
[
"Bosak",
"A.",
""
],
[
"Krisch",
"M.",
""
],
[
"Thomsen",
"C.",
""
]
] |
0705.2419 | Mikhail Pletyukhov | M. Pletyukhov and S. Konschuh | Charge and spin density response functions of the clean two-dimensional
electron gas with Rashba spin-orbit coupling at finite momenta and
frequencies | 15 pages, 9 figures | null | 10.1140/epjb/e2007-00319-8 | null | cond-mat.mes-hall | null | We analytically evaluate charge and spin density response functions of the
clean two-dimensional electron gas with Rashba spin-orbit coupling at finite
momenta and frequencies. On the basis of our exact expressions we discuss the
accuracy of the long-wavelength and the quasiclassical approximations. We also
derive the static limit of spin susceptibilities and demonstrate, in
particular, how the Kohn-like anomalies in their derivatives are related to the
spin-orbit modification of the Ruderman-Kittel-Kasuya-Yosida interaction.
Taking into account screening and exchange effects of the Coulomb interaction,
we describe the collective charge and spin density excitation modes which
appear to be coupled due to nonvanishing spin-charge response function.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:01:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pletyukhov",
"M.",
""
],
[
"Konschuh",
"S.",
""
]
] |
0705.2420 | Niels Ubbelohde | C. Fricke, F. Hohls, W. Wegscheider, and R. J. Haug | Bimodal Counting Statistics in Single Electron Tunneling through a
Quantum Dot | null | null | 10.1103/PhysRevB.76.155307 | null | cond-mat.mes-hall | null | We explore the full counting statistics of single electron tunneling through
a quantum dot using a quantum point contact as non-invasive high bandwidth
charge detector. The distribution of counted tunneling events is measured as a
function of gate and source-drain-voltage for several consecutive electron
numbers on the quantum dot. For certain configurations we observe
super-Poissonian statistics for bias voltages at which excited states become
accessible. The associated counting distributions interestingly show a bimodal
characteristic. Analyzing the time dependence of the number of electron counts
we relate this to a slow switching between different electron configurations on
the quantum dot.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:08:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fricke",
"C.",
""
],
[
"Hohls",
"F.",
""
],
[
"Wegscheider",
"W.",
""
],
[
"Haug",
"R. J.",
""
]
] |
0705.2421 | Mustapha Bentaiba | S.-A. Yahiaoui, S. Hattou, M. Bentaiba | Generalized Morse and Poschl-Teller potentials : The connection via
Schrodinger equation | 17 pages, 0 figures | Annals of Physics, Volume 322, Issue 11, November 2007, Pages
2733-2744 | 10.1016/j.aop.2007.07.003 | null | math-ph math.MP | null | We present here a systematic and unified treatment to connect the Schrodinger
equation corresponding to generalized Morse and Poschl-Teller potentials. We
then show that the wave functions and generalized potentials are linked through
the Fourier and Hankel transforms, respectively.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:11:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yahiaoui",
"S. -A.",
""
],
[
"Hattou",
"S.",
""
],
[
"Bentaiba",
"M.",
""
]
] |
0705.2422 | Rod Canfield | E. Rodney Canfield and Brendan D. McKay | The asymptotic volume of the Birkhoff polytope | 4 pages, 1 table | null | null | null | math.CO | null | Let m,n be positive integers. Define T(m,n) to be the transportation polytope
consisting of the m x n non-negative real matrices whose rows each sum to 1 and
whose columns each sum to m/n. The special case B(n)=T(n,n) is the much-studied
Birkhoff-von Neumann polytope of doubly-stochastic matrices. Using a recent
asymptotic enumeration of non-negative integer matrices (Canfield and McKay,
2007), we determine the asymptotic volume of T(m,n) as n goes to infinity, with
m=m(n) such that m/n neither decreases nor increases too quickly. In
particular, we give an asymptotic formula for the volume of B(n).
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:13:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Canfield",
"E. Rodney",
""
],
[
"McKay",
"Brendan D.",
""
]
] |
0705.2423 | Laura Richter | L.L. Richter, A.J. Kemball and J.L. Jonas | A VLBI polarization study of SiO masers towards VY CMa | 3 pages, 1 figure: based on a poster paper at IAU Symposium 242:
Astrophysical masers and their environments, held at Alice Springs
(Australia), from March 12-16, 2007 | null | 10.1017/S1743921307013269 | null | astro-ph | null | Maser emission from the SiO molecule has been widely observed in the
near-circumstellar envelopes of late-type, evolved stars. VLBI images can
resolve individual SiO maser spots, providing information about the kinematics
and magnetic field in the extended atmospheres of these stars. This poster
presents full polarization images of several SiO maser lines towards the
supergiant star VY CMa. VY CMa is a particularly strong SiO maser source and
allows observations of a wide range of maser transitions. We discuss
implications of these observations for VY CMa morphology, polarization, and
pumping models.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:31:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Richter",
"L. L.",
""
],
[
"Kemball",
"A. J.",
""
],
[
"Jonas",
"J. L.",
""
]
] |
0705.2424 | Eugene Mishchenko | V. A. Zyuzin, P. G. Silvestrov and E. G. Mishchenko | Spin-Hall edge spin polarization in a ballistic 2D electron system | 4+ pages, 3 figures; final form, Dresselhaus coupling included | Phys. Rev. Lett. 99, 106601 (2007) | 10.1103/PhysRevLett.99.106601 | null | cond-mat.mes-hall | null | Universal properties of spin-Hall effect in ballistic 2D electron systems are
addressed. The net spin polarization across the edge of the conductor is second
order, ~\lambda^2, in spin-orbit coupling constant independent of the form of
the boundary potential, with the contributions of normal and evanescent modes
each being ~ \sqrt{\lambda} but of opposite signs. This general result is
confirmed by the analytical solution for a hard-wall boundary, which also
yields the detailed distribution of the local spin polarization. The latter
shows fast (Friedel) oscillations with the spin-orbit coupling entering via the
period of slow beatings only. Long-wavelength contributions of evanescent and
normal modes exactly cancel each other in the spectral distribution of the
local spin density.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:00:06 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 18:11:05 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Sep 2007 19:53:50 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Zyuzin",
"V. A.",
""
],
[
"Silvestrov",
"P. G.",
""
],
[
"Mishchenko",
"E. G.",
""
]
] |
0705.2425 | Stefano Profumo | Stefano Profumo, Michael J. Ramsey-Musolf and Gabe Shaughnessy | Singlet Higgs Phenomenology and the Electroweak Phase Transition | 36 pages, 13 figures, matches published version; Version with higher
resolution figures available at
http://www.its.caltech.edu/~profumo/higgs/EWPT.pdf | JHEP 0708:010,2007 | 10.1088/1126-6708/2007/08/010 | Caltech MAP-333, MADPH-07-1489 | hep-ph | null | We study the phenomenology of gauge singlet extensions of the Standard Model
scalar sector and their implications for the electroweak phase transition. We
determine the conditions on the scalar potential parameters that lead to a
strong first order phase transition as needed to produce the observed baryon
asymmetry of the universe. We analyze the constraints on the potential
parameters derived from Higgs boson searches at LEP and electroweak precision
observables. For models that satisfy these constraints and that produce a
strong first order phase transition, we discuss the prospective signatures in
future Higgs studies at the Large Hadron Collider and a Linear Collider. We
argue that such studies will provide powerful probes of phase transition
dynamics in models with an extended scalar sector.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 18:06:00 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 23:21:48 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Profumo",
"Stefano",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] |
0705.2426 | Ryan Barnett | Ryan Barnett, Gil Refael, Mason A. Porter, Hans Peter Buchler | Vortex Lattice Locking in Rotating Two-Component Bose-Einstein
Condensates | 6 pages, 2 figures | New J. Phys. 10, 043030 (2008) | 10.1088/1367-2630/10/4/043030 | null | cond-mat.str-el cond-mat.mes-hall nlin.PS physics.atom-ph | null | The vortex density of a rotating superfluid, divided by its particle mass,
dictates the superfluid's angular velocity through the Feynman relation. To
find how the Feynman relation applies to superfluid mixtures, we investigate a
rotating two-component Bose-Einstein condensate, composed of bosons with
different masses. We find that in the case of sufficiently strong interspecies
attraction, the vortex lattices of the two condensates lock and rotate at the
drive frequency, while the superfluids themselves rotate at two different
velocities, whose ratio is the ratio between the particle mass of the two
species. In this paper, we characterize the vortex-locked state, establish its
regime of stability, and find that it surives within a disk smaller than a
critical radius, beyond which vortices become unbound, and the two Bose-gas
rings rotate together at the frequency of the external drive.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:04:00 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 21:48:00 GMT"
},
{
"version": "v3",
"created": "Thu, 24 Jan 2008 22:11:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barnett",
"Ryan",
""
],
[
"Refael",
"Gil",
""
],
[
"Porter",
"Mason A.",
""
],
[
"Buchler",
"Hans Peter",
""
]
] |
0705.2427 | Rolf Schimmrigk | Rolf Schimmrigk | A modularity test for elliptic mirror symmetry | 11 pages | Phys.Lett.B655:84-89,2007 | 10.1016/j.physletb.2007.08.059 | null | hep-th | null | In this note a prediction of an algebraic mirror construction is checked for
elliptic curves of Brieskorn-Pham type via number theoretic methods. It is
shown that the modular forms associated to the Hasse-Weil L-series of mirror
pairs of such curves are identical.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:06:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Schimmrigk",
"Rolf",
""
]
] |
0705.2428 | Andreas Gartner | A. Gartner, L. Prechtel, D. Schuh, A.W. Holleitner, and J.P. Kotthaus | Micropatterned Electrostatic Traps for Indirect Excitons in Coupled GaAs
Quantum Wells | 21 pages, 6 figures, submitted to Phys. Rev. B | null | 10.1103/PhysRevB.76.085304 | null | cond-mat.mes-hall cond-mat.other cond-mat.str-el | null | We demonstrate an electrostatic trap for indirect excitons in a field-effect
structure based on coupled GaAs quantum wells. Within the plane of a double
quantum well indirect excitons are trapped at the perimeter of a SiO2 area
sandwiched between the surface of the GaAs heterostructure and a
semitransparent metallic top gate. The trapping mechanism is well explained by
a combination of the quantum confined Stark effect and local field enhancement.
We find the one-dimensional trapping potentials in the quantum well plane to be
nearly harmonic with high spring constants exceeding 10 keV/cm^2.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:33:32 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Gartner",
"A.",
""
],
[
"Prechtel",
"L.",
""
],
[
"Schuh",
"D.",
""
],
[
"Holleitner",
"A. W.",
""
],
[
"Kotthaus",
"J. P.",
""
]
] |
0705.2429 | Martin Kruczenski | Riei Ishizeki, Martin Kruczenski | Single spike solutions for strings on S2 and S3 | LaTeX, 20 pages, 3 figures. v2: Refs added | Phys.Rev.D76:126006,2007 | 10.1103/PhysRevD.76.126006 | null | hep-th | null | We study solutions for rigidly rotating strings on a two sphere. Among them
we find two limiting cases that have a particular interest, one is the already
known giant magnon and the other we call the single spike solution. The
limiting behavior of this last solution is a string infinitely wrapped around
the equator. It differs from that solution by the existence of a single spike
of height theta that points toward the north pole.
We study its properties and compute its energy E and angular momentum J as a
function of theta. We further generalize the solution by adding one angular
momentum to obtain a solution on S3. We find a spin chain interpretations of
these results in terms of free fermions and the Hubbard model but the exact
relation with the same models derived from the field theory is not clear.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 16:47:50 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Oct 2007 22:01:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ishizeki",
"Riei",
""
],
[
"Kruczenski",
"Martin",
""
]
] |
0705.2430 | George Siopsis | George Siopsis | Poincare recurrences of Schwarzschild black holes | 15 pages | Class.Quant.Grav.24:4133-4146,2007 | 10.1088/0264-9381/24/16/009 | UTHET-07-0201 | hep-th gr-qc | null | We discuss massive scalar perturbations of a Schwarzschild black hole. We
argue that quantum effects alter the effective potential near the horizon
resulting in Poincare recurrences in Green functions. Results at the
semi-classical level are independent of the details of the modification of the
potential provided its minimum near the horizon is inversely proportional to
the square of the Poincare time. This modification may be viewed as a change in
the near-horizon geometry. We consider explicitly the examples of a brick wall,
a smooth cutoff and a wormhole-like modification showing that they all lead to
the same results at leading order.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:34:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Siopsis",
"George",
""
]
] |
0705.2431 | Nikolaos Kidonakis | Nikolaos Kidonakis | Higher-order Threshold Corrections for Single Top Quark Production | 6 pages, 3 figures, presented at DIS 2007, Munich, Germany, April
16-20, 2007 | null | null | null | hep-ph | null | I discuss single top quark production at the Tevatron and the LHC. The cross
section, including soft-gluon threshold corrections through NNNLO, is presented
for each partonic channel. The higher-order corrections provide significant
contributions to the single top cross sections at both colliders.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:36:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kidonakis",
"Nikolaos",
""
]
] |
0705.2432 | Philippe Grenier | Philippe Grenier (for the Belle Collaboration and the Babar
Collaboration) | Charm and charmonium spectroscopy at B-factories | To appear in the proceedings of 42nd Rencontres de Moriond on QCD and
high energy hadronic interactions, La Thuile, Aosta Valley, Italy, 17-24 Mar
2007 | null | null | SLAC-PUB-12518 | hep-ex | null | We report on most recent Charm and Charmonium spectroscopy results from the
B-factories
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:38:14 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Grenier",
"Philippe",
"",
"for the Belle Collaboration and the Babar\n Collaboration"
]
] |
0705.2433 | Mario Cesar Baldiotti | V.G. Bagrov, M.C. Baldiotti, and D.M. Gitman | Charged particles in crossed and longitudinal electromagnetic fields and
beam guides | 14 pages | null | 10.1063/1.2771543 | IF-1635/2007 | quant-ph math-ph math.MP | null | We consider a class of electromagnetic fields that contains crossed fields
combined with longitudinal electric and magnetic fields. We study the motion of
a classical particle (solutions of the Lorentz equations) in such fields. Then,
we present an analysis that allows one to decide which fields from the class
act as a beam guide for charged particles, and we find some time-independent
and time-dependent configurations with beam guiding properties. We demonstrate
that the Klein-Gordon and Dirac equations with all the fields from the class
can be solved exactly. We study these solutions, which were not known before,
and prove that they form complete and orthogonal sets of functions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:50:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bagrov",
"V. G.",
""
],
[
"Baldiotti",
"M. C.",
""
],
[
"Gitman",
"D. M.",
""
]
] |
0705.2434 | Yang Jiao | Y. Jiao, F. H. Stillinger, S. Torquato | Modeling Heterogeneous Materials via Two-Point Correlation Functions: I.
Basic Principles | 37 pages, 26 figures | null | 10.1103/PhysRevE.76.031110 | null | cond-mat.mtrl-sci cond-mat.dis-nn | null | Heterogeneous materials abound in nature and man-made situations. Examples
include porous media, biological materials, and composite materials. Diverse
and interesting properties exhibited by these materials result from their
complex microstructures, which also make it difficult to model the materials.
In this first part of a series of two papers, we collect the known necessary
conditions on the standard two-point correlation function S2(r) and formulate a
new conjecture. In particular, we argue that given a complete two-point
correlation function space, S2(r) of any statistically homogeneous material can
be expressed through a map on a selected set of bases of the function space. We
provide new examples of realizable two-point correlation functions and suggest
a set of analytical basis functions. Moreover, we devise an efficient and
isotropy- preserving construction algorithm, namely, the Lattice-Point
algorithm to generate realizations of materials from their two- point
correlation functions based on the Yeong-Torquato technique. Subsequent
analysis can be performed on the generated images to obtain desired macroscopic
properties. These developments are integrated here into a general scheme that
enables one to model and categorize heterogeneous materials via two-point
correlation functions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:54:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jiao",
"Y.",
""
],
[
"Stillinger",
"F. H.",
""
],
[
"Torquato",
"S.",
""
]
] |
0705.2435 | Luay Azzam Mr. | Luay Azzam and Ender Ayanoglu | Reduced Complexity Sphere Decoding for Square QAM via a New Lattice
Representation | null | null | null | null | cs.IT math.IT | null | Sphere decoding (SD) is a low complexity maximum likelihood (ML) detection
algorithm, which has been adapted for different linear channels in digital
communications. The complexity of the SD has been shown to be exponential in
some cases, and polynomial in others and under certain assumptions. The sphere
radius and the number of nodes visited throughout the tree traversal search are
the decisive factors for the complexity of the algorithm. The radius problem
has been addressed and treated widely in the literature. In this paper, we
propose a new structure for SD, which drastically reduces the overall
complexity. The complexity is measured in terms of the floating point
operations per second (FLOPS) and the number of nodes visited throughout the
algorithm tree search. This reduction in the complexity is due to the ability
of decoding the real and imaginary parts of each jointly detected symbol
independently of each other, making use of the new lattice representation. We
further show by simulations that the new approach achieves 80% reduction in the
overall complexity compared to the conventional SD for a 2x2 system, and almost
50% reduction for the 4x4 and 6x6 cases, thus relaxing the requirements for
hardware implementation.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 20:54:34 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Azzam",
"Luay",
""
],
[
"Ayanoglu",
"Ender",
""
]
] |
0705.2436 | Thomas Markwig | Thomas Markwig | Standard Bases in K[[t_1,...,t_m]][x_1,...,x_n]^s | null | J. Symbolic Comput. 43 (2008), no. 11, 765--786 | null | MR2432956 | math.AC math.AG | null | In this paper we study standard bases for submodules of
K[[t_1,...,t_m]][x_1,...,x_n]^s respectively of their localisation with respect
to a t-local monomial ordering. The main step is to prove the existence of a
division with remainder generalising and combining the division theorems of
Grauert and Mora. Everything else then translates naturally. Setting either m=0
or n=0 we get standard bases for polynomial rings respectively for power series
rings as a special case. We then apply this technique to show that the
t-initial ideal of an ideal over the Puiseux series field can be read of from a
standard basis of its generators. This is an important step in the constructive
proof that each point in the tropical variety of such an ideal admits a
lifting.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:13:12 GMT"
}
] | 2009-07-28T00:00:00 | [
[
"Markwig",
"Thomas",
""
]
] |
0705.2437 | Rahul Jain | Rahul Jain, Jaikumar Radhakrishnan, Pranab Sen | A theorem about relative entropy of quantum states with an application
to privacy in quantum communication | 27 pages, no figures, full version | null | null | null | quant-ph | null | We prove the following theorem about relative entropy of quantum states.
"Substate theorem: Let rho and sigma be quantum states in the same Hilbert
space with relative entropy S(rho|sigma) = Tr rho (log rho - log sigma) = c.
Then for all epsilon > 0, there is a state rho' such that the trace distance
||rho' - rho||_t = Tr sqrt{(rho' - rho)^2} <= epsilon, and
rho'/2^{O(c/epsilon^2)} <= sigma."
It states that if the relative entropy of rho and sigma is small, then there
is a state rho' close to rho, i.e. with small trace distance ||rho' - rho||_t,
that when scaled down by a factor 2^{O(c)} `sits inside', or becomes a
`substate' of, sigma. This result has several applications in quantum
communication complexity and cryptography. Using the substate theorem, we
derive a privacy trade-off for the set membership problem in the two-party
quantum communication model. Here Alice is given a subset A of [n], Bob an
input i in [n], and they need to determine if i in A.
"Privacy trade-off for set membership: In any two-party quantum communication
protocol for the set membership problem, if Bob reveals only k bits of
information about his input, then Alice must reveal at least n/2^{O(k)} bits of
information about her input."
We also discuss relationships between various information theoretic
quantities that arise naturally in the context of the substate theorem.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:16:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Jain",
"Rahul",
""
],
[
"Radhakrishnan",
"Jaikumar",
""
],
[
"Sen",
"Pranab",
""
]
] |
0705.2438 | Stephane Arnouts | S. Arnouts, C.J. Walcher, O. Le Fevre, G. Zamorani, O. Ilbert, V. Le
Brun, L. Pozzetti, S. Bardelli, L. Tresse, E. Zucca, S. Charlot, F.
Lamareille, H.J. McCracken, M. Bolzonella, A. Iovino, C. Lonsdale, M.
Polletta, J. Surace, D. Bottini, B. Garilli, D. Maccagni, J.P. Picat, R.
Scaramella, M. Scodeggio, G. Vettolani, A. Zanichelli, C. Adami, A. Cappi, P.
Ciliegi, T. Contini, S. de la Torre, S. Foucaud, P. Franzetti, I. Gavignaud,
L. Guzzo, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S.
Paltani, R. Pello, A. Pollo, M. Radovich, S. Temporin, D. Vergani | The SWIRE-VVDS-CFHTLS surveys: stellar mass assembly over the last 10
Gyears. Evidence for a major build up of the red sequence between z=2 and z=1 | Accepted to A&A with major changes. 1 table and 13 figures | Astron.Astrophys.476:137-150,2007 | 10.1051/0004-6361:20077632 | null | astro-ph | null | (abridged abstract) We present an analysis of the stellar mass growth over
the last 10 Gyrs using a large 3.6$\mu$ selected sample. We split our sample
into active (blue) and quiescent (red) galaxies. Our measurements of the K-LFs
and LD evolution support the idea that a large fraction of galaxies is already
assembled at $z\sim 1.2$. Based on the analysis of the evolution of the stellar
mass-to-light ratio (in K-band) for the spectroscopic sub-sample, we derive the
stellar mass density for the entire sample. We find that the global evolution
of the stellar mass density is well reproduced by the star formation rate
derived from UV dust corrected measurements. Over the last 8Gyrs, we observe
that the stellar mass density of the active population remains approximately
constant while it gradually increases for the quiescent population over the
same timescale. As a consequence, the growth of the stellar mass in the
quiescent population must be due to the shutoff of star formation in active
galaxies that migrate into the quiescent population. From $z=2$ to $z=1.2$, we
observe a major build-up of the quiescent population with an increase by a
factor of 10 in stellar mass, suggesting that we are observing the epoch when
an increasing fraction of galaxies are ending their star formation activity and
start to build up the red sequence.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:23:28 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 09:42:31 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Sep 2007 21:57:06 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Arnouts",
"S.",
""
],
[
"Walcher",
"C. J.",
""
],
[
"Fevre",
"O. Le",
""
],
[
"Zamorani",
"G.",
""
],
[
"Ilbert",
"O.",
""
],
[
"Brun",
"V. Le",
""
],
[
"Pozzetti",
"L.",
""
],
[
"Bardelli",
"S.",
""
],
[
"Tresse",
"L.",
""
],
[
"Zucca",
"E.",
""
],
[
"Charlot",
"S.",
""
],
[
"Lamareille",
"F.",
""
],
[
"McCracken",
"H. J.",
""
],
[
"Bolzonella",
"M.",
""
],
[
"Iovino",
"A.",
""
],
[
"Lonsdale",
"C.",
""
],
[
"Polletta",
"M.",
""
],
[
"Surace",
"J.",
""
],
[
"Bottini",
"D.",
""
],
[
"Garilli",
"B.",
""
],
[
"Maccagni",
"D.",
""
],
[
"Picat",
"J. P.",
""
],
[
"Scaramella",
"R.",
""
],
[
"Scodeggio",
"M.",
""
],
[
"Vettolani",
"G.",
""
],
[
"Zanichelli",
"A.",
""
],
[
"Adami",
"C.",
""
],
[
"Cappi",
"A.",
""
],
[
"Ciliegi",
"P.",
""
],
[
"Contini",
"T.",
""
],
[
"de la Torre",
"S.",
""
],
[
"Foucaud",
"S.",
""
],
[
"Franzetti",
"P.",
""
],
[
"Gavignaud",
"I.",
""
],
[
"Guzzo",
"L.",
""
],
[
"Marano",
"B.",
""
],
[
"Marinoni",
"C.",
""
],
[
"Mazure",
"A.",
""
],
[
"Meneux",
"B.",
""
],
[
"Merighi",
"R.",
""
],
[
"Paltani",
"S.",
""
],
[
"Pello",
"R.",
""
],
[
"Pollo",
"A.",
""
],
[
"Radovich",
"M.",
""
],
[
"Temporin",
"S.",
""
],
[
"Vergani",
"D.",
""
]
] |
0705.2439 | Gregory B. Sorkin | Gregory B. Sorkin, Angelika Steger and Rico Zenklusen | A tight bound on the collection of edges in MSTs of induced subgraphs | null | null | null | null | math.CO | null | Let $G=(V,E)$ be a complete $n$-vertex graph with distinct positive edge
weights. We prove that for $k\in\{1,2,...,n-1\}$, the set consisting of the
edges of all minimum spanning trees (MSTs) over induced subgraphs of $G$ with
$n-k+1$ vertices has at most $nk-\binom{k+1}{2}$ elements. This proves a
conjecture of Goemans and Vondrak \cite{GV2005}. We also show that the result
is a generalization of Mader's Theorem, which bounds the number of edges in any
edge-minimal $k$-connected graph.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:23:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sorkin",
"Gregory B.",
""
],
[
"Steger",
"Angelika",
""
],
[
"Zenklusen",
"Rico",
""
]
] |
0705.2440 | Alejandro Corichi | Alejandro Corichi, Jose A. Zapata | Quantum Structure of Geometry: Loopy and fuzzy? | 9 pages, no figures | Int.J.Mod.Phys.D17:445-451,2008 | 10.1142/S0218271808012115 | null | gr-qc | null | In any attempt to build a quantum theory of gravity, a central issue is to
unravel the structure of space-time at the smallest scale. Of particular
relevance is the possible definition of coordinate functions within the theory
and the study of their algebraic properties, such as non-commutativity. Here we
approach this issue from the perspective of loop quantum gravity and the
picture of quantum geometry that the formalism offers. In particular, as we
argue here, this emerging picture has two main elements: i) The nature of the
quantum geometry at Planck scale is one-dimensional, polymeric with quantized
geometrical quantities and; ii) Appropriately defined operators corresponding
to coordinates by means of intrinsic, relational, constructions become
non-commuting. This particular feature of the operators, that operationally
localize points on space, gives rise to an emerging geometry that is also, in a
precise sense, fuzzy.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:33:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Corichi",
"Alejandro",
""
],
[
"Zapata",
"Jose A.",
""
]
] |
0705.2441 | Thomas Markwig | Anders Nedergaard Jensen, Hannah Markwig, Thomas Markwig | An algorithm for lifting points in a tropical variety | 33 pages | Collect. Math. 59 (2008), no. 2, 129--165 | null | MR2414142 | math.AG math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to give a constructive proof of one of the basic
theorems of tropical geometry: given a point on a tropical variety (defined
using initial ideals), there exists a Puiseux-valued ``lift'' of this point in
the algebraic variety. This theorem is so fundamental because it justifies why
a tropical variety (defined combinatorially using initial ideals) carries
information about algebraic varieties: it is the image of an algebraic variety
over the Puiseux series under the valuation map. We have implemented the
``lifting algorithm'' using Singular and Gfan if the base field are the
rational numbers. As a byproduct we get an algorithm to compute the Puiseux
expansion of a space curve singularity in (K^{n+1},0).
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:43:21 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Jul 2009 11:08:51 GMT"
}
] | 2009-07-28T00:00:00 | [
[
"Jensen",
"Anders Nedergaard",
""
],
[
"Markwig",
"Hannah",
""
],
[
"Markwig",
"Thomas",
""
]
] |
0705.2442 | Raymundo Baptista | R. Baptista (UFSC and Soar), R. F. Santos (UFSC), M. Faundez-Abans
(LNA), A. Bortoletto (LNA and Iag/Usp) | A study of the evolution of the accretion disk of V2051 Oph through two
outburst cycles | 22 pages, 11 postscript figures, written with aastex macro package.
To appear in the August 2007 issue of The Astronomical Journal | Astron.J.134:867-879,2007 | 10.1086/519762 | UFSC-07-1 | astro-ph | null | We follow the changes in the structure of the accretion disk of the dwarf
nova V2051 Oph along two separate outbursts in order to investigate the causes
of its recurrent outbursts. We apply eclipse mapping techniques to a set of
light curves covering a normal (July 2000) and a low-amplitude (August 2002)
outburst to derive maps of the disk surface brightness distribution at
different phases along the outburst cycles. The sequence of eclipse maps of the
2000 July outburst reveal that the disk shrinks at outburst onset while an
uneclipsed component of 13 per cent of the total light develops. The derived
radial intensity distributions suggest the presence of an outward-moving
heating wave during rise and of an inward-moving cooling wave during decline.
The inferred speed of the outward-moving heating wave is ~ 1.6 km/s, while the
speed of the cooling wave is a fraction of that. A comparison of the measured
cooling wave velocity on consecutive nights indicates that the cooling wave
accelerates as it travels towards disk center, in contradiction with the
prediction of the disk instability model. From the inferred speed of the
heating wave we derive a viscosity parameter alpha_{hot} ~ 0.13, comparable to
the measured viscosity parameter in quiescence. The 2002 August outburst had
lower amplitude (\Delta B ~ 0.8 mag) and the disk at outburst maximum was
smaller than on 2000 July. For an assumed distance of 92 pc, we find that along
both outbursts the disk brightness temperatures remain below the minimum
expected according to the disk instability model. The results suggest that the
outbursts of V2051 Oph are caused by bursts of increased mass transfer from the
mass-donor star.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:42:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Baptista",
"R.",
"",
"UFSC and Soar"
],
[
"Santos",
"R. F.",
"",
"UFSC"
],
[
"Faundez-Abans",
"M.",
"",
"LNA"
],
[
"Bortoletto",
"A.",
"",
"LNA and Iag/Usp"
]
] |
0705.2443 | Daisuke Yamauchi | Daisuke Yamauchi and Misao Sasaki | A Brane World in an Arbitrary Number of Dimensions without Z_2 Symmetry | 12 pages, no figure, PTPtex. Typos corrected and references updated.
The title has been slightly modified. Final version to be published in Prog.
Theor. Phys | Prog.Theor.Phys.118:245-256,2007 | 10.1143/PTP.118.245 | null | gr-qc astro-ph hep-th | null | We consider a brane world in an arbitrary number of dimensions without Z_2
symmetry and derive the effective Einstein equation on the brane, where its
right-hand side is given by the matter on the brane and the curvature in the
bulk. This is achieved by first deriving the junction conditions for a non-Z_2
symmetric brane and second solving the Gauss equation, which relates the mean
extrinsic curvature of the brane to the curvature in the bulk, with respect to
the mean extrinsic curvature. The latter corresponds to formulating an explicit
junction condition on the mean of the extrinsic curvature, analogue to the
Israel junction condition for the jump of the extrinsic curvature. We find that
there appears a new type of an effective anisotropic fluid on the right-hand
side of the effective Einstein equation due to the fact that there is no Z_2
symmetry. The derived equation is a basic equation for the study of
Kaluza-Klein brane worlds in which some dimensions on the brane are
compactified or for a regularization scheme for a higher codimension brane
world, where the Kaluza-Klein compactification on the brane is regarded as a
means to regularize the uncontrollable spacetime singularity caused by the
higher codimension brane.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:06:16 GMT"
},
{
"version": "v2",
"created": "Sat, 26 May 2007 15:10:36 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Aug 2007 10:03:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yamauchi",
"Daisuke",
""
],
[
"Sasaki",
"Misao",
""
]
] |
0705.2444 | Subharthi Ray | Saibal Ray, Basanti Das, Farook Rahaman, Subharthi Ray | Physical properties of Tolman-Bayin solutions: some cases of static
charged fluid spheres in general relativity | 15 pages, 12 figures | Int.J.Mod.Phys.D16:1745-1759,2007 | 10.1142/S021827180701105X | null | astro-ph gr-qc | null | In this article, Einstein-Maxwell space-time has been considered in
connection to some of the astrophysical solutions as previously obtained by
Tolman (1939) and Bayin (1978). The effect of inclusion of charge into these
solutions has been investigated thoroughly and also the nature of fluid
pressure and mass density throughout the sphere have been discussed.
Mass-radius and mass-charge relations have been derived for various cases of
the charged matter distribution. Two cases are obtained where perfect fluid
with positive pressures give rise to electromagnetic mass models such that
gravitational mass is of purely electromagnetic origin.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:46:24 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ray",
"Saibal",
""
],
[
"Das",
"Basanti",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ray",
"Subharthi",
""
]
] |
0705.2445 | Boris Gribkov | A.A.Fraerman, B.A.Gribkov, S.A.Gusev, B. Hjorvarsson, A.Yu.Klimov,
V.L.Mironov, D.S.Nikitushkin, V.V.Rogov, S.N.Vdovichev, H.Zabel | Artificial helical nanomagnets | 6 pages, 4 figures | null | null | null | cond-mat.str-el | null | We demonstrate the existence of a helical state in patterned multilayer
nanomagnets. The artificial helimagnets consist of a stack of single domain
ferromagnetic disks separated by insulating nonmagnetic spacers. The spiral
state is shown to originate from the magnetostatic interaction between nearest
and next nearest neighbouring single-domain disks in the stack. Since the
magnetostatic interaction for such disks is rather strong, the helical state
should be stable at room temperature. The helimagnets were fabricated from a
[Co/Si]*3 multilayer using electron beam lithography. The helical state was
confirmed by a magnetic stray field analysis using magnetic force microscopy.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 13:37:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Fraerman",
"A. A.",
""
],
[
"Gribkov",
"B. A.",
""
],
[
"Gusev",
"S. A.",
""
],
[
"Hjorvarsson",
"B.",
""
],
[
"Klimov",
"A. Yu.",
""
],
[
"Mironov",
"V. L.",
""
],
[
"Nikitushkin",
"D. S.",
""
],
[
"Rogov",
"V. V.",
""
],
[
"Vdovichev",
"S. N.",
""
],
[
"Zabel",
"H.",
""
]
] |
0705.2446 | Alexis Vasseur | Alexis Vasseur | Regularity criterion for 3D Navier-Stokes equations in terms of the
direction of the velocity | 6 pages | null | null | null | math.AP | null | In this short note, we give a link between the regularity of the solution $u$
to the 3D Navier-Stokes equation, and the behavior of the direction of the
velocity $u/|u|$. It is shown that the control of $\Div (u/|u|)$ in a suitable
$L_t^p(L_x^q)$ norm is enough to ensure global regularity. The result is
reminiscent of the criterion in terms of the direction of the vorticity,
introduced first by Constantin and Fefferman. But in this case the condition is
not on the vorticity, but on the velocity itself. The proof, based on very
standard methods, relies on a straightforward relation between the divergence
of the direction of the velocity and the growth of energy along streamlines.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:48:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Vasseur",
"Alexis",
""
]
] |
0705.2447 | Dmitry Beliaev | D. Beliaev, E. J\"arvenp\"a\"a, M. J\"arvenp\"a\"a, A. K\"aenm\"aki,
T. Rajala, S. Smirnov and V. Suomala | Packing dimension of mean porous measures | Revised version | J. Lond. Math. Soc. 80 (2009), no. 2, 514-530 | 10.1112/jlms/jdp040 | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the packing dimension of any mean porous Radon measure on
$\mathbb R^d$ may be estimated from above by a function which depends on mean
porosity. The upper bound tends to $d-1$ as mean porosity tends to its maximum
value. This result was stated in \cite{BS}, and in a weaker form in \cite{JJ1},
but the proofs are not correct. Quite surprisingly, it turns out that mean
porous measures are not necessarily approximable by mean porous sets. We verify
this by constructing an example of a mean porous measure $\mu$ on $\mathbb R$
such that $\mu(A)=0$ for all mean porous sets $A\subset\mathbb R$.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 21:59:04 GMT"
},
{
"version": "v2",
"created": "Mon, 25 May 2009 17:23:43 GMT"
}
] | 2017-02-03T00:00:00 | [
[
"Beliaev",
"D.",
""
],
[
"Järvenpää",
"E.",
""
],
[
"Järvenpää",
"M.",
""
],
[
"Käenmäki",
"A.",
""
],
[
"Rajala",
"T.",
""
],
[
"Smirnov",
"S.",
""
],
[
"Suomala",
"V.",
""
]
] |
0705.2448 | Teddy Cheung | C.C. Cheung (NRAO and Stanford), D.E. Harris (Harvard-CfA), L. Stawarz
(Stanford/KIPAC) | Superluminal Radio Features in the M87 Jet and the Site of Flaring TeV
Gamma-ray Emission | ApJL, accepted. Massaged text and figures to fit within 4 page limit.
Preprint with high-resolution figures:
http://www.stanford.edu/~teddy3c/Preprints/m87vlba.pdf | null | 10.1086/520510 | null | astro-ph | null | Superluminal motion is a common feature of radio jets in powerful gamma-ray
emitting active galactic nuclei. Conventionally, the variable emission is
assumed to originate near the central supermassive black-hole where the jet is
launched on parsec scales or smaller. Here, we report the discovery of
superluminal radio features within a distinct flaring X-ray emitting region in
the jet of the nearby radio galaxy M87 with the Very Long Baseline Array. This
shows that these two phenomenological hallmarks -- superluminal motion and
high-energy variability -- are associated, and we place this activity much
further (>=120 pc) from the ``central engine'' in M87 than previously thought
in relativistic jet sources. We argue that the recent excess very high-energy
TeV emission from M87 reported by the H.E.S.S. experiment originates from this
variable superluminal structure, thus providing crucial insight into the
production region of gamma-ray emission in more distant blazars.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:00:53 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 22:34:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cheung",
"C. C.",
"",
"NRAO and Stanford"
],
[
"Harris",
"D. E.",
"",
"Harvard-CfA"
],
[
"Stawarz",
"L.",
"",
"Stanford/KIPAC"
]
] |
0705.2449 | Kostyantyn Ropotenko | K. Ropotenko | A note on vacuum energy from the de Sitter spectrum | 3 pages, no figures; journal version: new title and minor corrections
added; journal-ref added | Class.Quant.Grav.24:5721-5723,2007 | 10.1088/0264-9381/24/22/N03 | null | gr-qc | null | It is shown that a well-known relation between entropy of a system and its
energy spectrum being applied to the early universe determines the present
vacuum energy and the time scale on which this energy can manifest itself.
Given the present vacuum energy, the relation imposes a constraint on the
initial inflationary state.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 16:23:10 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 08:55:29 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Oct 2007 13:38:30 GMT"
},
{
"version": "v4",
"created": "Fri, 30 Nov 2007 07:47:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ropotenko",
"K.",
""
]
] |
0705.2450 | Ali Mohammad-Djafari | Ali Mohammad-Djafari | Dirichlet or Potts ? | 10 pages. This work will be presented at MaxEnt07:
http://www.maxent07.org | null | 10.1063/1.3039000 | null | physics.data-an | null | When modeling the distribution of a set of data by a mixture of Gaussians,
there are two possibilities: i) the classical one is using a set of parameters
which are the proportions, the means and the variances; ii) the second is to
consider the proportions as the probabilities of a discrete valued hidden
variable. In the first case a usual prior distribution for the proportions is
the Dirichlet which accounts for the fact that they have to sum up to one. In
the second case, to each data is associated a hidden variable for which we
consider two possibilities: a) assuming those variables to be i.i.d. We show
then that this scheme is equivalent to the classical mixture model with
Dirichlet prior; b) assuming a Markovian structure. Then we choose the simplest
markovian model which is the Potts distribution. As we will see this model is
more appropriate for the case where the data represents the pixels of an image
for which the hidden variables represent a segmentation of that image. The main
object of this paper is to give some details on these models and different
algorithms used for their simulation and the estimation of their parameters.
Key Words: Mixture of Gaussians, Dirichlet, Potts, Classification,
Segmentation.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:24:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mohammad-Djafari",
"Ali",
""
]
] |
0705.2451 | Pavlo Pylyavskyy | Denis Chebikin, Richard Ehrenborg, Pavlo Pylyavskyy, Margaret Readdy | Cyclotomic factors of the descent set polynomial | 21 pages, revised the proof of the opening result and cleaned up
notation | Journal of Combinatorial Theory Series A 116 (2009), no. 2,
247--264 | 10.1016/j.jcta.2008.05.011 | null | math.CO | null | We introduce the notion of the descent set polynomial as an alternative way
of encoding the sizes of descent classes of permutations. Descent set
polynomials exhibit interesting factorization patterns. We explore the question
of when particular cyclotomic factors divide these polynomials. As an instance
we deduce that the proportion of odd entries in the descent set statistics in
the symmetric group S_n only depends on the number on 1's in the binary
expansion of n. We observe similar properties for the signed descent set
statistics.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:27:49 GMT"
},
{
"version": "v2",
"created": "Sat, 3 May 2008 00:34:24 GMT"
}
] | 2017-05-30T00:00:00 | [
[
"Chebikin",
"Denis",
""
],
[
"Ehrenborg",
"Richard",
""
],
[
"Pylyavskyy",
"Pavlo",
""
],
[
"Readdy",
"Margaret",
""
]
] |
0705.2452 | Jai Sukhatme | Jai Sukhatme and Leslie M. Smith | Vortical and Wave Modes in 3D Rotating Stratified Flows: Random Large
Scale Forcing | 18 pages, 6 figs. (abbreviated abstract) | null | 10.1080/03091920801915318 | null | physics.flu-dyn physics.ao-ph | null | Utilizing an eigenfunction decomposition, we study the growth and spectra of
energy in the vortical and wave modes of a 3D rotating stratified fluid as a
function of $\epsilon = f/N$. Working in regimes characterized by moderate
Burger numbers, i.e. $Bu = 1/\epsilon^2 < 1$ or $Bu \ge 1$, our results
indicate profound change in the character of vortical and wave mode
interactions with respect to $Bu = 1$. As with the reference state of
$\epsilon=1$, for $\epsilon < 1$ the wave mode energy saturates quite quickly
and the ensuing forward cascade continues to act as an efficient means of
dissipating ageostrophic energy. Further, these saturated spectra steepen as
$\epsilon$ decreases: we see a shift from $k^{-1}$ to $k^{-5/3}$ scaling for
$k_f < k < k_d$ (where $k_f$ and $k_d$ are the forcing and dissipation scales,
respectively). On the other hand, when $\epsilon > 1$ the wave mode energy
never saturates and comes to dominate the total energy in the system. In fact,
in a sense the wave modes behave in an asymmetric manner about $\epsilon = 1$.
With regard to the vortical modes, for $\epsilon \le 1$, the signatures of 3D
quasigeostrophy are clearly evident. Specifically, we see a $k^{-3}$ scaling
for $k_f < k < k_d$ and, in accord with an inverse transfer of energy, the
vortical mode energy never saturates but rather increases for all $k < k_f$. In
contrast, for $\epsilon > 1$ and increasing, the vortical modes contain a
progressively smaller fraction of the total energy indicating that the 3D
quasigeostrophic subsystem plays an energetically smaller role in the overall
dynamics.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:39:51 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 19:52:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sukhatme",
"Jai",
""
],
[
"Smith",
"Leslie M.",
""
]
] |
0705.2453 | Carlo Luciano Bianco | Remo Ruffini, Maria Grazia Bernardini, Carlo Luciano Bianco, Pascal
Chardonnet, Federico Fraschetti, Roberto Guida, She-Sheng Xue | GRB 050315: A step toward the uniqueness of the overall GRB structure
and the true nature of long GRBs | 6 pages, 2 figures, to appear in the proceedings of "Swift and GRBs",
Venice, 2006, Il Nuovo Cimento, in press | Nuovo Cim. 121B (2006) 1367-1372 | null | null | astro-ph | null | Using the Swift data of GRB 050315, we progress on the uniqueness of our
theoretically predicted Gamma-Ray Burst (GRB) structure as composed by a
proper-GRB (P-GRB), emitted at the transparency of an electron-positron plasma
with suitable baryon loading, and an afterglow comprising the so called "prompt
emission" as due to external shocks. Thanks to the Swift observations, we can
theoretically fit detailed light curves for selected energy bands on a
continuous time scale ranging over 10^6 seconds. The theoretically predicted
instantaneous spectral distribution over the entire afterglow confirms a clear
hard-to-soft behavior encompassing, continuously, the "prompt emission" all the
way to the latest phases of the afterglow. Consequences of the instrumental
threshold on the definition of "short" and "long" GRBs are discussed.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:37:20 GMT"
}
] | 2007-09-24T00:00:00 | [
[
"Ruffini",
"Remo",
""
],
[
"Bernardini",
"Maria Grazia",
""
],
[
"Bianco",
"Carlo Luciano",
""
],
[
"Chardonnet",
"Pascal",
""
],
[
"Fraschetti",
"Federico",
""
],
[
"Guida",
"Roberto",
""
],
[
"Xue",
"She-Sheng",
""
]
] |
0705.2454 | Ali Mohammad-Djafari | Ali Mohammad-Djafari | Non Gaussianity and Non Stationarity modeled through Hidden Variables
and their use in ICA and Blind Source Separation | 8 pages. This paper is submitted to ICA2007 | null | null | null | physics.data-an | null | Modeling non Gaussian and non stationary signals and images has always been
one of the most important part of signal and image processing methods. In this
paper, first we propose a few new models, all based on using hidden variables
for modeling either stationary but non Gaussian or Gaussian but non stationary
or non Gaussian and non stationary signals and images. Then, we will see how to
use these models in independent component analysis (ICA) or blind source
separation (BSS). The computational aspects of the Bayesian estimation
framework associated with these prior models are also discussed.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:43:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mohammad-Djafari",
"Ali",
""
]
] |
0705.2455 | L. C. Garcia de Andrade | L. . Garcia de Andrade | Dynamos and anti-dynamos as thin magnetic flux ropes in Riemannian
spaces | null | null | null | null | astro-ph | null | Two examples of magnetic anti-dynamos in magnetohydrodynamics (MHD) are
given. The first is a 3D metric conformally related to Arnold cat fast dynamo
metric: ${ds_{A}}^{2}=e^{-{\lambda}z}dp^{2}+e^{{\lambda}z}dq^{2}+dz^{2}$ is
shown to present a behaviour of non-dynamos where the magnetic field
exponentially decay in time. The curvature decay as z-coordinates increases
without bounds. Some of the Riemann curvature components such as $R_{pzpz}$
also undergoes dissipation while component $R_{qzqz}$ increases without bounds.
The remaining curvature component $R_{pqpq}$ is constant on the torus surface.
The other anti-dynamo which may be useful in plasma astrophysics is the thin
magnetic flux rope or twisted magnetic thin flux tube which also behaves as
anti-dynamo since it also decays with time. This model is based on the
Riemannian metric of the magnetic twisted flux tube where the axis possesses
Frenet curvature and torsion. Since in this last example the Frenet torsion of
the axis of the rope is almost zero, or the possible dynamo is almost planar it
satisfies Zeldovich theorem which states that planar dynamos do not exist.
Changing in topology of this result may result on a real dynamo as discussed.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 22:58:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"de Andrade",
"L. . Garcia",
""
]
] |
0705.2456 | Carlo Luciano Bianco | Remo Ruffini, Maria Grazia Bernardini, Carlo Luciano Bianco, Letizia
Caito, Pascal Chardonnet, Maria Giovanna Dainotti, Federico Fraschetti,
Roberto Guida, Gregory Vereshchagin, She-Sheng Xue | The role of GRB 031203 in clarifying the astrophysical GRB scenario | 8 pages, 11 figures, to appears in the proceedings of "The 6th
INTEGRAL Workshop - The Obscured Universe", Moscow, 2006, ESA Special
Publication, SP-622, in press | null | null | null | astro-ph | null | The luminosity and the spectral distribution of the afterglow of GRB 031203
have been presented within our theoretical framework, which envisages the GRB
structure as composed by a proper-GRB, emitted at the transparency of an
electron-positron plasma with suitable baryon loading, and an afterglow
comprising the "prompt emission" as due to external shocks. In addition to the
GRB emission, there appears to be a prolonged soft X-Ray emission lasting for
10^6-10^7 seconds followed by an exponential decay. This additional source has
been called by us URCA-3. It is urgent to establish if this component is
related to the GRB or to the Supernova (SN). In this second case, there are two
possibilities: either the interaction of the SN ejecta with the interstellar
medium or, possibly, the cooling of a young neutron star formed in the SN
2003lw process. The analogies and the differences between this triptych GRB
031203 / SN 2003lw / URCA-3 and the corresponding ones GRB 980425 / SN 1998bw /
URCA-1 and GRB 030329 / SN 2003dh / URCA-2, as well as GRB 060218 / SN 2006aj
are discussed.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 23:00:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ruffini",
"Remo",
""
],
[
"Bernardini",
"Maria Grazia",
""
],
[
"Bianco",
"Carlo Luciano",
""
],
[
"Caito",
"Letizia",
""
],
[
"Chardonnet",
"Pascal",
""
],
[
"Dainotti",
"Maria Giovanna",
""
],
[
"Fraschetti",
"Federico",
""
],
[
"Guida",
"Roberto",
""
],
[
"Vereshchagin",
"Gregory",
""
],
[
"Xue",
"She-Sheng",
""
]
] |
0705.2457 | Jonathan J. Fortney | Jonathan J. Fortney and Mark S. Marley | Analysis of Spitzer Spectra of Irradiated Planets: Evidence for Water
Vapor? | Revised, Accepted to ApJ Letters | null | 10.1086/521603 | null | astro-ph | null | Published mid infrared spectra of transiting planets HD 209458b and HD
189733b, obtained during secondary eclipse by the InfraRed Spectrograph (IRS)
aboard the Spitzer Space Telescope, are predominantly featureless. In
particular these flux ratio spectra do not exhibit an expected feature arising
from water vapor absorption short-ward of 10 um. Here we suggest that, in the
absence of flux variability, the spectral data for HD 189733b are inconsistent
with 8 um-photometry obtained with Spitzer's InfraRed Array Camera (IRAC),
perhaps an indication of problems with the challenging reduction of the IRS
spectra. The IRAC point, along with previously published secondary eclipse
photometry for HD 189733b, are in good agreement with a one-dimensional model
of HD 189733b that clearly shows absorption due to water vapor in the emergent
spectrum. We are not able to draw firm conclusions regarding the IRS data for
HD 209458b, but spectra predicted by 1D and 3D atmosphere models fit the data
adequately, without adjustment of the water abundance or reliance on cloud
opacity. We argue that the generally good agreement between model spectra and
IRS spectra of brown dwarfs with atmospheric temperatures similar to these
highly irradiated planets lends confidence in the modeling procedure.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 23:05:19 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jul 2007 15:37:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fortney",
"Jonathan J.",
""
],
[
"Marley",
"Mark S.",
""
]
] |
0705.2458 | Jason Gallas | Cristian Bonatto and Jason A.C. Gallas | Accumulation horizons and period-adding in optically injected
semiconductor lasers | 4 pages, 4 figures, laser phase diagrams, to appear in Phys. Rev. E,
vol. 75 | null | 10.1103/PhysRevE.75.055204 | null | physics.optics physics.comp-ph | null | We study the hierarchical structuring of islands of stable periodic
oscillations inside chaotic regions in phase diagrams of single-mode
semiconductor lasers with optical injection. Phase diagrams display remarkable
{\it accumulation horizons}: boundaries formed by the accumulation of infinite
cascades of self-similar islands of periodic solutions of ever-increasing
period. Each cascade follows a specific period-adding route. The riddling of
chaotic laser phases by such networks of periodic solutions may compromise
applications operating with chaotic signals such as e.g. secure communications.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 23:58:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bonatto",
"Cristian",
""
],
[
"Gallas",
"Jason A. C.",
""
]
] |
0705.2459 | Ali Mohammad-Djafari | Ali Mohammad-Djafari, Adel Mohammadpoor and Nadia Bali | Hierarchical Markovian models for hyperspectral image segmentation | 4 pages double column. This paper has been presented at ICPR06 | null | null | null | physics.data-an | null | Hyperspectral images can be represented either as a set of images or as a set
of spectra. Spectral classification and segmentation and data reduction are the
main problems in hyperspectral image analysis. In this paper we propose a
Bayesian estimation approach with an appropriate hiearchical model with hidden
markovian variables which gives the possibility to jointly do data reduction,
spectral classification and image segmentation. In the proposed model, the
desired independent components are piecewise homogeneous images which share the
same common hidden segmentation variable. Thus, the joint Bayesian estimation
of this hidden variable as well as the sources and the mixing matrix of the
source separation problem gives a solution for all the three problems of
dimensionality reduction, spectra classification and segmentation of
hyperspectral images. A few simulation results illustrate the performances of
the proposed method compared to other classical methods usually used in
hyperspectral image processing.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 00:35:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mohammad-Djafari",
"Ali",
""
],
[
"Mohammadpoor",
"Adel",
""
],
[
"Bali",
"Nadia",
""
]
] |
0705.2460 | Makoto Katori | Makoto Katori and Hideki Tanemura | Noncolliding Brownian Motion and Determinantal Processes | v3: LaTeX, 43 pages, no figure, minor corrections made for
publication in J. Stat. Phys | J. Stat. Phys. 129 (2007) 1233-1277 | 10.1007/s10955-007-9421-y | null | math.PR cond-mat.stat-mech hep-th math-ph math.MP nlin.SI | null | A system of one-dimensional Brownian motions (BMs) conditioned never to
collide with each other is realized as (i) Dyson's BM model, which is a process
of eigenvalues of hermitian matrix-valued diffusion process in the Gaussian
unitary ensemble (GUE), and as (ii) the $h$-transform of absorbing BM in a Weyl
chamber, where the harmonic function $h$ is the product of differences of
variables (the Vandermonde determinant). The Karlin-McGregor formula gives
determinantal expression to the transition probability density of absorbing BM.
We show from the Karlin-McGregor formula, if the initial state is in the
eigenvalue distribution of GUE, the noncolliding BM is a determinantal process,
in the sense that any multitime correlation function is given by a determinant
specified by a matrix-kernel. By taking appropriate scaling limits, spatially
homogeneous and inhomogeneous infinite determinantal processes are derived. We
note that the determinantal processes related with noncolliding particle
systems have a feature in common such that the matrix-kernels are expressed
using spectral projections of appropriate effective Hamiltonians. On the common
structure of matrix-kernels, continuity of processes in time is proved and
general property of the determinantal processes is discussed.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 00:48:36 GMT"
},
{
"version": "v2",
"created": "Sat, 1 Sep 2007 00:29:19 GMT"
},
{
"version": "v3",
"created": "Mon, 12 Nov 2007 01:24:42 GMT"
}
] | 2007-11-29T00:00:00 | [
[
"Katori",
"Makoto",
""
],
[
"Tanemura",
"Hideki",
""
]
] |
0705.2461 | Ali Mohammad-Djafari | Feng Su and Ali Mohammad-Djafari | Bayesian Separation of Document Images with Hidden Markov Model | 6 pages double column. This paper has been presented at VISAPP07 | null | null | null | physics.data-an | null | this paper we consider the problem of separating noisy instantaneous linear
mixtures of document images in the Bayesian framework. The source image is
modeled hierarchically by a latent labeling process representing the common
classifications of document objects among different color channels and the
intensity process of pixels given the class labels. A Potts Markov random field
is used to model regional regularity of the classification labels inside object
regions. Local dependency between neighboring pixels can also be accounted by
smoothness constraint on their intensities. Within the Bayesian approach, all
unknowns including the source, the classification, the mixing coefficients and
the distribution parameters of these variables are estimated from their
posterior laws. The corresponding Bayesian computations are done by MCMC
sampling algorithm. Results from experiments on synthetic and real image
mixtures are presented to illustrate the performance of the proposed method.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 00:56:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Su",
"Feng",
""
],
[
"Mohammad-Djafari",
"Ali",
""
]
] |
0705.2462 | Richard Lieu | Richard Lieu | $\Lambda$CDM cosmology: how much suppression of credible evidence, and
does the model really lead its competitors, using all evidence? | 14 pages, 3 figures and 3 tables | null | null | null | astro-ph | null | Astronomy can never be a hard core physics discipline, because the Universe
offers no control experiment, i.e. with no independent checks it is bound to be
highly ambiguous and degenerate. Thus e.g. while superluminal motion can be
explained by Special Relativity. data on the former can never on their own be
used to establish the latter. This is why traditionally astrophysicists have
been content with (and proud of) their ability to use known physical laws and
processes established in the laboratory to explain celestial phenomena.
Cosmology is not even astrophysics: all the principal assumptions in this field
are unverified (or unverifiable) in the laboratory, and researchers are quite
comfortable with inventing unknowns to explain the unknown. How then could,
after fifty years of failed attempt in finding dark matter, the fields of dark
matter {\it and now} dark energy have become such lofty priorities in astronomy
funding, to the detriment of all other branches of astronomy? I demonstrate in
this article that while some of is based upon truth, at least just as much of
$\Lambda$CDM cosmology has been propped by a paralyzing amount of propaganda
which suppress counter evidence and subdue competing models. The recent WMAP3
paper of Spergel et al (2007) will be used as case in point on selective
citation. I also show that when all evidence are taken into account, two of the
competing models that abolish dark energy and/or dark matter do not trail
behind $\Lambda$CDM by much. Given all of the above, I believe astronomy is no
longer heading towards a healthy future, unless funding agencies re-think their
master plans by backing away from such high a emphasis on groping in the dark.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 13:21:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lieu",
"Richard",
""
]
] |
0705.2463 | Peter Prinsen | Peter Prinsen and Theo Odijk | Collective diffusion coefficient of proteins with hydrodynamic,
electrostatic and adhesive interactions | 8 pages, 3 figures, 1 table | null | 10.1063/1.2771160 | null | cond-mat.soft cond-mat.other | null | A theory is presented for lambda_C, the coefficient of the first-order
correction in the density of the collective diffusion coefficient, for protein
spheres interacting by electrostatic and adhesive forces. An extensive
numerical analysis of the Stokesian hydrodynamics of two moving spheres is
given so as to gauge the precise impact of lubrication forces. An effective
stickiness is introduced and a simple formula for lambda_C in terms of this
variable is put forward. A precise though more elaborate approximation for
lambda_C is also developed. These and numerically exact expressions for
lambda_C are compared with experimental data on lysozyme at pH 4.5 and a range
of ionic strengths between 0.05 M and 2 M.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 01:49:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Prinsen",
"Peter",
""
],
[
"Odijk",
"Theo",
""
]
] |
0705.2464 | Grzegorz Kowal | Grzegorz Kowal and A. Lazarian | Scaling Relations of Compressible MHD Turbulence | 4 pages, 5 figures | null | 10.1086/521788 | null | astro-ph | null | We study scaling relations of compressible strongly magnetized turbulence. We
find a good correspondence of our results with the Fleck (1996) model of
compressible hydrodynamic turbulence. In particular, we find that the
density-weighted velocity, i.e. $u \equiv \rho^{1/3} v$, proposed in Kritsuk et
al. (2007) obeys the Kolmogorov scaling, i.e. $E_{u}(k)\sim k^{-5/3}$ for the
high Mach number turbulence. Similarly, we find that the exponents of the third
order structure functions for $u$ stay equal to unity for the all the Mach
numbers studied. The scaling of higher order correlations obeys the She-Leveque
(1994) scalings corresponding to the two-dimensional dissipative structures,
and this result does not change with the Mach number either. In contrast to $v$
which exhibits different scaling parallel and perpendicular to the local
magnetic field, the scaling of $u$ is similar in both directions. In addition,
we find that the peaks of density create a hierarchy in which both physical and
column densities decrease with the scale in accordance to the Fleck (1996)
predictions. This hierarchy can be related ubiquitous small ionized and neutral
structures (SINS) in the interstellar gas. We believe that studies of
statistics of the column density peaks can provide both consistency check for
the turbulence velocity studies and insight into supersonic turbulence, when
the velocity information is not available.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 01:40:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kowal",
"Grzegorz",
""
],
[
"Lazarian",
"A.",
""
]
] |
0705.2465 | Molin Liu | Molin Liu, Hongya Liu, Feng luo and Lixin Xu | The Real Solution to Scalar Field Equation in 5D Black String Space | 10 pages, 6 figures. To appear in Gen. Rel. Grav | Gen.Rel.Grav.39:1389-1402,2007 | 10.1007/s10714-007-0442-2 | null | gr-qc astro-ph hep-ph | null | After the nontrivial quantum parameters $\Omega_{n}$ and quantum potentials
$V_{n}$ obtained in our previous research, the circumstance of a real scalar
wave in the bulk is studied with the similar method of Brevik (2001). The
equation of a massless scalar field is solved numerically under the boundary
conditions near the inner horizon $r_{e}$ and the outer horizon $r_{c}$. Unlike
the usual wave function $\Psi_{\omega l}$ in 4D, quantum number $n$ introduces
a new functions $\Psi_{\omega l n}$, whose potentials are higher and wider with
bigger n. Using the tangent approximation, a full boundary value problem about
the Schr$\ddot{o}$dinger-like equation is solved. With a convenient replacement
of the 5D continuous potential by square barrier, the reflection and
transmission coefficients are obtained. If extra dimension does exist and is
visible at the neighborhood of black holes, the unique wave function
$\Psi_{\omega l n}$ may say something to it.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 01:26:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Liu",
"Molin",
""
],
[
"Liu",
"Hongya",
""
],
[
"luo",
"Feng",
""
],
[
"Xu",
"Lixin",
""
]
] |
0705.2466 | Aleksei Mikhailov Alekseevich | A.A. Mikhailov | Analysis of the Arrival Directions of Ultrahigh Energy Cosmic Rays | 4 pages, 4 figures, PDF, a contributed paper presented to 30-th ICRC,
Merida, Nexico, 2007 | Pre-conference ICRC 2007 proc., HE 1.4A, el.-disc | null | null | astro-ph | null | The arrival directions of ultrahigh energy extensive air showers (EAS) by
Yakutsk, AGASA and SUGAR array data are considered. For the first time, the
maps of equal exposition of celestial sphere for the distribution of particles
by AGASA and SUGAR array data have been constructed. The large-scale anisotropy
of E>4.10^19 eV cosmic rays from the side of Input and Output of the Galaxy
Local Arm by Yakutsk, AGASA and SUGAR array data has been detected. The problem
of cosmic ray origin is discussed.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 01:32:43 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Mikhailov",
"A. A.",
""
]
] |
0705.2467 | Terry Gannon | P. Bantay and T. Gannon | Vector-valued modular functions for the modular group and the
hypergeometric equation | 20 pages, latex | null | null | null | math.NT hep-th | null | A general theory of vector-valued modular functions, holomorphic in the upper
half-plane, is presented for finite dimensional representations of the modular
group. This also provides a description of vector-valued modular forms of
arbitrary half-integer weight. It is shown that the space of these modular
functions is spanned, as a module over the polynomials in J, by the columns of
a matrix that satisfies an abstract hypergeometric equation, providing a simple
solution of the Riemann-Hilbert problem for representations of the modular
group. Restrictions on the coefficients of this differential equation implied
by analyticity are discussed, and an inversion formula is presented that allows
the determination of an arbitrary vector-valued modular function from its
singular behavior. Questions of rationality and positivity of expansion
coefficients are addressed. Closed expressions for the number of vector-valued
modular forms of half-integer weight are given, and the general theory is
illustrated on simple examples.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 01:56:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bantay",
"P.",
""
],
[
"Gannon",
"T.",
""
]
] |
0705.2468 | Aziz Kolkiran | Aziz Kolkiran and G S Agarwal | Heisenberg limited Sagnac interferometry | 11 pages, 5 figures | Optics Express 15, 6798 (2007) | 10.1364/OE.15.006798 | null | quant-ph | null | We show how the entangled photons produced in parametric down conversion can
be used to improve the sensitivity of a Sagnac interferometer. Two-photon and
four-photon coincidences increases the sensitivity by a factor of two and four
respectively. Our results apply to sources with arbitrary pumping and squeezing
parameters.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 02:08:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kolkiran",
"Aziz",
""
],
[
"Agarwal",
"G S",
""
]
] |
0705.2469 | Rong-Gen Cai | Rong-Gen Cai, Sang Pyo Kim, Bin Wang | Ricci Flat Black Holes and Hawking-Page Phase Transition in Gauss-Bonnet
Gravity and Dilaton Gravity | Latex, 17 pages without figures | Phys.Rev.D76:024011,2007 | 10.1103/PhysRevD.76.024011 | null | hep-th gr-qc | null | It is well-known that there exists a Hawking-Page phase transition between a
spherical AdS black hole and a thermal AdS space. The phase transition does not
happen between a Ricci flat AdS black hole whose horizon is a Ricci flat space
and a thermal AdS space in the Poincare coordinates. However, the Hawking-Page
phase transition occurs between a Ricci flat AdS black hole and an AdS soliton
if at least one of horizon coordinates for the Ricci flat black hole is
compact. We show a similar phase transition betwen the Ricci flat black holes
and deformed AdS solitons in the Gauss-Bonnet gravity and the dilaton gravity
with a Liouville-type potential including the gauged supergravity coming from
the spherical reduction of Dp-branes in type II supergravity. In contrast to
Einstein gravity, we find that the high temperature phase can be dominated
either by black holes or deformed AdS solitons depending on parameters.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 02:51:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Kim",
"Sang Pyo",
""
],
[
"Wang",
"Bin",
""
]
] |
0705.2470 | Hai-Xia Zhang | H. X. Zhang, M. Zhang and Z. Y. Zhang (Institute of High Energy
Physics, Beijing, China) | $Qq\bar Q\bar q'$ States in Chiral SU(3) Quark Model | null | Chin.Phys.Lett.24:2533-2536,2007 | 10.1088/0256-307X/24/9/019 | null | hep-ph | null | In this work, we study the masses of $Qq\bar Q\bar q'$ states with
J^{PC}=0^{++}, 1^{++}, 1^{+-} and 2^{++} in the chiral SU(3) quark model, where
Q is the heavy quark (c or b) and q (q') is the light quark (u, d or s).
According to our numerical results, it is improbable to make the interpretation
of $[cn\bar c\bar n]_{1^{++}}$ and $[cn\bar c\bar n]_{2^{++}}$ (n=u, d) states
as X(3872) and Y(3940), respectively. However, it is interesting to find the
tetraquarks in the $bq\bar b\bar q'$ system.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 02:38:41 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Jun 2007 06:40:32 GMT"
},
{
"version": "v3",
"created": "Wed, 1 Aug 2007 01:52:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zhang",
"H. X.",
"",
"Institute of High Energy\n Physics, Beijing, China"
],
[
"Zhang",
"M.",
"",
"Institute of High Energy\n Physics, Beijing, China"
],
[
"Zhang",
"Z. Y.",
"",
"Institute of High Energy\n Physics, Beijing, China"
]
] |
0705.2471 | Andjelo Samsarov | S. Meljanac, A. Samsarov, M. Stojic, K. S. Gupta | Kappa-Minkowski space-time and the star product realizations | 23 pages, revtex4, no figures, typos corrected, references added; in
v3 few references and some comments regarding kappa-Poincare symmetry are
included; to appear in EPJC | Eur.Phys.J.C53:295-309,2008 | 10.1140/epjc/s10052-007-0450-0 | null | hep-th | null | We investigate a Lie algebra-type $ \kappa$-deformed Minkowski space-time
with undeformed Lorentz algebra and mutually commutative vector-like Dirac
derivatives. There are infinitely many realizations of $ \kappa$-Minkowski
space. The coproduct and the star product corresponding to each of them are
found. Utilizing the properties of the {\em{natural}} realization, we construct
a scalar field theory on $ \kappa$-deformed Minkowski space and show that it is
equivalent to the scalar, nonlocal, relativistically invariant field theory on
the ordinary Minkowski space.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 03:04:01 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Jun 2007 22:52:22 GMT"
},
{
"version": "v3",
"created": "Wed, 24 Oct 2007 14:29:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Meljanac",
"S.",
""
],
[
"Samsarov",
"A.",
""
],
[
"Stojic",
"M.",
""
],
[
"Gupta",
"K. S.",
""
]
] |
0705.2472 | Jun-Hong An | Jun-Hong An, Mang Feng, and Wei-Min Zhang | Non-Markovian decoherence dynamics of entangled coherent states | 10 pages, 3 figures. The Markovian limit of the derived non-Markovian
master equation is added. Also the numerical results of comparing the
non-Markovian with Markovian decoherence dynamics of the entangled coherent
states are added | Quantum Information & Computation 9, 0317 (2009) | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We microscopically model the decoherence dynamics of entangled coherent
states under the influence of vacuum fluctuation. We derive an exact master
equation with time-dependent coefficients reflecting the memory effect of the
environment, by using the Feynman-Vernon influence functional theory in the
coherent-state representation. Under the Markovian approximation, our master
equation recovers the widely used Lindblad equation in quantum optics. We then
investigate the non-Markovian entanglement dynamics of the quantum channel in
terms of the entangled coherent states under noise. Compared with the results
in Markovian limit, it shows that the non-Markovian effect enhances the
disentanglement to the initially entangled coherent state. Our analysis also
shows that the decoherence behaviors of the entangled coherent states depend
sensitively on the symmetrical properties of the entangled coherent states as
well as the interactions between the system and the environment.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 03:16:16 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Dec 2007 07:00:11 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Jun 2009 09:11:34 GMT"
}
] | 2009-06-02T00:00:00 | [
[
"An",
"Jun-Hong",
""
],
[
"Feng",
"Mang",
""
],
[
"Zhang",
"Wei-Min",
""
]
] |
0705.2473 | Yasu Takano | H. Tsujii, C. R. Rotundu, T. Ono, H. Tanaka, B. Andraka, K. Ingersent,
Y. Takano | Thermodynamics of the Up-Up-Down Phase of the S = 1/2 Triangular-Lattice
Antiferromagnet Cs$_2$CuBr$_4$ | 4 pages, 5 figures | Phys. Rev. B 76, 060406(R) (2007), with a few small changes | 10.1103/PhysRevB.76.060406 | null | cond-mat.str-el | null | Specific heat and the magnetocaloric effect are used to probe the
field-induced up-up-down phase of Cs2CuBr4, a quasi-two-dimensional spin-1/2
triangular antiferromagnet with near-maximal frustration. The shape of the
magnetic phase diagram shows that the phase is stabilized by quantum
fluctuations, not by thermal fluctuations as in the corresponding phase of
classical spins. The magnon gaps determined from the specific heat are
considerably larger than those expected for a Heisenberg antiferromagnet,
probably due to the presence of a small Dzyaloshinskii-Moriya interaction.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 03:24:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tsujii",
"H.",
""
],
[
"Rotundu",
"C. R.",
""
],
[
"Ono",
"T.",
""
],
[
"Tanaka",
"H.",
""
],
[
"Andraka",
"B.",
""
],
[
"Ingersent",
"K.",
""
],
[
"Takano",
"Y.",
""
]
] |
0705.2474 | Stefan Mashkevich | Stefan Mashkevich (Schrodinger, New York), St\'ephane Ouvry (LPTMS,
Orsay) | The Nonperiodic Anyon Model and the Fractional Quantum Hall Effect | 14 pages, 4 figures, LaTeX 2e | null | null | null | cond-mat.mes-hall cond-mat.str-el | null | The lowest-Landau-level anyon model becomes nonperiodic in the statistics
parameter when the finite size of the attached flux tubes is taken into
account. The finite-size effects cause the inverse proportional relation
between the critical filling factor and the statistics parameter to be
nonperiodically continued in the screening regime, where the fluxes are
anti-parallel to the external magnetic field -- at critical filling, the
external magnetic field is entirely screened by the mean magnetic field
associated with the flux tubes. A clustering argument is proposed to select
particular values of the statistics parameter. In this way, IQHE and FQHE
fillings are obtained in terms of gapped nondegenerate LLL-anyonic wave
functions. Jain's series are reproduced without the need to populate higher
Landau levels. New FQHE series are proposed, like, in particular, the
particle-hole complementary series of the Laughlin one. For fast-rotating
Bose-Einstein condensates, a corresponding clustering argument yields
particular fractional filling series.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 04:01:28 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mashkevich",
"Stefan",
"",
"Schrodinger, New York"
],
[
"Ouvry",
"Stéphane",
"",
"LPTMS,\n Orsay"
]
] |
0705.2475 | Hiroya Nakao | Hiroya Nakao, Kensuke Arai, and Yoji Kawamura | Noise-Induced Synchronization and Clustering in Ensembles of Uncoupled
Limit-Cycle Oscillators | 6 pages, 2 figures | Phys. Rev. Lett. 98, 184101 (2007) | 10.1103/PhysRevLett.98.184101 | null | nlin.AO | null | We study synchronization properties of general uncoupled limit-cycle
oscillators driven by common and independent Gaussian white noises. Using phase
reduction and averaging methods, we analytically derive the stationary
distribution of the phase difference between oscillators for weak noise
intensity. We demonstrate that in addition to synchronization, clustering, or
more generally coherence, always results from arbitrary initial conditions,
irrespective of the details of the oscillators.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 04:05:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Nakao",
"Hiroya",
""
],
[
"Arai",
"Kensuke",
""
],
[
"Kawamura",
"Yoji",
""
]
] |
0705.2476 | Masatoshi Sato | Masatoshi Sato | Topological Discrete Algebra, Ground State Degeneracy, and Quark
Confinement in QCD | 11 pages, 1 figure | Phys. Rev. D77, 045013 (2008) | 10.1103/PhysRevD.77.045013 | null | hep-th cond-mat.str-el hep-lat hep-ph | null | Based on the permutation group formalism, we present a discrete symmetry
algebra in QCD. The discrete algebra is hidden symmetry in QCD, which is
manifest only on a space-manifold with non-trivial topology. Quark confinement
in the presence of the dynamical quarks is discussed in terms of the discrete
symmetry algebra. It is shown that the quark deconfinement phase has the ground
state degeneracy depending on the topology of the space, which gives a
gauge-invariant distinction between the confinement and deconfinement phases.
We also point out that new quantum numbers relating to the fractional quantum
Hall effect exist in the deconfinement phase.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 04:49:30 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Sato",
"Masatoshi",
""
]
] |
0705.2477 | Feng Dai | Feng Dai and Yuan Xu | Ces\`aro means of orthogonal expansions in several variables | null | null | null | null | math.CA math.GM | null | Ces\`aro $(C,\delta)$ means are studied for orthogonal expansions with
respect to the weight function $\prod_{i=1}^{d}|x_i|^{2\k_i}$ on the unit
sphere, and for the corresponding weight functions on the unit ball and the
Jacobi weight on the simplex. A sharp pointwise estimate is established for the
$(C,\d)$ kernel with $\d > -1$ and for the kernel of the projection operator,
which allows us to derive the exact order for the norm of the
Ces\`aro means and the projection operator on these domains.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 05:20:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dai",
"Feng",
""
],
[
"Xu",
"Yuan",
""
]
] |
0705.2478 | Yong-Wan Kim | Yun Soo Myung, Yong-Wan Kim, and Young-Jai Park | Entropy of an extremal regular black hole | 17 Pages, 4 figures, version to appear in Phys. Lett. B | Phys.Lett.B659:832-838,2008 | 10.1016/j.physletb.2007.12.007 | null | gr-qc hep-th | null | We introduce a magnetically charged extremal regular black hole in the
coupled system of Einstein gravity and nonlinear electrodynamics. Its near
horizon geometry is given by $AdS_2\times S^2$. It turns out that the entropy
function approach does not automatically lead to a correct entropy of the
Bekenstein-Hawking entropy. This contrasts to the case of the extremal
Reissner-Norstr\"om black hole in the Einstein-Maxwell theory. We conclude that
the entropy function approach does not work for a magnetically charged extremal
regular black hole without singularity, because of the nonlinearity of the
entropy function.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 05:38:08 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Dec 2007 03:13:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Myung",
"Yun Soo",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] |
0705.2479 | Sergey Tertychniy | S.I.Tertychniy | General solution of overdamped Josephson junction equation in the case
of phase-lock | 28 pages | null | null | null | math-ph math.MP | null | The first order nonlinear ODE d phi(t)/d t + sin phi(t)=B+A cos(omega t),
(A,B,omega are real constants) is investigated. Its general solution is derived
in the case of the choice of parameters ensuring the phase-lock mode. It is
represented in terms of Floquet solution of double confluent Heun equation.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 05:43:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tertychniy",
"S. I.",
""
]
] |
0705.2480 | Mohamad Ali Jafarizadeh | M. A. Jafarizadeh, R. Sufiani, S. Jafarizadeh | Recursive calculation of effective resistances in distance-regular
networks based on Bose-Mesner algebra and Christoffel-Darboux identity | 37 pages, 3 figures | null | null | null | math.CO | null | Recently in \cite{jss1}, the authors have given a method for calculation of
the effective resistance (resistance distance) on distance-regular networks,
where the calculation was based on stratification introduced in \cite{js} and
Stieltjes transform of the spectral distribution (Stieltjes function)
associated with the network. Also, in Ref. \cite{jss1} it has been shown that
the resistance distances between a node $\alpha$ and all nodes $\beta$
belonging to the same stratum with respect to the $\alpha$
($R_{\alpha\beta^{(i)}}$, $\beta$ belonging to the $i$-th stratum with respect
to the $\alpha$) are the same. In this work, an algorithm for recursive
calculation of the resistance distances in an arbitrary distance-regular
resistor network is provided, where the derivation of the algorithm is based on
the Bose-Mesner algebra, stratification of the network, spectral techniques and
Christoffel-Darboux identity. It is shown that the effective resistance on a
distance-regular network is an strictly increasing function of the shortest
path distance defined on the network. In the other words, the two-point
resistance $R_{\alpha\beta^{(m+1)}}$ is strictly larger than
$R_{\alpha\beta^{(m)}}$. The link between the resistance distance and random
walks on distance-regular networks is discussed, where the average commute time
(CT) and its square root (called Euclidean commute time (ECT)) as a distance
are related to the effective resistance. Finally, for some important examples
of finite distance- regular networks, the resistance distances are calculated.
{\bf Keywords: resistance distance, association scheme, stratification,
distance-regular networks, Christoffel-Darboux identity}
{\bf PACs Index: 01.55.+b, 02.10.Yn}
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 05:32:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Jafarizadeh",
"M. A.",
""
],
[
"Sufiani",
"R.",
""
],
[
"Jafarizadeh",
"S.",
""
]
] |
0705.2481 | Hiroshi Yokoya | Hiroshi Yokoya | Single Longitudinal-Spin Asymmetries in Lepton-Pair Production at RHIC
and J-PARC | 7 pages PTPTex, 4 figures | Prog.Theor.Phys.118:371-376,2007 | 10.1143/PTP.118.371 | null | hep-ph | null | We study the single longitudinal-spin asymmetries in lepton-pair production
with large transverse-momentum at RHIC and J-PARC experiments. The asymmetries
in the azimuthal angular distribution of a lepton can arise from an absorptive
part of production amplitudes. We revisit the one-loop calculation for the
absorptive part of production amplitudes in perturbative QCD, and show that the
asymmetries can be sizable at RHIC and J-PARC. Measurement of the asymmetries
would test the one-loop prediction for the scattering phase of this process,
and provide support for a study of the single transverse-spin asymmetries in
the same kinematical region.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 05:48:35 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Yokoya",
"Hiroshi",
""
]
] |
0705.2482 | Alper Kiraz | A. Kiraz, A. Sennaroglu, S. Do\u{g}anay, M. A. D\"undar, A. Kurt, and
H. Kalayc{\i}o\u{g}lu, and A. L. Demirel | Lasing from single, stationary, dye-doped glycerol/water microdroplets
located on a superhydrophobic surface | to appear in Optics Communications | null | 10.1016/j.optcom.2007.04.026 | null | physics.optics | null | We report laser emission from single, stationary, Rhodamine B-doped
glycerol/water microdroplets located on a superhydrophobic surface. In the
experiments, a pulsed, frequency-doubled Nd:YAG laser operating at 532 nm was
used as the excitation source. The microdroplets ranged in diameter from a few
to 20 um. Lasing was achieved in the red-shifted portion of the dye emission
spectrum with threshold fluences as low as 750 J/cm2. Photobleaching was
observed when the microdroplets were pumped above threshold. In certain cases,
multimode lasing was also observed and attributed to the simultaneous lasing of
two modes belonging to different sets of whispering gallery modes.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 05:50:38 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Kiraz",
"A.",
""
],
[
"Sennaroglu",
"A.",
""
],
[
"Doğanay",
"S.",
""
],
[
"Dündar",
"M. A.",
""
],
[
"Kurt",
"A.",
""
],
[
"Kalaycıoğlu",
"H.",
""
],
[
"Demirel",
"A. L.",
""
]
] |
0705.2483 | Jean Savinien | Jean Savinien, Jean Bellissard | A Spectral Sequence for the K-theory of Tiling Spaces | 40pages, 1 figure | null | null | null | math.KT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $\Tt$ be an aperiodic and repetitive tiling of $\RM^d$ with finite local
complexity. We present a spectral sequence that converges to the $K$-theory of
$\Tt$ with $E_2$-page given by a new cohomology that will be called PV in
reference to the Pimsner-Voiculescu exact sequence. It is a generalization of
the Serre spectral sequence. The PV cohomology of $\Tt$ generalizes the
cohomology of the base space of a fibration with local coefficients in the
$K$-theory of its fiber. We prove that it is isomorphic to the \v{C}ech
cohomology of the hull of $\Tt$ (a compactification of the family of its
translates).
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 19:40:47 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Jun 2009 10:22:49 GMT"
}
] | 2009-06-05T00:00:00 | [
[
"Savinien",
"Jean",
""
],
[
"Bellissard",
"Jean",
""
]
] |
0705.2484 | Alexander E. Hramov | Alexey Koronovskii, Vladimir Ponomarenko, Mikhail Prokhorov, and
Alexander Hramov | Diagnostics of the Synchronization of Self-Oscillatory Systems by an
External Force with Varying Frequency with the Use of Wavelet Analysis | 11 pages, 9 figures | Journal of Communications Technology and Electronics, 52, 5 (2007)
544-554 | 10.1134/S1064226907050087 | null | nlin.CD physics.med-ph | null | A diagnostics method based on a continuous wavelet transform is proposed.
This method makes it possible to diagnose the presence of synchronization of
the oscillations of a self-excited oscillator locked by an external force with
a linearly modulated frequency and to distinguish such a situation from the
case when an external signal leaks into self-oscillations; i.e., the signals
are summed without a change in the self-oscillation frequency. The method's
efficiency is shown with the use of a Van der Pol generator and experimental
physiological data as examples.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 19:32:24 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Koronovskii",
"Alexey",
""
],
[
"Ponomarenko",
"Vladimir",
""
],
[
"Prokhorov",
"Mikhail",
""
],
[
"Hramov",
"Alexander",
""
]
] |
0705.2485 | Bodie Crossingham | Bodie Crossingham and Tshilidzi Marwala | Using Genetic Algorithms to Optimise Rough Set Partition Sizes for HIV
Data Analysis | 10 pages, 1 figure, Update Bibliography | null | null | null | cs.NE cs.AI q-bio.QM | null | In this paper, we present a method to optimise rough set partition sizes, to
which rule extraction is performed on HIV data. The genetic algorithm
optimisation technique is used to determine the partition sizes of a rough set
in order to maximise the rough sets prediction accuracy. The proposed method is
tested on a set of demographic properties of individuals obtained from the
South African antenatal survey. Six demographic variables were used in the
analysis, these variables are; race, age of mother, education, gravidity,
parity, and age of father, with the outcome or decision being either HIV
positive or negative. Rough set theory is chosen based on the fact that it is
easy to interpret the extracted rules. The prediction accuracy of equal width
bin partitioning is 57.7% while the accuracy achieved after optimising the
partitions is 72.8%. Several other methods have been used to analyse the HIV
data and their results are stated and compared to that of rough set theory
(RST).
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 07:02:23 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Crossingham",
"Bodie",
""
],
[
"Marwala",
"Tshilidzi",
""
]
] |
0705.2486 | Edward Frenkel | Boris Feigin and Edward Frenkel | Quantization of soliton systems and Langlands duality | 70 pages. Final version, to appear in Proceedings of the conference
in honor of A. Tsuchiya (Nagoya, March 2007), published in the series
Advanced Studies of Pure Mathematics | null | null | null | math.QA hep-th math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of quantization of classical soliton integrable
systems, such as the KdV hierarchy, in the framework of a general formalism of
Gaudin models associated to affine Kac--Moody algebras. Our experience with the
Gaudin models associated to finite-dimensional simple Lie algebras suggests
that the common eigenvalues of the mutually commuting quantum Hamiltonians in a
model associated to an affine algebra should be encoded by affine opers
associated to the Langlands dual affine algebra. This leads us to some concrete
predictions for the spectra of the quantum Hamiltonians of the soliton systems.
In particular, for the KdV system the corresponding affine opers may be
expressed as Schroedinger operators with spectral parameter, and our
predictions in this case match those recently made by Bazhanov, Lukyanov and
Zamolodchikov. This suggests that this and other recently found examples of the
correspondence between quantum integrals of motion and differential operators
may be viewed as special cases of the Langlands duality.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 18:09:03 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 22:06:38 GMT"
},
{
"version": "v3",
"created": "Sun, 9 Dec 2007 20:48:26 GMT"
},
{
"version": "v4",
"created": "Mon, 12 Oct 2009 20:45:45 GMT"
}
] | 2009-10-12T00:00:00 | [
[
"Feigin",
"Boris",
""
],
[
"Frenkel",
"Edward",
""
]
] |
0705.2487 | Pavel Exner | Pavel Exner and Petr \v{S}eba | A "hybrid plane" with spin-orbit interaction | LaTeX, 9 pages; in memoriam Vladimir A. Geyler (1943-2007) | Russ. J. Math. Phys. 14 (2007), 401-405 | 10.1134/S1061920807040085 | null | math-ph cond-mat.mes-hall math.MP math.SP quant-ph | null | In this paper we attempt to reconstruct one of the last projects of Volodya
Geyler which remained unfinished. We study motion of a quantum particle in the
plane to which a halfline lead is attached assuming that the particle has spin
$\frac12$ and the plane component of the Hamiltonian contains a spin-orbit
interaction of either Rashba or Dresselhaus type. We construct the class of
admissible Hamiltonians and derive an explicit expression for the Green
function applying it to the scattering in such a system.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 06:48:29 GMT"
}
] | 2019-12-10T00:00:00 | [
[
"Exner",
"Pavel",
""
],
[
"Šeba",
"Petr",
""
]
] |
0705.2488 | Sagar Chakraborty Mr. | Sagar Chakraborty and Partha Guha | On dynamics of velocity vector potential in incompressible fluids | The presentation has been improved compared to the previous
submission. More work has to be done before it could be considered a complete
work. Suggestions are most welcome | Physics Letters A, Volume 373, Issue 41, 5 October 2009, Pages
3764-3770 | null | null | physics.flu-dyn math-ph math.MP | null | An elegant quaternionic formulation is given for the Lagrangian advection
equation for velocity vector potential in fluid dynamics. At first we study the
topological significance of a restricted conserved quantity viz.,
stream-helicity and later more realistic configuration of open streamlines is
figured out. Also, using Clebsch parameterisation of the velocity vector
potential yet another physical significance for the stream-helicity is
provided. Finally we give a Nambu-Poisson formalism of the Lagrangian advection
equation for velocity vector potential.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 06:51:02 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 11:48:13 GMT"
}
] | 2009-10-06T00:00:00 | [
[
"Chakraborty",
"Sagar",
""
],
[
"Guha",
"Partha",
""
]
] |
0705.2489 | M'hammed El Kahoui | Moulay A. Barkatou, Hassan El Houari and M'hammed El Kahoui | Characterization of rank two locally nilpotent derivations in dimension
three | 9 pages; Maple implementation available under request | null | null | null | math.AC math.AG | null | In this paper we give an algorithmic characterization of rank two locally
nilpotent derivations in dimension three. Together with an algorithm for
computing the plinth ideal, this gives a method for computing the rank of a
locally nilpotent derivation in dimension three.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 07:09:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Barkatou",
"Moulay A.",
""
],
[
"Houari",
"Hassan El",
""
],
[
"Kahoui",
"M'hammed El",
""
]
] |
0705.2490 | Naresh Dadhich | Naresh Dadhich, Hideki Maeda | Origin of matter out of pure curvature | 8 pages, 1 Fig, Received Honorable Mention in 2007 GRF Essay
Competition, Summary of the talk given at Himalayan Relativity Dialogue at
Mirik, April 18-20, 2007 | Int.J.Mod.Phys.D17:513-518,2008 | 10.1142/S0218271808012188 | null | hep-th astro-ph gr-qc | null | We propose a mechanism for origin of matter in the universe in the framework
of Einstein-Gauss-Bonnet gravity in higher dimensions. The recently discovered
new static black hole solution by the authors \cite{md2006} with the
Kaluza-Klein split up of spacetime as a product of the usual ${\ma M}^4$ with a
space of negative constant curvature is indeed a pure gravitational creation of
a black hole which is also endowed with a Maxwell-like {\it gravitational
charge} in four-dimensional vacuum spacetime. Further it could be envisioned as
being formed from anti-de Sitter spacetime by collapse of radially inflowing
charged null dust. It thus establishes the remarkable reciprocity between
matter and gravity - as matter produces gravity (curvature), gravity too
produces matter.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 07:12:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dadhich",
"Naresh",
""
],
[
"Maeda",
"Hideki",
""
]
] |
0705.2491 | Kazuya Ishibashi | Kazuya Ishibashi, Kosuke Hamaguchi, and Masato Okada | Sparse and Dense Encoding in Layered Associative Network of Spiking
Neurons | null | null | 10.1143/JPSJ.76.124801 | null | q-bio.NC | null | A synfire chain is a simple neural network model which can propagate stable
synchronous spikes called a pulse packet and widely researched. However how
synfire chains coexist in one network remains to be elucidated. We have studied
the activity of a layered associative network of Leaky Integrate-and-Fire
neurons in which connection we embed memory patterns by the Hebbian Learning.
We analyzed their activity by the Fokker-Planck method. In our previous report,
when a half of neurons belongs to each memory pattern (memory pattern rate
$F=0.5$), the temporal profiles of the network activity is split into
temporally clustered groups called sublattices under certain input conditions.
In this study, we show that when the network is sparsely connected ($F<0.5$),
synchronous firings of the memory pattern are promoted. On the contrary, the
densely connected network ($F>0.5$) inhibit synchronous firings. The sparseness
and denseness also effect the basin of attraction and the storage capacity of
the embedded memory patterns. We show that the sparsely(densely) connected
networks enlarge(shrink) the basion of attraction and increase(decrease) the
storage capacity.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 07:18:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ishibashi",
"Kazuya",
""
],
[
"Hamaguchi",
"Kosuke",
""
],
[
"Okada",
"Masato",
""
]
] |
0705.2492 | M'hammed El Kahoui | Moulay A. Barkatou, Hassan El Houari and M'hammed El Kahoui | Triangulable locally nilpotent derivations in dimension three | 14 pages, Implementation available under request | null | null | null | math.AC math.AG | null | In this paper we give an algorithm to recognize triangulable locally
nilpotent derivations in dimension three. In case the given derivation is
triangulable, our method produces a coordinate system in which it exhibits a
triangular form.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 07:24:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Barkatou",
"Moulay A.",
""
],
[
"Houari",
"Hassan El",
""
],
[
"Kahoui",
"M'hammed El",
""
]
] |
0705.2493 | Seung-il Nam | Seung-il Nam and Hyun-Chul Kim | Kaon semileptonic decay (K_{l3}) form factor in the nonlocal chiral
quark model | Talk given at the international workshop, Hadronic and Nuclear
Physics (HNP07) on "Quarks in hadrons, nuclei, and matter", Busan, Korea, 22
- 24 Feb 2007 | null | null | PNU-NTG-05/2007, PNU-NuRI-05/2007 | hep-ph | null | We investigate the kaon semileptonic decay (K_{l3}) form factors within the
framework of the nonlocal chiral quark model from the instanton vacuum, taking
into account the effects of flavor SU(3) symmetry breaking. All theoretical
calculations are carried out without any adjustable parameter. We also show
that the present results satisfy the Callan-Treiman low-energy theorem as well
as the Ademollo-Gatto theorem. It turns out that the effects of flavor SU(3)
symmetry breaking are essential in reproducing the kaon semileptonic form
factors. The present results are in a good agreement with experiments, and are
compatible with other model calculations.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 07:47:14 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 01:31:34 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Nam",
"Seung-il",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] |
0705.2494 | Alexander Kamenshchik | Alexander Kamenshchik, Oleg Teryaev | Many-worlds interpretation of quantum theory and mesoscopic anthropic
principle | 11 pages | Concepts Phys.V:575-592,2008 | 10.2478/v10005-007-0045-4 | null | quant-ph | null | We suggest to combine the Anthropic Principle with Many-Worlds Interpretation
of Quantum Theory. Realizing the multiplicity of worlds it provides an
opportunity of explanation of some important events which are assumed to be
extremely improbable. The Mesoscopic Anthropic Principle suggested here is
aimed to explain appearance of such events which are necessary for emergence of
Life and Mind. It is complementary to Cosmological Anthropic Principle
explaining the fine tuning of fundamental constants. We briefly discuss various
possible applications of Mesoscopic Anthropic Principle including the Solar
Eclipses and assembling of complex molecules. Besides, we address the problem
of Time's Arrow in the framework of Many-World Interpretation. We suggest the
recipe for disentangling of quantities defined by fundamental physical laws and
by an anthropic selection.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 08:02:25 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Kamenshchik",
"Alexander",
""
],
[
"Teryaev",
"Oleg",
""
]
] |
0705.2495 | Ryushi Goto | Ryushi Goto | Deformations of generalized complex and generalized Kahler structures | 36 pages, minor changes, To appear in Journal of Differential
Geometry | J.Differential Geometry, vol 84,No.3, 2010,525-560 | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we obtain a stability theorem of generalized Kahler structures
with one pure spinor under small deformations of generalized complex
structures. (This is analogous to the stability theorem of Kahler manifolds by
Kodaira-Spencer.) We apply the stability theorem to a class of compact Kahler
manifolds which admits deformations to generalized complex manifolds and obtain
non-trivial generalized Kahler structures on Fano surfaces and toric Kahler
manifolds. In particular, we show that holomorphic Poisson structures on a
Kahler manifold induce deformations of generalized Kahler structures.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 08:12:46 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 08:46:28 GMT"
},
{
"version": "v3",
"created": "Tue, 17 Nov 2009 08:31:55 GMT"
}
] | 2010-09-21T00:00:00 | [
[
"Goto",
"Ryushi",
""
]
] |
0705.2496 | Christian Boehmer | C. G. Boehmer, T. Harko | Galactic dark matter as a bulk effect on the brane | 27 pages, 2 figures, accepted by CQG; reference added; Eq. (19)
corrected, references added, some typos corrected; | Class.Quant.Grav.24:3191-3210,2007 | 10.1088/0264-9381/24/13/004 | null | gr-qc astro-ph | null | The behavior of the angular velocity of a test particle moving in a stable
circular orbit in the vacuum on the brane is considered. In the brane world
scenario, the four dimensional effective Einstein equation acquire extra terms,
called dark radiation and dark pressure, respectively, which arise from the
embedding of the 3-brane in the bulk. A large number of independent
observations have shown that the rotational velocities of test particles
gravitating around galaxies tend, as a function of the distance from the
galactic center, toward constant values. By assuming a constant tangential
velocity, the general solution of the vacuum gravitational field equations on
the brane can be obtained in an exact analytic form. This allows us to obtain
the explicit form of the projections of the bulk Weyl tensor on the brane, and
the equation of state of the dark pressure as a function of the dark radiation.
The physical and geometrical quantities are expressed in terms of
observable/measurable parameters, like the tangential velocity, the baryonic
mass and the radius of the galaxy. We also analyze the dynamics of test
particles by using methods from the qualitative analysis of dynamical systems,
by assuming a simple linear equation of state for the dark pressure. The
obtained results provide a theoretical framework for the observational testing
at the extra-galactic scale of the predictions of the brane world models.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 08:20:56 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 12:19:56 GMT"
},
{
"version": "v3",
"created": "Sun, 10 Jun 2007 13:23:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Boehmer",
"C. G.",
""
],
[
"Harko",
"T.",
""
]
] |
0705.2497 | Hiroyasu Inoue Dr. | Hiroyasu Inoue, Wataru Souma, Schumpeter Tamada | Spatial Characteristics of Joint Application Networks in Japanese
Patents | null | null | 10.1016/j.physa.2007.04.096 | null | physics.soc-ph | null | Technological innovation has extensively been studied to make firms
sustainable and more competitive. Within this context, the most important
recent issue has been the dynamics of collaborative innovation among firms. We
therefore investigated a patent network, especially focusing on its spatial
characteristics. The results can be summarized as follows. (1) The degree
distribution in a patent network follows a power law. A firm can then be
connected to many firms via hubs connected to the firm. (2) The neighbors'
average degree has a null correlation, but the clustering coefficient has a
negative correlation. The latter means that there is a hierarchical structure
and bridging different modules may shorten the paths between the nodes in them.
(3) The distance of links not only indicates the regional accumulations of
firms, but the importance of time it takes to travel, which plays a key role in
creating links. (4) The ratio of internal links in cities indicates that we
have to consider the existing links firms have to facilitate the creation of
new links.
| [
{
"version": "v1",
"created": "Thu, 17 May 2007 08:32:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Inoue",
"Hiroyasu",
""
],
[
"Souma",
"Wataru",
""
],
[
"Tamada",
"Schumpeter",
""
]
] |
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