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sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.1330 | Pierre Parent | Pierre Parent, Andrei Yafaev | Proving the triviality of rational points on Atkin-Lehner quotients of
Shimura curves | 25 pages. To appear in Mathematische Annalen | null | null | null | math.NT | null | In this paper we give a method for studying global rational points on certain
quotients of Shimura curves by Atkin-Lehner involutions. We obtain explicit
conditions on such quotients for rational points to be ``trivial'' (coming from
CM points only) and exhibit an explicit infinite family of such quotients
satisfying these conditions.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 20:01:33 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Parent",
"Pierre",
""
],
[
"Yafaev",
"Andrei",
""
]
] |
0707.1331 | Winton Brown | Winton G. Brown, Lea F. Santos, David J. Starling, Lorenza Viola | Quantum Chaos, Delocalization, and Entanglement in Disordered Heisenberg
Models | 17 pages, 10 figures, revised version | Phys. Rev. E 77, 021106 (2008) | 10.1103/PhysRevE.77.021106 | null | quant-ph cond-mat.other | null | We investigate disordered one- and two-dimensional Heisenberg spin lattices
across a transition from integrability to quantum chaos from both a statistical
many-body and a quantum-information perspective. Special emphasis is devoted to
quantitatively exploring the interplay between eigenvector statistics,
delocalization, and entanglement in the presence of nontrivial symmetries. The
implications of basis dependence of state delocalization indicators (such as
the number of principal components) is addressed, and a measure of {\em
relative delocalization} is proposed in order to robustly characterize the
onset of chaos in the presence of disorder. Both standard multipartite and {\em
generalized entanglement} are investigated in a wide parameter regime by using
a family of spin- and fermion- purity measures, their dependence on
delocalization and on energy spectrum statistics being examined. A distinctive
{\em correlation between entanglement, delocalization, and integrability} is
uncovered, which may be generic to systems described by the two-body random
ensemble and may point to a new diagnostic tool for quantum chaos. Analytical
estimates for typical entanglement of random pure states restricted to a proper
subspace of the full Hilbert space are also established and compared with
random matrix theory predictions.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 20:04:29 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Feb 2008 16:11:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brown",
"Winton G.",
""
],
[
"Santos",
"Lea F.",
""
],
[
"Starling",
"David J.",
""
],
[
"Viola",
"Lorenza",
""
]
] |
0707.1332 | Pran Nath | Pran Nath and Raza M. Syed | Suppression of Higgsino mediated proton decay by cancellations in GUTs
and strings | 26 pages, no figures. Revtex 4. To appear in Physical Review D | Phys.Rev.D77:015015,2008 | 10.1103/PhysRevD.77.015015 | null | hep-ph | null | A mechanism for the enhancement for proton lifetime in
supersymmetric/supergravity (SUSY/SUGRA) grand unified theories (GUTs) and in
string theory models is discussed where Higgsino mediated proton decay arising
from color triplets (anti-triplets) with charges $Q=-1/3(1/3)$ and
$Q=-4/3(4/3)$ is suppressed by an internal cancellation due to contributions
from different sources. We exhibit the mechanism for an SU(5) model with
$45_H+\bar{45}_H$ Higgs multiplets in addition to the usual Higgs structure of
the minimal model. This model contains both $Q=-1/3(1/3)$ and $Q=-4/3(4/3)$
Higgs color triplets (anti-triplets) and simple constraints allow for a
complete suppression of Higgsino mediated proton decay. Suppression of proton
decay in an SU(5) model with Planck scale contributions is also considered. The
suppression mechanism is then exhibited for an SO(10) model with a unified
Higgs structure involving $144_H+\bar{144}_H$ representations.The SU(5)
decomposition of $144_H+\bar{144}_H$ contains $5_H+\bar 5_H$ and
$45_H+\bar{45}_H$ and the cancellation mechanism arises among these
contributions which mirrror the SU(5) case. The cancellation mechanism appears
to be more generally valid for a larger class of unification models.
Specifically the cancellation mechanism may play a role in string model
constructions to suppress proton decay from dimension five operators. The
mechanism allows for the suppression of proton decay consistent with current
data allowing for the possibility that proton decay may be visible in the next
round of nucleon stability experiment.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 20:06:10 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 20:36:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nath",
"Pran",
""
],
[
"Syed",
"Raza M.",
""
]
] |
0707.1333 | Joy Christian | Joy Christian (Perimeter and Oxford) | Disproof of Bell's Theorem: Further Consolidations | 11 pages; This is a followup to arXiv:quant-ph/0703179; see also
arXiv:quant-ph/0703244 | null | null | null | quant-ph gr-qc | null | The failure of Bell's theorem for Clifford algebra valued local variables is
further consolidated by proving that the conditions of remote parameter
independence and remote outcome independence are duly respected within the
recently constructed exact, local realistic model for the EPR-Bohm
correlations. Since the conjunction of these two conditions is equivalent to
the locality condition of Bell, this provides an independent geometric proof of
the local causality of the model, at the level of microstates. In addition to
local causality, the model respects at least seven other conceptual and
operational requirements, arising either from the predictions of quantum
mechanics or the premises of Bell's theorem, including the Malus's law for
sequential spin measurements. Since the agreement between the predictions of
the model and those of quantum mechanics is quantitatively precise in all
respects, the ensemble interpretation of the entangled singlet state becomes
amenable.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 19:38:11 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 20:09:58 GMT"
}
] | 2007-08-22T00:00:00 | [
[
"Christian",
"Joy",
"",
"Perimeter and Oxford"
]
] |
0707.1334 | Kelly Holley-Bockelmann | Kelly Holley-Bockelmann, Kayhan Gultekin, Deirdre Shoemaker, and Nico
Yunes | Gravitational Wave Recoil and the Retention of Intermediate Mass Black
Holes | 8 pages, 6 figures. Pick up high resolution version of figure 1 at
http://gravity.psu.edu/~kellyhb/kickfigures. Submitted to Astrophysical
Journal | null | 10.1086/591218 | null | astro-ph | null | During the inspiral and merger of a binary black hole, gravitational
radiation is emitted anisotropically due to asymmetries in the merger
configuration. This anisotropic radiation leads to a gravitational wave kick,
or recoil velocity, as large as ~ 4000 km/sec. We investigate the effect
gravitational recoil has on the retention of intermediate mass black holes
(IMBH) within Galactic globular clusters. Assuming that our current
understanding of IMBH-formation is correct and yields an IMBH-seed in every
globular cluster, we find a significant problem retaining low mass IMBHs (1000
$\Msun$) in the typical merger-rich globular cluster environment. Given a
uniform black hole spin distribution and orientation and a Kroupa IMF, we find
that at most 3% of the globular clusters can retain an IMBH larger than 1000
$\Msun$ today. For a population of black holes that better approximates mass
loss from winds and supernovae, we find that 16% of globulars can retain an
IMBH larger than 1000 $\Msun$. Our calculations show that if there are black
holes of mass $M > 60 \Msun$ in a cluster, repeated IMBH-BH encounters will
eventually eject a 1000 $\Msun$ IMBH with greater than 30% probability. As a
consequence, a large population of rogue black holes may exist in our Milky Way
halo. We discuss the dynamical implications of this subpopulation, and its
possible connection to ultraluminous X-ray sources (ULXs).
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 20:27:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Holley-Bockelmann",
"Kelly",
""
],
[
"Gultekin",
"Kayhan",
""
],
[
"Shoemaker",
"Deirdre",
""
],
[
"Yunes",
"Nico",
""
]
] |
0707.1335 | A. Raghuram | A. Raghuram and Freydoon Shahidi | Functoriality and special values of L-functions | 22 pages. To appear in the proceedings of the AIMS workshop (in
August 2005) on Eisenstein series and applications | null | null | null | math.NT math.RT | null | This is a semi-expository article concerning Langlands functoriality and
Deligne's conjecture on the special values of $L$-functions. The emphasis is on
symmetric power $L$-functions associated to a holomorphic cusp form, while
appealing to a recent work of Mahnkopf on the special values of automorphic
$L$-functions.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 20:18:49 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Raghuram",
"A.",
""
],
[
"Shahidi",
"Freydoon",
""
]
] |
0707.1336 | Jan van Ruitenbeek | I.K. Yanson, O.I. Shklyarevskii, J. M. van Ruitenbeek, S. Speller | Aluminium Nanowires: Influence of Work Hardening on Conductance
Histograms | 4 pages, 4 figures | Rev. B 77 033411 (2008) | 10.1103/PhysRevB.77.033411 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Conductance histograms of work-hardened Al show a series up to 11 equidistant
peaks with a period of 1.15 +/- 0.02 of the quantum conductance unit G_0 =
2e^2/h. Assuming the peaks originate from atomic discreteness, this agrees with
the value of 1.16 G_0 per atom obtained in numerical calculations by Hasmy et
al.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 20:42:54 GMT"
}
] | 2017-12-11T00:00:00 | [
[
"Yanson",
"I. K.",
""
],
[
"Shklyarevskii",
"O. I.",
""
],
[
"van Ruitenbeek",
"J. M.",
""
],
[
"Speller",
"S.",
""
]
] |
0707.1337 | Jim Bryan | Jim Bryan and Amin Gholampour | Root Systems and the Quantum Cohomology of ADE resolutions | null | null | null | null | math.AG hep-th math.QA | null | We compute the C*-equivariant quantum cohomology ring of Y, the minimal
resolution of the DuVal singularity C^2/G where G is a finite subgroup of
SU(2). The quantum product is expressed in terms of an ADE root system
canonically associated to G. We generalize the resulting Frobenius manifold to
non-simply laced root systems to obtain an n parameter family of algebra
structures on the affine root lattice of any root system. Using the Crepant
Resolution Conjecture, we obtain a prediction for the orbifold Gromov-Witten
potential of [C^2/G].
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 21:31:23 GMT"
}
] | 2007-07-12T00:00:00 | [
[
"Bryan",
"Jim",
""
],
[
"Gholampour",
"Amin",
""
]
] |
0707.1338 | Gergely Harcos | Tobias Berger, Gergely Harcos | l-Adic representations associated to modular forms over imaginary
quadratic fields | 11 pages, LaTeX2e; submitted | Int. Math. Res. Not. 2007, no. 23, Art. ID rnm113, 16 pp. | null | null | math.NT | null | Let pi be a regular algebraic cuspidal automorphic representation of GL(2)
over an imaginary quadratic number field K such that the central character of
pi is invariant under the non-trivial automorphism of K. We show that pi is
associated with an l-adic Galois representation rho over K such that at each
prime of K outside an explicit finite set the Frobenius polynomial of rho
agrees with the Hecke polynomial of pi.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 21:34:28 GMT"
}
] | 2010-04-23T00:00:00 | [
[
"Berger",
"Tobias",
""
],
[
"Harcos",
"Gergely",
""
]
] |
0707.1339 | Andrew Beretvas | A. Beretvas, J. Antos, Y.C. Chen, Z. Gunay, V. Sorin, K. Tollefson, P.
Bednar, S. Tokar, V. Boisvert, W. Hopkins, K. McFarland | Finding the Charge of the top quark in the Dilepton Channel | Presented at Symposium on Hadron Collider Physics 2006 (HCP 2006),
Durham, North Carolina, 22-26 May 2006 | null | null | FERMILAB-CONF-06-251-E, Aug 2006 | hep-ex | null | There is a question about the identity of the top quark. Is it the top quark
of the Standard Model (SM) with electric charge 2/3 or is it an exotic quark
with charge -4/3? An exotic quark has been proposed by D. Chang et
al.\cite{hep-ph/9810531, hep-ph/9805273}. This analysis will use the standard
CDF run II dilepton sample. The key ingredients of this analysis are the
correct pairing of the lepton and b-jet, the determination of the charge of the
b-jet. The analysis proceeds by using a binomial distribution and is formulated
so that rejecting one hypothesis means support for the other hypothesis.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 22:04:18 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Beretvas",
"A.",
""
],
[
"Antos",
"J.",
""
],
[
"Chen",
"Y. C.",
""
],
[
"Gunay",
"Z.",
""
],
[
"Sorin",
"V.",
""
],
[
"Tollefson",
"K.",
""
],
[
"Bednar",
"P.",
""
],
[
"Tokar",
"S.",
""
],
[
"Boisvert",
"V.",
""
],
[
"Hopkins",
"W.",
""
],
[
"McFarland",
"K.",
""
]
] |
0707.1340 | Pisin Chen | Pisin Chen and Kwang-Chang Lai | Plasma Suppression of Large Scale Structure Formation in the Universe | 4 pages and 2 figures | Phys.Rev.Lett.99:231302,2007 | 10.1103/PhysRevLett.99.231302 | null | astro-ph | null | We point out that during the reionization epoch of the cosmic history, the
plasma collective effect among the ordinary matter would suppress the large
scale structure formation. The imperfect Debye shielding at finite temperature
would induce a residual long-range electrostatic potential which, working
together with the baryon thermal pressure, would counter the gravitational
collapse. As a result the effective Jean's length, $\tilde{\lambda}_J$, is
increased by a factor, $\tilde{\lambda}_J/\lambda_J=\sqrt{8/5}$, relative to
the conventional one. For scales smaller than the effective Jean's scale the
plasma would oscillate at the ion-acoustic frequency. The modes that would be
influenced by this effect depend on the starting time and the initial
temperature of reionization, but roughly lie in the range $0.5 h{\rm Mpc}^{-1}<
k$, which corresponds to the region of the Lyman-$\alpha$ forest from the
inter-galactic medium. We predict that in the linear regime of density-contrast
growth, the plasma suppression of the matter power spectrum would approach
$1-(\Omega_{dm}/\Omega_m)^2\sim 1-(5/6)^2\sim 30%$.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 20:54:46 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Chen",
"Pisin",
""
],
[
"Lai",
"Kwang-Chang",
""
]
] |
0707.1341 | Liang Jiang | Liang Jiang, M. V. Gurudev Dutt, Emre Togan, Lily Childress, Paola
Cappellaro, Jacob M. Taylor, Mikhail D. Lukin | Coherence of an optically illuminated single nuclear spin qubit | 5 pages, 2 figures | Phys. Rev. Lett. 100, 073001 (2008) | 10.1103/PhysRevLett.100.073001 | null | quant-ph | null | We investigate the coherence properties of individual nuclear spin quantum
bits in diamond [Dutt et al., Science, 316, 1312 (2007)] when a proximal
electronic spin associated with a nitrogen-vacancy (NV) center is being
interrogated by optical radiation. The resulting nuclear spin dynamics are
governed by time-dependent hyperfine interaction associated with rapid
electronic transitions, which can be described by a spin-fluctuator model. We
show that due to a process analogous to motional averaging in nuclear magnetic
resonance, the nuclear spin coherence can be preserved after a large number of
optical excitation cycles. Our theoretical analysis is in good agreement with
experimental results. It indicates a novel approach that could potentially
isolate the nuclear spin system completely from the electronic environment.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 21:57:39 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 01:42:18 GMT"
}
] | 2008-02-20T00:00:00 | [
[
"Jiang",
"Liang",
""
],
[
"Dutt",
"M. V. Gurudev",
""
],
[
"Togan",
"Emre",
""
],
[
"Childress",
"Lily",
""
],
[
"Cappellaro",
"Paola",
""
],
[
"Taylor",
"Jacob M.",
""
],
[
"Lukin",
"Mikhail D.",
""
]
] |
0707.1342 | Michele Weber Dr. | Michael Weber (for the CDF Collaboration and the D0 Collaboration) | Top Quark Production and Decay Properties at the Tevatron | Proceedings of the 2006 Hadron Collider Physics (HCP06) conference; 8
pages, 6 figures | null | null | null | hep-ex | null | The latest results from the CDF and D0 collaborations on the top-quark
pair-production cross section and limits on electroweak production are
presented. Included are measurements of properties of the top quark such as
charge, lifetime, and the decay branching ratio t->Wb. In addition to
measurements about the top quark, the selected event samples are used to study
the helicity of the W boson and to search for additional exotic quarks (t') and
resonances in the ttbar invariant mass spectrum.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 22:35:32 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 13:18:29 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Weber",
"Michael",
"",
"for the CDF Collaboration and the D0 Collaboration"
]
] |
0707.1343 | Jos\'e A. Caballero | Jose Antonio Caballero, Enrique Solano | Albus 1: A very bright white dwarf candidate | ApJ Letters, in press | null | null | null | astro-ph | null | We have serendipitously discovered a previously-unknown, bright source (B_T =
11.75+/-0.07 mag) with a very blue V_T-K_s color, to which we have named Albus
1. A photometric and astrometric study using Virtual Observatory tools has
shown that it possesses an appreciable proper motion and magnitudes and colors
very similar to those of the well known white dwarf G 191-B2B. We consider
Albus 1 as a DA-type white dwarf located at about 40 pc. If confirmed its
nature, Albus 1 would be the sixth brightest isolated white dwarf in the sky,
which would make it an excellent spectrophotometric standard.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 22:38:37 GMT"
}
] | 2007-07-17T00:00:00 | [
[
"Caballero",
"Jose Antonio",
""
],
[
"Solano",
"Enrique",
""
]
] |
0707.1344 | Piotr M. Hajac | Piotr M. Hajac, Ulrich Kraehmer, Rainer Matthes, Bartosz Zielinski | Piecewise principal comodule algebras | null | null | null | null | math.QA math.RA | null | A comodule algebra P over a Hopf algebra H with bijective antipode is called
principal if the coaction of H is Galois and P is H-equivariantly projective
(faithfully flat) over the coaction-invariant subalgebra B. We prove that
principality is a piecewise property: given N comodule-algebra surjections
P->Pi whose kernels intersect to zero, P is principal if and only if all Pi's
are principal. Furthermore, assuming the principality of P, we show that the
lattice these kernels generate is distributive if and only if so is the lattice
obtained by intersection with B. Finally, assuming the above distributivity
property, we obtain a flabby sheaf of principal comodule algebras over a
certain space that is universal for all such N-families of surjections P->Pi
and such that the comodule algebra of global sections is P.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 22:56:22 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Dec 2007 15:32:57 GMT"
}
] | 2007-12-31T00:00:00 | [
[
"Hajac",
"Piotr M.",
""
],
[
"Kraehmer",
"Ulrich",
""
],
[
"Matthes",
"Rainer",
""
],
[
"Zielinski",
"Bartosz",
""
]
] |
0707.1345 | Francesco Calura | F. Calura (1), R. Jimenez (2,3), B. Panter (4), F. Matteucci (1,5), A.
F. Heavens (4) ((1) INAF-Osservatorio Astronomico di Trieste; (2) Dept. of
Physics & Astronomy, University of Pennsylvania; (3) Dept. of Astrophysical
Sciences, Princeton University; (4) Institute for Astronomy, University of
Edinburgh; (5) Dip. di Astronomia, Universita' di Trieste) | Loss of star forming gas in SDSS galaxies | 29 pages, 9 figures, ApJ, accepted | Astrophys.J.682:252-261,2008 | 10.1086/588376 | null | astro-ph | null | Using the star formation rates from the SDSS galaxy sample, extracted using
the MOPED algorithm, and the empirical Kennicutt law relating star formation
rate to gas density, we calculate the time evolution of the gas fraction as a
function of the present stellar mass. We show how the gas-to-stars ratio varies
with stellar mass, finding good agreement with previous results for smaller
samples at the present epoch. For the first time we show clear evidence for
progressive gas loss with cosmic epoch, especially in low-mass systems. We find
that galaxies with small stellar masses have lost almost all of their cold
baryons over time, whereas the most massive galaxies have lost little. Our
results also show that the most massive galaxies have evolved faster and turned
most of their gas into stars at an early time, thus strongly supporting a
downsizing scenario for galaxy evolution.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 23:05:48 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 20:26:18 GMT"
},
{
"version": "v3",
"created": "Thu, 13 Mar 2008 20:50:17 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Calura",
"F.",
""
],
[
"Jimenez",
"R.",
""
],
[
"Panter",
"B.",
""
],
[
"Matteucci",
"F.",
""
],
[
"Heavens",
"A. F.",
""
]
] |
0707.1346 | Mikkel Johnson | Trevor Stevens, Mikkel B. Johnson, Leonard S. Kisslinger, Ernest M.
Henley, W.-Y Pauchy Hwang, and Mathias Burkardt | Role of Charged Gauge Fields in Generating Magnetic Seed Fields in
Bubble Collisions during the Cosmological Electroweak Phase Transition | 15 Pages, 7 Figures | Phys.Rev.D77:023501,2008 | 10.1103/PhysRevD.77.023501 | null | astro-ph | null | We calculate the magnetic field generated during bubble collisions in a
first-order electroweak phase transition that may occur for some choices of
parameters in the minimal supersymmetric Standard Model. We show that for
sufficiently gentle collisions, where the Higgs field is relatively unperturbed
in the bubble overlap region, the equations of motion can be linearized so that
in the absence of fermions the charged W fields are the source of the
electromagnetic current for generating the seed fields. Solutions of the
equations of motion for the charged gauge fields and Maxwell's equations for
the magnetic field in O(1,2) space-time symmetry are expressed in closed form
by applying boundary conditions at the time of collision. Our results indicate
that the magnetic fields generated by charged $W^{\pm}$ fields in the collision
are comparable to those found in previous work. The magnetic fields so produced
could seed galactic and extra-galactic magnetic fields observed today.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 23:01:53 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Stevens",
"Trevor",
""
],
[
"Johnson",
"Mikkel B.",
""
],
[
"Kisslinger",
"Leonard S.",
""
],
[
"Henley",
"Ernest M.",
""
],
[
"Hwang",
"W. -Y Pauchy",
""
],
[
"Burkardt",
"Mathias",
""
]
] |
0707.1347 | Martin Cohen | Martin Cohen (1), Quentin A. Parker (2,3), Anne J. Green (4), Tara
Murphy (4,5), Brent Miszalski (2,6), David J. Frew (2,7), Marilyn R. Meade
(8), Brian Babler (8), Remy Indebetouw (9), Barbara A.Whitney (10), Christer
Watson (11), Edward B. Churchwell (8), Douglas F. Watson (8) ((1) Radio
Astronomy Lab., UC-Berkeley, CA, (2) Department of Physics, Macquarie
University, Sydney, Australia, (3) Anglo- Australian Observatory, Epping,
Australia, (4) School of Physics, University of Sydney, NSW, Australia, (5)
School of Information Technologies, University of Sydney, NSW, Australia, (6)
Observatoire Astronomique, Universite Louis Pasteur, Strasbourg, France, (7)
Perth Observatory, Bickley, WA, Australia, (8) Dept. of Astronomy, University
of Wisconsin, Madison, WI, (9) Astronomy Dept., University of Virginia,
Charlottesville, VA, (10) Space Science Institute, Boulder, CO, (11) Dept. of
Physics, Manchester College, North Manchester, IN) | Spitzer IRAC observations of newly-discovered planetary nebulae from the
Macquarie-AAO-Strasbourg H-alpha Planetary Nebula Project | 48 pages, LaTeX (aastex), incl. 18 PostScript (eps) figures and 3
tables. Accepted by Astrophysical Journal | Astrophys.J.669:343-362,2007 | 10.1086/521427 | null | astro-ph | null | We compare H-alpha, radio continuum, and Spitzer Space Telescope (SST) images
of 58 planetary nebulae (PNe) recently discovered by the Macquarie-AAO-Strasbo-
urg H-alpha PN Project (MASH) of the SuperCOSMOS H-alpha Survey. Using InfraRed
Array Camera (IRAC) data we define the IR colors of PNe and demonstrate good
isolation between these colors and those of many other types of astronomical
object. The only substantive contamination of PNe in the color-color plane we
illustrate is due to YSOs. However, this ambiguity is readily resolved by the
unique optical characteristics of PNe and their environs. We also examine the
relationships between optical and MIR morphologies from 3.6 to 8.0um and
explore the ratio of mid-infrared (MIR) to radio nebular fluxes, which is a
valuable discriminant between thermal and nonthermal emission. MASH emphasizes
late evolutionary stages of PNe compared with previous catalogs, enabling study
of the changes in MIR and radio flux that attend the aging process. Spatially
integrated MIR energy distributions were constructed for all MASH PNe observed
by the GLIMPSE Legacy Project, using the H-alpha morphologies to establish the
dimensions for the calculations of the Midcourse Space Experiment (MSX), IRAC,
and radio continuum (from the Molonglo Observatory Synthesis Telescope and the
Very Large Array) flux densities. The ratio of IRAC 8.0-um to MSX 8.3-um flux
densities provides a measure of the absolute diffuse calibration of IRAC at 8.0
um. We independently confirm the aperture correction factor to be applied to
IRAC at 8.0um to align it with the diffuse calibration of MSX. The result
agrees with the recommendations of the Spitzer Science Center and with results
from a parallel study of HII regions. These PNe probe the diffuse calibration
of IRAC on a spatial scale of 9-77 arcsec.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 23:16:39 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cohen",
"Martin",
""
],
[
"Parker",
"Quentin A.",
""
],
[
"Green",
"Anne J.",
""
],
[
"Murphy",
"Tara",
""
],
[
"Miszalski",
"Brent",
""
],
[
"Frew",
"David J.",
""
],
[
"Meade",
"Marilyn R.",
""
],
[
"Babler",
"Brian",
""
],
[
"Indebetouw",
"Remy",
""
],
[
"Whitney",
"Barbara A.",
""
],
[
"Watson",
"Christer",
""
],
[
"Churchwell",
"Edward B.",
""
],
[
"Watson",
"Douglas F.",
""
]
] |
0707.1348 | Kurt Jacobs | Kurt Jacobs | Engineering Quantum States of a Nano-Resonator via a Simple Auxiliary
System | 4 pages, revtex4, 1 eps figure | Phys. Rev. Lett. 99, 117203 (2007) (cover article, Sept. 14) | 10.1103/PhysRevLett.99.117203 | null | cond-mat.mes-hall quant-ph | null | We show how to engineer an extensive range of non-linear Hamiltonians for a
nano-mechanical resonator. The technique requires only a time dependent drive
applied to a Cooper-pair box or second oscillator to which the nano-resonator
is coupled. This method allows one to generate a large number of non-classical
states, as well as Hamiltonians whose classical counterparts are chaotic.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 23:43:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jacobs",
"Kurt",
""
]
] |
0707.1349 | Francesco Nitti | U. Gursoy, E. Kiritsis, F. Nitti | Exploring improved holographic theories for QCD: Part II | 65+18 pages, 20 figures (v3) Some modifications in Appendix E
explaining in more detail the issue of initial conditions; typos corrected.
Published version | JHEP 0802:019,2008 | 10.1088/1126-6708/2008/02/019 | null | hep-th hep-lat hep-ph | null | This paper is a continuation of ArXiv:0707.1324 where improved holographic
theories for QCD were set up and explored. Here, the IR confining geometries
are classified and analyzed. They all end in a "good" (repulsive) singularity
in the IR. The glueball spectra are gaped and discrete, and they favorably
compare to the lattice data. Quite generally, confinement and discrete spectra
imply each other. Asymptotically linear glueball masses can also be achieved.
Asymptotic mass ratios of various glueballs with different spin also turn out
to be universal. Mesons dynamics is implemented via space filling D4-anti-D4
brane pairs. The associated tachyon dynamics is analyzed and chiral symmetry
breaking is shown. The dynamics of the RR axion is analyzed, and the
non-perturbative running of the QCD theta-angle is obtained. It is shown to
always vanish in the IR.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 01:18:27 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Oct 2007 12:30:33 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Mar 2008 15:43:49 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Gursoy",
"U.",
""
],
[
"Kiritsis",
"E.",
""
],
[
"Nitti",
"F.",
""
]
] |
0707.1350 | Valerio Faraoni | Valerio Faraoni and Audrey Jacques (Bishop's University) | Cosmological expansion and local physics | 17 pages, LaTeX, to appear in Phys. Rev. D | Phys.Rev.D76:063510,2007 | 10.1103/PhysRevD.76.063510 | null | gr-qc astro-ph | null | The interplay between cosmological expansion and local attraction in a
gravitationally bound system is revisited in various regimes. First, weakly
gravitating Newtonian systems are considered, followed by various exact
solutions describing a relativistic central object embedded in a Friedmann
universe. It is shown that the ``all or nothing'' behaviour recently discovered
(i.e., weakly coupled systems are comoving while strongly coupled ones resist
the cosmic expansion) is limited to the de Sitter background. New exact
solutions are presented which describe black holes perfectly comoving with a
generic Friedmann universe. The possibility of violating cosmic censorship for
a black hole approaching the Big Rip is also discussed.
| [
{
"version": "v1",
"created": "Mon, 9 Jul 2007 23:57:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
],
[
"Jacques",
"Audrey",
"",
"Bishop's University"
]
] |
0707.1351 | Mustapha Ishak | James Richardson and Mustapha Ishak (The University of Texas at
Dallas) | Inverse approach to Einstein's equations for fluids with vanishing
anisotropic stress tensor | 15 pages, matches version to appear in Phys.Rev.D | Phys.Rev.D77:044005,2008 | 10.1103/PhysRevD.77.044005 | null | gr-qc astro-ph.CO | null | We expand previous work on an inverse approach to Einstein Field Equations
where we include fluids with energy flux and consider the vanishing of the
anisotropic stress tensor. We consider the approach using warped product
spacetimes of class $B_1$. Although restricted, these spacetimes include many
exact solutions of interest to compact object studies and to cosmological
models studies. The question explored here is as follows: given a spacetime
metric, what fluid flow (timelike congruence), if any, could generate the
spacetime via Einstein's equations. We calculate the flow from the condition of
a vanishing anisotropic stress tensor and give results in terms of the metric
functions in the three canonical types of coordinates. A condition for perfect
fluid sources is also provided. The framework developed is algorithmic and
suited for the study and validation of exact solutions using computer algebra
systems. The framework can be applied to solutions in comoving and non-comoving
frames of reference, and examples in different types of coordinates are worked
out.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 00:31:17 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Dec 2007 17:29:40 GMT"
}
] | 2011-02-01T00:00:00 | [
[
"Richardson",
"James",
"",
"The University of Texas at\n Dallas"
],
[
"Ishak",
"Mustapha",
"",
"The University of Texas at\n Dallas"
]
] |
0707.1352 | Eduardo Cattani | Eduardo Cattani | Mixed Lefschetz Theorems and Hodge-Riemann Bilinear Relations | 13 pages - Minor revisions. Final version to appear in International
Mathematics Research Notices | null | null | null | math.AG | null | Statements analogous to the Hard Lefschetz Theorem (HLT) and the
Hodge-Riemann bilinear relations (HRR) hold in a variety of contexts: they
impose restrictions on the cohomology algebra of a smooth compact K\"ahler
manifold or on the intersection cohomology of a projective toric variety; they
restrict the local monodromy of a polarized variation of Hodge structure; they
impose conditions on the possible $f$-vectors of convex polytopes. While the
statements of these theorems depend on the choice of a K\"ahler class, or its
analog, there is usually a cone of possible K\"ahler classes. It is then
natural to ask whether the HLT and HRR remain true in a mixed context. In this
note we present a unified approach to proving the mixed HLT and HRR,
generalizing the previously known results, and proving it in new cases such as
the intersection cohomology of non-rational polytopes.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 02:09:05 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 03:36:12 GMT"
}
] | 2008-02-19T00:00:00 | [
[
"Cattani",
"Eduardo",
""
]
] |
0707.1353 | John R. Klein | John R. Klein and William Richter | Poincare duality and Periodicity | A significant revision. In this version we produce infinite families
of examples of Poincare complexes whose top cell falls off after one
suspension, but which do not embed in codimension one. We also rewrote the
knot periodicity section in terms of Seifert surfaces rather than knot
complements | Algebr. Geom. Topol. 11 (2011) 1961-1985 | 10.2140/agt.2011.11.1961 | null | math.AT math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct periodic families of Poincare complexes, partially solving a
question of Hodgson that was posed in the proceedings of the 1982 Northwestern
homotopy theory conference. We also construct infinite families of Poincare
complexes whose top cell falls off after one suspension but which fail to embed
in a sphere of codimension one. We give a homotopy theoretic description of the
four-fold periodicity in knot cobordism.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 00:40:35 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jul 2007 14:06:41 GMT"
},
{
"version": "v3",
"created": "Wed, 3 Sep 2008 01:02:43 GMT"
},
{
"version": "v4",
"created": "Fri, 16 Oct 2009 21:31:25 GMT"
}
] | 2014-10-01T00:00:00 | [
[
"Klein",
"John R.",
""
],
[
"Richter",
"William",
""
]
] |
0707.1354 | Keigo Enya | Keigo Enya, Takao Nakagawa, Hidehiro Kaneda, Takashi Onaka, Tuyoshi
Ozaki, Masami Kume | Microscopic surface structure of C/SiC composite mirrors for space
cryogenic telescopes | 25 pages, 6 figures | Appl.Opt.46:2049-2056,2007 | 10.1364/AO.46.002049 | null | astro-ph | null | We report on the microscopic surface structure of carbon-fiber-reinforced
silicon carbide (C/SiC) composite mirrors that have been improved for the Space
Infrared Telescope for Cosmology and Astrophysics (SPICA) and other cooled
telescopes. The C/SiC composite consists of carbon fiber, silicon carbide, and
residual silicon. Specific microscopic structures are found on the surface of
the bare C/SiC mirrors after polishing. These structures are considered to be
caused by the different hardness of those materials. The roughness obtained for
the bare mirrors is 20 nm rms for flat surfaces and 100 nm rms for curved
surfaces. It was confirmed that a SiSiC slurry coating is effective in reducing
the roughness to 2 nm rms. The scattering properties of the mirrors were
measured at room temperature and also at 95 K. No significant change was found
in the scattering properties through cooling, which suggests that the
microscopic surface structure is stable with changes in temperature down to
cryogenic values. The C/SiC mirror with the SiSiC slurry coating is a promising
candidate for the SPICA telescope.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 00:58:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Enya",
"Keigo",
""
],
[
"Nakagawa",
"Takao",
""
],
[
"Kaneda",
"Hidehiro",
""
],
[
"Onaka",
"Takashi",
""
],
[
"Ozaki",
"Tuyoshi",
""
],
[
"Kume",
"Masami",
""
]
] |
0707.1355 | Kenley Jung | Kenley Jung | Graphs of functions and vanishing free entropy | 14 pages | null | null | null | math.OA | null | Suppose X is an n-tuple of selfadjoint elements in a tracial von Neumann
algebra M. If z is a selfadjoint element in M and for some selfadjoint element
y in the von Neumann algebra generated by X $\delta_0(y, z) < \delta_0(y) +
\delta_0(z)$, then $\chi(X \cup \{z\}) = -\infty$ (here $\chi$ and $\delta_0$
denote the microstates free entropy and free entropy dimension, respectively).
In particular, if z lies in the von Neumann algebra generated by X, then
$\chi(X \cup \{z\}) = -\infty$. The statement and its proof are motivated by
geometric-measure-theoretic results on graphs of functions. A similar statement
for the nonmicrostates free entropy is obtained under the much stronger
hypothesis that z lies in the algebra generated by X.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 01:37:02 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Jung",
"Kenley",
""
]
] |
0707.1356 | Sema Salur | Sema Salur and Osvaldo Santillan | Mirror symmetry aspects for compact G_2 manifolds | 19 pages, Latex, some explanation clarified | null | null | null | hep-th math.AG math.GT | null | The present paper deals with mirror symmetry aspects of compact ``barely''
$G_2$ manifolds, that is, $G_2$ manifolds of the form (CY$\times
S^1)/\mathbb{Z}_2$. We propose that the mirror of any barely $G_2$ manifold is
another barely one and which is constructed as a fibration of the \emph{mirror}
of the CY base. Also, we describe the Joyce manifolds of the first kind as
``barely'' and we show that the underlying CY of all the family is self-mirror
with $h^{1,1}=h^{2,1}=19$. We thus propose that the mirror of a Joyce space of
the first kind will be another Joyce space of the first kind.We also suggest
that this self-mirror CY family is dual to K3$\times S^1$ in the
heterotic/M-theory sense, and that arise as a particular case of the
Borcea-Voisin construction. As a spin-off we conclude from this analysis that
no 5-brane instantons are present in compactifications of eleven dimensional
supergravity over Joyce manifolds of the first kind.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 19:53:23 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 19:11:27 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Dec 2007 16:39:45 GMT"
}
] | 2007-12-24T00:00:00 | [
[
"Salur",
"Sema",
""
],
[
"Santillan",
"Osvaldo",
""
]
] |
0707.1357 | Daniel Kosov | D. S. Kosov, M. F. Gelin and A.I. Vdovin | Calculations of canonical averages from the grand canonical ensemble | null | Phys. Rev. E 77, 021120 (2008) | 10.1103/PhysRevE.77.021120 | null | cond-mat.stat-mech | null | Grand canonical and canonical ensembles become equivalent in the
thermodynamic limit, but when the system size is finite the results obtained in
the two ensembles deviate from each other. In many important cases, the
canonical ensemble provides an appropriate physical description but it is often
much easier to perform the calculations in the corresponding grand canonical
ensemble. We present a method to compute averages in canonical ensemble based
on calculations of the expectation values in grand canonical ensemble. The
number of particles, which is fixed in the canonical ensemble, is not
necessarily the same as the average number of particles in the grand canonical
ensemble.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 02:07:34 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Feb 2008 23:34:38 GMT"
}
] | 2008-02-26T00:00:00 | [
[
"Kosov",
"D. S.",
""
],
[
"Gelin",
"M. F.",
""
],
[
"Vdovin",
"A. I.",
""
]
] |
0707.1358 | Li-Da Zhang | Yi-Shi Duan, Li-Da Zhang, Yu-Xiao Liu | Self-dual Vortices in the Abelian Chern-Simons Model with Two Complex
Scalar Fields | 9 pages, no figures | Mod.Phys.Lett.A23:2189-2198,2008 | 10.1142/S0217732308026273 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Making use of $\phi$-mapping topological current method, we discuss the
self-dual vortices in the Abelian Chern-Simons model with two complex scalar
fields. For each scalar field, an exact nontrivial equation with a topological
term which is missing in many references is derived analytically. The general
angular momentum is obtained. The magnetic flux which relates the two scalar
fields is calculated. Furthermore, we investigate the vortex evolution
processes, and find that because of the present of the vortex molecule, these
evolution processes is more complicated than the vortex evolution processes in
the corresponding single scalar field model.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 02:37:13 GMT"
},
{
"version": "v2",
"created": "Sun, 31 Aug 2008 13:07:26 GMT"
}
] | 2008-11-07T00:00:00 | [
[
"Duan",
"Yi-Shi",
""
],
[
"Zhang",
"Li-Da",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] |
0707.1359 | Norio Kumada | N. Kumada, K. Muraki and Y. Hirayama | NMR Evidence for Spin Canting in a Bilayer nu = 2 Quantum Hall System | Accepted for Phys. Rev. Lett | Phys. Rev. Lett. 99, 076805 (2007). | 10.1103/PhysRevLett.99.076805 | null | cond-mat.mes-hall cond-mat.str-el | null | We investigate the electron spin states in the bilayer quantum Hall system at
total Landau level filling factor nu =2 exploiting current-pumped and
resistively detected NMR. The measured Knight shift, KS, of 75As nuclei reveals
continuous variation of the out-of-plane electronic spin polarization between
nearly full and zero as a function of density imbalance. Nuclear spin
relaxation measurements indicate a concurrent development of an in-plane spin
component. These results provide direct information on the spin configuration
in this system and comprise strong evidence for the spin canting suggested by
previous experiments.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 03:20:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kumada",
"N.",
""
],
[
"Muraki",
"K.",
""
],
[
"Hirayama",
"Y.",
""
]
] |
0707.1360 | Thomas M. Dame | T. M. Dame | On the Distance and Molecular Environment of Westerlund 2 and HESS
J1023-575 | ApJ Letter, accepted July 5, 2007. 10 pages, 4 figures (2 color) | null | 10.1086/521363 | null | astro-ph | null | The extended TeV gamma-ray source HESS J1023-575 is coincident with the
massive, young stellar cluster Westerlund 2 (Wd2) and its surrounding HII
region RCW 49. On the basis of an analysis of the CO emission and 21 cm
absorption along the line of sight to Wd2, it is argued that this cluster, and
by assumption the TeV source as well, must be associated with a giant molecular
cloud in the far side of the Carina arm with a mass of 7.5 x 10^5 Mo. Analysis
of the spatial and velocity structure of the cloud reveals clear evidence of
interaction with Wd2. The cloud's kinematic distance of 6.0 +/- 1.0 kpc is
shown to be consistent with distances inferred both from the radius-linewidth
relation of molecular clouds and from the foreground gas column derived from
230 X-ray sources in Wd2.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 19:34:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dame",
"T. M.",
""
]
] |
0707.1361 | Shigeru Kuroda | Shigeru Kuroda | A generalization of the Shestakov-Umirbaev inequality | null | null | null | null | math.AC | null | We give a generalization of the Shestakov-Umirbaev inequality which plays an
important role in their solution of the tame generators conjecture.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 05:59:35 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Kuroda",
"Shigeru",
""
]
] |
0707.1362 | Matthias K\"oppe | Jes\'us A. De Loera, Raymond Hemmecke, Matthias K\"oppe | Pareto Optima of Multicriteria Integer Linear Programs | 17 pages, 1 figure | INFORMS Journal on Computing 21 (2009), no. 1, 39-48 | 10.1287/ijoc.1080.0277 | null | math.OC | null | We settle the computational complexity of fundamental questions related to
multicriteria integer linear programs, when the dimensions of the strategy
space and of the outcome space are considered fixed constants. In particular we
construct:
1. polynomial-time algorithms to exactly determine the number of Pareto
optima and Pareto strategies;
2. a polynomial-space polynomial-delay prescribed-order enumeration algorithm
for arbitrary projections of the Pareto set;
3. an algorithm to minimize the distance of a Pareto optimum from a
prescribed comparison point with respect to arbitrary polyhedral norms;
4. a fully polynomial-time approximation scheme for the problem of minimizing
the distance of a Pareto optimum from a prescribed comparison point with
respect to the Euclidean norm.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 03:52:59 GMT"
}
] | 2017-01-03T00:00:00 | [
[
"De Loera",
"Jesús A.",
""
],
[
"Hemmecke",
"Raymond",
""
],
[
"Köppe",
"Matthias",
""
]
] |
0707.1363 | Gerd Bergmann | Gerd Bergmann and Liye Zhang | A Compact Approximate Solution to the Kondo Problem | null | null | 10.1103/PhysRevB.76.064401 | null | cond-mat.mes-hall cond-mat.str-el | null | A compact approximate groundstate of the Kondo problem is introduced. It
consists of four Slater states. The spin up and down states of the localized
d-impurity are paired with two localized s-electron states of opposite spin.
All the remaining s-electron states are rearranged forming two new optimal
orthonormal bases. Through a rotation in Hilbert space the two localized states
(and the rest of the bases) are optimized by minimizing the energy expectation
value. The ground-state energy E and the singlet-triplet excitation energy dE
are calculated numerically. Although the two energies can differ by a factor of
1000, they are obtained simultaneously. The singlet-triplet excitation energy
dE is proportional to exp[-1/2Jg] and quite close to the Kondo temperature
k_BT_K. The cases for anti-ferromagnetic (J>0) and ferromagnetic (J<0) coupling
are investigated.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 04:20:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bergmann",
"Gerd",
""
],
[
"Zhang",
"Liye",
""
]
] |
0707.1364 | Robert Gilman | Robert Gilman, Alexei G. Miasnikov, Alexey D. Myasnikov, Alexander
Ushakov | Report on Generic Case Complexity | 17 pages | null | null | null | cs.CC | null | This article is a short introduction to generic case complexity, which is a
recently developed way of measuring the difficulty of a computational problem
while ignoring atypical behavior on a small set of inputs. Generic case
complexity applies to both recursively solvable and recursively unsolvable
problems.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 18:57:08 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Gilman",
"Robert",
""
],
[
"Miasnikov",
"Alexei G.",
""
],
[
"Myasnikov",
"Alexey D.",
""
],
[
"Ushakov",
"Alexander",
""
]
] |
0707.1365 | Jung Pil Park | Young Hyun Cho, Jung Pil Park | Conditions for Generic Initial Ideals to be Almost Reverse Lexicographic | 10 pages | null | null | null | math.AC | null | Let $I$ be a homogeneous Artinian ideal in a polynomial ring
$R=k[x_1,...,x_n]$ over a field $k$ of characteristic 0. We study an equivalent
condition for the generic initial ideal $\gin(I)$ with respect to reverse
lexicographic order to be almost reverse lexicographic. As a result, we show
that Moreno-Socias conjecture implies Fr\"{o}berg conjecture. And for the case
$\Codim I \le 3$, we show that $R/I$ has the strong Lefschetz property if and
only if $\gin(I)$ is almost reverse lexicographic. Finally for a monomial
complete intersection Artinian ideal $I=(x_1^{d_1},...,x_n^{d_n})$, we prove
that $\gin(I)$ is almost reverse lexicographic if $d_i > \sum_{j=1}^{i-1} d_j -
i + 1$ for each $i \ge 4$. Using this, we give a positive partial answer to
Moreno-Socias conjecture, and to Fr\"{o}berg conjecture.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 04:57:50 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 07:11:19 GMT"
}
] | 2007-07-16T00:00:00 | [
[
"Cho",
"Young Hyun",
""
],
[
"Park",
"Jung Pil",
""
]
] |
0707.1366 | Kenzo Sasai | Kenzo Sasai, Kazuma Hirota, Yohei Nagao, Shigeki Yonezawa, and Zenji
Hiroi | Neutron Scattering Study of the Localized Mode in the beta-Pyrochlore
Superconductors AOs2O6 | 12 pages, 6 figures; typos and graph corrected | J. Phys. Soc. Jpn. 76, 104603 (2007) | 10.1143/JPSJ.76.104603 | null | cond-mat.mtrl-sci cond-mat.supr-con | null | Inelastic neutron scattering and neutron powder diffraction experiments were
carried out to investigate a localized mode, proposed from various bulk
measurements, in the beta-pyrochlore AOs2O6 (A=K, Rb, Cs). The localized mode
was identified in all the three compounds as well as another beta-pyrochlore
CsW2O6. The anharmonicity of the mode is weak in RbOs2O6 and CsOs2O6 but
substantial in KOs2O6.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 05:45:21 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 03:59:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sasai",
"Kenzo",
""
],
[
"Hirota",
"Kazuma",
""
],
[
"Nagao",
"Yohei",
""
],
[
"Yonezawa",
"Shigeki",
""
],
[
"Hiroi",
"Zenji",
""
]
] |
0707.1367 | T. P. Pareek | T. P. Pareek and A. M. Jayannavar | Generation and Measurement of Non Equilibrium Spin Currents in Two
Terminal Systems | 4 pages, 5 figures | null | 10.1103/PhysRevB.77.153307 | null | cond-mat.mes-hall | null | Generation and measurement of non-equilibrium spin current in two probe
configuration is discussed. It is argued and shown that spin current can be
generated in two terminal non-magnetic system. Further it is shown that these
spin currents can be measured via conductance in two probe configuration when
the detector probe is ferromagnetic.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 06:31:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pareek",
"T. P.",
""
],
[
"Jayannavar",
"A. M.",
""
]
] |
0707.1368 | Manwah Wong | Manwah Lilian Wong | Generalized Bounded Variation and Inserting point masses | To appear in Constructive Approximation | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $d\mu$ be a probability measure on the unit circle and $d\nu$ be the
measure formed by adding a pure point to $d\mu$. We give a simple formula for
the Verblunsky coefficients of $d\nu$ based on a result of Simon.
Then we consider $d\mu_0$, a probability measure on the unit circle with
$\ell^2$ Verblunsky coefficients $(\alpha_n (d\mu_0))_{n=0}^{\infty}$ of
bounded variation. We insert $m$ pure points to $d\mu$, rescale, and form the
probability measure $d\mu_m$. We use the formula above to prove that the
Verblunsky coefficients of $d\mu_m$ are in the form $\alpha_n(d\mu_0) +
\sum_{j=1}^m \frac{\ol{z_j}^{n} c_j}{n} + E_n$, where the $c_j$'s are constants
of norm 1 independent of the weights of the pure points and independent of $n$;
the error term $E_n$ is in the order of $o(1/n)$. Furthermore, we prove that
$d\mu_m$ is of $(m+1)$-generalized bounded variation - a notion that we shall
introduce in the paper. Then we use this fact to prove that $\lim_{n \to
\infty} \vp_n^*(z, d\mu_m)$ is continuous and is equal to $D(z, d\mu_m)^{-1}$
away from the pure points.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 06:20:44 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Sep 2008 20:03:34 GMT"
}
] | 2008-09-28T00:00:00 | [
[
"Wong",
"Manwah Lilian",
""
]
] |
0707.1369 | Shravan Hanasoge | S. M. Hanasoge, S. Couvidat, S. P. Rajaguru, A. C. Birch | Impact of Locally Suppressed Wave sources on helioseismic travel times | Revised version. Submitted to ApJ | null | 10.1111/j.1365-2966.2008.14013.x | null | astro-ph | null | Wave travel-time shifts in the vicinity of sunspots are typically interpreted
as arising predominantly from magnetic fields, flows, and local changes in
sound speed. We show here that the suppression of granulation related wave
sources in a sunspot can also contribute significantly to these travel-time
shifts, and in some cases, an asymmetry between in and outgoing wave travel
times. The tight connection between the physical interpretation of travel times
and source-distribution homogeneity is confirmed. Statistically significant
travel-time shifts are recovered upon numerically simulating wave propagation
in the presence of a localized decrease in source strength. We also demonstrate
that these time shifts are relatively sensitive to the modal damping rates;
thus we are only able to place bounds on the magnitude of this effect. We see a
systematic reduction of 10-15 seconds in $p$-mode mean travel times at short
distances ($\sim 6.2$ Mm) that could be misinterpreted as arising from a
shallow (thickness of 1.5 Mm) increase ($\sim$ 4%) in the sound speed. At
larger travel distances ($\sim 24$ Mm) a 6-13 s difference between the ingoing
and outgoing wave travel times is observed; this could mistakenly be
interpreted as being caused by flows.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 06:20:54 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 03:57:10 GMT"
},
{
"version": "v3",
"created": "Wed, 31 Oct 2007 05:49:48 GMT"
},
{
"version": "v4",
"created": "Thu, 13 Mar 2008 21:24:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hanasoge",
"S. M.",
""
],
[
"Couvidat",
"S.",
""
],
[
"Rajaguru",
"S. P.",
""
],
[
"Birch",
"A. C.",
""
]
] |
0707.1370 | Kyungsik Kim | K. S. Kim, B. G. Yu, M. K. Cheoun, T. K. Choi, and M. T. Chung | Neutral-current Neutrino-nucleus Scattering in Quasielastic Region | 15 pages, 6 figures | J.Phys.G34:2643-2654,2007 | 10.1088/0954-3899/34/12/009 | null | nucl-th | null | The neutral-current neutrino-nucleus scattering is calculated through the
neutrino-induced knocked-out nucleon process in the quasielastic region by
using a relativistic single particle model for the bound and continuum states.
The incident energy range between 500 MeV and 1.0 GeV is used for the neutrino
(antineutrino) scattering on ^{12}C target nucleus. The effects of the final
state interaction of the knocked-out nucleon are studied not only on the cross
section but also on the asymmetry due to the difference between neutrinos and
antineutrinos, within a relativistic optical potential. We also investigate the
sensitivity of the strange quark contents in the nucleon on the asymmetry.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 06:25:00 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Jul 2007 00:35:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"K. S.",
""
],
[
"Yu",
"B. G.",
""
],
[
"Cheoun",
"M. K.",
""
],
[
"Choi",
"T. K.",
""
],
[
"Chung",
"M. T.",
""
]
] |
0707.1371 | Astrid Morreale | Astrid Morreale | Accesing the Gluon Polarization through the Double Longitudinal Spin
Asymmetrie in Charged Pion Production at PHENIX | 4 pages, 4 figures, Spin2006 conference, proceedings | AIPConf.Proc.915:359-362,2007 | 10.1063/1.2750796 | null | hep-ex | null | With proton-proton collisions at PHENIX a variety of direct channels are used
to probe the proton substructure. Of the many channels available at PHENIX,
charged pion measurements are expected to have sensitivity of Delta g and thus
help in the global analysis that will constrain it. We present a measurement of
mid-rapidity charged pion production double longitudinal spin asymmetries (ALL)
at the pT range of 5-10 GeV/c at collision energies of sqrt(s) = 200 GeV.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 06:33:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Morreale",
"Astrid",
""
]
] |
0707.1372 | Frederic Blanqui | Fr\'ed\'eric Blanqui (INRIA Lorraine - LORIA) | Computability Closure: Ten Years Later | null | Dans Colloquium in honor of Jean-Pierre Jouannaud, 4600 (2007) | null | null | cs.LO | null | The notion of computability closure has been introduced for proving the
termination of higher-order rewriting with first-order matching by Jean-Pierre
Jouannaud and Mitsuhiro Okada in a 1997 draft which later served as a basis for
the author's PhD. In this paper, we show how this notion can also be used for
dealing with beta-normalized rewriting with matching modulo beta-eta (on
patterns \`a la Miller), rewriting with matching modulo some equational theory,
and higher-order data types (types with constructors having functional
recursive arguments). Finally, we show how the computability closure can easily
be turned into a reduction ordering which, in the higher-order case, contains
Jean-Pierre Jouannaud and Albert Rubio's higher-order recursive path ordering
and, in the first-order case, is equal to the usual first-order recursive path
ordering.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 06:33:52 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Blanqui",
"Frédéric",
"",
"INRIA Lorraine - LORIA"
]
] |
0707.1373 | Dimiter Stamenov | Elliot Leader, Aleksander V. Sidorov, Dimiter B. Stamenov | Polarized Parton Densities and Higher Twist in the Light of the Recent
CLAS and COMPASS data | 4 pages, 3 figures, typo in Ref. 8 corrected, to appear in the
Proceedings of the 15th International Workshop on Deep-Inelastic Scattering
and Related Subjects (DIS2007), Munich, Germany, 16-20 April 2007 | null | null | null | hep-ph hep-ex | null | The impact of the recent very precise CLAS and COMPASS g_1/F_1 data on
polarized parton densities and higher twist effects is discussed. We
demonstrate that the low Q^2 CLAS data improve essentially our knowledge of
higher twist corrections to the spin structure function g1, while the large Q^2
COMPASS data influence mainly the strange quark and gluon polarizations which
slightly decrease. We find also that the present inclusive DIS data cannot rule
out a negative polarized and changing in sign gluon densities.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 07:07:40 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 14:01:25 GMT"
}
] | 2007-07-12T00:00:00 | [
[
"Leader",
"Elliot",
""
],
[
"Sidorov",
"Aleksander V.",
""
],
[
"Stamenov",
"Dimiter B.",
""
]
] |
0707.1374 | Engel Roza | Engel Roza | The quantummechanical wave equations from a relativistic viewpoint | 20 pages, no figures | null | null | null | physics.gen-ph | null | A derivation is presented of the quantummechanical wave equations based upon
the Equity Principle of Einstein's General Relativity Theory. This is believed
to be more generic than the common derivations based upon Einstein's energy
relationship for moving particles. It is shown that Schrodinger's Equation, if
properly formulated, is relativisticly covariant. This makes the critisized
Klein-Gordon Equation for spinless massparticles obsolete. Therefore Dirac's
Equation is presented from a different viewpoint and it is shown that the
relativistic covariance of Schrodinger's Equation gives a natural explanation
for the dual energy outcome of Dirac's derivation and for the nature of
antiparticles. The propagation of wave functions in an energy field is studied
in terms of propagation along geodesic lines in curved space-time, resulting in
an equivalent formulation as with Feynman's path integral. It is shown that
Maxwell's wave equation fits in the developed framework as the massless limit
of moving particles. Finally the physical appearance of electrons is discussed
including a quantitative calculation of the jitter phenomenon of a free moving
electron.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 19:42:40 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jul 2007 17:52:09 GMT"
}
] | 2007-07-19T00:00:00 | [
[
"Roza",
"Engel",
""
]
] |
0707.1375 | Roberto Paoletti | Roberto Paoletti | Szego kernels, Toeplitz operators, and equivariant fixed point formulae | statement and proof simplified, exposition improved, references added | null | null | null | math.AG math.CV math.SG | null | Let $\gamma$ be an automorphism of a polarized complex projective manifold
$(M,L)$. Then $\gamma$ induces an automorphism $\gamma_k$ of the space of
global holomorphic sections of the $k$-th tensor power of $L$, for every
$k=1,2,...$; for $k\gg 0$, the Lefschetz fixed point formula expresses the
trace of $\gamma_k$ in terms of fixed point data. More generally, one may
consider the composition of $\gamma_k$ with the Toeplitz operator associated to
some smooth function on $M$. Still more generally, in the presence of the
compatible action of a compact and connected Lie group preserving
$(M,L,\gamma)$, one may consider induced linear maps on the equivariant
summands associated to the irreducible representations of $G$. In this paper,
under familiar assumptions in the theory of symplectic reductions, we show that
the traces of these maps admit an asymptotic expansion as $k\to +\infty$, and
compute its leading term.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 14:22:36 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 14:22:02 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Jul 2007 07:16:57 GMT"
},
{
"version": "v4",
"created": "Fri, 14 Mar 2008 10:59:18 GMT"
}
] | 2008-03-14T00:00:00 | [
[
"Paoletti",
"Roberto",
""
]
] |
0707.1376 | Sushil Srivastava | S. K. Srivastava | Can Phantom-Dominated Universe Decelerate Also in Future ? | 17 pages | null | null | null | gr-qc | null | Here Randall-Sundrum brane-gravity models of the homogeneous and flat
universe, dominated by phantom fluid, is considered. It is noted that
brane-gravity corrections effect the behaviour of phantom fluid in RS-II model
(where brane-tension $\lambda$ is negative) drastically. It is interesting to
see that, phantom fluid violates the weak energy condition (WEC) till energy
density $\rho < \lambda$, but when phantom energy density $\rho$ grows more,
the effective equation of state does not violate WEC. Moreover, with increasing
phantom energy density, a stage comes when even strong energy condition is not
violated due to effect of these corrections. Also expansion stops, when $\rho =
2 \lambda$. As a consequence, RS-II phantom universe accelerates upto a finite
time explaining the present cosmic acceleration, but it decelerates later.Thus,
RS-II phantom universe is singularity-free. In the case of RS-I model, where
$\lambda$ is positive, characteristics of phantom fluid is not suppressed by
brane-corrections and phantom universe accelerates ending up in big-rip
singularity in finite future time.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:09:11 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 08:07:23 GMT"
},
{
"version": "v3",
"created": "Fri, 30 Nov 2007 08:10:45 GMT"
},
{
"version": "v4",
"created": "Sun, 2 Dec 2007 02:55:37 GMT"
},
{
"version": "v5",
"created": "Tue, 4 Dec 2007 23:20:07 GMT"
},
{
"version": "v6",
"created": "Wed, 2 Jan 2008 09:21:56 GMT"
}
] | 2008-01-02T00:00:00 | [
[
"Srivastava",
"S. K.",
""
]
] |
0707.1377 | Geoff Stedman Prof | G. E. Stedman, R. B. Hurst and K. U. Schreiber | On the Potential of Large Ring Lasers | accepted optics communications | null | 10.1016/j.optcom.2007.07.011 | null | physics.optics physics.gen-ph | null | We describe a new ring laser with area A = 833 m^2 and update performance
statistics for several such machines. Anandan & Chaio 1982 judged ring lasers
inferior to matter interferometers as possible detectors of gravitational
waves. However, we note that geophysically interesting results have been
obtained from large ring lasers and that there is still a lot of room for
improvements.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:24:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stedman",
"G. E.",
""
],
[
"Hurst",
"R. B.",
""
],
[
"Schreiber",
"K. U.",
""
]
] |
0707.1378 | Matteo Cacciari | Matteo Cacciari and Gavin P. Salam | Pileup subtraction using jet areas | 12 pages, 7 figures. Revised version with many changes and additions,
small and larger. No changes in conclusions. Version published in Physics
Letters B | Phys.Lett.B659:119-126,2008 | 10.1016/j.physletb.2007.09.077 | LPTHE-07-01 | hep-ph hep-ex | null | One of the major challenges for the LHC will be to extract precise
information from hadronic final states in the presence of the large number of
additional soft pp collisions, pileup, that occur simultaneously with any hard
interaction in high luminosity runs. We propose a novel technique, based on jet
areas, that provides jet-by-jet corrections for pileup and underlying-event
effects. It is data driven, does not depend on Monte Carlo modelling and can be
used with any jet algorithm for which a jet area can be sensibly defined. We
illustrate its effectiveness for some key processes and find that it can be
applied also in the context of the Tevatron, low-luminosity LHC and LHC
heavy-ion collisions.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 13:53:09 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jan 2008 08:27:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cacciari",
"Matteo",
""
],
[
"Salam",
"Gavin P.",
""
]
] |
0707.1379 | Stefania Scarsoglio | Daniela Tordella and Stefania Scarsoglio | Streamwise evolution of the entrainment in a steady two-dimensional
bluff-body wake | This paper has been withdrawn by the authors, as it has been rejected
in October 2007. | null | null | null | physics.flu-dyn | null | This paper has been withdrawn by the authors, as it has been rejected in
October 2007.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:28:10 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jun 2008 16:55:45 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Mar 2010 16:15:06 GMT"
}
] | 2010-03-16T00:00:00 | [
[
"Tordella",
"Daniela",
""
],
[
"Scarsoglio",
"Stefania",
""
]
] |
0707.1380 | Stefan Uttenthaler | Stefan Uttenthaler (1), Thomas Lebzelter (1), Sara Palmerini (2),
Maurizio Busso (2), Bernhard Aringer (1), and Michael T. Lederer (1) ((1)
Institute for Astronomy, University of Vienna, Austria (2) Department of
Physics, University of Perugia, Italy) | Low-mass lithium-rich AGB stars in the Galactic bulge: evidence for Cool
Bottom Processing? | 5 pages, 3 figures, accepted by A&A Letters | Astron.Astrophys.471:L41-L45,2007 | 10.1051/0004-6361:20077879 | null | astro-ph | null | Context: The stellar production of the light element lithium is still a
matter of debate.
Aims: We report the detection of low-mass, Li-rich Asymptotic Giant Branch
(AGB) stars located in the Galactic bulge.
Methods: A homogeneous and well-selected sample of low mass, oxygen-rich AGB
stars in the Galactic bulge has been searched for the absorption lines of Li.
Using spectral synthesis techniques, we determine from high resolution UVES/VLT
spectra the Li abundance in four out of 27 sample stars, and an upper limit for
the remaining stars.
Results: Two stars in our sample have a solar Li abundance or above; these
stars seem to be a novelty, since they do not show any s-element enhancement.
Two more stars have a Li abundance slightly below solar; these stars do show
s-element enhancement in their spectra. Different scenarios which lead to an
increased Li surface abundance in AGB stars are discussed.
Conclusions: Of the different enrichment scenarios presented, Cool Bottom
Processing (CBP) is the most likely one for the Li-rich objects identified
here. Self-enrichment by Hot Bottom Burning (HBB) seems very unlikely as all
Li-rich stars are below the HBB mass limit. Also, the ingestion of a low mass
companion into the stars' envelope is unlikely because the associated
additional effects are lacking. Mass transfer from a former massive binary
companion is a possible scenario, if the companion produced little s-process
elements. A simple theoretical estimation for the Li abundance due to CBP is
presented and compared to the observed values.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:43:21 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Uttenthaler",
"Stefan",
""
],
[
"Lebzelter",
"Thomas",
""
],
[
"Palmerini",
"Sara",
""
],
[
"Busso",
"Maurizio",
""
],
[
"Aringer",
"Bernhard",
""
],
[
"Lederer",
"Michael T.",
""
]
] |
0707.1381 | Hiroaki Terao | Hidehiko Kamiya, Akimichi Takemura and Hiroaki Terao | The characteristic quasi-polynomials of the arrangements of root systems
and mid-hyperplane arrangements | null | Progress in Math. 283, Arrangements, local systems and
singularities, (ed. F. Elzein, A. Suciu, M. Tosun, A. M. Uludag, S.
Yuzvinsky) 2010,Birkhauser, 177-190 | null | null | math.CO math.RT | null | Let $q$ be a positive integer. In our recent paper, we proved that the
cardinality of the complement of an integral arrangement, after the modulo $q$
reduction, is a quasi-polynomial of $q$, which we call the characteristic
quasi-polynomial. In this paper, we study general properties of the
characteristic quasi-polynomial as well as discuss two important examples: the
arrangements of reflecting hyperplanes arising from irreducible root systems
and the mid-hyperplane arrangements. In the root system case, we present a
beautiful formula for the generating function of the characteristic
quasi-polynomial which has been essentially obtained by Ch. Athanasiadis and by
A. Blass and B. Sagan. On the other hand, it is hard to find the generating
function of the characteristic quasi-polynomial in the mid-hyperplane
arrangement case. We determine them when the dimension is less than six.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:33:45 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 08:51:35 GMT"
},
{
"version": "v3",
"created": "Thu, 4 Oct 2007 02:27:56 GMT"
}
] | 2011-06-22T00:00:00 | [
[
"Kamiya",
"Hidehiko",
""
],
[
"Takemura",
"Akimichi",
""
],
[
"Terao",
"Hiroaki",
""
]
] |
0707.1382 | Chang Yong Liu | Chang-Yong Liu | Thermal Phase in Bubbling Geometries | This paper has been withdrawn | null | 10.1088/0253-6102/50/1/29 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper has been withdrawn by the author due to a crucial sign error in
equation 1.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:39:09 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 04:08:29 GMT"
},
{
"version": "v3",
"created": "Sat, 26 Jul 2008 02:07:39 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Liu",
"Chang-Yong",
""
]
] |
0707.1383 | Paul Sutcliffe | Paul Sutcliffe | Vortex rings in ferromagnets | 13 pages, 6 figures | Physical Review B 76, 184439 (2007). | 10.1103/PhysRevB.76.184439 | null | cond-mat.mes-hall hep-ph hep-th | null | Vortex ring solutions are presented for the Landau-Lifshitz equation, which
models the dynamics of a three-dimensional ferromagnet. The vortex rings
propagate at constant speed along their symmetry axis and are characterized by
the integer-valued Hopf charge. They are stable to axial perturbations, but it
is demonstrated that an easy axis anisotropy results in an instability to
perturbations which break the axial symmetry. The unstable mode corresponds to
a migration of spin flips around the vortex ring that leads to a pinching
instability and ultimately the collapse of the vortex ring. It is found that
this instability does not exist for an isotropic ferromagnet. Similarities
between vortex rings in ferromagnets and vortons in cosmology are noted.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:41:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sutcliffe",
"Paul",
""
]
] |
0707.1384 | Dmitry Ivanenko Alexandrovich | Dmytro Ivanenko | Asymptotically Optimal Estimator of the Parameter of Semi-Linear
Autoregression | 10 pages | null | null | null | math.ST math.DS stat.AP stat.TH | null | The difference equations $\xi_{k}=af(\xi_{k-1})+\epsilon_{k}$, where
$(\epsilon_k)$ is a square integrable difference martingale, and the
differential equation ${\rm d}\xi=-af(\xi){\rm d}t+{\rm d}\eta$, where $\eta$
is a square integrable martingale, are considered. A family of estimators
depending, besides the sample size $n$ (or the observation period, if time is
continuous) on some random Lipschitz functions is constructed. Asymptotic
optimality of this estimators is investigated.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:48:06 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Ivanenko",
"Dmytro",
""
]
] |
0707.1385 | Annick Lleres | O. Bartalini, V. Bellini, J.P. Bocquet, P. calvat, M. Capogni, L.
Casano, M. Castoldi, A. D'Angelo, J.P. Didelez, R. Di Salvo, A. Fantini, D.
Franco, C. Gaulard, G. Gervino, F. Ghio, G. Giardina, B. Girolami, A. Giusa,
M. Guidal, E. Hourany, R. Kunne, A. Lapik, P. Levi Sandri, A. Lleres, F.
Mammoliti, G. Mandaglio, D. Moricciani, A.N. Mushkarenkov, V. Nedorezov, L.
Nicoletti, C. Perrin, C. Randieri, D. Rebreyend, F. Renard, N. Rudnev, T.
Russew, G. Russo, C. Schaerf, M.L. Sperduto, M.C. Sutera, A. Turinge, V.
Vegna (The GRAAL collaboration) | Measurement of eta photoproduction on the proton from threshold to 1500
MeV | 18 pages, 14 figures, 4 tables Submitted to EPJA | Eur.Phys.J.A33:169-184,2007 | 10.1140/epja/i2007-10439-9 | null | nucl-ex | null | Beam asymmetry and differential cross section for the reaction gamma+p->eta+p
were measured from production threshold to 1500 MeV photon laboratory energy.
The two dominant neutral decay modes of the eta meson, eta->2g and eta->3pi0,
were analyzed. The full set of measurements is in good agreement with
previously published results. Our data were compared with three models. They
all fit satisfactorily the results but their respective resonance contributions
are quite different. The possible photoexcitation of a narrow state N(1670) was
investigated and no evidence was found.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:49:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bartalini",
"O.",
"",
"The GRAAL collaboration"
],
[
"Bellini",
"V.",
"",
"The GRAAL collaboration"
],
[
"Bocquet",
"J. P.",
"",
"The GRAAL collaboration"
],
[
"calvat",
"P.",
"",
"The GRAAL collaboration"
],
[
"Capogni",
"M.",
"",
"The GRAAL collaboration"
],
[
"Casano",
"L.",
"",
"The GRAAL collaboration"
],
[
"Castoldi",
"M.",
"",
"The GRAAL collaboration"
],
[
"D'Angelo",
"A.",
"",
"The GRAAL collaboration"
],
[
"Didelez",
"J. P.",
"",
"The GRAAL collaboration"
],
[
"Di Salvo",
"R.",
"",
"The GRAAL collaboration"
],
[
"Fantini",
"A.",
"",
"The GRAAL collaboration"
],
[
"Franco",
"D.",
"",
"The GRAAL collaboration"
],
[
"Gaulard",
"C.",
"",
"The GRAAL collaboration"
],
[
"Gervino",
"G.",
"",
"The GRAAL collaboration"
],
[
"Ghio",
"F.",
"",
"The GRAAL collaboration"
],
[
"Giardina",
"G.",
"",
"The GRAAL collaboration"
],
[
"Girolami",
"B.",
"",
"The GRAAL collaboration"
],
[
"Giusa",
"A.",
"",
"The GRAAL collaboration"
],
[
"Guidal",
"M.",
"",
"The GRAAL collaboration"
],
[
"Hourany",
"E.",
"",
"The GRAAL collaboration"
],
[
"Kunne",
"R.",
"",
"The GRAAL collaboration"
],
[
"Lapik",
"A.",
"",
"The GRAAL collaboration"
],
[
"Sandri",
"P. Levi",
"",
"The GRAAL collaboration"
],
[
"Lleres",
"A.",
"",
"The GRAAL collaboration"
],
[
"Mammoliti",
"F.",
"",
"The GRAAL collaboration"
],
[
"Mandaglio",
"G.",
"",
"The GRAAL collaboration"
],
[
"Moricciani",
"D.",
"",
"The GRAAL collaboration"
],
[
"Mushkarenkov",
"A. N.",
"",
"The GRAAL collaboration"
],
[
"Nedorezov",
"V.",
"",
"The GRAAL collaboration"
],
[
"Nicoletti",
"L.",
"",
"The GRAAL collaboration"
],
[
"Perrin",
"C.",
"",
"The GRAAL collaboration"
],
[
"Randieri",
"C.",
"",
"The GRAAL collaboration"
],
[
"Rebreyend",
"D.",
"",
"The GRAAL collaboration"
],
[
"Renard",
"F.",
"",
"The GRAAL collaboration"
],
[
"Rudnev",
"N.",
"",
"The GRAAL collaboration"
],
[
"Russew",
"T.",
"",
"The GRAAL collaboration"
],
[
"Russo",
"G.",
"",
"The GRAAL collaboration"
],
[
"Schaerf",
"C.",
"",
"The GRAAL collaboration"
],
[
"Sperduto",
"M. L.",
"",
"The GRAAL collaboration"
],
[
"Sutera",
"M. C.",
"",
"The GRAAL collaboration"
],
[
"Turinge",
"A.",
"",
"The GRAAL collaboration"
],
[
"Vegna",
"V.",
"",
"The GRAAL collaboration"
]
] |
0707.1386 | L. A. Falkovsky | L.A. Falkovsky | Optical far-infrared properties of graphene monolayer and multilayers | 9 pages, 4 figures | null | 10.1103/PhysRevB.76.153410 | null | cond-mat.soft cond-mat.mes-hall | null | We analyze the features of the graphene mono- and multilayer reflectance in
the far-infrared region as a function of frequency, temperature, and carrier
density taking the intraband conductance and the interband electron absorbtion
into account. The dispersion of plasmon mode of the multilayers is calculated
using Maxwell's equations with the influence of retardation included. At low
temperatures and high electron densities, the reflectance of multilayers as a
function of frequency has the sharp downfall and the subsequent deep well due
to the threshold of electron interband absorbtion.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 08:49:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Falkovsky",
"L. A.",
""
]
] |
0707.1387 | Jesus Fernandez | Maria Alberich-Carraminana and Jesus Fernandez-Sanchez | Equisingularity classes of birational projections of normal
singularities to a plane | 22 pages, 3 figures. To appear in Advances in Mathematics | null | null | null | math.AG math.AC | null | Given a birational normal extension S of a two-dimensional local regular ring
R, we describe all the equisingularity types of the complete ideals J in R
whose blowing-up has some point at which the local ring is analytically
isomorphic to S.
The problem of classifying the germs of such normal surface singularities was
already posed by Spivakovsky (Ann. of Math. 1990). This problem has two parts:
discrete and continous. The continous part is to some extent equivalent to the
problem of the moduli of plane curve singularities, while the main result of
this paper solves completely the discrete part.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:47:53 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Alberich-Carraminana",
"Maria",
""
],
[
"Fernandez-Sanchez",
"Jesus",
""
]
] |
0707.1388 | Matthias Steinhauser | A.G. Grozin, P. Marquard, J.H. Piclum, M. Steinhauser | Three-Loop Chromomagnetic Interaction in HQET | 22 pages | Nucl.Phys.B789:277-293,2008 | 10.1016/j.nuclphysb.2007.08.012 | ALBERTA-THY-06-07, TTP07-14, SFB/CPP-07-35 | hep-ph | null | We compute the three-loop QCD corrections to the quark chromomagnetic moment
and thus obtain the matching coefficient and the anomalous dimension of the
chromomagnetic interaction in HQET. As a byproduct we obtain the three-loop
corrections to the quark anomalous magnetic moment.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:06:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grozin",
"A. G.",
""
],
[
"Marquard",
"P.",
""
],
[
"Piclum",
"J. H.",
""
],
[
"Steinhauser",
"M.",
""
]
] |
0707.1389 | Stefan Kolb | Stefan Kolb | The AS-Cohen-Macaulay property for quantum flag manifolds of minuscule
weight | LaTeX2e, 21 pages | null | null | null | math.QA | null | It is shown that quantum homogeneous coordinate rings of generalised flag
manifolds corresponding to minuscule weights, their Schubert varieties, big
cells, and determinantal varieties are AS-Cohen-Macaulay. The main ingredient
in the proof is the notion of a quantum graded algebra with a straightening
law, introduced by T.H. Lenagan and L. Rigal [J. Algebra 301 (2006), 670-702].
Using Stanley's Theorem it is moreover shown that quantum generalised flag
manifolds of minuscule weight and their big cells are AS-Gorenstein.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:40:38 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Kolb",
"Stefan",
""
]
] |
0707.1390 | Jan Reimann | Jan Reimann and Theodore Slaman | Probability Measures and Effective Randomness | 9 pages | null | null | null | math.LO | null | We study the question, ``For which reals $x$ does there exist a measure $\mu$
such that $x$ is random relative to $\mu$?'' We show that for every
nonrecursive $x$, there is a measure which makes $x$ random without
concentrating on $x$. We give several conditions on $x$ equivalent to there
being continuous measure which makes $x$ random. We show that for all but
countably many reals $x$ these conditions apply, so there is a continuous
measure which makes $x$ random. There is a meta-mathematical aspect of this
investigation. As one requires higher arithmetic levels in the degree of
randomness, one must make use of more iterates of the power set of the
continuum to show that for all but countably many $x$'s there is a continuous
$\mu$ which makes $x$ random to that degree.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:18:58 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Reimann",
"Jan",
""
],
[
"Slaman",
"Theodore",
""
]
] |
0707.1391 | Messad Azeddine | A. Messad | Tc oscillations in multilayered cuprates superconductors | 5 pages, Submitted to Physica C | null | null | null | cond-mat.supr-con | null | When combining the BCS expression of Tc with a shear modulus constant model,
we can demonstrate that Tc oscillates depending on the number of the cuprate
planes and that it reaches its first maximum for three planes. This is in good
agreement with experimental data and suggests that the electron- phonon
coupling is essential to the superconductivity of the cuprates.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:19:15 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 23:17:33 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Messad",
"A.",
""
]
] |
0707.1392 | Kwon Park | Bohm-Jung Yang, Yong Baek Kim, Jaejun Yu, and Kwon Park | Doped Valence Bond Solid and Superconductivity on the Shastry-Sutherland
Lattice | 10 pages, 6 figures | Phys. Rev. B 77, 104507 (2008) | 10.1103/PhysRevB.77.104507 | null | cond-mat.str-el cond-mat.supr-con | null | Motivated by recent experiments on SrCu$_2$(BO$_3$)$_2$, we investigate the
ground states of the doped Mott insulator on the Shastry-Sutherland lattice. To
provide a unified theoretical framework for both the valence-bond solid state
found in undoped SrCu$_2$(BO$_3$)$_2$ and the doped counterpart being pursued
in on-going experiments, we analyze the t-J-$V$ model via the bond operator
formulation. It is found that novel superconducting states emerge upon doping
with their properties crucially depending on the underlying valence bond order.
Implications to future experiments are discussed.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:28:55 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 07:54:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Bohm-Jung",
""
],
[
"Kim",
"Yong Baek",
""
],
[
"Yu",
"Jaejun",
""
],
[
"Park",
"Kwon",
""
]
] |
0707.1393 | Mikhail Plyushchay | Francisco Correa, Luis-Miguel Nieto, Mikhail S. Plyushchay | Hidden nonlinear su(2|2) superunitary symmetry of N=2 superextended 1D
Dirac delta potential problem | 11 pages; comments and refs. added, version published in PLB | Phys.Lett.B659:746-753,2008 | 10.1016/j.physletb.2007.11.046 | null | hep-th | null | We show that the N=2 superextended 1D quantum Dirac delta potential problem
is characterized by the hidden nonlinear $su(2|2)$ superunitary symmetry. The
unexpected feature of this simple supersymmetric system is that it admits three
different $\mathbb Z_2$-gradings, which produce a separation of 16 integrals of
motion into three different sets of 8 bosonic and 8 fermionic operators. These
three different graded sets of integrals generate two different nonlinear,
deformed forms of $su(2|2)$, in which the Hamiltonian plays a role of a
multiplicative central charge. On the ground state, the nonlinear superalgebra
is reduced to the two distinct 2D Euclidean analogs of a superextended
Poincar\'e algebra used earlier in the literature for investigation of
spontaneous supersymmetry breaking. We indicate that the observed exotic
supersymmetric structure with three different $\mathbb Z_2$-gradings can be
useful for the search of hidden symmetries in some other quantum systems, in
particular, related to the Lam\'e equation.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:29:51 GMT"
},
{
"version": "v2",
"created": "Sun, 22 Jul 2007 10:53:19 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Jan 2008 05:04:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Correa",
"Francisco",
""
],
[
"Nieto",
"Luis-Miguel",
""
],
[
"Plyushchay",
"Mikhail S.",
""
]
] |
0707.1394 | Yu-tin Huang | Yu-tin Huang, Warren Siegel | Running anti-de Sitter radius from QCD-like strings | 12 pages | JHEP 0709:112,2007 | 10.1088/1126-6708/2007/09/112 | YITP-SB-07-13 | hep-th | null | We consider renormalization effects for a bosonic QCD-like string, whose
partons have $1/p^{2}$ propagators instead of Gaussian. Classically this model
resembles (the bosonic part of) the projective light-cone (zero-radius) limit
of a string on an AdS${}_5$ background, where Schwinger parameters give rise to
the fifth dimension. Quantum effects generate dynamics for this dimension,
producing an AdS${}_5$ background with a running radius. The projective
light-cone is the high-energy limit: Holography is enforced dynamically.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 19:05:18 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Huang",
"Yu-tin",
""
],
[
"Siegel",
"Warren",
""
]
] |
0707.1395 | Regine Marchand | Jean-Baptiste Gouere (MAPMO), Regine Marchand (IECN) | Continuous first-passage percolation and continuous greedy paths model:
linear growth | 13 pages, two appendices | null | null | null | math.PR | null | We study a random growth model on $\R^d$ introduced by Deijfen. This is a
continuous first-passage percolation model. The growth occurs by means of
spherical outbursts with random radii in the infected region. We aim at finding
conditions on the distribution of the random radii to determine whether the
growth of the process is linear or not. To do so, we compare this model with a
continuous analogue of the greedy lattice paths model and transpose results in
the lattice setting to the continuous setting.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:41:07 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Gouere",
"Jean-Baptiste",
"",
"MAPMO"
],
[
"Marchand",
"Regine",
"",
"IECN"
]
] |
0707.1396 | Antonios Papazoglou | Eleftherios Papantonopoulos, Antonios Papazoglou and Vassilios
Zamarias | Induced cosmology on a regularized brane in six-dimensional flux
compactification | 19 pages, 3 figures, comments and references added, journal version | Nucl.Phys.B797:520-536,2008 | 10.1016/j.nuclphysb.2007.12.031 | null | hep-th gr-qc | null | We consider a six-dimensional Einstein-Maxwell system compactified in an
axisymmetric two-dimensional space with one capped regularized conical brane of
codimension one. We study the cosmological evolution which is induced on the
regularized brane as it moves in between known static bulk and cap solutions.
Looking at the resulting Friedmann equation, we see that the brane cosmology at
high energies is dominated by a five-dimensional rho^2 energy density term. At
low energies, we obtain a Friedmann equation with a term linear to the energy
density with, however, negative coefficient in the small four-brane radius
limit (i.e. with negative effective Newton's constant). We discuss ways out of
this problem.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 13:03:13 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 17:59:07 GMT"
},
{
"version": "v3",
"created": "Mon, 17 Dec 2007 01:40:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Papazoglou",
"Antonios",
""
],
[
"Zamarias",
"Vassilios",
""
]
] |
0707.1397 | Leonie Snijders | Leonie Snijders, Lisa J. Kewley and Paul P. van der Werf | Mid-infrared diagnostics of starburst galaxies: clumpy, dense structures
in star-forming regions in the Antennae (NGC 4038/4039) | 24 pages, 16 figures (3 in color), accepted for publication in ApJ | null | 10.1086/521522 | null | astro-ph | null | Recently, mid-infrared instruments have become available on several large
ground-based telescopes, resulting in data sets with unprecedented spatial
resolution at these long wavelengths. In this paper we examine
'ground-based-only' diagnostics, which can be used in the study of star-forming
regions in starburst galaxies. By combining output from the stellar population
synthesis code Starburst 99 with the photoionization code Mappings, we model
stellar clusters and their surrounding interstellar medium, focusing on the
evolution of emission lines in the N- and Q-band atmospheric windows (8-13 and
16.5-24.5 micron respectively) and those in the near-infrared. We address the
detailed sensitivity of various emission line diagnostics to stellar population
age, metallicity, nebular density, and ionization parameter. Using our model
results, we analyze observations of two stellar clusters in the overlap region
of the Antennae galaxies obtained with VLT Imager and Spectrometer for mid
Infrared (VISIR). We find evidence for clumpy, high density, ionized gas. The
two clusters are young (younger than 2.5 and 3 Myr respectively), the
surrounding interstellar matter is dense (10^4 cm^-3 or larger) and can be
characterized by a high ionization parameter (logU > -1.53). Detailed analysis
of the mid-infrared spectral features shows that a (near-)homogeneous medium
cannot account for the observations, and that complex structure on scales below
the resolution limit, containing several young stellar clusters embedded in
clumpy gas, is more likely.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:48:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Snijders",
"Leonie",
""
],
[
"Kewley",
"Lisa J.",
""
],
[
"van der Werf",
"Paul P.",
""
]
] |
0707.1398 | Florent Ravelet | Florent Ravelet (AHD), Rene Delfos (AHD), Jerry Westerweel (AHD) | Experimental studies of liquid-liquid dispersion in a turbulent shear
flow | 11th EUROMECH European Turbulence Conference, June 25-28, 2007.,
Porto : Portugal (2007) | null | null | null | physics.flu-dyn | null | We study liquid-liquid dispersions in a turbulent Taylor - Couette flow,
produced between two counterrotating coaxial cylinders. In pure Water and in
counterrotation, Reynolds numbers up to 1.4 10^5 are reached. We first
characterize the single-phase flow, in terms of threshold for transition to
turbulence, scaling of the torque and measurements of the mean flow and of the
Reynolds stress by stereoscopic PIV. We then study the increase of the
dissipation in the two-phase flows and find that the torque per unit mass can
be twice the torque for a single-phase flow. Long-time behaviours are also
reported.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:48:23 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jun 2008 09:53:20 GMT"
}
] | 2008-06-20T00:00:00 | [
[
"Ravelet",
"Florent",
"",
"AHD"
],
[
"Delfos",
"Rene",
"",
"AHD"
],
[
"Westerweel",
"Jerry",
"",
"AHD"
]
] |
0707.1399 | Nadia Lo | N. Lo (1 and 2), M. Cunningham (1), I. Bains (3), M. G. Burton (1) and
G. Garay (4) ((1) University of New South Wales, Australia, (2) Australia
Telescope National Facility, Australia, (3) Swinburne University of
Technology, Australia, (4) Universidad de Chile, Chile) | Detection of SiO emission from a massive dense cold core | 6 pages, 4 figures, 1 table, to be published in MNRAS | null | 10.1111/j.1745-3933.2007.00360.x | null | astro-ph | null | We report the detection of the SiO (J = 2 - 1) transition from the massive
cold dense core G333.125-0.562. The core remains undetected at wavelengths
shorter than 70 micron and has compact 1.2 mm dust continuum. The SiO emission
is localised to the core. The observations are part of a continuing
multi-molecular line survey of the giant molecular cloud G333. Other detected
molecules in the core include 13CO, C18O, CS, HCO+, HCN, HNC, CH3OH, N2H+, SO,
HC3N, NH3, and some of their isotopes. In addition, from NH3 (1,1) and (2,2)
inversion lines, we obtain a temperature of 13 K. From fitting to the spectral
energy distribution we obtain a colour temperature of 18 K and a gas mass of 2
x 10^3 solar mass. We have also detected a 22 GHz water maser in the core,
together with methanol maser emission, suggesting the core will host massive
star formation. We hypothesise that the SiO emission arises from shocks
associated with an outflow in the cold core.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:21:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lo",
"N.",
"",
"1 and 2"
],
[
"Cunningham",
"M.",
""
],
[
"Bains",
"I.",
""
],
[
"Burton",
"M. G.",
""
],
[
"Garay",
"G.",
""
]
] |
0707.1400 | Samy Skander Bahoura | Samy Skander Bahoura (UMSIHP) | Lower bounds for sup + inf and sup * inf and an Extension of Chen-Lin
result in dimension 3 | null | null | null | null | math.AP | null | We give two results about Harnack type inequalities. First, on compact smooth
Riemannian surface without boundary, we have an estimate of the type $\sup
+\inf$. The second result concerns the solutions of prescribed scalar curvature
equation on the unit ball of ${\mathbb R}^n$ with Dirichlet condition. Next, we
give an inequality of the type $(\sup_K u)^{2s-1} \times \inf_{\Omega} u \leq
c$ for positive solutions of $\Delta u=Vu^5$ on $\Omega \subset {\mathbb R}^3$,
where $K$ is a compact set of $\Omega$ and $V$ is $s-$ h\"olderian, $s\in
]-1/2,1]$. For the case $s=1/2$, we prove that if $\min_{\Omega} u>m>0$ and the
h\"olderian constant $A$ of $V$ is small enough (in certain meaning), we have
the uniform boundedness of the supremum of the solutions of the previous
equation on any compact set of $\Omega$.
-----
Nous donnons quelques estimations des solutions d'equations elliptiques sur
les surfaces de Riemann et sur des ouverts en dimension n> 2. Nous traitons le
cas holderien pour l'equation de la courbure scalaire prescrite en dimension 3.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 09:58:53 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Bahoura",
"Samy Skander",
"",
"UMSIHP"
]
] |
0707.1401 | Christian Sturm | Giampiero Passarino, Christian Sturm and Sandro Uccirati | Complete Two-Loop Corrections to H -> gamma gamma | 10 pages, 8 figures | Phys.Lett.B655:298-306,2007 | 10.1016/j.physletb.2007.09.002 | null | hep-ph | null | In this paper the complete two-loop corrections to the Higgs-boson decay, H
-> gamma gamma, are presented. The evaluations of both QCD and electroweak
corrections are based on a numerical approach. The results cover all
kinematical regions, including the WW normal-threshold, by introducing complex
masses in the relevant (gauge-invariant) parts of the LO and NLO amplitudes.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:32:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Passarino",
"Giampiero",
""
],
[
"Sturm",
"Christian",
""
],
[
"Uccirati",
"Sandro",
""
]
] |
0707.1402 | Alejandro Luque | Fabian Brau, Alejandro Luque, Bernard Meulenbroek, Ute Ebert and
Lothar Sch\"afer | Construction and test of a moving boundary model for negative streamer
discharges | 10 pages, 7 figures; submitted to Phys. Rev. E | Phys. Rev. E 77, 026219 (2008) | 10.1103/PhysRevE.77.026219 | null | physics.plasm-ph physics.flu-dyn | null | Starting from the minimal model for the electrically interacting particle
densities in negative streamer discharges, we derive a moving boundary
approximation for the ionization fronts. The boundary condition on the moving
front is found to be of 'kinetic undercooling' type. The boundary
approximation, whose first results have been published in [Meulenbroek et al.,
PRL 95, 195004 (2005)], is then tested against 2-dimensional simulations of the
density model. The results suggest that our moving boundary approximation
adequately represents the essential dynamics of negative streamer fronts.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:15:10 GMT"
}
] | 2008-03-03T00:00:00 | [
[
"Brau",
"Fabian",
""
],
[
"Luque",
"Alejandro",
""
],
[
"Meulenbroek",
"Bernard",
""
],
[
"Ebert",
"Ute",
""
],
[
"Schäfer",
"Lothar",
""
]
] |
0707.1403 | Monika Moscibrodzka | Monika Moscibrodzka, Daniel Proga, Bozena Czerny, Aneta Siemiginowska | Accretion of Low Angular Momentum Material onto Black Holes: Radiation
Properties of Axisymmetric MHD Flows | 18 pages,8 figures,accepted to A&A | null | 10.1051/0004-6361:20077703 | null | astro-ph | null | Numerical simulations of MHD accretion flows in the vicinity of a
supermasssive black hole provide important insights to the problem of why and
how systems -- such as the Galactic Center -- are underluminous and variable.
To access applicability of such flows to real objects, we examine the dynamical
MHD studies with computations of the time dependent radiation spectra predicted
by the simulations. We apply Monte Carlo methods to calculate spectra predicted
by the time-dependent model of an axisymmetic MHD flow accreting onto a black
hole presented by Proga and Begelman. Our calculations show that variability in
an accretion flow is not always reflected in the corresponding spectra, at
least not in all wavelengths. We find no one-to-one correspondence between the
accretion state and the predicted spectrum
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:18:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Moscibrodzka",
"Monika",
""
],
[
"Proga",
"Daniel",
""
],
[
"Czerny",
"Bozena",
""
],
[
"Siemiginowska",
"Aneta",
""
]
] |
0707.1404 | EL Kaoutit Laiachi | L. El Kaoutit and J. G\'omez-Torrecillas | Corings with exact rational functors and injective objects | null | null | null | null | math.RA | null | We describe how some aspects of abstract localization on module categories
have applications to the study of injective comodules over some special types
of corings. We specialize the general results to the case of Doi-Koppinen
modules, generalizing previous results in this setting.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:23:15 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Kaoutit",
"L. El",
""
],
[
"Gómez-Torrecillas",
"J.",
""
]
] |
0707.1405 | Voislav Golo | Voislav Golo, Efim Kats, Yuriy Volkov | Symmetries of Electrostatic Interaction between DNA Molecules | 13 pages, 4 figures | null | 10.1134/S002136400716014X | null | cond-mat.soft | null | We study a model for pair interaction $U$ of DNA molecules generated by the
discrete dipole moments of base-pairs and the charges of phosphate groups, and
find noncommutative group of eighth order ${\cal S}$ of symmetries that leave
$U$ invariant. We classify the minima using group ${\cal S}$ and employ
numerical methods for finding them. The minima may correspond to several
cholesteric phases, as well as phases formed by cross-like conformations of
molecules at an angle close to $\rm{90}^{o}$, "snowflake phase". The results
depend on the effective charge $Q$ of the phosphate group which can be modified
by the polycations or the ions of metals. The snowflake phase could exist for
$Q$ above the threshold $Q_C$. Below $Q_C$ there could be several cholesteric
phases. Close to $Q_C$ the snowflake phase could change into the cholesteric
one at constant distance between adjacent molecules.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:23:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Golo",
"Voislav",
""
],
[
"Kats",
"Efim",
""
],
[
"Volkov",
"Yuriy",
""
]
] |
0707.1406 | Jean Ginibre | J. Ginibre, G. Velo | Uniqueness at infinity in time for the Maxwell-Schr"odinger system with
arbitrarily large asymptotic data | latex 28 pages | null | null | LPT 07-38 | math.AP | null | We prove the uniqueness of solutions of the Maxwell-Schr"odinger system with
given asymptotic behaviour at infinity in time. The assumptions include
suitable restrictions on the growth of solutions for large time and on the
accuracy of their asymptotics, but no restriction on their size. The result
applies to the solutions with prescribed asymptotics constructed in a previous
paper.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:30:11 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Ginibre",
"J.",
""
],
[
"Velo",
"G.",
""
]
] |
0707.1407 | Stefan Bornholdt | Stefan Braunewell and Stefan Bornholdt | Reliability of genetic networks is evolvable | 5 pages, 3 figures | null | 10.1103/PhysRevE.77.060902 | null | q-bio.MN | null | Control of the living cell functions with remarkable reliability despite the
stochastic nature of the underlying molecular networks -- a property presumably
optimized by biological evolution. We here ask to what extent the property of a
stochastic dynamical network to produce reliable dynamics is an evolvable
trait. Using an evolutionary algorithm based on a deterministic selection
criterion for the reliability of dynamical attractors, we evolve dynamical
networks of noisy discrete threshold nodes. We find that, starting from any
random network, reliability of the attractor landscape can often be achieved
with only few small changes to the network structure. Further, the evolvability
of networks towards reliable dynamics while retaining their function is
investigated and a high success rate is found.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 19:56:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Braunewell",
"Stefan",
""
],
[
"Bornholdt",
"Stefan",
""
]
] |
0707.1408 | Marcus Pivato | Marcus Pivato | Module Shifts and Measure Rigidity in Linear Cellular Automata | 11 pages | null | null | null | math.DS | null | Suppose R is a finite commutative ring of prime characteristic, A is a finite
R-module, M:=Z^D x N^E, and F is an R-linear cellular automaton on A^M. If mu
is an F-invariant measure which is multiply shift-mixing in a certain way, then
we show that mu must be the Haar measure on a coset of some submodule shift of
A^M. Under certain conditions, this means mu must be the uniform Bernoulli
measure on A^M.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:42:00 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Pivato",
"Marcus",
""
]
] |
0707.1409 | Rui Vilela-Mendes | Elena Floriani, R. Lima and R. Vilela Mendes | Poisson-Vlasov : Stochastic representation and numerical codes | 17 pages, 5 figures | European Physical Journal D 46 (2008) 295-302 and 407 | 10.1140/epjd/e2007-00326-y | null | physics.plasm-ph | null | A stochastic representation for the solutions of the Poisson-Vlasov equation,
with several charged species, is obtained. The representation involves both an
exponential and a branching process and it provides an intuitive
characterization of the nature of the solutions and its fluctuations. Here, the
stochastic representation is also proposed as a tool for the numerical
evaluation of the solutions
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:45:25 GMT"
}
] | 2010-08-31T00:00:00 | [
[
"Floriani",
"Elena",
""
],
[
"Lima",
"R.",
""
],
[
"Mendes",
"R. Vilela",
""
]
] |
0707.1410 | Pranaw Rungta | Pranaw Rungta | The quadratic speedup in Grover's search algorithm from the entanglement
perspective | 23 pages, 2 figures | null | null | null | quant-ph | null | We analyze the role played by entanglement in the dynamical evolution of
Grover's search algorithm in the space of qubits. We show that the algorithm
can be equivalently described as an iterative change of the entanglement
between the qubits, which governs the evolution of the initial state towards
the target state, and where the entanglement can be quantified in terms a
single entanglement monotone. We also provide a necessary and sufficient
condition for the quadratic speedup, which illustrates how the change in the
bipartite entanglement of the state after each iteration determines the
corresponding increase in the probability of finding the target state. This
allows us to reestablish from the entanglement perspective that Grover's search
algorithm is the only optimal pure state search algorithm.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:56:31 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Rungta",
"Pranaw",
""
]
] |
0707.1411 | Nikolaus Witte Dr. | Nikolaus Witte | Constructing Simplicial Branched Covers | 15 pages, 8 figures, typos corrected and conjecture added | null | null | null | math.CO math.GT | null | Branched covers are applied frequently in topology - most prominently in the
construction of closed oriented PL d-manifolds. In particular, strong bounds
for the number of sheets and the topology of the branching set are known for
dimension d<=4. On the other hand, Izmestiev and Joswig described how to obtain
a simplicial covering space (the partial unfolding) of a given simplicial
complex, thus obtaining a simplicial branched cover [Adv. Geom. 3(2):191-255,
2003]. We present a large class of branched covers which can be constructed via
the partial unfolding. In particular, for d<=4 every closed oriented PL
d-manifold is the partial unfolding of some polytopal d-sphere.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 10:59:32 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 15:39:13 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Witte",
"Nikolaus",
""
]
] |
0707.1412 | Fabian Radoux | P. Mathonet, F. Radoux | On natural and conformally equivariant quantizations | 19 pages | null | 10.1112/jlms/jdp024 | null | math.DG | null | The concept of conformally equivariant quantizations was introduced by Duval,
Lecomte and Ovsienko in \cite{DLO} for manifolds endowed with flat conformal
structures. They obtained results of existence and uniqueness (up to
normalization) of such a quantization procedure. A natural generalization of
this concept is to seek for a quantization procedure, over a manifold $M$, that
depends on a pseudo-Riemannian metric, is natural and is invariant with respect
to a conformal change of the metric. The existence of such a procedure was
conjectured by P. Lecomte in \cite{Leconj} and proved by C. Duval and V.
Ovsienko in \cite{DO1} for symbols of degree at most 2 and by S. Loubon Djounga
in \cite{Loubon} for symbols of degree 3. In two recent papers \cite{MR,MR1},
we investigated the question of existence of projectively equivariant
quantizations using the framework of Cartan connections. Here we will show how
the formalism developed in these works adapts in order to deal with the
conformally equivariant quantization for symbols of degree at most 3. This will
allow us to easily recover the results of \cite{DO1} and \cite{Loubon}. We will
then show how it can be modified in order to prove the existence of conformally
equivariant quantizations for symbols of degree 4.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:26:06 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Mathonet",
"P.",
""
],
[
"Radoux",
"F.",
""
]
] |
0707.1413 | Andrey L. Pankratov | A.L. Pankratov | Minimizing the linewidth of the Flux-Flow Oscillator | 4 pages, 6 figures | null | 10.1063/1.2839605 | null | cond-mat.supr-con cond-mat.stat-mech | null | For the first time the linewidth of Flux-Flow Oscillator has been calculated
by direct computer simulation of the sine-Gordon equation with noise. Nearly
perfect agreement of the numerical results with the formula derived in [Phys.
Rev. B, {\bf 65}, 054504 (2002)] has been achieved. It has been demonstrated
that for homogeneous bias current distribution the linewidth actually does not
depend on the junction length for practically interesting parameters range.
Depending on the length of the unbiased tail, the power may be maximized and
the linewidth may be minimized in a broad range of bias currents. The linewidth
can be decreased further by 1.5 times by proper load matching.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:26:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pankratov",
"A. L.",
""
]
] |
0707.1414 | Florent Ravelet | Florent Ravelet (AHD), Rene Delfos (AHD), Jerry Westerweel (AHD) | Experimental studies of turbulent Taylor-Couette flows: single phase and
liquid-liquid dispersions | 5th International Symposium on Turbulence and Shear Flow Phenomena,
Munich : Allemagne (2007) | null | null | null | physics.flu-dyn | null | We study liquid-liquid dispersions in a turbulent Taylor-Couette flow,
produced between two counterrotating coaxial cylinders. In pure Water and in
counterrotation, Reynolds numbers up to 1.4 10^5 are reached. The liquids we
use are a low-viscous Oil and pure Water or a Sodium Iodide solution with a
refractive index matched to that of Oil, in order to get transparent
dispersions. We first characterize the single-phase flow, in terms of threshold
for transition to turbulence, scaling of the torque and measurements of the
mean flow and of the Reynolds stress by stereoscopic PIV. We then study the
increase of the dissipation in the two-phase flows and find that the torque per
unit mass can be twice the torque for a single-phase flow. Long-time behaviours
are also reported.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:27:12 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jun 2008 11:14:35 GMT"
}
] | 2008-06-20T00:00:00 | [
[
"Ravelet",
"Florent",
"",
"AHD"
],
[
"Delfos",
"Rene",
"",
"AHD"
],
[
"Westerweel",
"Jerry",
"",
"AHD"
]
] |
0707.1415 | Nikolaus Witte Dr. | Nikolaus Witte | Constructing Combinatorial 4-Manifolds | Stronger results and a shorter proof are presented in "Constructing
Simplicial Branched Covers" by the author. Nevertheless we present some
interesting techniques and a combinatorial analog of the (topological) proof
by Piergallini | null | null | null | math.CO math.GT | null | Every closed oriented PL 4-manifold is a branched cover of the 4-sphere
branched over a PL-surface with finitely many singularities by Piergallini
[Topology 34(3):497-508, 1995]. This generalizes a long standing result by
Hilden and Montesinos to dimension four. Izmestiev and Joswig [Adv. Geom.
3(2):191-225, 2003] gave a combinatorial equivalent of the Hilden and
Montesinos result, constructing closed oriented combinatorial 3-manifolds as
simplicial branched covers of combinatorial 3-spheres. The construction of
Izmestiev and Joswig is generalized and applied to the result of Piergallini,
obtaining closed oriented combinatorial 4-manifolds as simplicial branched
covers of simplicial 4-spheres.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:59:48 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Witte",
"Nikolaus",
""
]
] |
0707.1416 | Finelli Fabio | F. Finelli, G. Marozzi, G. P. Vacca, G. Venturi | The Impact of Ultraviolet Regularization on the Spectrum of Curvature
Perturbations During Inflation | 7 pages, 4 figures | Phys.Rev.D76:103528,2007 | 10.1103/PhysRevD.76.103528 | null | hep-th astro-ph | null | Inflationary predictions based on the linear theory of cosmological
perturbations are related to the two point function of a (second quantized)
real scalar free field during the accelerated stage. Such a two point function
is finite, in contrast with its coincidence limit, which is divergent due to
the ultraviolet divergences proper of field theory. We therefore argue that
predictions of most of the inflationary models do not necessarily need a
regularization scheme to leading order, i.e. tree level, which is required
instead for non-linear corrections or calculations involving the
energy-momentum tensor. We also discuss unpleasant features of the "would be"
regularized spectrum obtained using the traditional fourth order adiabatic
subtraction.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 15:46:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Finelli",
"F.",
""
],
[
"Marozzi",
"G.",
""
],
[
"Vacca",
"G. P.",
""
],
[
"Venturi",
"G.",
""
]
] |
0707.1417 | Santanu Dey | Santanu Dey and Rolf Gohm | Characteristic Functions of Liftings | 31 pages | null | null | null | math.OA | null | We introduce characteristic functions for certain contractive liftings of row
contractions. These are multi-analytic operators which classify the liftings up
to unitary equivalence and provide a kind of functional model. The most
important cases are subisometric and coisometric liftings. We also identify the
most general setting which we call reduced liftings. We derive properties of
these new characteristic functions and discuss the relation to Popescu's
definition for completely non-coisometric row contractions. Finally we apply
our theory to completely positive maps and prove a one-to-one correspondence
between the fixed point sets of completely positive maps related to each other
by a subisometric lifting.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:51:14 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Dey",
"Santanu",
""
],
[
"Gohm",
"Rolf",
""
]
] |
0707.1418 | Mohammad Abolghasemi | M. Abolghasemi, A. Rejali, H. R. E. Vishki | On the transformation semitopological semigroup | 10 pages published in international mathematical forum | null | null | null | math.FA | null | In this paper we introduce the notion of weighted (weakly) almost periodic
compactifcation of a semitopological semigroup and generalize this notion to
corresponding notion for transformation semigroup.The inclusion relation and
equality of some well known function spaces on a weighted transformation
semigroup is also investigated.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 11:53:20 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Abolghasemi",
"M.",
""
],
[
"Rejali",
"A.",
""
],
[
"Vishki",
"H. R. E.",
""
]
] |
0707.1419 | Nikolai Krasnikov | N. V. Krasnikov | Unparticle as a field with continuously distributed mass | 6 pages, added references, corrected typos | Int.J.Mod.Phys.A22:5117-5120,2007 | 10.1142/S0217751X07037342 | null | hep-ph | null | We point out that the notion of an unparticle, recently introduced by Georgi,
can be interpreted as a particular case of a field with continuously
distributed mass considered in ref.\cite{14}. We also point out that the
simplest renormalizable extension of the $SU_c(3)\otimes SU_L(2)\otimes U(1)$
Standard Model is the extension with the replacement of the U(1) gauge
propagator $\frac{1}{k^2} \to \frac{1}{k^2} + \int
_0^{\infty}\frac{\rho(t)}{-t+k^2 +i\epsilon}dt$ with $\int_0^{\infty}\rho(t)dt
< \infty $.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:36:49 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 09:19:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Krasnikov",
"N. V.",
""
]
] |
0707.1420 | Jaiyeola Temitope Gbolahan | Temitope Gbolahan Jaiyeola | Parastrophic invariance of Smarandache quasigroups | 8 pages | Scientia Magna Journal, Vol. 2, No. 3 (2006), pp. 48-53 | null | null | math.GM | null | Every quasigroup $(L,\cdot)$ belongs to a set of 6 quasigroups, called
parastrophes denoted by $(L,\pi_i)$, $i\in \{1,2,3,4,5,6\}$. It is shown that
$(L,\pi_i)$ is a Smarandache quasigroup with associative subquasigroup
$(S,\pi_i) \forall i\in \{1,2,3,4,5,6\}$ if and only if for any of some four
$j\in \{1,2,3,4,5,6\}$, $(S,\pi_j)$ is an isotope of $(S,\pi_i)$ or $(S,\pi_k)$
for one $k\in \{1,2,3,4,5,6\}$ such that $i\ne j\ne k$. Hence, $(L,\pi_i)$ is a
Smarandache quasigroup with associative subquasigroup $(S,\pi_i) \forall i\in
\{1,2,3,4,5,6\}$ if and only if any of the six Khalil conditions is true for
any of some four of $(S,\pi_i)$.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:02:40 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Jaiyeola",
"Temitope Gbolahan",
""
]
] |
0707.1421 | S. Kalyana Rama | S. Kalyana Rama | Consequences of U dualities for Intersecting Branes in the Universe | 15 pages. Latex file. Version 2: A couple of points clarified; a few
typos corrected. To appear in Physics Letters B | Phys.Lett.B656:226-232,2007 | 10.1016/j.physletb.2007.09.069 | IMSc/2007/07/09 | hep-th astro-ph gr-qc | null | We consider N -- charge, intersecting brane antibrane configurations in M
theory which are smeared uniformly in the common transverse space and may
describe our universe. We study the consequences of U dualities and find that
they imply relations among the scale factors. We find using Einstein's
equations that U dualities also imply a relation among the density \rho and the
pressure p_i for the single charge case. We present an ansatz for \rho and p_i
for the N -- charge case which yields all the U duality relations among the
scale factors. We then study configurations with identical charges, and also
with net charges vanishing. We find among other things that, independent of the
details of the brane antibrane dynamics, such four charge configurations lead
asymptotically to an effective (3 + 1) -- dimensional expanding universe.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:04:11 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 04:01:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Rama",
"S. Kalyana",
""
]
] |
0707.1422 | Harvendra Singh | Shibaji Roy and Harvendra Singh | Alpha-prime corrections to space-like branes | 18 pp; v2: Major changes in the constant dilaton backgrounds and some
sections are rearranged | JHEP 0710:007,2007 | 10.1088/1126-6708/2007/10/007 | null | hep-th | null | Space-like branes or S-branes are certain class of time dependent solutions
of M/string theories having isometries ISO(p+1) $\times$ SO(d-p-2,1), where
$d=11,10$ respectively and have singularities at t=0. In \cite{Roy:2006du}, we
found that the asymptotically flat S-branes have the structure of generalized
Kasner geometry near t=0. In this work we evaluate higher order $\alpha'$
corrections perturbatively to the heterotic string Kasner backgrounds to probe
the singularity at t=0. We generally find that the perturbative corrections do
not permit us to reach the singular point, as the supergravity framework fails
near $t \sim {\sqrt \alpha'}$ blurring the origin of space-like singularities.
This is analogous to the concept of stretched horizons in the case of black
holes.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:10:44 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 10:00:37 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Roy",
"Shibaji",
""
],
[
"Singh",
"Harvendra",
""
]
] |
0707.1423 | Jaiyeola Temitope Gbolahan | Temitope Gbolahan Jaiyeola | Smarandache Isotopy Theory Of Smarandache: Quasigroups And Loops | 11 pages | Proceedings of the 4th International Conference on Number Theory
and Smarandache Problems, Scientia Magna Journal. Vol. 4, No. 1(2008),
168-177 | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of Smarandache isotopy is introduced and its study is explored
for Smarandache: groupoids, quasigroups and loops just like the study of
isotopy theory was carried out for groupoids, quasigroups and loops. The
exploration includes: Smarandache; isotopy and isomorphy classes, Smarandache
$f,g$ principal isotopes and G-Smarandache loops.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:10:56 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 19:02:50 GMT"
},
{
"version": "v3",
"created": "Thu, 5 Jun 2008 09:05:47 GMT"
}
] | 2008-06-05T00:00:00 | [
[
"Jaiyeola",
"Temitope Gbolahan",
""
]
] |
0707.1424 | A. Gomez Nicola | D.Fernandez-Fraile, A.Gomez Nicola, E.T.Herruzo | Pion scattering poles and chiral symmetry restoration | 17 pages, 9 figures, final version to appear in Phys.Rev.D, added
comments and references | Phys.Rev.D76:085020,2007 | 10.1103/PhysRevD.76.085020 | null | hep-ph | null | Using unitarized Chiral Perturbation Theory methods, we perform a detailed
analysis of the $\pi\pi$ scattering poles $f_0(600)$ and $\rho(770)$ behaviour
when medium effects such as temperature or density drive the system towards
Chiral Symmetry Restoration. In the analysis of real poles below threshold, we
show that it is crucial to extend properly the unitarized amplitudes so that
they match the perturbative Adler zeros. Our results do not show threshold
enhancement effects at finite temperature in the $f_0(600)$ channel, which
remains as a pole of broad nature. We also implement T=0 finite density effects
related to chiral symmetry restoration, by varying the pole position with the
pion decay constant. Although this approach takes into account only a limited
class of contributions, we reproduce the expected finite density restoration
behaviour, which drives the poles towards the real axis, producing threshold
enhancement and $\pi\pi$ bound states. We compare our results with several
model approaches and discuss the experimental consequences, both in
Relativistic Heavy Ion Collisions and in $\pi\to \pi\pi$ and $\gamma\to \pi\pi$
reactions in nuclei.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:29:37 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Sep 2007 13:21:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fernandez-Fraile",
"D.",
""
],
[
"Nicola",
"A. Gomez",
""
],
[
"Herruzo",
"E. T.",
""
]
] |
0707.1425 | Olaf Kittel | H. K. Dreiner, S. Heinemeyer, O. Kittel, U. Langenfeld, A. M. Weber,
and G. Weiglein | How light can the lightest neutralino be? | 4 pages, 3 figures, Proceedings for the LCWS/ILC 2007 workshop at
DESY, Hamburg, Germany; reference added, author name corrected | ECONF C0705302:SUS06,2007 | null | IPPP/07/27, DCPT/07/54, BONN-TH-2007-03 | hep-ph | null | We show that in the Minimal Supersymmetric Standard Model, the mass of the
lightest neutralino is experimentally unconstrained if the GUT relation between
the gaugino mass parameters M_1 and M_2 is dropped. We discuss what the impact
of light or massless neutralinos would be on their production at LEP, as well
as on electroweak precision data and rare decays.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:24:46 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 12:20:20 GMT"
}
] | 2009-02-16T00:00:00 | [
[
"Dreiner",
"H. K.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Kittel",
"O.",
""
],
[
"Langenfeld",
"U.",
""
],
[
"Weber",
"A. M.",
""
],
[
"Weiglein",
"G.",
""
]
] |
0707.1426 | Masato Minamitsuji | Masato Minamitsuji and David Langlois | Cosmological evolution of regularized branes in 6D warped flux
compactifications | 14 pages, 4 figures, references and discussions added, to appear in
PRD | Phys.Rev.D76:084031,2007 | 10.1103/PhysRevD.76.084031 | null | hep-th astro-ph gr-qc | null | We study the cosmological evolution of extended branes in 6D warped flux
compactification models. The branes are endowed with the three ordinary spatial
dimensions, which are assumed to be homogeneous and isotropic, as well as an
internal extra dimension compactified on a circle. We embed these codimension 1
branes in a static bulk 6D spacetime, whose geometry is a solution of 6D
Einstein-Maxwell or Einstein-Maxwell-dilaton theories, corresponding to a
warped flux compactification. The brane matter consists of a complex scalar
field which is coupled to the bulk U(1) gauge field. In both models, we show
that there is critical point which the brane cannot cross as it moves in the
bulk. We study the cosmological behaviour, especially when the brane approaches
this critical point or one of the two conical singularities. In the present
setup where the bulk geometry is fixed, we find that the brane cosmology does
not coincide with the standard one in the low energy limit.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:28:04 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Oct 2007 08:16:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Minamitsuji",
"Masato",
""
],
[
"Langlois",
"David",
""
]
] |
0707.1427 | Brigitte Hiller | Alexander A. Osipov, Brigitte Hiller, Alex H. Blin | Analytic perturbation theory versus 1/N expansion in the Gross-Neveu
model | Latex, 3 figures, 4 pages | Phys.Lett.B653:346-349,2007 | 10.1016/j.physletb.2007.08.020 | null | hep-ph hep-th | null | The 1/N expansion can be successfully used to calculate the Green functions
of the two-dimensional O(2N) Gross - Neveu model. In parallel, the methods of
analytic perturbation theory are also applied. Comparing the results of these
two calculations at leading order, we report on the surprising agreement
between them.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:41:28 GMT"
}
] | 2007-09-20T00:00:00 | [
[
"Osipov",
"Alexander A.",
""
],
[
"Hiller",
"Brigitte",
""
],
[
"Blin",
"Alex H.",
""
]
] |
0707.1428 | Vladimir Tretyak | A.N.Annenkov, O.A.Buzanov, F.A.Danevich, A.Sh.Georgadze, S.K.Kim,
H.J.Kim, Y.D.Kim, V.V.Kobychev, V.N.Kornoukhov, M.Korzhik, J.I.Lee,
O.Missevitch, V.M.Mokina, S.S.Nagorny, A.S.Nikolaiko, D.V.Poda,
R.B.Podviyanuk, D.J.Sedlak, O.G.Shkulkova, J.H.So, I.M.Solsky, V.I.Tretyak,
S.S.Yurchenko | Development of CaMoO4 crystal scintillators for double beta decay
experiment with 100-Mo | 24 pages | Nucl.Instrum.Meth.A584:334-345,2008 | 10.1016/j.nima.2007.10.038 | null | nucl-ex | null | Energy resolution, alpha/beta ratio, pulse-shape discrimination for gamma
rays and alpha particles, temperature dependence of scintillation properties,
and radioactive contamination were studied with CaMoO4 crystal scintillators. A
high sensitivity experiment to search for neutrinoless double beta decay of
100-Mo by using CaMoO4 scintillators is discussed.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:45:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Annenkov",
"A. N.",
""
],
[
"Buzanov",
"O. A.",
""
],
[
"Danevich",
"F. A.",
""
],
[
"Georgadze",
"A. Sh.",
""
],
[
"Kim",
"S. K.",
""
],
[
"Kim",
"H. J.",
""
],
[
"Kim",
"Y. D.",
""
],
[
"Kobychev",
"V. V.",
""
],
[
"Kornoukhov",
"V. N.",
""
],
[
"Korzhik",
"M.",
""
],
[
"Lee",
"J. I.",
""
],
[
"Missevitch",
"O.",
""
],
[
"Mokina",
"V. M.",
""
],
[
"Nagorny",
"S. S.",
""
],
[
"Nikolaiko",
"A. S.",
""
],
[
"Poda",
"D. V.",
""
],
[
"Podviyanuk",
"R. B.",
""
],
[
"Sedlak",
"D. J.",
""
],
[
"Shkulkova",
"O. G.",
""
],
[
"So",
"J. H.",
""
],
[
"Solsky",
"I. M.",
""
],
[
"Tretyak",
"V. I.",
""
],
[
"Yurchenko",
"S. S.",
""
]
] |
0707.1429 | Luis Eduardo Sola Conde | Roberto Munoz, Jose Carlos Sierra and Luis Eduardo Sola Conde | Tangential projections and secant defective varieties | To appear in Bulletin of the London Mathematical Society | Bull. London Math. Soc. 39 (2007), pp. 949-961 | null | null | math.AG | null | Going one step further in Zak's classification of Scorza varieties with
secant defect equal to one, we characterize the Veronese embedding of $\P^n$
given by the complete linear system of quadrics and its smooth projections from
a point as the only smooth irreducible complex and non-degenerate projective
subvarieties of $\P^N$ that can be projected isomorphically into $\P^{2n}$ when
$N\geq\binom{n+2}{2}-2$.
| [
{
"version": "v1",
"created": "Tue, 10 Jul 2007 12:47:05 GMT"
}
] | 2014-07-23T00:00:00 | [
[
"Munoz",
"Roberto",
""
],
[
"Sierra",
"Jose Carlos",
""
],
[
"Conde",
"Luis Eduardo Sola",
""
]
] |
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