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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.4530 | Hiroki Saito | Hiroki Saito, Randall G. Hulet, Masahito Ueda | Stabilization of a Bose-Einstein droplet by hyperfine Rabi oscillations | 6 pages, 2 figures | Phys. Rev. A 76, 053619 (2007) | 10.1103/PhysRevA.76.053619 | null | cond-mat.other | null | A self-trapped Bose-Einstein condensate is shown to be stabilized in
two-dimensional free space by Rabi oscillations between two hyperfine states
which make an effective interatomic interaction oscillate in time. The
stabilization mechanism is elucidated by using a two-component Gross-Pitaevskii
equation combined with a variational analysis. The parameter regime of
stability is investigated.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 04:40:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saito",
"Hiroki",
""
],
[
"Hulet",
"Randall G.",
""
],
[
"Ueda",
"Masahito",
""
]
] |
0707.4531 | Akihiro Ogura | Akihiro Ogura and Motoo Sekiguchi | Algebraic structure of the Feynman propagator and a new correspondence
for canonical transformations | null | J. Math. Phys. 48, 072102 (2007) | 10.1063/1.2748378 | null | quant-ph | null | We investigate the algebraic structure of the Feynman propagator with a
general time-dependent quadratic Hamiltonian system. Using the Lie-algebraic
technique we obtain a normal-ordered form of the time-evolution operator, and
then the propagator is easily derived by a simple ``Integration Within Ordered
Product" (IWOP) technique.It is found that this propagator contains a classical
generating function which demonstrates a new correspondence between classical
and quantum mechanics.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 04:55:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ogura",
"Akihiro",
""
],
[
"Sekiguchi",
"Motoo",
""
]
] |
0707.4532 | Anthony Bollinger | A. T. Bollinger, R. C. Dinsmore III, A. Rogachev, and A. Bezryadin | Determination of the Superconductor-Insulator Phase Diagram for
One-Dimensional Wires | 5 pages, 4 figures | null | 10.1103/PhysRevLett.101.227003 | null | cond-mat.supr-con | null | We establish the superconductor-insulator phase diagram for quasi-one
dimensional wires by measuring a large set of MoGe nanowires. This diagram is
consistent with the Chakravarty-Schmid-Bulgadaev phase boundary, namely with
the critical resistance being equal to R_Q = h/4e^2. We find that transport
properties of insulating nanowires exhibit a weak Coulomb blockade behavior.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 04:56:21 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 02:14:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bollinger",
"A. T.",
""
],
[
"Dinsmore",
"R. C.",
"III"
],
[
"Rogachev",
"A.",
""
],
[
"Bezryadin",
"A.",
""
]
] |
0707.4533 | Nicholas Guttenberg | Nicholas Guttenberg and Nigel Goldenfeld | Cascade of Complexity in Evolving Predator-Prey Dynamics | 5 pages, 3 figures; added comments on system size scaling and
turbulence analogy, added error estimates of data collapse parameters.
Slightly enhanced from the version which will appear in PRL | null | 10.1103/PhysRevLett.100.058102 | null | q-bio.PE | null | We simulate an individual-based model that represents both the phenotype and
genome of digital organisms with predator-prey interactions. We show how
open-ended growth of complexity arises from the invariance of genetic evolution
operators with respect to changes in the complexity, and that the dynamics
which emerges is controlled by a non-equilibrium critical point. The mechanism
is analogous to the development of the cascade in fluid turbulence.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 05:00:30 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 13:38:51 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Dec 2007 22:26:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Guttenberg",
"Nicholas",
""
],
[
"Goldenfeld",
"Nigel",
""
]
] |
0707.4534 | Srihari Keshavamurthy | Paranjothy Manikandan and Srihari Keshavamurthy | Intramolecular vibrational energy redistribution from a high frequency
mode in the presence of an internal rotor: Classical thick-layer diffusion
and quantum localization | To appear in J. Chem. Phys. (August 28, 2007); 4 pages and 3 figures | null | 10.1063/1.2768528 | null | physics.chem-ph nlin.CD | null | We study the effect of an internal rotor on the classical and quantum
intramolecular vibrational energy redistribution (IVR) dynamics of a model
system with three degrees of freedom. The system is based on a Hamiltonian
proposed by Martens and Reinhardt (J. Chem. Phys. {\bf 93}, 5621 (1990).) to
study IVR in the excited electronic state of para-fluorotoluene. We explicitly
construct the state space and show, confirming the mechanism proposed by
Martens and Reinhardt, that an excited high frequency mode relaxes via
diffusion along a thick layer of chaos created by the low frequency-rotor
interactions. However, the corresponding quantum dynamics exhibits no
appreciable relaxation of the high frequency mode. We attribute the quantum
suppression of the classical thick-layer diffusion to the rotor selection rules
and, possibly, dynamical localization effects.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 05:20:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Manikandan",
"Paranjothy",
""
],
[
"Keshavamurthy",
"Srihari",
""
]
] |
0707.4535 | Theo Costi | T. A. Costi, A. Liebsch | Quantum phase transition in the two-band Hubbard model | 4 pages, 4 eps figures, revised version, to appear in Phys. Rev. Lett | Phys. Rev. Lett. 99, 236404 (2007) | 10.1103/PhysRevLett.99.236404 | null | cond-mat.str-el | null | The interaction between itinerant and Mott localized electronic states in
strongly correlated materials is studied within dynamical mean field theory in
combination with the numerical renormalization group method. A novel
nonmagnetic zero temperature quantum phase transition is found in the
bad-metallic orbital-selective Mott phase of the two-band Hubbard model, for
values of the Hund's exchange which are relevant to typical transition metal
oxides.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 05:36:39 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 15:05:40 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Costi",
"T. A.",
""
],
[
"Liebsch",
"A.",
""
]
] |
0707.4536 | Yoichi Nishiyama | Yoichi Nishiyama | On the paper ``Weak convergence of some classes of martingales with
jumps'' | Published at http://dx.doi.org/10.1214/009117906000000755 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 3, 1194-1200 | 10.1214/009117906000000755 | IMS-AOP-AOP0200 | math.PR | null | This note extends some results of Nishiyama [Ann. Probab. 28 (2000)
685--712]. A maximal inequality for stochastic integrals with respect to
integer-valued random measures which may have infinitely many jumps on compact
time intervals is given. By using it, a tightness criterion is obtained; if the
so-called quadratic modulus is bounded in probability and if a certain entropy
condition on the parameter space is satisfied, then the tightness follows. Our
approach is based on the entropy techniques developed in the modern theory of
empirical processes.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 05:39:04 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Nishiyama",
"Yoichi",
""
]
] |
0707.4537 | Yongge Ma | Jing Luan, Yongge Ma, Bo-Qiang Ma | State-Relevant Maxwell's Equation from Kaluza-Klein Theory | 11 pages, 3 figures; version published in PRD | Phys.Rev.D76:104008,2007 | 10.1103/PhysRevD.76.104008 | null | gr-qc astro-ph hep-th physics.flu-dyn physics.plasm-ph | null | We study a five-dimensional perfect fluid coupled with Kaluza-Klein (KK)
gravity. By dimensional reduction, a modified form of Maxwell's equation is
obtained, which is relevant to the equation of state of the source. Since the
relativistic magnetohydrodynamics (MHD) and the 3-dimensional formulation are
widely used to study space matter, we derive the modified Maxwell's equations
and relativistic MHD in 3+1 form. We then take an ideal Fermi gas as an example
to study the modified effect, which can be visible under high density or high
energy condition, while the traditional Maxwell's equation can be regarded as a
result in the low density and low temperature limit. We also indicate the
possibility to test the state-relevant effect of KK theory in a telluric
laboratory.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 05:46:42 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 09:40:56 GMT"
},
{
"version": "v3",
"created": "Thu, 8 Nov 2007 05:55:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Luan",
"Jing",
""
],
[
"Ma",
"Yongge",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
0707.4538 | Shuntaro Nakamura | Shuntaro Nakamura, Masahiro Yamaguchi | A Note on Polonyi Problem | 11 pages, 1 figure, references added | Phys.Lett.B655:167-171,2007 | 10.1016/j.physletb.2007.09.001 | TU-795 | hep-ph | null | We reinvestigate the cosmological Polonyi problem in the case where the
Polonyi mass is $\mathcal{O}(10) \rm{TeV}$. Such a large supersymmetry breaking
scale implies that the Polonyi field should be sequestered from the standard
model sector. Since the Polonyi field does not have a coupling to the gauge
multiplets at tree level, in order to obtain sufficiently high reheating
temperature compatible with the standard big-bang nucleosynthesis the Polonyi
mass well exceeds 100 - 1000 TeV, depending on the decay channels. Moreover, we
find that the branching ratio of the Polonyi field into neutralinos is of order
unity, and thus the resulting neutralino LSPs, if stable, overclose the
Universe even for the case of the wino-like LSP. Our explicit computation given
here exhibits a very serious cosmological difficulty for models where
supersymmetry breaking is caused by the Polonyi-type field.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 05:47:19 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 10:54:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nakamura",
"Shuntaro",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] |
0707.4539 | Vikram Zaveri | Vikram H. Zaveri | Periodic relativity: the theory of gravity in flat space time | 71 pages, 3 figures, 4 tables, v13: Gravitational-wave strain
amplitude is derived using quantum mechanical formalism | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In periodic relativity (PR), the curved space time of general relativity are
eliminated by making use of an alternative flat metric without weak field
approximation. PR satisfies Einstein's field equations. Theory allows every two
body system to deviate differently from the flat Minkowski metric. PR differs
from general relativity (GR) in predictions of the proper time intervals of
distant objects. PR proposes a definite connection between the proper time
interval of an object and Doppler frequency shift of its constituent particles
as the object makes a relative motion with respect to the rest frame of the
coordinate time. This is because fundamentally time is periodic in nature.
Coordinate and proper time in GR are linear time. Periodic time of PR is the
key parameter in development of quantum gravity theory in which the universe
begins with a quantum fluctuation in the fundamental substance of the universe
which is infinite, motionless and indivisible. PR is based on the dynamic weak
equivalence principle which equates the gravitational mass with the
relativistic mass. PR provides accurate solutions for the rotation curves of
galaxies and the energy levels of the Hydrogen spectra including Lamb shift
using common formalism. Flat space time with Lorentz invariant acceleration
presented here makes it possible to unite PR with quantum mechanics. PR
satisfies Einstein's field equations with respect to the three major GR tests
within the solar system and with respect to the derivation of Friedmann
equation in cosmology. PR predicts limiting radius of the event horizon of M87
black hole to be 3R_g and the range of prograde and retrograde spin a_* between
\pm0.385 and \pm0.73. Theory shows that the electromagnetic wave is held
together by gravitational forces. Gravitational-wave strain amplitude is
derived using quantum mechanical formalism.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:27:37 GMT"
},
{
"version": "v10",
"created": "Fri, 2 Oct 2020 07:52:24 GMT"
},
{
"version": "v11",
"created": "Sat, 10 Sep 2022 20:12:33 GMT"
},
{
"version": "v12",
"created": "Wed, 29 Mar 2023 08:13:07 GMT"
},
{
"version": "v13",
"created": "Thu, 10 Aug 2023 07:21:13 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 09:53:16 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Jan 2008 09:13:07 GMT"
},
{
"version": "v4",
"created": "Tue, 5 Feb 2008 10:39:13 GMT"
},
{
"version": "v5",
"created": "Fri, 16 May 2008 05:03:31 GMT"
},
{
"version": "v6",
"created": "Sat, 31 Oct 2009 06:24:13 GMT"
},
{
"version": "v7",
"created": "Fri, 24 Sep 2010 04:37:58 GMT"
},
{
"version": "v8",
"created": "Wed, 29 Aug 2012 07:42:17 GMT"
},
{
"version": "v9",
"created": "Tue, 25 Nov 2014 07:05:10 GMT"
}
] | 2023-08-14T00:00:00 | [
[
"Zaveri",
"Vikram H.",
""
]
] |
0707.4540 | John Webb | J. L. Christiansen (1), A. Derekas (2), M. C. B. Ashley (1), J. K.
Webb (1), M. G. Hidas (3 and 4), D. W. Hamacher (1) and L. L. Kiss (2) ((1)
University of NSW, Australia, (2) University of Sydney, Australia, (3) Las
Cumbres Observatory Global Telescope, US, (4) University of California, US) | The first high-amplitude delta Scuti star in an eclipsing binary system | 7 pages, 6 figures, 2 tables, for submission to MNRAS, v2: paper size
change, small typographical changes to abstract | null | 10.1111/j.1365-2966.2007.12338.x | null | astro-ph | null | We report the discovery of the first high-amplitude delta Scuti star in an
eclipsing binary, which we have designated UNSW-V-500. The system is an
Algol-type semi-detached eclipsing binary of maximum brightness V = 12.52 mag.
A best-fitting solution to the binary light curve and two radial velocity
curves is derived using the Wilson-Devinney code. We identify a late A spectral
type primary component of mass 1.49+/-0.02 M_sun and a late K spectral type
secondary of mass 0.33+/-0.02 M_sun, with an inclination of 86.5+/-1.0 degrees,
and a period of 5.3504751+/-0.0000006 d. A Fourier analysis of the residuals
from this solution is performed using PERIOD04 to investigate the delta Scuti
pulsations. We detect a single pulsation frequency of f_1 = 13.621+/-0.015 c/d,
and it appears this is the first overtone radial mode frequency. This system
provides the first opportunity to measure the dynamical mass for a star of this
variable type; previously, masses have been derived from stellar evolution and
pulsation models.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 06:26:15 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 23:27:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Christiansen",
"J. L.",
"",
"3 and 4"
],
[
"Derekas",
"A.",
"",
"3 and 4"
],
[
"Ashley",
"M. C. B.",
"",
"3 and 4"
],
[
"Webb",
"J. K.",
"",
"3 and 4"
],
[
"Hidas",
"M. G.",
"",
"3 and 4"
],
[
"Hamacher",
"D. W.",
""
],
[
"Kiss",
"L. L.",
""
]
] |
0707.4541 | Maria Concetta Maccarone | G. Cusumano (IASF-Palermo), G. Agnetta (IASF-Palermo), A. Alberdi
(IAA-Granada), M. Alvarez (DFAMN-US-Sevilla), P. Assis (LIP-Lisbon), B.
Biondo (IASF-Palermo), F. Bocchino (OA-Palermo), P. Brogueira (LIP-Lisbon),
J.A. Caballero (DFAMN-US-Sevilla), M. Carvajal (Univ. Huelva), A.J.
Castro-Tirado (IAA-Granada), O. Catalano (IASF-Palermo), F. Celi
(IASF-Palermo), C. Delgado (IAC-Tenerife), G. Di Cocco (IASF-Bologna), A.
Dominguez (DFAMN-US-Sevilla), J.M. Espino Navas (DFAMN-US-Sevilla), M.C.
Espirito Santo (LIP-Lisbon), M.I. Gallardo (DFAMN-US-Sevilla), J.E. Garcia
(Univ. Huelva), S. Giarrusso (IASF-Palermo), M. Gomez (Univ. Huelva), J.L.
Gomez (IAA-Granada), P. Goncalves (LIP-Lisbon), M. Guerriero (IAA-Granada),
A. La Barbera (IASF-Palermo), G. La Rosa (IASF-Palermo), M. Lozano
(DFAMN-US-Sevilla), M.C. Maccarone (IASF-Palermo), A. Mangano (IASF-Palermo),
I. Martel (Univ. Huelva), E. Massaro (Univ. La Sapienza-Roma), T. Mineo
(IASF-Palermo), M. Moles (IAA-Granada), F. Perez-Bernal (Univ. Huelva), M.A.
Peres-Torres (IAA-Granada), M. Pimenta (LIP-Lisbon), A. Pina (LIP-Lisbon), F.
Prada (IAA-Granada), J.M. Quesada (DFAMN-US-Sevilla), J.M. Quintana
(IAA-Granada), J.R. Quintero (Univ. Huelva), J. Rodriguez (Univ. Huelva), F.
Russo (IASF-Palermo), B. Sacco (IASF-Palermo), M.A. Sanchez-Conde
(IAA-Granada), A. Segreto (IASF-Palermo), B. Tome' (LIP-Lisbon), A. de Ugarte
Postigo (IAA-Granada), P. Vallania (IFSI-Torino) | GAW - An Imaging Atmospheric Cherenkov Telescope with Large Field of
View | 4 pages, 2 figures, PDF format, Proceedings of 30th ICRC,
International Cosmic Ray Conference 2007, Merida, Yucatan, Mexico, 3-11 July
2007 | null | null | null | astro-ph | null | GAW, acronym for Gamma Air Watch, is a Research and Development experiment in
the TeV range, whose main goal is to explore the feasibility of large field of
view Imaging Atmospheric Cherenkov Telescopes. GAW is an array of three
relatively small telescopes (2.13 m diameter) which differs from the existing
and presently planned projects in two main features: the adoption of a
refractive optics system as light collector and the use of single photoelectron
counting as detector working mode. The optics system allows to achieve a large
field of view (24x24 squared degrees) suitable for surveys of large sky
regions. The single photoelectron counting mode in comparison with the charge
integration mode improves the sensitivity by permitting also the reconstruction
of events with a small number of collected Cherenkov photons. GAW, which is a
collaboration effort of Research Institutes in Italy, Portugal and Spain, will
be erected in the Calar Alto Observatory (Sierra de Los Filabres - Andalucia,
Spain), at 2150 m a.s.l.). The first telescope will be settled within Autumn
2007. This paper shows the main characteristics of the experiment and its
expected performance.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 06:27:33 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Cusumano",
"G.",
"",
"IASF-Palermo"
],
[
"Agnetta",
"G.",
"",
"IASF-Palermo"
],
[
"Alberdi",
"A.",
"",
"IAA-Granada"
],
[
"Alvarez",
"M.",
"",
"DFAMN-US-Sevilla"
],
[
"Assis",
"P.",
"",
"LIP-Lisbon"
],
[
"Biondo",
"B.",
"",
"IASF-Palermo"
],
[
"Bocchino",
"F.",
"",
"OA-Palermo"
],
[
"Brogueira",
"P.",
"",
"LIP-Lisbon"
],
[
"Caballero",
"J. A.",
"",
"DFAMN-US-Sevilla"
],
[
"Carvajal",
"M.",
"",
"Univ. Huelva"
],
[
"Castro-Tirado",
"A. J.",
"",
"IAA-Granada"
],
[
"Catalano",
"O.",
"",
"IASF-Palermo"
],
[
"Celi",
"F.",
"",
"IASF-Palermo"
],
[
"Delgado",
"C.",
"",
"IAC-Tenerife"
],
[
"Di Cocco",
"G.",
"",
"IASF-Bologna"
],
[
"Dominguez",
"A.",
"",
"DFAMN-US-Sevilla"
],
[
"Navas",
"J. M. Espino",
"",
"DFAMN-US-Sevilla"
],
[
"Santo",
"M. C. Espirito",
"",
"LIP-Lisbon"
],
[
"Gallardo",
"M. I.",
"",
"DFAMN-US-Sevilla"
],
[
"Garcia",
"J. E.",
"",
"Univ. Huelva"
],
[
"Giarrusso",
"S.",
"",
"IASF-Palermo"
],
[
"Gomez",
"M.",
"",
"Univ. Huelva"
],
[
"Gomez",
"J. L.",
"",
"IAA-Granada"
],
[
"Goncalves",
"P.",
"",
"LIP-Lisbon"
],
[
"Guerriero",
"M.",
"",
"IAA-Granada"
],
[
"La Barbera",
"A.",
"",
"IASF-Palermo"
],
[
"La Rosa",
"G.",
"",
"IASF-Palermo"
],
[
"Lozano",
"M.",
"",
"DFAMN-US-Sevilla"
],
[
"Maccarone",
"M. C.",
"",
"IASF-Palermo"
],
[
"Mangano",
"A.",
"",
"IASF-Palermo"
],
[
"Martel",
"I.",
"",
"Univ. Huelva"
],
[
"Massaro",
"E.",
"",
"Univ. La Sapienza-Roma"
],
[
"Mineo",
"T.",
"",
"IASF-Palermo"
],
[
"Moles",
"M.",
"",
"IAA-Granada"
],
[
"Perez-Bernal",
"F.",
"",
"Univ. Huelva"
],
[
"Peres-Torres",
"M. A.",
"",
"IAA-Granada"
],
[
"Pimenta",
"M.",
"",
"LIP-Lisbon"
],
[
"Pina",
"A.",
"",
"LIP-Lisbon"
],
[
"Prada",
"F.",
"",
"IAA-Granada"
],
[
"Quesada",
"J. M.",
"",
"DFAMN-US-Sevilla"
],
[
"Quintana",
"J. M.",
"",
"IAA-Granada"
],
[
"Quintero",
"J. R.",
"",
"Univ. Huelva"
],
[
"Rodriguez",
"J.",
"",
"Univ. Huelva"
],
[
"Russo",
"F.",
"",
"IASF-Palermo"
],
[
"Sacco",
"B.",
"",
"IASF-Palermo"
],
[
"Sanchez-Conde",
"M. A.",
"",
"IAA-Granada"
],
[
"Segreto",
"A.",
"",
"IASF-Palermo"
],
[
"Tome'",
"B.",
"",
"LIP-Lisbon"
],
[
"Postigo",
"A. de Ugarte",
"",
"IAA-Granada"
],
[
"Vallania",
"P.",
"",
"IFSI-Torino"
]
] |
0707.4542 | Laurent Massouli\'{e} | Laurent Massouli\'e | Structural properties of proportional fairness: stability and
insensitivity | Published at http://dx.doi.org/10.1214/105051606000000907 in the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2007, Vol. 17, No. 3, 809-839 | 10.1214/105051606000000907 | IMS-AAP-AAP0220 | math.PR | null | In this article we provide a novel characterization of the proportionally
fair bandwidth allocation of network capacities, in terms of the
Fenchel--Legendre transform of the network capacity region. We use this
characterization to prove stability (i.e., ergodicity) of network dynamics
under proportionally fair sharing, by exhibiting a suitable Lyapunov function.
Our stability result extends previously known results to a more general model
including Markovian users routing. In particular, it implies that the stability
condition previously known under exponential service time distributions remains
valid under so-called phase-type service time distributions. We then exhibit a
modification of proportional fairness, which coincides with it in some
asymptotic sense, is reversible (and thus insensitive), and has explicit
stationary distribution. Finally we show that the stationary distributions
under modified proportional fairness and balanced fairness, a sharing criterion
proposed because of its insensitivity properties, admit the same large
deviations characteristics. These results show that proportional fairness is an
attractive bandwidth allocation criterion, combining the desirable properties
of ease of implementation with performance and insensitivity.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 06:30:27 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Massoulié",
"Laurent",
""
]
] |
0707.4543 | Seung Woo Ham | S.W. Ham, J.O. Im, and S.K. OH | Electroweak phase transition in the MNMSSM with explicit CP violation | 21 pages, 4 figures | null | null | null | hep-ph | null | In explicit CP violation scenario of the minimal non-minimal supersymmetric
standard model (MNMSSM), the possibility of a strongly first-order electroweak
phase transition (EWPT) is investigated at the one-loop level, where the
radiative corrections from the loops of the top and stop quarks are taken into
account. Assuming that the stop quark masses are not degenerate, the radiative
corrections due to the stop quarks give rise to a CP phase, which triggers the
scalar-pseudoscalar mixing in the Higgs sector of the MNMSSM. The lighter stop
quark need not always to have a small mass in order to ensure the strongly
first-order EWPT. In the MNMSSM with explicit CP violation, it is found that
the strength of the first-order EWPT depends on several factors, such as the
lightest neutral Higgs boson mass and the nontrivial CP phase arising from stop
quark masses. The effects of these factors are discussed.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 06:34:23 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Ham",
"S. W.",
""
],
[
"Im",
"J. O.",
""
],
[
"OH",
"S. K.",
""
]
] |
0707.4544 | Vikram Zaveri | Vikram H. Zaveri | Orbital period derivative of a binary system using an exact orbital
energy equation | 4 pages, v3: dynamic WEP | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proposed that the equations of motion in periodic relativity which
yielded major predictions of general relativity without utilizing Riemannian
geometry and geodesic trajectories are exact in nature and can be applied to
pulsars and inspiraling compact binaries for analyzing orbital period
derivative and two polarization gravitational wave forms. Exactness of these
equations eliminates the need for higher order xPN corrections to the orbital
energy part of the balance equation. This is mainly due to the introduction of
dynamic WEP which states that the gravitational mass is equal to the
relativistic mass.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 06:59:25 GMT"
},
{
"version": "v2",
"created": "Fri, 16 May 2008 05:38:33 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Nov 2014 06:15:23 GMT"
}
] | 2014-11-10T00:00:00 | [
[
"Zaveri",
"Vikram H.",
""
]
] |
0707.4545 | Tatsu Takeuchi | Minako Honda, Yee Kao, Naotoshi Okamura, Alexey Pronin, and Tatsu
Takeuchi | Constraints on New Physics from Long Baseline Neutrino Oscillation
Experiments | 47 pages RevTeX4, 8 eps figures, uses axodraw, updated bibliography | null | null | OCHA-PP-273, KEK-TH-1149, VPI-IPNAS-07-06 | hep-ph | null | New physics beyond the Standard Model can lead to extra matter effects on
neutrino oscillation if the new interactions distinguish among the three
flavors of neutrino. In a previous paper, we argued that a long-baseline
neutrino oscillation experiment in which the Fermilab-NUMI beam in its
high-energy mode is aimed at the planned Hyper-Kamiokande detector would be
capable of constraining the size of those extra effects, provided the vacuum
value of \sin^2 2\theta_{23} is not too close to one. In this paper, we discuss
how such a constraint would translate into limits on the coupling constants and
masses of new particles in various models. The models we consider are: models
with generation distinguishing Z's such as topcolor assisted technicolor,
models containing various types of leptoquarks, R-parity violating SUSY, and
extended Higgs sector models. In several cases, we find that the limits thus
obtained could be competitive with those expected from direct searches at the
LHC. In the event that any of the particles discussed here are discovered at
the LHC, then the observation, or non-observation, of their matter effects
could help in identifying what type of particle had been observed.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:02:51 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 03:08:54 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Honda",
"Minako",
""
],
[
"Kao",
"Yee",
""
],
[
"Okamura",
"Naotoshi",
""
],
[
"Pronin",
"Alexey",
""
],
[
"Takeuchi",
"Tatsu",
""
]
] |
0707.4546 | Nicolas Victoir | Laure Coutin, Peter Friz, Nicolas Victoir | Good rough path sequences and applications to anticipating stochastic
calculus | Published at http://dx.doi.org/10.1214/009117906000000827 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 3, 1172-1193 | 10.1214/009117906000000827 | IMS-AOP-AOP0210 | math.PR | null | We consider anticipative Stratonovich stochastic differential equations
driven by some stochastic process lifted to a rough path. Neither adaptedness
of initial point and vector fields nor commuting conditions between vector
field is assumed. Under a simple condition on the stochastic process, we show
that the unique solution of the above SDE understood in the rough path sense is
actually a Stratonovich solution. We then show that this condition is satisfied
by the Brownian motion. As application, we obtain rather flexible results such
as support theorems, large deviation principles and Wong--Zakai approximations
for SDEs driven by Brownian motion along anticipating vectorfields. In
particular, this unifies many results on anticipative SDEs.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:09:39 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Coutin",
"Laure",
""
],
[
"Friz",
"Peter",
""
],
[
"Victoir",
"Nicolas",
""
]
] |
0707.4547 | Srihari Keshavamurthy | Astha Sethi and Srihari Keshavamurthy | Bichromatically driven double well: Parametric perspective of the
control landscape | 4 pages, 4 figures; submitted | null | null | null | nlin.CD physics.chem-ph | null | We numerically construct and study the control landscape of a
$(\omega,2\omega)$ bichromatically driven double well in the presence of strong
fields. The control landscape is obtained by correlating the overlap
intensities between the floquet states and an initial phase space coherent
state with the parametric motion of the quasienergies {\it i.e.,}
intensity-level velocity correlator. "Walls" of no control, robust under
variations of the relative phase between the fields, are seen in the control
landscape and associated with multilevel interactions involving chaotic floquet
states.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:35:13 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Sethi",
"Astha",
""
],
[
"Keshavamurthy",
"Srihari",
""
]
] |
0707.4548 | Gyorgy Gyurky | Gy. Gyurky, D. Bemmerer, F. Confortola, H. Costantini, A. Formicola,
R. Bonetti, C. Broggini, P. Corvisiero, Z. Elekes, Zs. Fulop, G. Gervino, A.
Guglielmetti, C. Gustavino, G. Imbriani, M. Junker, M. Laubenstein, A. Lemut,
B. Limata, V. Lozza, M. Marta, R. Menegazzo, P. Prati, V. Roca, C. Rolfs, C.
Rossi Alvarez, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H.P.
Trautvetter | Comparison of the LUNA 3He(alpha,gamma)7Be activation results with
earlier measurements and model calculations | Accepted for publication in Journal of Physics G | J.Phys.G35:014002,2008 | 10.1088/0954-3899/35/1/014002 | null | nucl-ex | null | Recently, the LUNA collaboration has carried out a high precision measurement
on the 3He(alpha,gamma)7Be reaction cross section with both activation and
on-line gamma-detection methods at unprecedented low energies. In this paper
the results obtained with the activation method are summarized. The results are
compared with previous activation experiments and the zero energy extrapolated
astrophysical S factor is determined using different theoretical models.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:37:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gyurky",
"Gy.",
""
],
[
"Bemmerer",
"D.",
""
],
[
"Confortola",
"F.",
""
],
[
"Costantini",
"H.",
""
],
[
"Formicola",
"A.",
""
],
[
"Bonetti",
"R.",
""
],
[
"Broggini",
"C.",
""
],
[
"Corvisiero",
"P.",
""
],
[
"Elekes",
"Z.",
""
],
[
"Fulop",
"Zs.",
""
],
[
"Gervino",
"G.",
""
],
[
"Guglielmetti",
"A.",
""
],
[
"Gustavino",
"C.",
""
],
[
"Imbriani",
"G.",
""
],
[
"Junker",
"M.",
""
],
[
"Laubenstein",
"M.",
""
],
[
"Lemut",
"A.",
""
],
[
"Limata",
"B.",
""
],
[
"Lozza",
"V.",
""
],
[
"Marta",
"M.",
""
],
[
"Menegazzo",
"R.",
""
],
[
"Prati",
"P.",
""
],
[
"Roca",
"V.",
""
],
[
"Rolfs",
"C.",
""
],
[
"Alvarez",
"C. Rossi",
""
],
[
"Somorjai",
"E.",
""
],
[
"Straniero",
"O.",
""
],
[
"Strieder",
"F.",
""
],
[
"Terrasi",
"F.",
""
],
[
"Trautvetter",
"H. P.",
""
]
] |
0707.4549 | Miao Yu | Yu Miao | Central limit theorem and almost sure central limit theorem for the
product of some partial sums | 6 pages. To appear Proceedings of the Indian Academy of
Sciences-Mathematical Sciences | null | null | null | math.PR | null | In this paper, we give the central limit theorem and almost sure central
limit theorem for products of some partial sums of independent identically
distributed random variables.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:43:17 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Miao",
"Yu",
""
]
] |
0707.4550 | Angel Garcimartin | C. Mankoc, A. Janda, R. Ar\'evalo, J.M. Pastor, I. Zuriguel, A.
Garcimart\'in and D. Maza | The flow rate of granular materials through an orifice | submitted to Granular Matter | null | null | null | cond-mat.soft cond-mat.stat-mech | null | The flow rate of grains through large orifices is known to be dependent on
its diameter to a 5/2 power law. This relationship has been checked for big
outlet sizes, whereas an empirical fitting parameter is needed to reproduce the
behavior for small openings.
In this work, we provide experimental data and numerical simulations covering
a wide span of outlet sizes, both in three and two dimensions. This allows us
to show that the laws that are usually employed are satisfactory only if a
small range of openings is considered. We propose a new law for the mass flow
rate of grains that correctly reproduces the data for all the orifice sizes,
including the behaviors for very large and very small outlet sizes.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:50:12 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Mankoc",
"C.",
""
],
[
"Janda",
"A.",
""
],
[
"Arévalo",
"R.",
""
],
[
"Pastor",
"J. M.",
""
],
[
"Zuriguel",
"I.",
""
],
[
"Garcimartín",
"A.",
""
],
[
"Maza",
"D.",
""
]
] |
0707.4551 | Chitta Ranjan Das | Chitta Ranjan Das and Larisa V. Laperashvili | Preon Model and Family Replicated E_6 Unification | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 012, 15 pages | 10.3842/SIGMA.2008.012 | IMSc/2007/07/10 | hep-ph hep-th | null | Previously we suggested a new preon model of composite quark-leptons and
bosons with the 'flipped' $E_6\times \widetilde{E_6}$ gauge symmetry group. We
assumed that preons are dyons having both hyper-electric $g$ and hyper-magnetic
$\tilde g$ charges, and these preons-dyons are confined by hyper-magnetic
strings which are an ${\bf N}=1$ supersymmetric non-Abelian flux tubes created
by the condensation of spreons near the Planck scale. In the present paper we
show that the existence of the three types of strings with tensions $T_k=k T_0$
$(k = 1,2,3)$ producing three (and only three) generations of composite
quark-leptons, also provides three generations of composite gauge bosons
('hyper-gluons') and, as a consequence, predicts the family replicated
$[E_6]^3$ unification at the scale $\sim 10^{17}$ GeV. This group of
unification has the possibility of breaking to the group of symmetry: $
[SU(3)_C]^3\times [SU(2)_L]^3\times [U(1)_Y]^3 \times [U(1)_{(B-L)}]^3$ which
undergoes the breakdown to the Standard Model at lower energies. Some
predictive advantages of the family replicated gauge groups of symmetry are
briefly discussed.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:47:33 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Aug 2007 06:45:02 GMT"
},
{
"version": "v3",
"created": "Sat, 2 Feb 2008 11:40:16 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Das",
"Chitta Ranjan",
""
],
[
"Laperashvili",
"Larisa V.",
""
]
] |
0707.4552 | Farook Rahaman | F. Rahaman, M. Sarker and M. Kalam | Wormhole and C-field: Revisited | 10 pages and 5 figures, Submitted to Nuovo Cimento B after minor
revisions | Nuovo Cim.B122:389-396,2007 | 10.1393/ncb/i2007-10372-0 | null | gr-qc | null | Recently, Rahaman et al [ Nuovo.Cim 119B, 1115(2004)] have shown that the
static spherically symmetric solutions in presence of C-field give rise to
wormhole geometry. We highlight some of the characteristics of this wormhole,
which have not been considered in the previous study.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:47:40 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Rahaman",
"F.",
""
],
[
"Sarker",
"M.",
""
],
[
"Kalam",
"M.",
""
]
] |
0707.4553 | Feng Yu | Feng Yu | Stationary distributions of a model of sympatric speciation | Published at http://dx.doi.org/10.1214/105051606000000916 in the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2007, Vol. 17, No. 3, 840-874 | 10.1214/105051606000000916 | IMS-AAP-AAP0221 | math.PR | null | This paper deals with a model of sympatric speciation, that is, speciation in
the absence of geographical separation, originally proposed by U. Dieckmann and
M. Doebeli in 1999. We modify their original model to obtain a Fleming--Viot
type model and study its stationary distribution. We show that speciation may
occur, that is, the stationary distribution puts most of the mass on a
configuration that does not concentrate on the phenotype with maximum carrying
capacity, if competition between phenotypes is intense enough. Conversely, if
competition between phenotypes is not intense, then speciation will not occur
and most of the population will have the phenotype with the highest carrying
capacity. The length of time it takes speciation to occur also has a delicate
dependence on the mutation parameter, and the exact shape of the carrying
capacity function and the competition kernel.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:49:12 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Yu",
"Feng",
""
]
] |
0707.4554 | Kyosuke Hotta | Kyosuke Hotta and Takahiro Kubota | Exact Solutions and the Attractor Mechanism in Non-BPS Black Holes | 16 pages, added a few references | Prog.Theor.Phys.118:969-981,2007 | 10.1143/PTP.118.969 | OU-HET 583 | hep-th | null | The attractor mechanism for the four-dimensional ${\cal N}=2$ supergravity
black hole solution is analyzed in the case of the D0-D4 system. Our analyses
are based on newly derived exact solutions, which exhibit explicitly the
attractor mechanism for extremal non-BPS black holes. Our solutions account for
the moduli as general complex fields, while in almost all non-BPS solutions
obtained previously, the moduli fields are restricted to be purely imaginary.
It is also pointed out that our moduli solutions contain an extra parameter
that is not contained in solutions obtained by replacing the charges in the
double extremal moduli solutions by the corresponding harmonic functions.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:54:20 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 09:13:32 GMT"
},
{
"version": "v3",
"created": "Tue, 27 Nov 2007 07:47:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hotta",
"Kyosuke",
""
],
[
"Kubota",
"Takahiro",
""
]
] |
0707.4555 | Tadashi Shiota | T. Shiota, A. I. Mares, A. M. C. Valkering, T. H. Oosterkamp, J. M.
van Ruitenbeek | Mechanical properties of Pt monatomic chains | 6 pages, 5 figures | null | 10.1103/PhysRevB.77.125411 | null | cond-mat.mes-hall | null | The mechanical properties of platinum monatomic chains were investigated by
simultaneous measurement of an effective stiffness and the conductance using
our newly developed mechanically controllable break junction (MCBJ) technique
with a tuning fork as a force sensor. When stretching a monatomic contact
(two-atom chain), the stiffness and conductance increases at the early stage of
stretching and then decreases just before breaking, which is attributed to a
transition of the chain configuration and bond weakening. A statistical
analysis was made to investigate the mechanical properties of monatomic chains.
The average stiffness shows minima at the peak positions of the
length-histogram. From this result we conclude that the peaks in the
length-histogram are a measure of the number of atoms in the chains, and that
the chains break from a strained state. Additionally, we find that the smaller
the initial stiffness of the chain is, the longer the chain becomes. This shows
that softer chains can be stretched longer.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:56:38 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 12:04:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shiota",
"T.",
""
],
[
"Mares",
"A. I.",
""
],
[
"Valkering",
"A. M. C.",
""
],
[
"Oosterkamp",
"T. H.",
""
],
[
"van Ruitenbeek",
"J. M.",
""
]
] |
0707.4556 | Boyko Mihov | B. Mihov, R. Bachev, L. Slavcheva-Mihova, A. Strigachev, E. Semkov, G.
Petrov | Photometric monitoring of the blazar 3C 345 for the period 1996 - 2006 | null | null | 10.1002/asna.200710792 | null | astro-ph | null | We present the results of the blazar 3C 345 monitoring in Johnson-Cousins
BVRI bands for the period 1996 - 2006. We have collected 29 V and 43 R data
points for this period; the BI light curves contain a few measurements only.
The accuracy of our photometry is not better than 0.03 mag in the VR bands. The
total amplitude of the variability obtained from our data is 2.06 mag in the V
band and 2.25 mag in the R one. 3C 345 showed periods of flaring activity
during 1998/99 and 2001: a maximum of the blazar brightness was detected in
2001 February - 15.345 mag in the V band and 14.944 mag in the R one. We
confirm that during brighter stages 3C 345 becomes redder; for higher fluxes
the colour index seems to be less dependent on the magnitude. The intra-night
monitoring of 3C 345 in three consecutive nights in 2001 August revealed no
significant intra-night variability; 3C 345 did not show evident flux changes
over timescales of weeks around the period of the intra-night monitoring. This
result supports the existing facts that intra-night variability is correlated
with rapid flux changes rather than with specific flux levels.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 07:58:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mihov",
"B.",
""
],
[
"Bachev",
"R.",
""
],
[
"Slavcheva-Mihova",
"L.",
""
],
[
"Strigachev",
"A.",
""
],
[
"Semkov",
"E.",
""
],
[
"Petrov",
"G.",
""
]
] |
0707.4557 | Khamidbi Beshtoev Mukhamedovich | Kh. M. Beshtoev | Majorana neutrino. Is double neutrinoless beta decay possible in the
framework of the weak interactions? How to prove that neutrino is Majorana
particle | 12 pages, no figures | null | null | null | hep-ph | null | Usually it is supposed that Majorana neutrino produced in the superposition
state $\chi_L = \nu_L + (\nu_L)^c$ and then follows the neutrinoless double
beta decay. But since weak interactions are chiral invariant then the neutrino
at production has definite helicity (i.e., $\nu_L$ and $(\nu_L)^c$ neutrinos
are separately produced and then neutrino is not in the superposition state).
This helicity cannot change after production without any external interactions.
Thus we see that for unsuitable helicity the neutrinoless double $\beta$ decay
is not possible even if neutrino is a Majorana particle. Also transition of
Majorana neutrino into antineutrino at their oscillations is forbidden since
helicity in vacuum holds. Then only possibility to prove that neutrino is a
Dirac but not Majorana particle is detection transition of $\nu_L$ neutrino
into (sterile) antineutrino $\bar\nu_R$ (i.e., $\nu_L \to \bar\nu_R$) at
neutrino oscillations. Transition Majora neutrino $\nu_L$ into $(\nu_R)^c$
(i.e., $\nu_L \to (\nu_R)^c$) at oscillations is unobserved since it is
supposed that mass of $(\nu_R)^c$ is very big.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 08:18:21 GMT"
}
] | 2009-01-01T00:00:00 | [
[
"Beshtoev",
"Kh. M.",
""
]
] |
0707.4558 | Bernd Sturmfels | Bernd Sturmfels | Open Problems in Algebraic Statistics | 13 pages | null | null | null | math.ST math.AG stat.CO stat.TH | null | Algebraic statistics is concerned with the study of probabilistic models and
techniques for statistical inference using methods from algebra and geometry.
This article presents a list of open mathematical problems in this emerging
field, with main emphasis on graphical models with hidden variables, maximum
likelihood estimation, and multivariate Gaussian distributions. This article is
based on a lecture presented at the IMA in Minneapolis during the 2006/07
program on Applications of Algebraic Geometry.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 08:32:28 GMT"
},
{
"version": "v2",
"created": "Sat, 10 Nov 2007 08:55:56 GMT"
}
] | 2007-11-10T00:00:00 | [
[
"Sturmfels",
"Bernd",
""
]
] |
0707.4559 | Takayuki Miyadera | Takayuki Miyadera, Hideki Imai | Information-Disturbance theorem and Uncertainty Relation | null | null | null | null | quant-ph | null | It has been shown that Information-Disturbance theorem can play an important
role in security proof of quantum cryptography. The theorem is by itself
interesting since it can be regarded as an information theoretic version of
uncertainty principle. It, however, has been able to treat restricted
situations. In this paper, the restriction on the source is abandoned, and a
general information-disturbance theorem is obtained. The theorem relates
information gain by Eve with information gain by Bob.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 08:42:07 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Miyadera",
"Takayuki",
""
],
[
"Imai",
"Hideki",
""
]
] |
0707.4560 | Eliecer Hernandez-Gajate | C. Albertus, E. Hern\'andez, J. Nieves, J. M. Verde-Velasco | Masses and semileptonic decays of doubly heavy baryons in a
nonrelativistic quark model | 3 latex pages, two tables. To appear in the INPC07 proceedings | null | 10.1140/epja/i2008-10547-0 | null | nucl-th | null | We evaluate masses and semileptonic decay widths for the ground state of
doubly heavy $\Xi$ and $\Omega$ baryons in the framework of a nonrelativistic
quark model. We solve the three-body problem by means of a variational ansatz
made possible by heavy-quark spin symmetry constraints. Our masses are
comparable to the ones obtained in relativistic calculations and we get one of
the best agreements with lattice data. Our simple wave functions are used to
evaluate semileptonic decays of doubly heavy $\Xi, \Xi'(J=1/2)$ and $\Omega,
\Omega'(J=1/2)$ baryons. Our results for the decay widths are in reasonable
agreement with calculations done in a relativistic calculation in the
quark-diquark approximation. We also check that our wave functions comply with
what it is expected in the infinite heavy quark mass limit.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 08:51:22 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Albertus",
"C.",
""
],
[
"Hernández",
"E.",
""
],
[
"Nieves",
"J.",
""
],
[
"Verde-Velasco",
"J. M.",
""
]
] |
0707.4561 | William T. Ford | The BABAR Collaboration: B. Aubert, et al | Observation of B-meson decays to b_1 pi and b_1 K | 7 pages, 1 postscript figure, as published in Physical Review Letters | Phys.Rev.Lett.99:241803,2007 | 10.1103/PhysRevLett.99.241803 | BABAR-PUB-07/037, SLAC-PUB-12700 | hep-ex | null | We present the results of searches for decays of B mesons to final states
with a b_1 meson and a charged pion or kaon. The data, collected with the BaBar
detector at the Stanford Linear Accelerator Center, represent 382 million
B-Bbar pairs produced in e+e- annihilation. The results for the branching
fractions are, in units of 10^{-6}, B(B+ -> b1^0 pi+) = 6.7 +/- 1.7 +/- 1.0
(4.0 sigma), B(B+ -> b1^0 K+ = 9.1+/- 1.7+/- 1.0 (5.3 sigma), B(B0 -> b1^-/+
pi^+/-) = 10.9 +/- 1.2 +/- 0.9 (8.9 sigma), and B(B0 -> b1^-K+) = 7.4 +/- 1.0
+/- 1.0 (6.1 sigma), with the assumption that B(b_1 -> omega pi)=1. We also
measure charge and flavor asymmetries Ach(B+ -> b1^0 pi+) = 0.05 +/- 0.16 +/-
0.02, Ach(B+ -> b1^0 K+ = -0.46 +/- 0.20 +/- 0.02, Ach(B0 -> b1^-/+ pi^+/-) =
-0.05 +/- 0.10 +/- 0.02, C(B0 -> b1^-/+ pi^+/-) = -0.22 +/- 0.23 +/- 0.05,
deltaC(B0 -> b1^-/+ pi^+/-) = -1.04 +/- 0.23 +/- 0.08, and Ach(B0 -> b1^-K+) =
-0.07 +/- 0.12 +/- 0.02, The first error quoted is statistical, the second
systematic, and for the branching fractions, the significance is given in
parentheses.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 19:58:50 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 22:41:50 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0707.4562 | Jean Nuyts | Fernand Grard, Jean Nuyts | Warped Kaluza-Klein Towers Revisited | 34 pages, 5 figures | Phys.Rev.D76:124022,2007 | 10.1103/PhysRevD.76.124022 | null | hep-th | null | Inspired by the warped Randall Sundrum scenario proposed to solve the mass
scale hierarchy problem with a compactified fifth extra dimension, a similar
model with no metric singularities has been elaborated. In this framework, the
Kaluza-Klein reduction equations for a real massless scalar field propagating
in the bulk have been studied carefully from the point of view of hermiticity
so as to formulate in a mathematically rigorous way all the possible boundary
conditions and corresponding mass eigenvalue towers and tachyon states. The
physical masses as observable in our four-dimensional brane are deduced from
these mass eigenvalues depending on the location of the brane on the extra
dimension axis. Examples of mass towers and tachyons and related field
probability densities are presented from numerical computations performed for
some arbitrary choices of the parameters of the model.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:08:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grard",
"Fernand",
""
],
[
"Nuyts",
"Jean",
""
]
] |
0707.4563 | Kenji Bekki dr | Kenji Bekki | Origin of lower velocity dispersions of ultra-compact dwarf galaxy
populations in clusters of galaxies | 6 pages, 5 figures, MNRAS in press | null | 10.1111/j.1365-2966.2007.12163.x | null | astro-ph | null | Recent observations have revealed that velocity dispersions of
``ultra-compact dwarf'' (UCD) galaxies are significantly smaller than those of
other galaxy populations in the Fornax and the Virgo clusters of galaxies. In
order to understand the origin of the observed lower velocity dispersions of
UCDs, we numerically investigate line-of-sight velocity dispersion (sigma_los)
of galaxy populations with variously different orbits in clusters of galaxies
with the total masses of M_cl. We particularly investigate radial velocity
dispersion profiles (sigma_los(R)) and velocity dispersions within the central
200 kpc of a cluster model (sigma_m) for galaxies with different pericenter
distances (r_p) and orbital eccentricities (e) in the model with M_cl = 7.0 x
10^13 M_sun reasonable for the Fornax cluster. We find that sigma_los(R) and
sigma_m of galaxies with smaller r_p are steeper and smaller, respectively, for
a given initial e distribution of galaxies. For example, we find that sigma_m
is ~ 260 km/s for galaxies with r_p <50 kpc and ~ 336 km/s for all galaxies in
the model with the mean e of 0.6. These results imply that the observed lower
velocity dispersion of UCD population is consistent with the UCDs having
significantly smaller r_p than other galaxy populations in the Fornax. We
discuss these results in the context of the ``galaxy threshing'' scenario in
which UCDs originate from nuclei of nucleated dwarf galaxies. We suggest that
the observed differences in kinematical properties between UCDs and other dwarf
galaxy populations in clusters of galaxies can be understood in terms of the
differences in orbital properties between UCDs and the dwarf populations.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:13:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bekki",
"Kenji",
""
]
] |
0707.4564 | Sophie Henrot-Versille | S. Henrot-Versille, R. Cizeron, F. Couchot | Characterisation of pulsed Carbon fiber illuminators for FIR instrument
calibration | null | null | null | null | astro-ph | null | We manufactured pulsed illuminators emitting in the far infrared for the
Planck-HFI bolometric instrument ground calibrations. Specific measurements
have been conducted on these light sources, based on Carbon fibers, to
understand and predict their properties. We present a modelisation of the
temperature dependence of the thermal conductivity and the calorific
capacitance of the fibers. A comparison between simulations and bolometer data
is given, that shows the coherence of our model. Their small time constants,
their stability and their emission spectrum pointing in the submm range make
these illuminators a very usefull tool for calibrating FIR instruments.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:19:10 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Henrot-Versille",
"S.",
""
],
[
"Cizeron",
"R.",
""
],
[
"Couchot",
"F.",
""
]
] |
0707.4565 | Christian Hoffmann | Markus Bl\"aser, Christian Hoffmann | On the Complexity of the Interlace Polynomial | 18 pages, 1 figure; new graph transformation (adding cycles) solves
some unknown points, error in the statement of the inapproximability result
fixed; a previous version has appeared in the proceedings of STACS 2008 | null | null | null | cs.CC math.CO | null | We consider the two-variable interlace polynomial introduced by Arratia,
Bollobas and Sorkin (2004). We develop graph transformations which allow us to
derive point-to-point reductions for the interlace polynomial. Exploiting these
reductions we obtain new results concerning the computational complexity of
evaluating the interlace polynomial at a fixed point. Regarding exact
evaluation, we prove that the interlace polynomial is #P-hard to evaluate at
every point of the plane, except on one line, where it is trivially polynomial
time computable, and four lines, where the complexity is still open. This
solves a problem posed by Arratia, Bollobas and Sorkin (2004). In particular,
three specializations of the two-variable interlace polynomial, the
vertex-nullity interlace polynomial, the vertex-rank interlace polynomial and
the independent set polynomial, are almost everywhere #P-hard to evaluate, too.
For the independent set polynomial, our reductions allow us to prove that it is
even hard to approximate at any point except at 0.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:23:13 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Dec 2007 09:34:17 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Apr 2008 13:51:09 GMT"
}
] | 2008-04-16T00:00:00 | [
[
"Bläser",
"Markus",
""
],
[
"Hoffmann",
"Christian",
""
]
] |
0707.4566 | Kenji Bekki dr | Kenji Bekki | Evolution of the Small Magellanic Cloud | 4 pages, 3 figures, to appear in the proceedings of ``Galaxies in the
Local Volume'', Sydney, 8 to 13 July, 2007 | null | 10.1007/978-1-4020-6933-8_55 | null | astro-ph | null | Based on the results of N-body simulations on the last 2.5 Gyr evolution of
the Large and Small Magellanic Clouds (LMC and SMC, respectively) interacting
with the Galaxy, we firstly show when and where the leading arms (LAs) of the
Magellanic stream (MS) can pass through the Galactic plane after the MS
formation. We secondly show collisions between the outer Galactic HI disk and
the LAs of the MS can create giant HI holes and chimney-like structures in the
disk about 0.2 Gyr ago. We thirdly show that a large amount of metal-poor gas
is stripped from the SMC and transfered to the LMC during the tidal interaction
between the Clouds and the Galaxy about 0.2 and 1.3 Gyr ago. We thus propose
that this metal-poor gas can closely be associated with the origin of LMC's
young and intermediate-age stars and star clusters with distinctively
low-metallicities with [Fe/H] < -0.6.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:35:56 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Bekki",
"Kenji",
""
]
] |
0707.4567 | Benjamin Nill | Dimitrios I. Dais, Benjamin Nill | A boundedness result for toric log Del Pezzo surfaces | 10 pages; final version (typos corrected, references updated) | Archiv Math. 91 (2008), 526-535 | null | null | math.AG math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we give an upper bound for the Picard number of the rational
surfaces which resolve minimally the singularities of toric log Del Pezzo
surfaces of given index $\ell$. This upper bound turns out to be a quadratic
polynomial in the variable $\ell$.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 16:46:29 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Sep 2008 12:29:15 GMT"
}
] | 2010-02-14T00:00:00 | [
[
"Dais",
"Dimitrios I.",
""
],
[
"Nill",
"Benjamin",
""
]
] |
0707.4568 | Gerard Hooft 't | Gerard 't Hooft | Emergent Quantum Mechanics and Emergent Symmetries | 10 pages, 1 figure. Presented at PASCOS 13, Imperial College, London,
July 6, 2007 | AIPConf.Proc.957:154-163,2007 | 10.1063/1.2823751 | ITP-UU-07/39, SPIN-07/27 | hep-th | null | Quantum mechanics is 'emergent' if a statistical treatment of large scale
phenomena in a locally deterministic theory requires the use of quantum
operators. These quantum operators may allow for symmetry transformations that
are not present in the underlying deterministic system. Such theories allow for
a natural explanation of the existence of gauge equivalence classes (gauge
orbits), including the equivalence classes generated by general coordinate
transformations. Thus, local gauge symmetries and general coordinate invariance
could be emergent symmetries, and this might lead to new alleys towards
understanding the flatness problem of the Universe.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:22:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hooft",
"Gerard 't",
""
]
] |
0707.4569 | Fabrice Mortessagne | Claire Michel (LPMC), Val\'erie Doya (LPMC), Olivier Legrand (LPMC),
Fabrice Mortessagne (LPMC) | Selective amplification of scars in a chaotic optical fiber | null | Physical Review Letters 99 (2007) 224101 | 10.1103/PhysRevLett.99.224101 | null | nlin.CD nlin.PS physics.optics | null | In this letter we propose an original mechanism to select scar modes through
coherent gain amplification in a multimode D-shaped fiber. More precisely, we
numerically demonstrate how scar modes can be amplified by positioning a gain
region in the vicinity of specific points of a short periodic orbit known to
give rise to scar modes.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:42:16 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 07:08:56 GMT"
}
] | 2007-12-03T00:00:00 | [
[
"Michel",
"Claire",
"",
"LPMC"
],
[
"Doya",
"Valérie",
"",
"LPMC"
],
[
"Legrand",
"Olivier",
"",
"LPMC"
],
[
"Mortessagne",
"Fabrice",
"",
"LPMC"
]
] |
0707.4570 | Alexander Stoyanovsky | A. V. Stoyanovsky | A necessary condition for existence of S-matrix outside perturbation
theory | 6 pages, revised version | Math. Notes, 83, No.4, 613--617(2008). | null | null | hep-th math-ph math.MP | null | Using the Maslov--Shvedov method of complex germ, we show that quantum field
theory S-matrix can exist outside perturbation theory in the principal order of
quasiclassical approximation only under the condition that the tangent
symplectic transformation to the evolution operator of non-linear classical
field equation is unitarily implementable in the Fock space. However, the
results of Maslov--Shvedov's book imply that this condition is seemingly always
satisfied.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:45:40 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 14:14:16 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Aug 2007 08:21:30 GMT"
}
] | 2009-10-14T00:00:00 | [
[
"Stoyanovsky",
"A. V.",
""
]
] |
0707.4571 | Mikhail V. Fistul | M. V. Fistul and K. B. Efetov | Photon-assisted spin transport in a two-dimensional electron gas | extended version accepted in the Physical Review B, corrected typos,
5 pages, 3 new figures | null | 10.1103/PhysRevB.76.195329 | null | cond-mat.mes-hall | null | We study spin-dependent transport in a two-dimensional electron gas subject
to an external step-like potential $V(x)$ and irradiated by an electromagnetic
field (EF). In the absence of EF the electronic spectrum splits into spin
sub-bands originating from the "Rashba" spin-orbit coupling. We show that the
resonant interaction of propagating electrons with the component EF parallel to
the barrier induces a \textit{% non-equilibrium dynamic gap} $(2\Delta_{R})$
between the spin sub-bands. Existence of this gap results in coherent spin-flip
processes that lead to a spin-polarized current and a large magnetoresistance,
i.e the spin valve effect. These effects may be used for controlling spin
transport in semiconducting nanostructures, e.g. spin transistors,
spin-blockade devices etc., by variation of the intensity S and frequency
$\omega $ of the external radiation.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:47:26 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Nov 2007 15:07:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fistul",
"M. V.",
""
],
[
"Efetov",
"K. B.",
""
]
] |
0707.4572 | Gerard Hooft 't | Gerard 't Hooft | The Grand View of Physics | 5 pages, 1 figure. Presented at Salam +50, Imperial College, London,
July 7, 2007 | Int.J.Mod.Phys.A23:3755-3759,2008 | 10.1142/S0217751X08042390 | ITP-UU-07/38, SPIN-07/26 | hep-th | null | Abdus Salam was known for his `grand views', grand views of science as well
as grand views of society. In this talk the grand view of theoretical physics
is put in perspective.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:50:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hooft",
"Gerard 't",
""
]
] |
0707.4573 | Eran Bouchbinder | Eran Bouchbinder and Ting-Shek Lo | Fronts Propagation at the Onset of Plastic Yielding | 6 pages, 1 figure; reorganized paper, friction part omitted | Phys. Rev. E 78, 026119 (2008) | 10.1103/PhysRevE.78.026119 | null | cond-mat.mtrl-sci cond-mat.stat-mech | null | The existence of a finite threshold, the yield stress, for the onset of
plastic yielding is a universal feature of plasticity. This jamming-unjamming
transition is naturally accounted for by the dynamics of a bistable internal
state field. We show, within the athermal Shear Transformation Zones (STZ)
theory of amorphous plasticity, that the transition is accompanied by the
propagation of plastic fronts. We further show that the mean-field theory
cannot select the velocity of these fronts and go beyond the mean-field
description to include fluctuations and correlations effects, resulting in new
nonlocal terms in the equations. Finally, we demonstrate that the new terms,
with an associated intrinsic lengthscale, provide a velocity selection
mechanism for the plastic fronts.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 09:56:06 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 15:26:28 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Mar 2008 12:46:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bouchbinder",
"Eran",
""
],
[
"Lo",
"Ting-Shek",
""
]
] |
0707.4574 | Min-Fong Yang | Min-Fong Yang | Ground-state fidelity in one-dimensional gapless model | 4+ pages, no figure, published version | Phys. Rev. B 76, 180403(R) (2007) | 10.1103/PhysRevB.76.180403 | null | quant-ph cond-mat.stat-mech | null | A general relation between quantum phase transitions and the second
derivative of the fidelity (or the "fidelity susceptibility") is proposed. The
validity and the limitation of the fidelity susceptibility in characterizing
quantum phase transitions is thus established. Moreover, based on the
bosonization method, general formulas of the fidelity and the fidelity
susceptibility are obtained for a class of one-dimensional gapless systems
known as the Tomonaga-Luttinger liquid. Applying these formulas to the
one-dimensional spin-1/2 $XXZ$ model, we find that quantum phase transitions,
even of the Beresinskii-Kosterlitz-Thouless type, can be signaled by the
fidelity susceptibility.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:10:48 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 00:25:21 GMT"
}
] | 2007-11-09T00:00:00 | [
[
"Yang",
"Min-Fong",
""
]
] |
0707.4575 | Pedro de Andres L | P.L. de Andres, R. Ramirez, J.A. Verges | Strong covalent bonding between two graphene layers | tar gzip latex 4 pages 4 figures | Phys. Rev. B 77, 045403 (2008) | 10.1103/PhysRevB.77.045403 | null | cond-mat.mtrl-sci | null | We show that two graphene layers stacked directly on top of each other (AA
stacking) form strong chemical bonds when the distance between planes is 0.156
nm. Simultaneously, C-C in-plane bonds are considerably weakened from partial
double-bond (0.141 nm) to single bond (0.154 nm). This polymorphic form of
graphene bilayer is meta-stable w.r.t. the one bound by van der Waals forces at
a larger separation (0.335 nm) with an activation energy of 0.16 eV/cell.
Similarly to the structure found in hexaprismane, C forms four single bonds in
a geometry mixing 90^{0} and 120^{0} angles. Intermediate separations between
layers can be stabilized under external anisotropic stresses showing a rich
electronic structure changing from semimetal at van der Waals distance, to
metal when compressed, to wide gap semiconductor at the meta-stable minimum.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:00:51 GMT"
}
] | 2008-02-27T00:00:00 | [
[
"de Andres",
"P. L.",
""
],
[
"Ramirez",
"R.",
""
],
[
"Verges",
"J. A.",
""
]
] |
0707.4576 | Martin Paulat | Martin Paulat | Heat kernel estimates for the Grusin operator | 32 pages, 8 figures | null | null | null | math.AP math.DG | null | We study the geometry associated to the Grusin operator
G=\Delta_{x}+|x|^{2}\partial_{u}^{2} on \mathbb{R}_{x}^{n}\times\mathbb{R}_{u},
to obtain heat kernel estimates for this operator. The main work is to find the
shortest geodesics connecting two given points in $\mathbb{R}^{n+1}$. This
gives the Carnot-Caratheodory distance d_{CC}, associated to this operator. The
main result in the second part is to give Gaussian bounds for the heat kernel
K_{t} in terms of the Carnot-Caratheodory distance. In particular we obtain the
following estimate
|k_{t}(\zeta,\eta)|\leq C t^{-\frac{n}{2}-1}\min(1+\frac{d_{CC}(\zeta,\eta)}
{|x+\xi|},1+\frac{d_{CC}(\zeta,\eta)^{2}}{4t})^{\alpha}e^{-\frac{1}{4t}d_{CC}
(\zeta,\eta)^{2}}
for all $\zeta=(x,u_{1}), \eta=(\xi,u)\in\mathbb{R}^{n+1}$, where $\alpha =
\max{\frac{n}{2}-1,0}$. Here the homogeneous dimension is q=n+2, so that
$\frac{n}{2}-1=\frac{q-4}{2}$. This shows that our result for $n\geq2$
corresponds with the result on the Heisenberg group, which was given by Beals,
Gaveau, Greiner in [1].
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:03:07 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Paulat",
"Martin",
""
]
] |
0707.4577 | Michael Schreiber | Michael Schreiber | The influence of self-citation corrections on Egghe's g index | 9 pages, 2 figures, submitted to Scientometrics | Scientometrics 76, 187-200 (2008) | 10.1007/s11192-007-1886-6 | null | physics.soc-ph | null | The g index was introduced by Leo Egghe as an improvement of Hirsch's index h
for measuring the overall citation record of a set of articles. It better takes
into account the highly skewed frequency distribution of citations than the h
index. I propose to sharpen this g index by excluding the self-citations. I
have worked out nine practical cases in physics and compare the h and g values
with and without self-citations. As expected, the g index characterizes the
data set better than the h index. The influence of the self-citations appears
to be more significant for the g index than for the h index.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:07:37 GMT"
}
] | 2013-01-31T00:00:00 | [
[
"Schreiber",
"Michael",
""
]
] |
0707.4578 | A. D. Polosa | L. Maiani, A.D. Polosa, V. Riquer, C.A. Salgado | Update on Counting Valence Quarks at RHIC | 4 pages, 4 figures | null | null | null | hep-ph | null | We update our former analysis of the Nuclear Modification Factors (NMF) for
different hadron species at RHIC and LHC. This update is motivated by the new
experimental data from STAR which presents differences with the preliminary
data used to fix some of the parameters in our model. The main change is the
use of AKK fragmentation functions for the hard part of the spectrum and minor
adjustments of the coalescence (soft) contribution. We confirm that observation
of the NMF for the f_0 meson can shed light on its quark composition.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:04:33 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Maiani",
"L.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
],
[
"Salgado",
"C. A.",
""
]
] |
0707.4579 | P\'eter Veres | P\'eter Veres and Denise C. Gabuzda | Magnetic Field Structures of BL Lac Objects on Decaparsec Scales | 4 pages, 2 figures, to appear in "Extragalactic Jets: Theory and
Observation from Radio to Gamma Ray", eds. A. Rector and D. S. De Young, ASP
conference series | null | null | null | astro-ph | null | Relatively few Very Long Baseline Interferometry (VLBI) polarization
observations have been carried out at 18 cm. The importance of such
observations lies in their ability to reveal information about the jet magnetic
({\bf B}) field structure and the environment of the jet on scales intermediate
between those probed by higher-frequency VLBI and connected-element
interferometers such as the Very Large Array. We have obtained polarization
observations of 34 BL Lac objects with the Very Long Baseline Array (VLBA), at
4 separate wavelengths in the 18-20 cm band. The 18-cm jets typically extend to
tens of parsecs. In some cases, the decaparsec jet is a continuation of the jet
on smaller scales, while in others, we see appreciable bending. We have
constructed Faraday rotation-measure maps and used them to study the jet {\bf
B} field structures and distribution of thermal plasma around the jets. The
Faraday rotation is typically large at these wavelengths, and knowledge of the
rotation-measure distribution is essential to derive the {\bf B} field
structures of the jets. The high sensitivity of these observations to Faraday
rotation makes them an effective tool for studies of possible interactions
between the jets and the media through which they propagate.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:29:39 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Veres",
"Péter",
""
],
[
"Gabuzda",
"Denise C.",
""
]
] |
0707.4580 | Gregory Gutin | Gregory Gutin | Note on edge-colored graphs and digraphs without properly colored cycles | null | null | null | null | cs.DM | null | We study the following two functions: d(n,c) and $\vec{d}(n,c)$; d(n,c)
($\vec{d}(n,c)$) is the minimum number k such that every c-edge-colored
undirected (directed) graph of order n and minimum monochromatic degree
(out-degree) at least k has a properly colored cycle. Abouelaoualim et al.
(2007) stated a conjecture which implies that d(n,c)=1. Using a recursive
construction of c-edge-colored graphs with minimum monochromatic degree p and
without properly colored cycles, we show that $d(n,c)\ge {1 \over c}(\log_cn
-\log_c\log_cn)$ and, thus, the conjecture does not hold. In particular, this
inequality significantly improves a lower bound on $\vec{d}(n,2)$ obtained by
Gutin, Sudakov and Yeo in 1998.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 17:36:54 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Gutin",
"Gregory",
""
]
] |
0707.4581 | Piotr Gnaci\'nski | P. Gnacinski, M. Krogulec | Physical conditions in CaFe interstellar clouds | Changed content, figure added | Astron.Astrophys.477:543,2008 | 10.1051/0004-6361:20078602 | null | astro-ph | null | Interstellar clouds that exhibit strong Ca I and Fe I lines were called CaFe
clouds. The ionisation equilibrium equations were used to model the column
densities of Ca II, Ca I, K I, Na I, Fe I and Ti II in CaFe clouds. The
chemical composition of CaFe clouds is that of the Solar System and no
depletion of elements onto dust grains is seen. The CaFe clouds have high
electron densities n=1 cm^-3 that leads to high column densities of neutral Ca
and Fe.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:05:11 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 10:55:56 GMT"
}
] | 2010-04-28T00:00:00 | [
[
"Gnacinski",
"P.",
""
],
[
"Krogulec",
"M.",
""
]
] |
0707.4582 | Maxim Kharitonov | Maxim Yu. Kharitonov and Konstantin B. Efetov | Hall Effect in Granular Metals: Weak Localization Corrections | 8 pages, 4 figures | null | null | null | cond-mat.mes-hall cond-mat.str-el | null | We study the effects of localization on the Hall transport in a granular
system at large tunneling conductance $g_{T}\gg 1$ corresponding to the
metallic regime. We show that the first-order in 1/g_T weak localization
correction to Hall resistivity of a two- or three-dimensional granular array
vanishes identically, $\de \rho_{xy}^{WL}=0$. This result is in agreement with
the one for ordinary disordered metals. Being due to an exact cancellation, our
result holds for arbitrary relevant values of temperature T and magnetic field
H, both in the ``homogeneous'' regime of very low T and H corresponding to
ordinary disordered metals and in the ``structure-dependent'' regime of higher
values of T or H.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:56:25 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Kharitonov",
"Maxim Yu.",
""
],
[
"Efetov",
"Konstantin B.",
""
]
] |
0707.4583 | Stephen C. Davis | Philippe Brax, Anne-Christine Davis, Stephen C. Davis, Rachel
Jeannerot, Marieke Postma | Warping and F-term uplifting | 24 pages, v3: typos, minor clarifications added | JHEP 0709:125,2007 | 10.1088/1126-6708/2007/09/125 | null | hep-th | null | We analyse the effective supergravity model of a warped compactification with
matter on D3 and D7-branes. We find that the main effect of the warp factor is
to modify the F-terms while leaving the D-terms invariant. Hence warped models
with moduli stabilisation and a small positive cosmological constant resulting
from a large warping can only be achieved with an almost vanishing D-term and a
F-term uplifting. By studying string-motivated examples with gaugino
condensation on magnetised D7-branes, we find that even with a vanishing
D-term, it is difficult to achieve a Minkowski minimum for reasonable parameter
choices. When coupled to an ISS sector the AdS vacua is uplifted, resulting in
a small gravitino mass for a warp factor of order 10^-5.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 10:47:57 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 13:30:40 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Sep 2007 12:34:37 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Brax",
"Philippe",
""
],
[
"Davis",
"Anne-Christine",
""
],
[
"Davis",
"Stephen C.",
""
],
[
"Jeannerot",
"Rachel",
""
],
[
"Postma",
"Marieke",
""
]
] |
0707.4584 | Elena Cordero | Elena Cordero and Fabio Nicola | Some new Strichartz estimates for the Schr\"odinger equation | 30 pages | J. Differential Equations, 245(7):1945--1974, 2008 | null | null | math.AP math-ph math.MP | null | We deal with fixed-time and Strichartz estimates for the Schr\"odinger
propagator as an operator on Wiener amalgam spaces. We discuss the sharpness of
the known estimates and we provide some new estimates which generalize the
classical ones. As an application, we present a result on the wellposedness of
the linear Schr\"odinger equation with a rough time dependent potential.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:08:44 GMT"
}
] | 2016-06-28T00:00:00 | [
[
"Cordero",
"Elena",
""
],
[
"Nicola",
"Fabio",
""
]
] |
0707.4585 | Vladimir Kravtsov | E. Cuevas and V. E. Kravtsov | Two-eigenfunction correlation in a multifractal metal and insulator | 16 pages, 18 figures | Phys.Rev.B, vol.76, 235119 (2007) | 10.1103/PhysRevB.76.235119 | null | cond-mat.mes-hall cond-mat.stat-mech | null | We consider the correlation of two single-particle probability densities
$|\Psi_{E}({\bf r})|^{2}$ at coinciding points ${\bf r}$ as a function of the
energy separation $\omega=|E-E'|$ for disordered tight-binding lattice models
(the Anderson models) and certain random matrix ensembles. We focus on the
models in the parameter range where they are close but not exactly at the
Anderson localization transition. We show that even far away from the critical
point the eigenfunction correlation show the remnant of multifractality which
is characteristic of the critical states. By a combination of the numerical
results on the Anderson model and analytical and numerical results for the
relevant random matrix theories we were able to identify the Gaussian random
matrix ensembles that describe the multifractal features in the metal and
insulator phases. In particular those random matrix ensembles describe new
phenomena of eigenfunction correlation we discovered from simulations on the
Anderson model. These are the eigenfunction mutual avoiding at large energy
separations and the logarithmic enhancement of eigenfunction correlations at
small energy separations in the two-dimensional (2D) and the three-dimensional
(3D) Anderson insulator. For both phenomena a simple and general physical
picture is suggested.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:19:41 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 16:32:20 GMT"
}
] | 2010-10-29T00:00:00 | [
[
"Cuevas",
"E.",
""
],
[
"Kravtsov",
"V. E.",
""
]
] |
0707.4586 | Hua-Xing Chen | Hua-Xing Chen, Atsushi Hosaka, and Shi-Lin Zhu | Light Scalar Tetraquark Mesons in the QCD Sum Rule | 18 pages, 5 figures; reference added, minor corrections; version to
appear in Phys.Rev.D | Phys.Rev.D76:094025,2007 | 10.1103/PhysRevD.76.094025 | null | hep-ph | null | We study the lowest-lying scalar mesons in the QCD sum rule by considering
them as tetraquark states. We find that there are five independent currents for
each state with a certain flavor structure. By forming linear combinations, we
find that some mixed currents give reliable QCD sum rules. Among various
tetraquark currents, we consider those which are constructed by the diquarks
having anti-symmetric and symmetric flavor structures. That the results of the
QCD sum rule derived from the two types of currents are similar suggests that
the tetraquark states can have a large mixing between different flavor
structures.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:21:32 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 07:59:05 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
0707.4587 | Ilan Degani Dr. | Ilan Degani | Observations on Gaussian bases for Schrodinger's equation | null | null | null | null | physics.comp-ph physics.chem-ph | null | One of the few methods for generating efficient function spaces for multi-D
Schrodinger eigenproblems is given by Garashchuk and Light in J.Chem.Phys. 114
(2001) 3929. Their Gaussian basis functions are wider and sparser in high
potential regions, and narrower and denser in low ones. We suggest a
modification of their approach based on the following observation: In very
steep potential regions, wide, sparse, Gaussians should be avoided even if
their centers have high potential values. Our numerical results illustrate that
a dramatic improvement in accuracy may be obtained in this way. We also compare
the errors of collocation to those of a Galerkin approach, test a criterion for
scaling Gaussian widths based on deviation from orthogonality of collocation
eigenfunctions, and suggest a criterion for scaling Gaussian widths based on
Hamiltonian trace minimization.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:24:40 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Degani",
"Ilan",
""
]
] |
0707.4588 | Thomas Wanner | Konstantin Mischaikow, Thomas Wanner | Probabilistic validation of homology computations for nodal domains | Published at http://dx.doi.org/10.1214/105051607000000050 in the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2007, Vol. 17, No. 3, 980-1018 | 10.1214/105051607000000050 | IMS-AAP-AAP419 | math.PR | null | Homology has long been accepted as an important computable tool for
quantifying complex structures. In many applications, these structures arise as
nodal domains of real-valued functions and are therefore amenable only to a
numerical study based on suitable discretizations. Such an approach immediately
raises the question of how accurate the resulting homology computations are. In
this paper, we present a probabilistic approach to quantifying the validity of
homology computations for nodal domains of random fields in one and two space
dimensions, which furnishes explicit probabilistic a priori bounds for the
suitability of certain discretization sizes. We illustrate our results for the
special cases of random periodic fields and random trigonometric polynomials.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:25:17 GMT"
}
] | 2020-05-29T00:00:00 | [
[
"Mischaikow",
"Konstantin",
""
],
[
"Wanner",
"Thomas",
""
]
] |
0707.4589 | Anna-Zuzana Dubnickova | E. Bartos, S. Dubnicka, A.Z. Dubnickova and E.A. Kuraev | Sum Rules for Total Cross-Sections of Hadron Photo-Production on
Pseudoscalar Mesons and Octet Baryons | Talk given at XLI Winter School PNPI, Repino, 19-25 February, 2007 | null | null | null | hep-ph | null | Considering very high energy peripheral electron-hadron scattering with a
production of hadronic state X moving closely to the direction of initial
hadron the Weizs\"acker-Williams like expression, relating the difference of
q^2-dependent differential cross-sections of DIS processes to the convergent
integral over the difference of the total hadron photo-production
cross-sections on hadros, is derived. Then, exploiting analytic properties of
the forward retarded Compton scattering amplitude on the same hadrons, first,
the sum rules are derived bringing into relation hadron electromagnetic form
factors with the difference of the q^2-dependent differential cross-sections of
DIS, then using Weizs\"acker-Williams like expression and taking the derivative
of both sides according to ${\bf q^2}$ for ${\bf q^2} \to 0$ one comes to new
universal hadron sum rules relating hadron static parameters to the convergent
integral over the difference of the total hadron photo-production
cross-sections on hadrons.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:59:42 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Bartos",
"E.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Kuraev",
"E. A.",
""
]
] |
0707.4590 | Lars Tiemann | L. Tiemann, J. G. S. Lok, W. Dietsche, K. von Klitzing, K. Muraki, D.
Schuh, W. Wegscheider | Exciton condensate at a total filling factor of 1 in Corbino 2D electron
bilayers | null | Phys. Rev. B 77, 033306 (2008) | 10.1103/PhysRevB.77.033306 | null | cond-mat.mes-hall cond-mat.str-el | null | Magneto-transport and drag measurements on a quasi-Corbino 2D electron
bilayer at the systems total filling factor 1 (v_tot=1) reveal a drag voltage
that is equal in magnitude to the drive voltage as soon as the two layers begin
to form the expected v_tot=1 exciton condensate. The identity of both voltages
remains present even at elevated temperatures of 0.25 K. The conductance in the
current carrying layer vanishes only in the limit of strong coupling between
the two layers and at T->0 K which suggests the presence of an excitonic
circular current.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:14:53 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 13:50:49 GMT"
}
] | 2009-07-16T00:00:00 | [
[
"Tiemann",
"L.",
""
],
[
"Lok",
"J. G. S.",
""
],
[
"Dietsche",
"W.",
""
],
[
"von Klitzing",
"K.",
""
],
[
"Muraki",
"K.",
""
],
[
"Schuh",
"D.",
""
],
[
"Wegscheider",
"W.",
""
]
] |
0707.4591 | Theodore G. Erler | Theodore Erler | Tachyon Vacuum in Cubic Superstring Field Theory | 16 pages, 2 figures | JHEP 0801:013,2008 | 10.1088/1126-6708/2008/01/013 | null | hep-th | null | In this paper we give an exact analytic solution for tachyon condensation in
the modified (picture 0) cubic superstring field theory. We prove the absence
of cohomology and, crucially, reproduce the correct value for the D-brane
tension. The solution is surprising for two reasons: First, the existence of a
tachyon vacuum in this theory has not been definitively established in the
level expansion. Second, the solution {\it vanishes} in the GSO$(-)$ sector,
implying a ``tachyon vacuum'' solution exists even for a {\it BPS} D-brane.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:39:35 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Erler",
"Theodore",
""
]
] |
0707.4592 | Juan Mateos Guilarte | A. Alonso Izquierdo, W. Garcia Fuertes, M. de la Torre Mayado, J.
Mateos Guilarte | One loop corrections to the mass of self-dual semi-local planar
topological solitons | Latex file, 29 pages, 10 Tables, 10 Figures. Version to appear in
Nuclear Physics B | Nucl.Phys.B797:431-463,2008 | 10.1016/j.nuclphysb.2007.11.023 | null | hep-th | null | A formula is derived that allows the computation of one-loop mass shifts for
self-dual semilocal topological solitons. These extended objects, which in
three spatial dimensions are called semi-local strings, arise in a generalized
Abelian Higgs model with a doublet of complex Higgs fields. Having a mixture of
global, SU(2), and local (gauge), U(1), symmetries, this weird system may seem
bizarre, but it is in fact the bosonic sector of electro-weak theory when the
weak mixing angle is of 90 degrees. The procedure for computing the
semi-classical mass shifts is based on canonical quantization and heat
kernel/zeta function regularization methods.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:43:13 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 10:16:30 GMT"
},
{
"version": "v3",
"created": "Tue, 20 Nov 2007 12:21:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Izquierdo",
"A. Alonso",
""
],
[
"Fuertes",
"W. Garcia",
""
],
[
"Mayado",
"M. de la Torre",
""
],
[
"Guilarte",
"J. Mateos",
""
]
] |
0707.4593 | Carlo Giunti | Carlo Giunti and Marco Laveder | nu_e Disappearance in MiniBooNE | 17 pages. Final version published in Phys. Rev. D 77, 093002 (2008) | Phys.Rev.D77:093002,2008 | 10.1103/PhysRevD.77.093002 | null | hep-ph hep-ex physics.acc-ph | null | The anomalous excess of low-energy nu_e events measured in the MiniBooNE
experiment is explained through a renormalization of the absolute neutrino flux
and a simultaneous disappearance of the nu_e's in the beam, which is compatible
with that indicated by the results of Gallium radioactive source experiments.
We present the results of the fit of MiniBooNE data (P(nu_e->nu_e) = 0.64 +0.08
-0.07) and the combined fit of MiniBooNE data and the nu_e disappearance
measured in the Gallium radioactive source experiments, which gives
P(nu_e->nu_e) = 0.82 +- 0.04. We show that our interpretation of the data is
also compatible with an old indication in favor of nu_e disappearance found
from the analysis of the results of beam-dump experiments, leading to
P(nu_e->nu_e) = 0.80 +0.03 -0.04.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:23:22 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 08:17:14 GMT"
},
{
"version": "v3",
"created": "Thu, 29 May 2008 09:48:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giunti",
"Carlo",
""
],
[
"Laveder",
"Marco",
""
]
] |
0707.4594 | Christof Sparber | Lukas Neumann, Christof Sparber | Stability of steady states in kinetic Fokker-Planck equations for Bosons
and Fermions | 13 pages. to appear in Comm. Math. Sci | null | null | null | math.AP math-ph math.MP | null | We study a class of nonlinear kinetic Fokker-Planck type equations modeling
quantum particles which obey the Bose-Einstein and Fermi-Dirac statistics,
respectively. We establish the existence of classical solutions in the
perturbative regime and prove exponential convergence towards the equilibrium.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:44:52 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Neumann",
"Lukas",
""
],
[
"Sparber",
"Christof",
""
]
] |
0707.4595 | Yury Nikolayevsky | Y. Nikolayevsky | Einstein solvmanifolds with a simple Einstein derivation | 11 pages | null | null | null | math.DG | null | The structure of a solvable Lie groups admitting an Einstein left-invariant
metric is, in a sense, completely determined by the nilradical of its Lie
algebra. We give an easy-to-check necessary and sufficient condition for a
nilpotent algebra to be an Einstein nilradical whose Einstein derivation has
simple eigenvalues. As an application, we classify filiform Einstein
nilradicals (modulo known classification results on filiform graded Lie
algebras).
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:10:53 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Nikolayevsky",
"Y.",
""
]
] |
0707.4596 | Zhiyi Chi | Zhiyi Chi | Uniform convergence of exact large deviations for renewal reward
processes | Published at http://dx.doi.org/10.1214/105051607000000023 in the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2007, Vol. 17, No. 3, 1019-1048 | 10.1214/105051607000000023 | IMS-AAP-AAP0224 | math.PR | null | Let (X_n,Y_n) be i.i.d. random vectors. Let W(x) be the partial sum of Y_n
just before that of X_n exceeds x>0. Motivated by stochastic models for neural
activity, uniform convergence of the form $\sup_{c\in I}|a(c,x)\operatorname
{Pr}\{W(x)\gecx\}-1|=o(1)$, $x\to\infty$, is established for probabilities of
large deviations, with a(c,x) a deterministic function and I an open interval.
To obtain this uniform exact large deviations principle (LDP), we first
establish the exponentially fast uniform convergence of a family of renewal
measures and then apply it to appropriately tilted distributions of X_n and the
moment generating function of W(x). The uniform exact LDP is obtained for cases
where X_n has a subcomponent with a smooth density and Y_n is not a linear
transform of X_n. An extension is also made to the partial sum at the first
exceedance time.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:02:05 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Chi",
"Zhiyi",
""
]
] |
0707.4597 | Chao Tian | Chao Tian and Suhas N. Diggavi | Side-information Scalable Source Coding | 35 pages, submitted to IEEE Transaction on Information Theory | null | null | null | cs.IT math.IT | null | The problem of side-information scalable (SI-scalable) source coding is
considered in this work, where the encoder constructs a progressive
description, such that the receiver with high quality side information will be
able to truncate the bitstream and reconstruct in the rate distortion sense,
while the receiver with low quality side information will have to receive
further data in order to decode. We provide inner and outer bounds for general
discrete memoryless sources. The achievable region is shown to be tight for the
case that either of the decoders requires a lossless reconstruction, as well as
the case with degraded deterministic distortion measures. Furthermore we show
that the gap between the achievable region and the outer bounds can be bounded
by a constant when square error distortion measure is used. The notion of
perfectly scalable coding is introduced as both the stages operate on the
Wyner-Ziv bound, and necessary and sufficient conditions are given for sources
satisfying a mild support condition. Using SI-scalable coding and successive
refinement Wyner-Ziv coding as basic building blocks, a complete
characterization is provided for the important quadratic Gaussian source with
multiple jointly Gaussian side-informations, where the side information quality
does not have to be monotonic along the scalable coding order. Partial result
is provided for the doubly symmetric binary source with Hamming distortion when
the worse side information is a constant, for which one of the outer bound is
strictly tighter than the other one.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:02:53 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Tian",
"Chao",
""
],
[
"Diggavi",
"Suhas N.",
""
]
] |
0707.4598 | Dan Maoz | Dan Maoz | On the fraction of intermediate-mass close binaries that explode as
type-Ia supernovae | MNRAS, accepted version | null | 10.1111/j.1365-2966.2007.12697.x | NSF-KITP-07-161 | astro-ph | null | Type-Ia supernovae (SNe-Ia) are thought to result from a thermonuclear
runaway in white dwarfs (WDs) that approach the Chandrasekhar limit, either
through accretion from a companion or a merger with another WD. I compile
observational estimates of the fraction eta of intermediate-mass stars that
eventually explode as SNe-Ia, supplement them with several new estimates, and
compare them self-consistently. The estimates are based on five different
methods, each utilising some observable related to the SN-Ia rate, combined
with assumptions regarding the IMF: the ratio of SN-Ia to core-collapse rates
in star-forming galaxies; the SN-Ia rate per unit star-formation rate; the
SN-Ia rate per unit stellar mass; the iron to stellar mass ratio in galaxy
clusters; and the abundance ratios in galaxy clusters. The five methods
indicate that a fraction in the range eta~2-40% of all stars with initial
masses of 3-8 M_sun (the generally assumed SN-Ia progenitors) explode as
SNe-Ia. A fraction of eta~15% is consistent with all five methods for a range
of plausible IMFs. Considering also the binarity fraction among such stars, the
mass ratio distribution, the separation distribution, and duplicity (every
binary can produce only one SN-Ia explosion), this implies that nearly every
intermediate mass close binary ends up as a SN-Ia, or possibly more SNe-Ia than
progenitor systems. Theoretically expected fractions are generally one to two
orders of magnitude lower. The problem could be solved: if all the
observational estimates are in error; or with a ``middle-heavy'' IMF; or by
some mechanism that strongly enhances the efficiency of binary evolution toward
SN-Ia explosion; or by a non-binary origin for SNe-Ia.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:10:25 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 11:07:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maoz",
"Dan",
""
]
] |
0707.4599 | Dimitri Alexei Gadotti | Dimitri Gadotti (1,2,3), Lia Athanassoula (2), Luis Carrasco (4),
Albert Bosma (2), Ronaldo de Souza (1), Elsa Recillas (4) ((1) IAG/USP -
Brazil, (2) LAM/OAMP - France, (3) MPA - Germany, (4) INAOE - Mexico) | Near-Infrared Surface Photometry of a Sample of Barred Galaxies | Accepted for publication in MNRAS; 25 pages, including 7 tables and
13 figures; full resolution version available at
http://www.mpa-garching.mpg.de/~dimitri/cananea1.pdf - source code to perform
calculations in Appendix A (2D analytical bar deprojection) available at
http://www.mpa-garching.mpg.de/~dimitri/deprojell.f | null | 10.1111/j.1365-2966.2007.12295.x | null | astro-ph | null | We have obtained deep J and Ks images of a sample of nine barred galaxies in
order to collect a reliable and homogeneous set of images to which N-body
simulations of barred galaxies will be compared. The observations were
performed using the new near-infrared camera available at the 2.1-m telescope
of the Observatorio Astrofisico Guillermo Haro (OAGH) in Cananea, Sonora,
Mexico. We present the results of surface photometry techniques applied to the
observed images, as well as to the deprojected images. These results include
radial profiles of surface brightness (elliptically averaged), colour, position
angle, ellipticity and the b4 Fourier component. In addition, we present
isophotal maps, colour maps, surface brightness profiles along the bar major
and minor axes, characteristic radial scale-lengths and bar length estimates.
We discuss how projection effects can influence these measurements and the
uncertainties introduced by deprojecting galaxy images. We show that analytical
expressions can be used to obtain reliable estimates of deprojected bar
lengths, ellipticities and position angles directly from the observed images.
These expressions are based on the assumption that the outer parts of the bar
are vertically thin, as shown by theoretical work. The usefulness of our data
in addressing issues on bar formation and evolution is also discussed. In
particular, we present results showing a steep drop in the ellipticity profile,
as expected for bar formation processes in which the dark matter halo plays a
fundamental role. Furthermore, we show that the location of this drop is a good
indicator of the end of the bar in strongly barred galaxies, as predicted by
numerical models.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:19:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gadotti",
"Dimitri",
""
],
[
"Athanassoula",
"Lia",
""
],
[
"Carrasco",
"Luis",
""
],
[
"Bosma",
"Albert",
""
],
[
"de Souza",
"Ronaldo",
""
],
[
"Recillas",
"Elsa",
""
]
] |
0707.4600 | H. Christian Gromoll | H. Christian Gromoll, {\L}ukasz Kruk | Heavy traffic limit for a processor sharing queue with soft deadlines | Published at http://dx.doi.org/10.1214/105051607000000014 in the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2007, Vol. 17, No. 3, 1049-1101 | 10.1214/105051607000000014 | IMS-AAP-AAP0216 | math.PR | null | This paper considers a GI/GI/1 processor sharing queue in which jobs have
soft deadlines. At each point in time, the collection of residual service times
and deadlines is modeled using a random counting measure on the right
half-plane. The limit of this measure valued process is obtained under
diffusion scaling and heavy traffic conditions and is characterized as a
deterministic function of the limiting queue length process. As special cases,
one obtains diffusion approximations for the lead time profile and the profile
of times in queue. One also obtains a snapshot principle for sojourn times.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:36:34 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Gromoll",
"H. Christian",
""
],
[
"Kruk",
"Łukasz",
""
]
] |
0707.4601 | Nigel Hussey | A. Narduzzo, G. Albert, M. M. J. French, N. Mangkorntong, M. Nohara,
H. Takagi and N. E. Hussey | Violation of the isotropic-$\ell$ approximation in overdoped
La_{2-x}Sr_xCuO_4 | 4 pages, 4 figures | null | 10.1103/PhysRevB.77.220502 | null | cond-mat.supr-con cond-mat.str-el | null | Magnetotransport measurements on the overdoped cuprate La_{1.7}Sr_{0.3}CuO_4
are fitted using the Ong construction and band parameters inferred from
angle-resolved photoemission. Within a band picture, the low temperature Hall
data can only be fitted satisfactorily by invoking strong basal-plane
anisotropy in the mean-free-path $\ell$. This violation of the isotropic-$\ell$
approximation supports a picture of dominant small-angle elastic scattering in
cuprates due to out-of-plane substitutional disorder. We show that both band
anisotropy and anisotropy in the elastic scattering channel strongly
renormalize the Hall coefficient in overdoped La_{2-x}Sr_xCuO_4 over a wide
doping and temperature range.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:42:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Narduzzo",
"A.",
""
],
[
"Albert",
"G.",
""
],
[
"French",
"M. M. J.",
""
],
[
"Mangkorntong",
"N.",
""
],
[
"Nohara",
"M.",
""
],
[
"Takagi",
"H.",
""
],
[
"Hussey",
"N. E.",
""
]
] |
0707.4602 | Lucia Caporaso | Lucia Caporaso | Geometry of the theta divisor of a compactified jacobian | 36 pages. Final version, to appear in JEMS | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the theta divisor of the compactified jacobian of a nodal, possibly
reducible, curve. We compute its irreducible components and give it a geometric
interpretation consistent with the classical Brill-Noether theory of smooth
curves. Some applications on hyperelliptic stable curves are appended.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 12:46:34 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 12:42:47 GMT"
},
{
"version": "v3",
"created": "Sat, 3 May 2008 08:52:11 GMT"
},
{
"version": "v4",
"created": "Sat, 4 Oct 2008 09:04:04 GMT"
}
] | 2008-10-04T00:00:00 | [
[
"Caporaso",
"Lucia",
""
]
] |
0707.4603 | Jennifer Sobeck | Jennifer S. Sobeck, James E. Lawler, Christopher Sneden | Improved Laboratory Transition Probabilities for Neutral Chromium and
Re-determination of the Chromium Abundance for the Sun and Three Stars | 44 pages, 6 figures | null | 10.1086/519987 | null | astro-ph | null | Branching fraction measurements from Fourier transform spectra in conjunction
with published radiative lifetimes are used to determine transition
probabilities for 263 lines of neutral chromium. These laboratory values are
employed to derive a new photospheric abundance for the Sun: log $\epsilon$(Cr
I)$_{\odot}$ = 5.64$\pm$0.01 ($\sigma = 0.07$). These Cr I solar abundances do
not exhibit any trends with line strength nor with excitation energy and there
were no obvious indications of departures from LTE. In addition, oscillator
strengths for singly-ionized chromium recently reported by the FERRUM Project
are used to determine: log $\epsilon$(Cr II)$_{\odot}$ = 5.77$\pm$0.03 ($\sigma
= 0.13$). Transition probability data are also applied to the spectra of three
stars: HD 75732 (metal-rich dwarf), HD 140283 (metal-poor subgiant), and CS
22892-052 (metal-poor giant). In all of the selected stars, Cr I is found to be
underabundant with respect to Cr II. The possible causes for this abundance
discrepancy and apparent ionization imbalance are discussed.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:03:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sobeck",
"Jennifer S.",
""
],
[
"Lawler",
"James E.",
""
],
[
"Sneden",
"Christopher",
""
]
] |
0707.4604 | Yan Wang | Yan Wang, Jia-An Yan, M. Y. Chou | Electronic and Vibrational Properties of gamma-AlH3 | 18 pages, 9 figures, submited to PRB | null | 10.1103/PhysRevB.77.014101 | null | cond-mat.mtrl-sci | null | Aluminum hydride (alane) AlH_3 is an important material in hydrogen storage
applications. It is known that AlH_3 exists in multiply forms of polymorphs,
where $\alpha$-AlH_3 is found to be the most stable with a hexagonal structure.
Recent experimental studies on $\gamma$-AlH_3 reported an orthorhombic
structure with a unique double-bridge bond between certain Al and H atoms. This
was not found in $\alpha$-AlH_3 or other polymorphs. Using density functional
theory, we have investigated the energetics, and the structural, electronic,
and phonon vibrational properties for the newly reported $\gamma$-AlH_3
structure. The current calculation concludes that $\gamma$-AlH_3 is less stable
than $\alpha$-AlH_3 by 2.1 KJ/mol. Interesting binding features associated with
the unique geometry of $\gamma$-AlH3 are discussed from the calculated
electronic properties and phonon vibrational modes. The binding of H-s with
higher energy Al-p,d orbitals is enhanced within the double-bridge arrangement,
giving rise to a higher electronic energy for the system. Distinguishable new
features in the vibrational spectrum of $\gamma$-AlH_3 were attributed to the
double-bridge and hexagonal-ring structures.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 00:37:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Yan",
""
],
[
"Yan",
"Jia-An",
""
],
[
"Chou",
"M. Y.",
""
]
] |
0707.4605 | Gert Heckman | Maris van Haandel, Gert Heckman | Teaching the Kepler laws for freshmen | 12 pages | null | null | null | math.SG math.HO | null | We present a natural proof of Kepler's law of ellipses in the spirit of
Euclidean geometry. Moreover we discuss two existing Euclidean geometric
proofs, one by Feynman in hist Lost Lecture from 1964 and the other by Newton
in the Principia of 1687.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:04:48 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"van Haandel",
"Maris",
""
],
[
"Heckman",
"Gert",
""
]
] |
0707.4606 | Zhong Fang | XiaoYu Deng, Xi Dai, Zhong Fang | LDA+Gutzwiller Method for Correlated Electron Systems | 4 pages, 3 figures, 1 table | EPL, 83, 37008(2008) | 10.1209/0295-5075/83/37008 | null | cond-mat.str-el cond-mat.mtrl-sci | null | Combining the density functional theory (DFT) and the Gutzwiller variational
approach, a LDA+Gutzwiller method is developed to treat the correlated electron
systems from {\it ab-initio}. All variational parameters are self-consistently
determined from total energy minimization. The method is computationally
cheaper, yet the quasi-particle spectrum is well described through kinetic
energy renormalization. It can be applied equally to the systems from weakly
correlated metals to strongly correlated insulators. The calculated results for
SrVO$_3$, Fe, Ni and NiO, show dramatic improvement over LDA and LDA+U.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:20:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Deng",
"XiaoYu",
""
],
[
"Dai",
"Xi",
""
],
[
"Fang",
"Zhong",
""
]
] |
0707.4607 | Colin Cotter | C. J. Cotter, D. A. Ham, C. C. Pain and S. Reich | LBB Stability of a Mixed Discontinuous/Continuous Galerkin Finite
Element Pair | null | null | null | null | math.NA | null | We introduce a new mixed discontinuous/continuous Galerkin finite element for
solving the 2- and 3-dimensional wave equations and equations of incompressible
flow. The element, which we refer to as P1dg-P2, uses discontinuous piecewise
linear functions for velocity and continuous piecewise quadratic functions for
pressure. The aim of introducing the mixed formulation is to produce a new
flexible element choice for triangular and tetrahedral meshes which satisfies
the LBB stability condition and hence has no spurious zero-energy modes. We
illustrate this property with numerical integrations of the wave equation in
two dimensions, an analysis of the resultant discrete Laplace operator in two
and three dimensions, and a normal mode analysis of the semi-discrete wave
equation in one dimension.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:22:01 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Cotter",
"C. J.",
""
],
[
"Ham",
"D. A.",
""
],
[
"Pain",
"C. C.",
""
],
[
"Reich",
"S.",
""
]
] |
0707.4608 | Katarzyna Grebieszkow | K. Grebieszkow, C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L.
Betev, H. Bia{\l}kowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R.
Bramm, P. Bun\v{c}i\'c, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J.G.
Cramer, P. Csat\'o, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka,
V. Friese, J. G\'al, M. Ga\'zdzicki, V. Genchev, G. Georgopoulos, E.
G{\l}adysz, S. Hegyi, C. H\"ohne, K. Kadija, A. Karev, D. Kikola, M.
Kliemant, S. Kniege, V.I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I.
Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. L\'evai, L. Litov,
B. Lungwitz, M. Makariev, A.I. Malakhov, M. Mateev, G.L. Melkumov, A.
Mischke, M. Mitrovski, J. Moln\'ar, St. Mr\'owczy\'nski, V. Nicolic, G.
P\'alla, A.D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J.
Pluta, D. Prindle, F. P\"uhlhofer, R. Renfordt, C. Roland, G. Roland, M.
Rybczy\'nski, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth,
F. Sikl\'er, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock,
C. Strabel, H. Str\"obele, T. Susa, I. Szentp\'etery, J. Sziklai, M. Szuba,
P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G.I. Veres, G.
Vesztergombi, D. Vrani\'c, A. Wetzler, Z. W{\l}odarczyk, A. Wojtaszek, I.K.
Yoo, J. Zim\'anyi | Event-by-event transverse momentum fluctuations in nuclear collisions at
CERN SPS | proceedings article from CPOD07 (figure 7 - updated, reference 2 -
modified) | PoSCPOD07:022,2007 | null | null | nucl-ex | null | The latest NA49 results on event-by-event transverse momentum fluctuations
are presented for central Pb+Pb interactions over the whole SPS energy range
(20A - 158A GeV). Two different methods are applied: evaluating the
$\Phi_{p_{T}}$ fluctuation measure and studying two-particle transverse
momentum correlations. The obtained results are compared to predictions of the
UrQMD model. The results on the energy dependence are compared to the NA49 data
on the system size dependence. The NA61 (SHINE, NA49-future) strategy of
searching of the QCD critical end-point is also discussed.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 11:27:57 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 14:57:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grebieszkow",
"K.",
""
],
[
"Alt",
"C.",
""
],
[
"Anticic",
"T.",
""
],
[
"Baatar",
"B.",
""
],
[
"Barna",
"D.",
""
],
[
"Bartke",
"J.",
""
],
[
"Betev",
"L.",
""
],
[
"Białkowska",
"H.",
""
],
[
"Blume",
"C.",
""
],
[
"Boimska",
"B.",
""
],
[
"Botje",
"M.",
""
],
[
"Bracinik",
"J.",
""
],
[
"Bramm",
"R.",
""
],
[
"Bunčić",
"P.",
""
],
[
"Cerny",
"V.",
""
],
[
"Christakoglou",
"P.",
""
],
[
"Chung",
"P.",
""
],
[
"Chvala",
"O.",
""
],
[
"Cramer",
"J. G.",
""
],
[
"Csató",
"P.",
""
],
[
"Dinkelaker",
"P.",
""
],
[
"Eckardt",
"V.",
""
],
[
"Flierl",
"D.",
""
],
[
"Fodor",
"Z.",
""
],
[
"Foka",
"P.",
""
],
[
"Friese",
"V.",
""
],
[
"Gál",
"J.",
""
],
[
"Gaździcki",
"M.",
""
],
[
"Genchev",
"V.",
""
],
[
"Georgopoulos",
"G.",
""
],
[
"Gładysz",
"E.",
""
],
[
"Hegyi",
"S.",
""
],
[
"Höhne",
"C.",
""
],
[
"Kadija",
"K.",
""
],
[
"Karev",
"A.",
""
],
[
"Kikola",
"D.",
""
],
[
"Kliemant",
"M.",
""
],
[
"Kniege",
"S.",
""
],
[
"Kolesnikov",
"V. I.",
""
],
[
"Kornas",
"E.",
""
],
[
"Korus",
"R.",
""
],
[
"Kowalski",
"M.",
""
],
[
"Kraus",
"I.",
""
],
[
"Kreps",
"M.",
""
],
[
"Laszlo",
"A.",
""
],
[
"Lacey",
"R.",
""
],
[
"van Leeuwen",
"M.",
""
],
[
"Lévai",
"P.",
""
],
[
"Litov",
"L.",
""
],
[
"Lungwitz",
"B.",
""
],
[
"Makariev",
"M.",
""
],
[
"Malakhov",
"A. I.",
""
],
[
"Mateev",
"M.",
""
],
[
"Melkumov",
"G. L.",
""
],
[
"Mischke",
"A.",
""
],
[
"Mitrovski",
"M.",
""
],
[
"Molnár",
"J.",
""
],
[
"Mrówczyński",
"St.",
""
],
[
"Nicolic",
"V.",
""
],
[
"Pálla",
"G.",
""
],
[
"Panagiotou",
"A. D.",
""
],
[
"Panayotov",
"D.",
""
],
[
"Petridis",
"A.",
""
],
[
"Peryt",
"W.",
""
],
[
"Pikna",
"M.",
""
],
[
"Pluta",
"J.",
""
],
[
"Prindle",
"D.",
""
],
[
"Pühlhofer",
"F.",
""
],
[
"Renfordt",
"R.",
""
],
[
"Roland",
"C.",
""
],
[
"Roland",
"G.",
""
],
[
"Rybczyński",
"M.",
""
],
[
"Rybicki",
"A.",
""
],
[
"Sandoval",
"A.",
""
],
[
"Schmitz",
"N.",
""
],
[
"Schuster",
"T.",
""
],
[
"Seyboth",
"P.",
""
],
[
"Siklér",
"F.",
""
],
[
"Sitar",
"B.",
""
],
[
"Skrzypczak",
"E.",
""
],
[
"Slodkowski",
"M.",
""
],
[
"Stefanek",
"G.",
""
],
[
"Stock",
"R.",
""
],
[
"Strabel",
"C.",
""
],
[
"Ströbele",
"H.",
""
],
[
"Susa",
"T.",
""
],
[
"Szentpétery",
"I.",
""
],
[
"Sziklai",
"J.",
""
],
[
"Szuba",
"M.",
""
],
[
"Szymanski",
"P.",
""
],
[
"Trubnikov",
"V.",
""
],
[
"Varga",
"D.",
""
],
[
"Vassiliou",
"M.",
""
],
[
"Veres",
"G. I.",
""
],
[
"Vesztergombi",
"G.",
""
],
[
"Vranić",
"D.",
""
],
[
"Wetzler",
"A.",
""
],
[
"Włodarczyk",
"Z.",
""
],
[
"Wojtaszek",
"A.",
""
],
[
"Yoo",
"I. K.",
""
],
[
"Zimányi",
"J.",
""
]
] |
0707.4609 | Biagio Di Micco | The KLOE collaboration | Study of the radiative decay phi to a0(980) gamma with the KLOE detector | 9 pages, 7 figures, Contributed paper to Lepton Photon 2007 | null | null | null | hep-ex | null | A sample of 1.25x10^9 phi decays, collected with the KLOE detector at the
Frascati phi-factory DAFNE at center of mass energy ~ Mphi, has been used to
study the radiative decay phi to eta pi0 gamma. This decay is dominated by phi
to a0(980) gamma. Two decay chains, corresponding to eta to gamma gamma and eta
to pi+ pi- pi0, have been selected. We found respectively: Br(phi to eta pi0
gamma)=(6.92 +/- 0.10 (stat.) +/- 0.20 (syst.))x10^(-5) and (7.19 +/- 0.17
(stat.) +/- 0.24 (syst.))x 10 ^(-5). The eta pi0 invariant mass distributions
have been fitted to obtain the relevant a0(980) parameters.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:22:47 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"The KLOE collaboration",
"",
""
]
] |
0707.4610 | Joan Verdera | Joan Mateu, Joan Orobitg and Joan Verdera | Estimates for the maximal singular integral in terms of the singular
integral:the case of even kernels | Minor misprints and English inaccuracies corrected, references
updated. To appear in Annals on Math | Annals of Mathematics 174 (2011), 1429-1483 | null | null | math.CA math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to describe the smooth homogeneous
Calderon-Zygmund operators for which the maximal singular integral T*f may be
controlled by the singular integral Tf. We consider two types of control. The
first is the L2 estimate of T*f by Tf, namely the estimate of the L2 norm of
T*f by a constant times the L2 norm of Tf. The second is the pointwise estimate
of T*f(x) by a constant times M(Tf)(x), where M denotes the Hardy-Littlewood
maximal operator. Notice that this is an improved variant of Cotlar's
inequality, because the term Mf(x) is missing on the right hand side. Our main
result states that, for even operators, both are equivalent to a purely
algebraic condition formulated in terms of the expansion of the kernel in
spherical harmonics. The condition holds by higher order Riesz transforms,
which then satisfy an improved version of Cotlar's inequality
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:25:36 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Dec 2010 17:39:20 GMT"
}
] | 2012-07-11T00:00:00 | [
[
"Mateu",
"Joan",
""
],
[
"Orobitg",
"Joan",
""
],
[
"Verdera",
"Joan",
""
]
] |
0707.4611 | Henry C. Fu | Henry C. Fu, Thomas R. Powers, and Charles W. Wolgemuth | Theory of swimming filaments in viscoelastic media | 4 pages, 3 figures | Phys. Rev. Lett., 99, 258101 (2007) | 10.1103/PhysRevLett.99.258101 | null | cond-mat.soft | null | Motivated by the swimming of sperm in the non-Newtonian fluids of the female
mammalian reproductive tract, we examine the swimming of filaments in the
nonlinear viscoelastic Upper Convected Maxwell model. We obtain the swimming
velocity and hydrodynamic force exerted on an infinitely long cylinder with
prescribed beating pattern. We use these results to examine the swimming of a
simplified sliding-filament model for a sperm flagellum. Viscoelasticity tends
to decrease swimming speed, and changes in the beating patterns due to
viscoelasticity can reverse swimming direction.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:27:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fu",
"Henry C.",
""
],
[
"Powers",
"Thomas R.",
""
],
[
"Wolgemuth",
"Charles W.",
""
]
] |
0707.4612 | Thomas {\O}stergaard S{\o}rensen | Anna Dall'Acqua (TU Munich), Thomas {\O}stergaard S{\o}rensen (Aalborg
University), and Edgardo Stockmeyer (LMU Munich) | Hartree-Fock theory for pseudorelativistic atoms | null | Ann. Henri Poincar\'e 9 (2008), no. 4, 711--742 | 10.1007/s00023-008-0370-z | null | math-ph math.MP | null | We study the Hartree-Fock model for pseudorelativistic atoms, that is, atoms
where the kinetic energy of the electrons is given by the pseudorelativistic
operator \sqrt{(pc)^2+(mc^2)^2}-mc^2. We prove the existence of a Hartree-Fock
minimizer, and prove regularity away from the nucleus and pointwise exponential
decay of the corresponding orbitals.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:37:23 GMT"
}
] | 2013-10-30T00:00:00 | [
[
"Dall'Acqua",
"Anna",
"",
"TU Munich"
],
[
"Sørensen",
"Thomas Østergaard",
"",
"Aalborg\n University"
],
[
"Stockmeyer",
"Edgardo",
"",
"LMU Munich"
]
] |
0707.4613 | Massimo Rontani | Giuseppe Maruccio, Martin Janson, Andreas Schramm, Christian Meyer,
Tomohiro Matsui, Christian Heyn, Wolfgang Hansen, Roland Wiesendanger,
Massimo Rontani, Elisa Molinari | Correlation Effects in Wave Function Mapping of Molecular Beam Epitaxy
Grown Quantum Dots | PDF file, 20 pages, 6 color figures | Nano Letters Vol. 7, No. 9, pages 2701-2706 (2007). | 10.1021/nl071133m | null | cond-mat.mes-hall cond-mat.str-el | null | We investigate correlation effects in the regime of a few electrons in
uncapped InAs quantum dots by tunneling spectroscopy and wave function (WF)
mapping at high tunneling currents where electron-electron interactions become
relevant. Four clearly resolved states are found, whose approximate symmetries
are roughly s and p, in order of increasing energy. Because the major axes of
the p-like states coincide, the WF sequence is inconsistent with the imaging of
independent-electron orbitals. The results are explained in terms of many-body
tunneling theory, by comparing measured maps with those calculated by taking
correlation effects into account.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:29:20 GMT"
}
] | 2007-09-13T00:00:00 | [
[
"Maruccio",
"Giuseppe",
""
],
[
"Janson",
"Martin",
""
],
[
"Schramm",
"Andreas",
""
],
[
"Meyer",
"Christian",
""
],
[
"Matsui",
"Tomohiro",
""
],
[
"Heyn",
"Christian",
""
],
[
"Hansen",
"Wolfgang",
""
],
[
"Wiesendanger",
"Roland",
""
],
[
"Rontani",
"Massimo",
""
],
[
"Molinari",
"Elisa",
""
]
] |
0707.4614 | Andrey Chugunov Mr. | A.I. Chugunov (1), P. Haensel ((1) Ioffe Physico-Technical
Instititute, St.Petersburg; (2) N.Copernicus Astronomical Center, Warsaw) | Thermal conductivity of ions in a neutron star envelope | 12 pages, 5 figures; to appear in MNRAS | MNRAS, 381 (2007), 1143-1153 | 10.1111/j.1365-2966.2007.12301.x | null | astro-ph cond-mat.stat-mech physics.plasm-ph | null | We analyze the thermal conductivity of ions (equivalent to the conductivity
of phonons in crystalline matter) in a neutron star envelope.
We calculate the ion/phonon thermal conductivity in a crystal of atomic
nuclei using variational formalism and performing momentum-space integration by
Monte Carlo method. We take into account phonon-phonon and phonon-electron
scattering mechanisms and show that phonon-electron scattering dominates at not
too low densities. We extract the ion thermal conductivity in ion liquid or gas
from literature.
Numerical values of the ion/phonon conductivity are approximated by
analytical expressions, valid for T>10^5 K and 10^5 g cm^-3 < \rho < 10^14 g
cm^-3. Typical magnetic fields B~10^12 G in neutron star envelopes do not
affect this conductivity although they strongly reduce the electron thermal
conductivity across the magnetic field. The ion thermal conductivity remains
much smaller than the electron conductivity along the magnetic field. However,
in the outer neutron star envelope it can be larger than the electron
conductivity across the field, that is important for heat transport across
magnetic field lines in cooling neutron stars. The ion conductivity can greatly
reduce the anisotropy of heat conduction in outer envelopes of magnetized
neutron stars.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:48:52 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Mar 2008 10:02:59 GMT"
}
] | 2008-03-27T00:00:00 | [
[
"Chugunov",
"A. I.",
""
],
[
"Haensel",
"P.",
""
]
] |
0707.4615 | Vladimir Belyaev | Vladimir B. Belyaev, Werner Sandhas, and Ivan I. Shlyk | New nuclear three-body clusters \phi{NN} | null | Few Body Syst.44:347-349,2008 | 10.1007/s00601-008-0324-5 | null | nucl-th | null | Binding energies of three-body systems of the type \phi+2N are estimated. Due
to the strong attraction between \phi-meson and nucleon, suggested in different
approaches, bound states can appear in systems like \phi+np (singlet and
triplet) and \phi+pp. This indicates the principal possibility of the formation
of new nuclear clusters.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:50:23 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Belyaev",
"Vladimir B.",
""
],
[
"Sandhas",
"Werner",
""
],
[
"Shlyk",
"Ivan I.",
""
]
] |
0707.4616 | Biagio Di Micco | The KLOE collaboration | Measurement of the eta mass at KLOE | 7 pages, 8 figures, Contributed paper to Lepton Photon 2007 | Eur.Phys.J.A38:125-127,2008 | 10.1140/epja/i2008-10659-5 | null | hep-ex | null | An integrated luminosity of 410 pb^(-1), corresponding to ~ 17 million of eta
events, has been analyzed to measure the eta mass using the decay eta to gamma
gamma. The measurement is insensitive to the calorimeter energy calibration and
the systematic error on the measurement is dominated by the uniformity of the
detector response. As a cross check of the method the pi0 mass from the decay
phi to pi0 gamma, pi0 to gamma gamma has been measured and it is in agreement
with the most accurate previous determinations. The result obtained is m(eta) =
547.873 +/- 0.007 (stat.) +/- 0.031 (syst.) MeV, that is today best measurement
of the eta mass.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:40:42 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"The KLOE collaboration",
"",
""
]
] |
0707.4617 | Vadim Vologodsky | Vadim Vologodsky | Integrality of instanton numbers | Revised version | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the results announced in a joint paper (arXiv:hep-th/0603106) with
Maxim Kontsevich and Albert Schwarz.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:43:40 GMT"
},
{
"version": "v2",
"created": "Sat, 12 Jul 2008 11:59:37 GMT"
},
{
"version": "v3",
"created": "Wed, 17 Sep 2008 00:25:48 GMT"
}
] | 2008-09-17T00:00:00 | [
[
"Vologodsky",
"Vadim",
""
]
] |
0707.4618 | Shmuel Onn | Yael Berstein, Jon Lee, Hugo Maruri-Aguilar, Shmuel Onn, Eva
Riccomagno, Robert Weismantel, Henry Wynn | Nonlinear Matroid Optimization and Experimental Design | null | SIAM Journal on Discrete Mathematics, 22:901--919, 2008 | null | null | math.CO cs.CC cs.DM math.OC | null | We study the problem of optimizing nonlinear objective functions over
matroids presented by oracles or explicitly. Such functions can be interpreted
as the balancing of multi-criteria optimization. We provide a combinatorial
polynomial time algorithm for arbitrary oracle-presented matroids, that makes
repeated use of matroid intersection, and an algebraic algorithm for vectorial
matroids.
Our work is partly motivated by applications to minimum-aberration
model-fitting in experimental design in statistics, which we discuss and
demonstrate in detail.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:54:07 GMT"
}
] | 2008-07-24T00:00:00 | [
[
"Berstein",
"Yael",
""
],
[
"Lee",
"Jon",
""
],
[
"Maruri-Aguilar",
"Hugo",
""
],
[
"Onn",
"Shmuel",
""
],
[
"Riccomagno",
"Eva",
""
],
[
"Weismantel",
"Robert",
""
],
[
"Wynn",
"Henry",
""
]
] |
0707.4619 | Markus Dahlem | Markus A. Dahlem, Felix M. Schneider, Anastasiya Panchuk, Gerald
Hiller, Eckehard Schoell, | Control of sub-excitable waves in neural networks by nonlocal coupling | null | null | null | null | nlin.PS nlin.AO | null | Transient wave forms in neural networks with diffusive and nonlocal coupling
have attracted particular interest because they may mediate recruitment of
healthy cortical tissue into a pathological state during migraine. To
investigate this process, we use a reaction-diffusion system of
inhibitor-activator type as a generic model of pathological wave propagation
and set it close to bifurcation in the sub-excitable regime. We report the
influence of various nonlocal connectivity schemes on wave propagation. Wave
propagation can be suppressed with cross coupling inhibitor and activator for
both positive and negative coupling strength K, depending on the connection
length d. The area in the parameter plane (d,K) where this control goal is
achieved resembles a Mexican-hat-type network connectivity. Our results suggest
that nonlocal synaptic transmission can control wave propagation, which may be
of therapeutic value.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 13:56:08 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Dahlem",
"Markus A.",
""
],
[
"Schneider",
"Felix M.",
""
],
[
"Panchuk",
"Anastasiya",
""
],
[
"Hiller",
"Gerald",
""
],
[
"Schoell",
"Eckehard",
""
]
] |
0707.4620 | D. N. Basu | D.N. Basu, P. Roy Chowdhury and C. Samanta | Nuclear equation of state at high baryonic density and compact star
constraints | 26 pages including 2 tables and 7 figures | Nucl.Phys.A811:140-157,2008 | 10.1016/j.nuclphysa.2008.07.009 | null | nucl-th astro-ph hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mean field calculation is carried out to obtain the equation of state (EoS)
of nuclear matter from a density dependent M3Y interaction (DDM3Y). The energy
per nucleon is minimized to obtain ground state of the symmetric nuclear matter
(SNM). The constants of density dependence of the effective interaction are
obtained by reproducing the saturation energy per nucleon and the saturation
density of SNM. The energy variation of the exchange potential is treated
properly in the negative energy domain of nuclear matter. The EoS of SNM, thus
obtained, is not only free from the superluminosity problem but also provides
excellent estimate of nuclear incompressibility. The EoS of asymmetric nuclear
matter is calculated by adding to the isoscalar part, the isovector component
of M3Y interaction. The SNM and pure neutron matter EoS are used to calculate
the nuclear symmetry energy which is found to be consistent with that extracted
from the isospin diffusion in heavy-ion collisions at intermediate energies.
The $\beta$ equilibrium proton fraction calculated from the symmetry energy and
related theoretical findings are consistent with the constraints derived from
the observations on compact stars.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:38:21 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jun 2008 14:20:40 GMT"
}
] | 2008-09-04T00:00:00 | [
[
"Basu",
"D. N.",
""
],
[
"Chowdhury",
"P. Roy",
""
],
[
"Samanta",
"C.",
""
]
] |
0707.4621 | Marc Hallin | Marc Hallin, Davy Paindaveine | Semiparametrically efficient rank-based inference for shape I. optimal
rank-based tests for sphericity | Published at http://dx.doi.org/10.1214/009053606000000731 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2707-2756 | 10.1214/009053606000000731 | IMS-AOS-AOS0091 | math.ST stat.TH | null | We propose a class of rank-based procedures for testing that the shape matrix
$\mathbf{V}$ of an elliptical distribution (with unspecified center of
symmetry, scale and radial density) has some fixed value ${\mathbf{V}}_0$; this
includes, for ${\mathbf{V}}_0={\mathbf{I}}_k$, the problem of testing for
sphericity as an important particular case. The proposed tests are invariant
under translations, monotone radial transformations, rotations and reflections
with respect to the estimated center of symmetry. They are valid without any
moment assumption. For adequately chosen scores, they are locally
asymptotically maximin (in the Le Cam sense) at given radial densities. They
are strictly distribution-free when the center of symmetry is specified, and
asymptotically so when it must be estimated. The multivariate ranks used
throughout are those of the distances--in the metric associated with the null
value ${\mathbf{V}}_0$ of the shape matrix--between the observations and the
(estimated) center of the distribution. Local powers (against elliptical
alternatives) and asymptotic relative efficiencies (AREs) are derived with
respect to the adjusted Mauchly test (a modified version of the Gaussian
likelihood ratio procedure proposed by Muirhead and Waternaux [Biometrika 67
(1980) 31--43]) or, equivalently, with respect to (an extension of) the test
for sphericity introduced by John [Biometrika 58 (1971) 169--174]. For Gaussian
scores, these AREs are uniformly larger than one, irrespective of the actual
radial density. Necessary and/or sufficient conditions for consistency under
nonlocal, possibly nonelliptical alternatives are given. Finite sample
performances are investigated via a Monte Carlo study.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:06:48 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Hallin",
"Marc",
""
],
[
"Paindaveine",
"Davy",
""
]
] |
0707.4622 | Bjoern Trauzettel | B. Trauzettel, M. Borhani, M. Trif, D. Loss | Theory of spin qubits in nanostructures | 18 pages, 8 figures, submitted to JPSJ Special Topics: Advances in
Spintronics | J. Phys. Soc. Jpn. 77, 031012 (2008) | 10.1143/JPSJ.77.031012 | null | cond-mat.mes-hall | null | We review recent advances on the theory of spin qubits in nanostructures. We
focus on four selected topics. First, we show how to form spin qubits in the
new and promising material graphene. Afterwards, we discuss spin relaxation and
decoherence in quantum dots. In particular, we demonstrate how charge
fluctations in the surrounding environment cause spin decay via spin--orbit
coupling. We then turn to a brief overview of how one can use electron-dipole
spin resonance (EDSR) to perform single spin rotations in quantum dots using an
oscillating electric field. The final topic we cover is the spin-spin coupling
via spin-orbit interaction which is an alternative to the usual spin-spin
coupling via the Heisenberg exchange interaction.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:08:50 GMT"
}
] | 2008-08-29T00:00:00 | [
[
"Trauzettel",
"B.",
""
],
[
"Borhani",
"M.",
""
],
[
"Trif",
"M.",
""
],
[
"Loss",
"D.",
""
]
] |
0707.4623 | Tommaso Spadaro | The KLOE Collaboration | Preliminary measurement of Gamma(Ke2)/Gamma(Km2) at KLOE | 11 pages, 5 figures. Contributed paper for the XXIII International
Symposium on Lepton and Photon Interactions at High Energy, Lepton-Photon
2007, Aug 13-18 Daegu, Korea | PoSKAON:050,2008 | null | null | hep-ex | null | A preliminary measurement of RK = Gamma(Ke2)/Gamma(Km2) at the KLOE
experiment is discussed. The result, RK = (2.55+-0.05+-0.05)x 10^-5, is based
on 1.7 fb^-1 of luminosity integrated on the phi-meson peak at the Frascati
e^+e^- collider DAFNE, corresponding to ~8000 observed Ke2 events. Perspectives
on the methods planned to improve both the statistical and the systematic
errors are briefly outlined.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:21:36 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"The KLOE Collaboration",
"",
""
]
] |
0707.4624 | Eric C. Hannah | Eric C. Hannah, Michael A. Brown | Conceptual Design of a Micron-Scale Atomic Clock | Submitted to the Journal of Applied Physics | null | null | null | physics.atom-ph physics.ins-det | null | A theoretical proposal for reducing an entire atomic clock to micron
dimensions. A phosphorus or nitrogen atom is introduced into a fullerene cage.
This endohedral fullerene is then coated with an insulating shell and a number
of them are deposited as a thin layer on a silicon chip. Next to this layer a
GMR sensor is fabricated which is close to the endohedral fullerenes. This GMR
sensor measures oscillating magnetic fields on the order of micro-gauss from
the nuclear spins varying at the frequency of the hyperfine transition (413 MHz
frequency). Given the micron scale and simplicity of this system only a few
transistors are needed to control the waveforms and to perform digital
clocking. This new form of atomic clock exhibits extremely low power (nano
watts), high vibration and shock resistance, stability on the order of 10^{-9},
and is compatible with MEMS fabrication and chip integration. As GMR sensors
continue to improve in sensitivity the stability of this form of atomic clock
will increase proportionately.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 17:34:57 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Hannah",
"Eric C.",
""
],
[
"Brown",
"Michael A.",
""
]
] |
0707.4625 | Dr. Bikash Chandra Paul | B. C. Paul, P. Thakur and A. Saha | Holographic Dark Energy Model with Modified Generalized Chaplygin Gas | 15 Pages, 1 figure | null | null | null | gr-qc | null | We present a holographic dark energy model of the universe considering
modified generalized Chaplygin gas (GCG). The modified GCG behaves as an
ordinary barotropic fluid in the early epoch when the universe was tiny but
behaves subsequently as a $\Lambda$CDM model at late epoch. An equivalent model
with scalar field is obtained here by constructing the corresponding potential.
The holographic dark energy is identified with the modified GCG and we
determine the corresponding holographic dark energy field and its potential.
The stability of the holographic dark energy in this case is also discussed.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:21:37 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Nov 2007 09:09:47 GMT"
}
] | 2007-11-21T00:00:00 | [
[
"Paul",
"B. C.",
""
],
[
"Thakur",
"P.",
""
],
[
"Saha",
"A.",
""
]
] |
0707.4626 | Takanori Sakamoto | T. Sakamoto, S. D. Barthelmy, L. Barbier, J. R. Cummings, E. E.
Fenimore, N. Gehrels, D. Hullinger, H. A. Krimm, C. B. Markwardt, D. M.
Palmer, A. M. Parsons, G. Sato, M. Stamatikos, J. Tueller, T. N. Ukwatta, B.
Zhang | The First Swift BAT Gamma-Ray Burst Catalog | 63 pages, 23 figures, Accepted in ApJS, Corrected for the BAT ground
position, the image significance, and the error radius of GRB 051105, Five
machine-readable tables are available at
http://swift.gsfc.nasa.gov/docs/swift/results/bat1_catalog/ | null | 10.1086/523646 | null | astro-ph | null | We present the first Swift Burst Alert Telescope (BAT) catalog of gamma-ray
bursts (GRBs), which contains bursts detected by the BAT between 2004 December
19 and 2007 June 16. This catalog (hereafter BAT1 catalog) contains burst
trigger time, location, 90% error radius, duration, fluence, peak flux, and
time averaged spectral parameters for each of 237 GRBs, as measured by the BAT.
The BAT-determined position reported here is within 1.75' of the Swift X-ray
Telescope (XRT)-determined position for 90% of these GRBs. The BAT T_90 and
T_50 durations peak at 80 and 20 seconds, respectively. From the
fluence-fluence correlation, we conclude that about 60% of the observed peak
energies, Epeak, of BAT GRBs could be less than 100 keV. We confirm that GRB
fluence to hardness and GRB peak flux to hardness are correlated for BAT bursts
in analogous ways to previous missions' results. The correlation between the
photon index in a simple power-law model and Epeak is also confirmed. We also
report the current status for the on-orbit BAT calibrations based on
observations of the Crab Nebula.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:23:32 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 13:58:31 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Sep 2007 16:03:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sakamoto",
"T.",
""
],
[
"Barthelmy",
"S. D.",
""
],
[
"Barbier",
"L.",
""
],
[
"Cummings",
"J. R.",
""
],
[
"Fenimore",
"E. E.",
""
],
[
"Gehrels",
"N.",
""
],
[
"Hullinger",
"D.",
""
],
[
"Krimm",
"H. A.",
""
],
[
"Markwardt",
"C. B.",
""
],
[
"Palmer",
"D. M.",
""
],
[
"Parsons",
"A. M.",
""
],
[
"Sato",
"G.",
""
],
[
"Stamatikos",
"M.",
""
],
[
"Tueller",
"J.",
""
],
[
"Ukwatta",
"T. N.",
""
],
[
"Zhang",
"B.",
""
]
] |
0707.4627 | Jurgen Knodlseder | J\"urgen Kn\"odlseder (CESR), Peter Von Ballmoos (CESR), Filippo
Frontera (UNIFE), Angela Bazzano, Finn E. Christensen (DNSC), Margarida
Hernanz (CSIC-IEEC), Cornelia Wunderer (SSL) | GRI: focusing on the evolving violent Universe | 11 pages, to be pubslihed in the SPIE proceedings | Exper.Astron.23:121-138,2009 | 10.1007/s10686-008-9119-4 | null | astro-ph | null | The Gamma-Ray Imager (GRI) is a novel mission concept that will provide an
unprecedented sensitivity leap in the soft gamma-ray domain by using for the
first time a focusing lens built of Laue diffracting crystals. The lens will
cover an energy band from 200 - 1300 keV with an effective area reaching 600
cm2. It will be complemented by a single reflection multilayer coated mirror,
extending the GRI energy band into the hard X-ray regime, down to ~10 keV. The
concentrated photons will be collected by a position sensitive pixelised CZT
stack detector. We estimate continuum sensitivities of better than 10^-7
ph/cm2/s/keV for a 100 ks exposure; the narrow line sensitivity will be better
than 3 x 10^-6 ph/cm2/s for the same integration time. As focusing instrument,
GRI will have an angular resolution of better than 30 arcsec within a field of
view of roughly 5 arcmin - an unprecedented achievement in the gamma-ray
domain. Owing to the large focal length of 100 m of the lens and the mirror,
the optics and detector will be placed on two separate spacecrafts flying in
formation in a high elliptical orbit. R&D work to enable the lens focusing
technology and to develop the required focal plane detector is currently
underway, financed by ASI, CNES, ESA, and the Spanish Ministery of Education
and Science. The GRI mission is proposed as class M mission for ESA's Cosmic
Vision 2015-2025 program. GRI will allow studies of particle acceleration
processes and explosion physics in unprecedented detail, providing essential
clues on the innermost nature of the most violent and most energetic processes
in the Universe.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:27:37 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Knödlseder",
"Jürgen",
"",
"CESR"
],
[
"Von Ballmoos",
"Peter",
"",
"CESR"
],
[
"Frontera",
"Filippo",
"",
"UNIFE"
],
[
"Bazzano",
"Angela",
"",
"DNSC"
],
[
"Christensen",
"Finn E.",
"",
"DNSC"
],
[
"Hernanz",
"Margarida",
"",
"CSIC-IEEC"
],
[
"Wunderer",
"Cornelia",
"",
"SSL"
]
] |
0707.4628 | Sergi Elizalde | Jos\'e M. Amig\'o, Sergi Elizalde, Matthew B. Kennel | Forbidden patterns and shift systems | 21 pages, expanded Section 5 and corrected Propositions 3 and 4 | null | null | null | math.DS math.CO | null | The scope of this paper is two-fold. First, to present to the researchers in
combinatorics an interesting implementation of permutations avoiding
generalized patterns in the framework of discrete-time dynamical systems.
Indeed, the orbits generated by piecewise monotone maps on one-dimensional
intervals have forbidden order patterns, i.e., order patterns that do not occur
in any orbit. The allowed patterns are then those patterns avoiding the
so-called forbidden root patterns and their shifted patterns. The second scope
is to study forbidden patterns in shift systems, which are universal models in
information theory, dynamical systems and stochastic processes. Due to its
simple structure, shift systems are accessible to a more detailed analysis and,
at the same time, exhibit all important properties of low-dimensional chaotic
dynamical systems (e.g., sensitivity to initial conditions, strong mixing and a
dense set of periodic points), allowing to export the results to other
dynamical systems via order-isomorphisms.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:35:28 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 21:25:32 GMT"
}
] | 2007-09-05T00:00:00 | [
[
"Amigó",
"José M.",
""
],
[
"Elizalde",
"Sergi",
""
],
[
"Kennel",
"Matthew B.",
""
]
] |
0707.4629 | Robert Selkowitz | Robert I Selkowitz, Eric G. Blackman | On the role of stochastic Fermi acceleration in setting the dissipation
scale of turbulence in the interstellar medium | 12 Pages, no figures. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12259.x | null | astro-ph | null | We consider the dissipation by Fermi acceleration of magnetosonic turbulence
in the Reynolds Layer of the interstellar medium. The scale in the cascade at
which electron acceleration via stochastic Fermi acceleration (STFA) becomes
comparable to further cascade of the turbulence defines the inner scale. For
any magnetic turbulent spectra equal to or shallower than Goldreich-Sridhar
this turns out to be $\ge 10^{12}$cm, which is much larger than the shortest
length scales observed in radio scintillation measurements. While STFA for such
spectra then contradict models of scintillation which appeal directly to an
extended, continuous turbulent cascade, such a separation of scales is
consistent with the recent work of \citet{Boldyrev2} and \citet{Boldyrev3}
suggesting that interstellar scintillation may result from the passage of radio
waves through the galactic distribution of thin ionized boundary surfaces of
HII regions, rather than density variations from cascading turbulence. The
presence of STFA dissipation also provides a mechanism for the non-ionizing
heat source observed in the Reynolds Layer of the interstellar medium
\citep{Reynolds}. STFA accommodates the proper heating power, and the input
energy is rapidly thermalized within the low density Reynolds layer plasma.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 14:39:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Selkowitz",
"Robert I",
""
],
[
"Blackman",
"Eric G.",
""
]
] |
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