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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.0049 | Anthony Grbic | A. Grbic and R. Merlin | Near-Field Focusing Plates and Their Design | 11 pages, 6 figures, 1 table | null | 10.1109/TAP.2008.929436 | null | physics.class-ph | null | This paper describes the design of near-field focusing plates, which are
grating-like structures that can focus electromagnetic radiation to spots or
lines of arbitrarily small subwavelength dimension. A general procedure is
outlined for designing a near-field plate given a desired image, and its
implementation at microwave frequencies is discussed. Full-wave (method of
moments) simulations clearly demonstrate the near-field plate's ability to
overcome the diffraction limit. Finally, it is shown that the performance of
near-field plates is weakly affected by losses.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:29:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Grbic",
"A.",
""
],
[
"Merlin",
"R.",
""
]
] |
0708.0050 | Daniel Walker | The BABAR Collaboration: B. Aubert, et al | Evidence for charged B meson decays to a1(1260)+/- pi0 and a1(1260)0
pi+/- | 7 pages, 2 postscript figures; version published in Phys. Rev. Lett.,
minor typographical changes from version 2 | Phys.Rev.Lett.99:261801,2007 | 10.1103/PhysRevLett.99.261801 | BABAR-PUB-07/034, SLAC-PUB-12699 | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present measurements of the branching fractions for the decays B+/- -->
a1(1260)+/- pi0 and B+/- --> a1(1260)0 pi+/- from a data sample of 232 * 10^6
BB pairs produced in e+e- annihilation through the Y(4S) resonance. We measure
the branching fraction B(B+/- --> a1(1260)+/- pi0) * B(a1(1260)+/- --> pi- pi+
pi+/-) = (13.2 +/- 2.7 +/- 2.1) * 10^-6 with a significance of 4.2 sigma, and
the branching fraction B(B+/- --> a1(1260)0 pi+/-) * B(a1(1260)0 --> pi- pi+
pi0) = (20.4 +/- 4.7 +/- 3.4) * 10^-6 with a significance of 3.8 sigma, where
the first error quoted is statistical and the second is systematic.
| [
{
"version": "v1",
"created": "Tue, 31 Jul 2007 23:51:33 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 15:30:59 GMT"
},
{
"version": "v3",
"created": "Fri, 25 Jul 2008 22:57:44 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.0051 | Daniel Robb | D. T. Robb, Y. H. Xu, O. Hellwig, J. McCord, A. Berger, M. A. Novotny,
and P. A. Rikvold | Evidence for a dynamic phase transition in [Co/Pt]_3 magnetic
multilayers | substantial revision; 26 pages, 9 figures; to appear in Phys. Rev. B | null | 10.1103/PhysRevB.78.134422 | null | cond-mat.stat-mech cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A dynamic phase transition (DPT) with respect to the period P of an applied
alternating magnetic field has been observed previously in numerical
simulations of magnetic systems. However, experimental evidence for this DPT
has thus far been limited to qualitative observations of hysteresis loop
collapse in studies of hysteresis loop area scaling. Here, we present
significantly stronger evidence for the experimental observation of this DPT,
in a [Co(4 A)/Pt(7 A)]_3-multilayer system with strong perpendicular
anisotropy. We applied an out-of-plane, time-varying (sawtooth) field to the
[Co/Pt]_3 multilayer, in the presence of a small additional constant field,
H_b. We then measured the resulting out-of-plane magnetization time series to
produce nonequilibrium phase diagrams (NEPDs) of the cycle-averaged
magnetization, Q, and its variance, Var(Q), as functions of P and H_b. The
experimental NEPDs are found to strongly resemble those calculated from
simulations of a kinetic Ising model under analagous conditions. The similarity
of the experimental and simulated NEPDs, in particular the presence of a
localized peak in the variance Var(Q) in the experimental results, constitutes
strong evidence for the presence of this DPT in our magnetic multilayer
samples. Technical challenges related to the hysteretic nature and response
time of the electromagnet used to generate the time-varying applied field
precluded us from extracting meaningful critical scaling exponents from the
current data. However, based on our results, we propose refinements to the
experimental procedure which could potentially enable the determination of
critical exponents in the future.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 00:30:46 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Oct 2008 20:44:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Robb",
"D. T.",
""
],
[
"Xu",
"Y. H.",
""
],
[
"Hellwig",
"O.",
""
],
[
"McCord",
"J.",
""
],
[
"Berger",
"A.",
""
],
[
"Novotny",
"M. A.",
""
],
[
"Rikvold",
"P. A.",
""
]
] |
0708.0052 | Maurizio De Sanctis | M. De Sanctis | An Introduction to Relativistic Quantum Mechanics. I. From Relativity to
Dirac Equation | 53 pages. Didactical work. Revised conceptual argument about speed of
light in section 2.1. Results unchanged | null | null | null | physics.gen-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the general concepts of special relativity and the requirements of
quantum mechanics, Dirac equation is derived and studied. Only elementary
knowledge of spin and rotations in quantum mechanics and standard handlings of
linear algebra are employed for the development of the present work.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 00:53:16 GMT"
},
{
"version": "v2",
"created": "Fri, 23 Sep 2011 20:37:05 GMT"
},
{
"version": "v3",
"created": "Fri, 30 Sep 2011 03:56:07 GMT"
}
] | 2011-10-03T00:00:00 | [
[
"De Sanctis",
"M.",
""
]
] |
0708.0053 | Dragomir Z. Djokovic | Dragomir Z. Djokovic | Periodic complementary sets of binary sequences | 10 pages, 1 table. Substantial revision and simplification. Submitted
to IEEE Trans. Inform. Theory | International Mathematical Forum 4 (2009), no. 15, 717-725. | null | null | cs.IT math.CO math.IT | null | Let PCS_p^N denote a set of p binary sequences of length N such that the sum
of their periodic auto-correlation functions is a delta-function. In the 1990,
Boemer and Antweiler addressed the problem of constructing such sequences. They
presented a table covering the range p <= 12, N <= 50 and showing in which
cases it was known at that time whether such sequences exist, do not exist, or
the question of existence is undecided. The number of undecided cases was
rather large.
Subsequently the number of undecided cases was reduced to 26 by the author.
In the present note, several cyclic difference families are constructed and
used to obtain new sets of periodic binary sequences. Thereby the original
problem of Boemer and Antweiler is completely solved.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 00:40:12 GMT"
},
{
"version": "v2",
"created": "Sun, 13 Apr 2008 16:20:25 GMT"
}
] | 2009-09-01T00:00:00 | [
[
"Djokovic",
"Dragomir Z.",
""
]
] |
0708.0054 | Douglas Galvao | Bruno V. C. Martins, Gustavo Brunetto, Fernando Sato, Vitor R. Coluci,
and Douglas S. Galvao | Designing Conducting Polymers Using Bioinspired Ant Algorithms | null | null | 10.1016/j.cplett.2008.01.037 | null | cond-mat.mtrl-sci cond-mat.soft | null | Ant algorithms are inspired in real ants and the main idea is to create
virtual ants that travel into the space of possible solution depositing virtual
pheromone proportional to how good a specific solution is. This creates a
autocatalytic (positive feedback) process that can be used to generate
automatic solutions to very difficult problems. In the present work we show
that these algorithms can be used coupled to tight-binding hamiltonians to
design conducting polymers with pre-specified properties. The methodology is
completely general and can be used for a large number of optimization problems
in materials science.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 00:43:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Martins",
"Bruno V. C.",
""
],
[
"Brunetto",
"Gustavo",
""
],
[
"Sato",
"Fernando",
""
],
[
"Coluci",
"Vitor R.",
""
],
[
"Galvao",
"Douglas S.",
""
]
] |
0708.0055 | Han Ju Lee | Han Ju Lee | Banach spaces with polynomial numerical index 1 | null | null | 10.1112/blms/bdm113 | null | math.FA | null | We characterize Banach spaces with polynomial numerical index 1 when they
have the Radon-Nikod\'ym property. The holomorphic numerical index is
introduced and the characterization of the Banach space with holomorphic
numerical index 1 is obtained when it has the Radon-Nikod\'ym property.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 00:54:58 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Lee",
"Han Ju",
""
]
] |
0708.0056 | Alexander Lagutin S. | B.A. Aronzon, M.V. Kovalchuk, E.M. Pashaev, M.A. Chuev, V.V.
Kvardakov, I.A. Subbotin, V.V. Rylkov, M.A. Pankov, A.S. Lagutin, B.N.
Zvonkov, Yu.A. Danilov, O.V. Vihrova, A.V. Lashkul, R. Laiho | Structural and transport properties of
GaAs/delta<Mn>/GaAs/InxGa1-xAs/GaAs quantum wells | 15 pages, 9 figures | null | 10.1088/0953-8984/20/14/145207 | null | cond-mat.mtrl-sci cond-mat.mes-hall | null | We report results of investigations of structural and transport properties of
GaAs/Ga(1-x)In(x)As/GaAs quantum wells (QWs) having a 0.5-1.8 ML thick Mn
layer, separated from the QW by a 3 nm thick spacer. The structure has hole
mobility of about 2000 cm2/(V*s) being by several orders of magnitude higher
than in known ferromagnetic two-dimensional structures. The analysis of the
electro-physical properties of these systems is based on detailed study of
their structure by means of high-resolution X-ray diffractometry and
glancing-incidence reflection, which allow us to restore the depth profiles of
structural characteristics of the QWs and thin Mn containing layers. These
investigations show absence of Mn atoms inside the QWs. The quality of the
structures was also characterized by photoluminescence spectra from the QWs.
Transport properties reveal features inherent to ferromagnetic systems: a
specific maximum in the temperature dependence of the resistance and the
anomalous Hall effect (AHE) observed in samples with both "metallic" and
activated types of conductivity up to ~100 K. AHE is most pronounced in the
temperature range where the resistance maximum is observed, and decreases with
decreasing temperature. The results are discussed in terms of interaction of
2D-holes and magnetic Mn ions in presence of large-scale potential fluctuations
related to random distribution of Mn atoms. The AHE values are compared with
calculations taking into account its "intrinsic" mechanism in ferromagnetic
systems.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 00:57:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aronzon",
"B. A.",
""
],
[
"Kovalchuk",
"M. V.",
""
],
[
"Pashaev",
"E. M.",
""
],
[
"Chuev",
"M. A.",
""
],
[
"Kvardakov",
"V. V.",
""
],
[
"Subbotin",
"I. A.",
""
],
[
"Rylkov",
"V. V.",
""
],
[
"Pankov",
"M. A.",
""
],
[
"Lagutin",
"A. S.",
""
],
[
"Zvonkov",
"B. N.",
""
],
[
"Danilov",
"Yu. A.",
""
],
[
"Vihrova",
"O. V.",
""
],
[
"Lashkul",
"A. V.",
""
],
[
"Laiho",
"R.",
""
]
] |
0708.0057 | Jun'ichi Kotoku | Jun'ichi Kotoku (1), Kazuo Makishima (2 and 3), Yukari Matsumoto (2),
Mitsuhiro Kohama (3), Yukikatsu Terada (3) and Toru Tamagawa (3) ((1)
National Astronomical Observatory of Japan, (2) Department of Physics,
University of Tokyo, (3) RIKEN (Institute of Physical and Chemical research)) | Effects of Compton scattering on the Gamma Ray Spectra of Solar flares | 37 pages, 16 figures, accepted for publication in PASJ | null | 10.1093/pasj/59.6.1161 | null | astro-ph | null | Using fully relativistic GEANT4 simulation tool kit, the transport of
energetic electrons generated in solar flares was Monte-Carlo simulated, and
resultant bremsstrahlung gamma-ray spectra were calculated. The solar
atmosphere was approximated by 10 vertically-stacked zones. The simulation took
into account two important physical processes,that the bremsstrahlung photons
emitted by precipitating relativistic electrons are strongly forward beamed
toward the photosphere, and that the majority of these gamma-rays must be
Compton back-scattered by the solar atmosphere in order to reach the observer.
Then, the Compton degradation was found to make the observable gamma-ray
spectra much softer than is predicted by simple analytic calculations. The
gamma-ray signals were found to be enhanced by several conditions, including a
broad pitch-angle distribution of the electrons, a near-limb flare longitude,
and a significant tilt in the magnetic field lines if the flare longitude is
rather small. These results successfully explain several important flare
properties observed in the hard X-ray to gamma-ray range, including in
particular those obtained with Yohkoh. A comparison of the Yohkoh spectrum from
a GOES X3.7 class limb flare on 1998 November 22, with a simulation assuming a
broad electron pitch-angle distribution, suggests that gamma-rays from this
particular solar flare were a mixture of direct bremsstrahlung photons and
their Comptonization.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 01:33:25 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kotoku",
"Jun'ichi",
"",
"2 and 3"
],
[
"Makishima",
"Kazuo",
"",
"2 and 3"
],
[
"Matsumoto",
"Yukari",
""
],
[
"Kohama",
"Mitsuhiro",
""
],
[
"Terada",
"Yukikatsu",
""
],
[
"Tamagawa",
"Toru",
""
]
] |
0708.0058 | Brian Rodriguez | B. J. Rodriguez, S. Jesse, K. Seal, A. P. Baddorf, and S. V. Kalinin | Direct Measurement of Periodic Electric Forces in Liquids | null | J. Appl. Phys. 103, 014306 (2008) | 10.1063/1.2817477 | null | cond-mat.mtrl-sci | null | The electric forces acting on an atomic force microscope tip in solution have
been measured using a microelectrochemical cell formed by two periodically
biased electrodes. The forces were measured as a function of lift height and
bias amplitude and frequency, providing insight into electrostatic interactions
in liquids. Real-space mapping of the vertical and lateral components of
electrostatic forces acting on the tip from the deflection and torsion of the
cantilever is demonstrated. This method enables direct probing of electrostatic
and convective forces involved in electrophoretic and dielectroforetic
self-assembly and electrical tweezer operation in liquid environments.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 01:48:09 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Rodriguez",
"B. J.",
""
],
[
"Jesse",
"S.",
""
],
[
"Seal",
"K.",
""
],
[
"Baddorf",
"A. P.",
""
],
[
"Kalinin",
"S. V.",
""
]
] |
0708.0059 | Sergio Rojas | S. Rojas | On the need to enhance physical insight via mathematical skills | null | null | null | null | physics.ed-ph | null | It is becoming common to hear teaching advice about spending more time on the
"physics of the problem" so that students will get more physical insight and
develop a stronger intuition that can be very helpful when thinking about
physics problems. Based on this type of justification, mathematical skills such
as the ability to compute moments of inertia, center of mass, or gravitational
fields from mass distributions, and electrical fields from charge distributions
are considered "distracting mathematics" and therefore receive less attention.
We argue a) that this approach can have a negative influence on student
reasoning when dealing with questions of rotational dynamics, a highly
non-intuitive subject where even instructors may fail to provide correct
answers, and b) that exposure of students to mathematical reasoning and to a
wide range of computational techniques to obtain the moment of inertia of
different mass distributions will make students more comfortable with the
subject of rotational dynamics, thus improving their physical insight on the
topic.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 02:49:27 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Rojas",
"S.",
""
]
] |
0708.0060 | Xiang-Dong Li | Xiang-Dong Li | The Nature of the Compact X-ray Source in Supernova Remnant RCW 103 | 12 pages, 1 figure, accepted to ApJL | null | 10.1086/521791 | null | astro-ph | null | The discovery of the 6.67 hr periodicity in the X-ray source 1E 161348-5055
associated with the supernova remnant RCW 103 has raised interesting
suggestions about the nature of the X-ray source. Here we argue that in either
accreting neutron star or magnetar model, a supernova fallback disk may be a
critical ingredient in theoretical interpretations of 1E 161348-5055. We
further emphasize the effect of fallback disks on the evolution of young
compact objects in various ways, and suggest that even SS 433 could also be
powered by fallback disk accretion process.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 03:04:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Li",
"Xiang-Dong",
""
]
] |
0708.0061 | Heng Lian | Heng Lian | Cross Validation for Comparing Multiple Density Estimation Procedures | null | Statistics & Probability Letters 79(1):112-115:2009 | null | null | math.ST stat.TH | null | We demonstrate the consistency of cross validation for comparing multiple
density estimators using simple inequalities on the likelihood ratio. In
nonparametric problems, the splitting of data does not require the domination
of test data over the training/estimation data, contrary to Shao (1993). The
result is complementary to that of Yang (2005) and Yang (2006).
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 03:26:20 GMT"
}
] | 2008-12-17T00:00:00 | [
[
"Lian",
"Heng",
""
]
] |
0708.0062 | Achim Kempf | Achim Kempf, Robert Martin | On Information Theory, Spectral Geometry and Quantum Gravity | 4 pages | Phys.Rev.Lett.100:021304,2008 | 10.1103/PhysRevLett.100.021304 | null | gr-qc | null | We show that there exists a deep link between the two disciplines of
information theory and spectral geometry. This allows us to obtain new results
on a well known quantum gravity motivated natural ultraviolet cutoff which
describes an upper bound on the spatial density of information. Concretely, we
show that, together with an infrared cutoff, this natural ultraviolet cutoff
beautifully reduces the path integral of quantum field theory on curved space
to a finite number of ordinary integrations. We then show, in particular, that
the subsequent removal of the infrared cutoff is safe.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 04:24:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kempf",
"Achim",
""
],
[
"Martin",
"Robert",
""
]
] |
0708.0063 | Jae-Suk Yang | Okyu Kwon, Jae-Suk Yang | Information flow between composite stock index and individual stocks | 8 pages, 4 figures | null | 10.1016/j.physa.2008.01.007 | null | q-fin.ST physics.soc-ph | null | We investigate the strength and the direction of information transfer in the
U.S. stock market between the composite stock price index of stock market and
prices of individual stocks using the transfer entropy. Through the
directionality of the information transfer, we find that individual stocks are
influenced by the index of the market.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 03:43:27 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Kwon",
"Okyu",
""
],
[
"Yang",
"Jae-Suk",
""
]
] |
0708.0064 | Brian Wilhite | B. C. Wilhite, R. J. Brunner, D. P. Schneider, D. E. Vanden Berk | The Effect of Variability on the Estimation of Quasar Black Hole Masses | 76 pages, 15 figures, 2 (long) tables; Accepted for publication in
ApJ (November 10, 2007) | Astrophys.J.669:791-800,2007 | 10.1086/521713 | null | astro-ph | null | We investigate the time-dependent variations of ultraviolet (UV) black hole
mass estimates of quasars in the Sloan Digital Sky Survey (SDSS). From SDSS
spectra of 615 high-redshift (1.69 < z < 4.75) quasars with spectra from two
epochs, we estimate black hole masses, using a single-epoch technique which
employs an additional, automated night-sky-line removal, and relies on UV
continuum luminosity and CIV (1549A) emission line dispersion. Mass estimates
show variations between epochs at about the 30% level for the sample as a
whole. We determine that, for our full sample, measurement error in the line
dispersion likely plays a larger role than the inherent variability, in terms
of contributing to variations in mass estimates between epochs. However, we use
the variations in quasars with r-band spectral signal-to-noise ratio greater
than 15 to estimate that the contribution to these variations from inherent
variability is roughly 20%. We conclude that these differences in black hole
mass estimates between epochs indicate variability is not a large contributer
to the current factor of two scatter between mass estimates derived from low-
and high-ionization emission lines.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 03:55:18 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Wilhite",
"B. C.",
""
],
[
"Brunner",
"R. J.",
""
],
[
"Schneider",
"D. P.",
""
],
[
"Berk",
"D. E. Vanden",
""
]
] |
0708.0065 | Yu-Xiao Liu | Yu-Xiao Liu, Xin-Hui Zhang, Li-Da Zhang, Yi-Shi Duan | Localization of Matters on Pure Geometrical Thick Branes | 17 pages, 5 figures, accepted by JHEP | JHEP 0802:067,2008 | 10.1088/1126-6708/2008/02/067 | null | hep-th | null | In the literatures, several types of thick smooth brane configurations in a
pure geometric Weyl integrable 5-dimensional space time have been presented.
The Weyl geometry is a non-Riemannian modification of 5-dimensional
Kaluza--Klein (KK) theory. All these thick brane solutions preserve
4-dimensional Poincar\'e invariance, and some of them break $Z_2$--symmetry
along the extra dimension. In this paper, we study localization of various
matter fields on these pure geometrical thick branes, which also localize the
graviton. We present the shape of the potential of the corresponding
Schr$\mathrm{\ddot{o}}$dinger problem and obtain the lowest KK mode. It is
showed that, for both spin 0 scalars and spin 1 vectors, there exists a
continuum gapless spectrum of KK states with $m^2>0$. But only the massless
mode of scalars is found to be normalizable on the brane. However, for the
massless left or right chiral fermion localization, there must be some kind of
Yukawa coupling. For a special coupling, there exist a series of discrete
massive KK modes with $m^2 >0$. It is also showed that for a given coupling
constant only one of the massless chiral modes is localized on the branes.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 04:27:59 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Aug 2007 04:24:59 GMT"
},
{
"version": "v3",
"created": "Sun, 14 Oct 2007 14:13:41 GMT"
},
{
"version": "v4",
"created": "Tue, 4 Dec 2007 06:33:21 GMT"
},
{
"version": "v5",
"created": "Sat, 15 Dec 2007 11:55:50 GMT"
},
{
"version": "v6",
"created": "Mon, 21 Jan 2008 08:49:41 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Liu",
"Yu-Xiao",
""
],
[
"Zhang",
"Xin-Hui",
""
],
[
"Zhang",
"Li-Da",
""
],
[
"Duan",
"Yi-Shi",
""
]
] |
0708.0066 | Ryo Nikkuni | Ryo Nikkuni, Kouki Taniyama | Symmetries of spatial graphs and Simon invariants | 16 pages, 14 figures | Fund. Math. 205 (2009), 219--236 | 10.4064/fm205-3-2 | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An ordered and oriented 2-component link L in the 3-sphere is said to be
achiral if it is ambient isotopic to its mirror image ignoring the orientation
and ordering of the components. Kirk-Livingston showed that if L is achiral
then the linking number of L is not congruent to 2 modulo 4. In this paper we
study orientation-preserving or reversing symmetries of 2-component links,
spatial complete graphs on 5 vertices and spatial complete bipartite graphs on
3+3 vertices in detail, and determine the necessary conditions on linking
numbers and Simon invariants for such links and spatial graphs to be symmetric.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 04:44:09 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Sep 2009 14:35:12 GMT"
},
{
"version": "v3",
"created": "Wed, 14 Oct 2009 14:16:42 GMT"
}
] | 2020-05-19T00:00:00 | [
[
"Nikkuni",
"Ryo",
""
],
[
"Taniyama",
"Kouki",
""
]
] |
0708.0067 | Utkir Rozikov A | N. N. Ganikhodjaev, U. A. Rozikov | Pirogov-Sinai Theory With New Contours for Symmetric Models | 9 pages | null | null | null | math-ph math.MP | null | The contour argument was introduced by Peierls for two dimensional Ising
model. Peierls benefited from the particular symmetries of the Ising model. For
non-symmetric models the argument was developed by Pirogov and Sinai. It is
very general and rather difficult. Intuitively clear that the Peierls argument
does work for any symmetric model. But contours defined in Pirogov-Sinai theory
do not work if one wants to use Peierls argument for more general symmetric
models. We give a new definition of contour which allows relatively easier
prove the main result of the Pirogov-Sinai theory for symmetric models. Namely,
our contours allow us to apply the classical Peierls argument (with contour
removal operation).
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 04:53:48 GMT"
},
{
"version": "v2",
"created": "Thu, 1 Nov 2007 10:06:39 GMT"
}
] | 2007-11-01T00:00:00 | [
[
"Ganikhodjaev",
"N. N.",
""
],
[
"Rozikov",
"U. A.",
""
]
] |
0708.0068 | Fu-Guo Deng | Xi-Han Li, Fu-Guo Deng, and Hong-Yu Zhou | Faithful qubit transmission against collective noise without ancillary
qubits | 3 pages, 1 figure | Appl. Phys. Lett. 91, 144101 (2007) | 10.1063/1.2794433 | null | quant-ph | null | We present a faithful qubit transmission scheme with linear optics against
collective noise, not resorting to ancillary qubits. Its set-up is composed of
three unbalanced polarization interferometers, based on a polarizing beam
splitter, a beam splitter and a half-wave plate, which makes this scheme more
feasible than others with present technology. The fidelity of successful
transmission is 1, independent of the parameters of the collective noise, and
the success probability for obtaining an uncorrupted state can be improved to
100% with some time delayers. Moreover, this scheme has some good applications
in one-way quantum communication for rejecting the errors caused by the
collective noise in quantum channel.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:08:55 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Oct 2007 03:04:47 GMT"
}
] | 2007-10-03T00:00:00 | [
[
"Li",
"Xi-Han",
""
],
[
"Deng",
"Fu-Guo",
""
],
[
"Zhou",
"Hong-Yu",
""
]
] |
0708.0069 | Sachindeo Vaidya | A. P. Balachandran, A. Pinzul, B. A. Qureshi and S. Vaidya | Twisted Gauge and Gravity Theories on the Groenewold-Moyal Plane | 17 pages, LaTeX, 1 figure | Phys.Rev.D76:105025,2007 | 10.1103/PhysRevD.76.105025 | SU-4252-859, IISc/CHEP/11/07 | hep-th gr-qc hep-ph math-ph math.MP math.QA | null | Recent work [hep-th/0504183,hep-th/0508002] indicates an approach to the
formulation of diffeomorphism invariant quantum field theories (qft's) on the
Groenewold-Moyal (GM) plane. In this approach to the qft's, statistics gets
twisted and the S-matrix in the non-gauge qft's becomes independent of the
noncommutativity parameter theta^{\mu\nu}. Here we show that the noncommutative
algebra has a commutative spacetime algebra as a substructure: the Poincare,
diffeomorphism and gauge groups are based on this algebra in the twisted
approach as is known already from the earlier work of [hep-th/0510059]. It is
natural to base covariant derivatives for gauge and gravity fields as well on
this algebra. Such an approach will in particular introduce no additional gauge
fields as compared to the commutative case and also enable us to treat any
gauge group (and not just U(N)). Then classical gravity and gauge sectors are
the same as those for \theta^{\mu \nu}=0, but their interactions with matter
fields are sensitive to theta^{\mu \nu}. We construct quantum noncommutative
gauge theories (for arbitrary gauge groups) by requiring consistency of twisted
statistics and gauge invariance. In a subsequent paper (whose results are
summarized here), the locality and Lorentz invariance properties of the
S-matrices of these theories will be analyzed, and new non-trivial effects
coming from noncommutativity will be elaborated.
This paper contains further developments of [hep-th/0608138] and a new
formulation based on its approach.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:22:55 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 04:15:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Balachandran",
"A. P.",
""
],
[
"Pinzul",
"A.",
""
],
[
"Qureshi",
"B. A.",
""
],
[
"Vaidya",
"S.",
""
]
] |
0708.0070 | Roderich Tumulka | Roderich Tumulka | Bohmian Mechanics at Space-Time Singularities. I. Timelike Singularities | 26 pages LaTeX, 2 figures (no separate figure files); v2 major
revision | Journal of Geometry and Physics 145: 103478 (2019) | 10.1016/j.geomphys.2019.103478 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop an extension of Bohmian mechanics to a curved background
space-time containing a singularity. The present paper focuses on timelike
singularities. We use the naked timelike singularity of the super-critical
Reissner-Nordstrom geometry as an example. While one could impose boundary
conditions at the singularity that would prevent the particles from falling
into the singularity, we are interested here in the case in which particles
have positive probability to hit the singularity and get annihilated. The wish
for reversibility, equivariance, and the Markov property then dictates that
particles must also be created by the singularity, and indeed dictates the rate
at which this must occur. That is, a stochastic law prescribes what comes out
of the singularity. We specify explicit equations of a non-rigorous model
involving an interior-boundary condition on the wave function at the
singularity, which can be used also in other versions of quantum theory besides
Bohmian mechanics. As the resulting theory involves particle creation and
annihilation, it can be regarded as a quantum field theory, and the stochastic
process for the Bohmian particles is analogous to Bell-type quantum field
theories.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:24:55 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Dec 2018 14:56:34 GMT"
}
] | 2019-08-01T00:00:00 | [
[
"Tumulka",
"Roderich",
""
]
] |
0708.0071 | Fu-Guo Deng | Yu-Jie Liang, Yan-Song Li, Fu-Guo Deng, Xi-Han Li, Bao-An Bian,
Feng-Shou Zhang, Zu-Hua Liu, and Hong-Yu Zhou | Coulomb effects on the formation of proton halo nuclei | 9 pages, 6 figures. One column | Chin.Phys.B18:5267-5271,2009 | 10.1088/1674-1056/18/12/025 | null | nucl-th | null | The exotic structures in the 2s_{1/2} states of five pairs of mirror nuclei
^{17}O-^{17}F, ^{26}Na-^{26}P, ^{27}Mg-^{27}P, ^{28}Al-^{28}P and
^{29}Si-^{29}P are investigated with the relativistic mean-field (RMF) theory
and the single-particle model (SPM) to explore the role of the Coulomb effects
on the proton halo formation. The present RMF calculations show that the exotic
structure of the valence proton is more obvious than that of the valence
neutron of its mirror nucleus, the difference of exotic size between each
mirror nuclei becomes smaller with the increase of mass number A of the mirror
nuclei and the ratios of the valence proton and valence neutron
root-mean-square (RMS) radius to the matter radius in each pair of mirror
nuclei all decrease linearly with the increase of A. In order to interpret
these results, we analyze two opposite effects of Coulomb interaction on the
exotic structure formation with SPM and find that the contribution of the
energy level shift is more important than that of the Coulomb barrier for light
nuclei. However, the hindrance of the Coulomb barrier becomes more obvious with
the increase of A. When A is larger than 34, Coulomb effects on the exotic
structure formation will almost become zero because its two effects counteract
with each other.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:27:17 GMT"
}
] | 2010-01-15T00:00:00 | [
[
"Liang",
"Yu-Jie",
""
],
[
"Li",
"Yan-Song",
""
],
[
"Deng",
"Fu-Guo",
""
],
[
"Li",
"Xi-Han",
""
],
[
"Bian",
"Bao-An",
""
],
[
"Zhang",
"Feng-Shou",
""
],
[
"Liu",
"Zu-Hua",
""
],
[
"Zhou",
"Hong-Yu",
""
]
] |
0708.0072 | Masanori Ichioka | Masanori Ichioka, Kazushige Machida | Vortex states in superconductors with strong Pauli-paramagnetic effect | 7 pages, 5 figures | Phys. Rev. B 76, 064502 (2007) | 10.1103/PhysRevB.76.064502 | null | cond-mat.supr-con | null | Using the quasiclassical theory, we analyze the vortex structure of
strong-paramagnetic superconductors.There, induced paramagnetic moments are
accumulated exclusively around the vortex core. We quantitatively evaluate the
significant paramagnetic effect in the H-dependence of various quantities, such
as low temperature specific heat, Knight shift, magnetization and the flux line
lattice (FLL) form factor. The anomalous H-dependence of the FLL form factor
observed by the small angle neutron scattering in CeCoIn_5 is attributable to
the large paramagnetic contribution.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:27:36 GMT"
}
] | 2013-01-07T00:00:00 | [
[
"Ichioka",
"Masanori",
""
],
[
"Machida",
"Kazushige",
""
]
] |
0708.0073 | Aya Bamba | Aya Bamba (1), Yasushi Fukazawa (2), Junko S. Hiraga (3), John P.
Hughes (4), Hideaki Katagiri (2), Motohide Kokubun (1), Katsuji Koyama (5),
Emi Miyata (6), Tsunefumi Mizuno (2), Koji Mori (7), Hiroshi Nakajima (6),
Masanobu Ozaki (1), Rob Petre (8), Hiromitsu Takahashi (2), Tadayuki
Takahashi (1), Takaaki Tanaka (9), Yukikatsu Terada (3), Yasunobu Uchiyama
(1), Shin Watanabe (1), Hiroya Yamaguchi (5) ((1) ISAS/JAXA, (2) Hiroshima
U., (3) RIKEN, (4) Rutgers U., (5) Kyoto U., (6) Osaka U., (7) Miyazaki U.,
(8) NASA/GSFC. (9) SLAC) | Suzaku wide-band observations of SN 1006 | 16 pages, 8 figures, PASJ, in press | null | 10.1093/pasj/60.sp1.S153 | null | astro-ph | null | We report on the wide band spectra of SN 1006 as observed by Suzaku. Thermal
and nonthermal emission are successfully resolved thanks to the excellent
spectral response of Suzaku's X-ray CCD XIS. The nonthermal emission cannot be
reproduced by a simple power-law model but needs a roll-off at 5.7$\times
10^{16}$ Hz = 0.23 keV. The roll-off frequency is significantly higher in the
northeastern rim than in the southwestern rim. We also have placed the most
stringent upper limit of the flux above 10 keV using the Hard X-ray Detector.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:31:46 GMT"
}
] | 2017-01-18T00:00:00 | [
[
"Bamba",
"Aya",
""
],
[
"Fukazawa",
"Yasushi",
""
],
[
"Hiraga",
"Junko S.",
""
],
[
"Hughes",
"John P.",
""
],
[
"Katagiri",
"Hideaki",
""
],
[
"Kokubun",
"Motohide",
""
],
[
"Koyama",
"Katsuji",
""
],
[
"Miyata",
"Emi",
""
],
[
"Mizuno",
"Tsunefumi",
""
],
[
"Mori",
"Koji",
""
],
[
"Nakajima",
"Hiroshi",
""
],
[
"Ozaki",
"Masanobu",
""
],
[
"Petre",
"Rob",
""
],
[
"Takahashi",
"Hiromitsu",
""
],
[
"Takahashi",
"Tadayuki",
""
],
[
"Tanaka",
"Takaaki",
""
],
[
"Terada",
"Yukikatsu",
""
],
[
"Uchiyama",
"Yasunobu",
""
],
[
"Watanabe",
"Shin",
""
],
[
"Yamaguchi",
"Hiroya",
""
]
] |
0708.0074 | Kazuhide Matsuda | Kazuhide Matsuda | Rational solutions of the Noumi and Yamada system of type $A_4^{(1)}$ | 46 pages, 2 tables;
http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&handle=euclid.pja/1117805147 | J. Math. Phys. 53, 023504 (2012) (35 pages) | 10.1063/1.3681867 | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we completely classify the raional solutions of the Noumi and
Yamada system of type A_4^{(1)}, which is a generalization of the forth
Painlev\'e equation. The rational solutions are classified to three types by
the B\"acklund transformation group.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 05:45:30 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Jun 2009 01:45:33 GMT"
},
{
"version": "v3",
"created": "Mon, 31 Oct 2011 06:02:42 GMT"
},
{
"version": "v4",
"created": "Wed, 9 Nov 2011 06:16:57 GMT"
}
] | 2012-02-10T00:00:00 | [
[
"Matsuda",
"Kazuhide",
""
]
] |
0708.0075 | Seong-Gon Kim | J. Houze, Sungho Kim, Amitava Moitra, B. Jelinek, Sebastien Groh, M.
F. Horstemeyer, Erdem Acar, Masoud Rais-Rohani, and Seong-Gon Kim | A multi-objective optimization procedure to develop
modified-embedded-atom-method potentials: an application to magnesium | 8 pages, 2 figures | null | null | null | cond-mat.mtrl-sci | null | We have developed a multi-objective optimization (MOO) procedure to construct
modified-embedded-atom-method (MEAM) potentials with minimal manual fitting.
This procedure has been applied successfully to develop a new MEAM potential
for magnesium. The MOO procedure is designed to optimally reproduce multiple
target values that consist of important materials properties obtained from
experiments and first-principles calculations based on density-functional
theory (DFT). The optimized target quantities include elastic constants,
cohesive energies, surface energies, vacancy formation energies, and the forces
on atoms in a variety of structures. The accuracy of the new potential is
assessed by computing several material properties of Mg and comparing them with
those obtained from other potentials previously published. We found that the
present MEAM potential yields a significantly better overall agreement with DFT
calculations and experiments.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 06:22:28 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Houze",
"J.",
""
],
[
"Kim",
"Sungho",
""
],
[
"Moitra",
"Amitava",
""
],
[
"Jelinek",
"B.",
""
],
[
"Groh",
"Sebastien",
""
],
[
"Horstemeyer",
"M. F.",
""
],
[
"Acar",
"Erdem",
""
],
[
"Rais-Rohani",
"Masoud",
""
],
[
"Kim",
"Seong-Gon",
""
]
] |
0708.0076 | Emanuela Pompei Dr. | E. Pompei, M. Dahlem, and A. Iovino | Optical and radio survey of Southern Compact Groups of galaxies. I.
Pilot study of six groups | accepted on A&A on July 19, 2007. Figures 1 and 3-12 will be
available only in electronic form | null | 10.1051/0004-6361:20077140 | null | astro-ph | null | Multi-wavelength observations of Hickson's Compact Groups (HCGs) have shown
that many of these groups are physical bound structures and are in different
stage of evolution, from spiral-dominated systems to almost merged objects.
Very few studies have analysed the Southern Compact Groups (SCGs) sample, which
is though to be younger that HCGs, due to an on average higher number of spiral
galaxies. We present here the first results from optical and radio observations
on a pilot sample of SCGs.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 06:22:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pompei",
"E.",
""
],
[
"Dahlem",
"M.",
""
],
[
"Iovino",
"A.",
""
]
] |
0708.0077 | Zhe-Yu Jeff Ou | Z. Y. Ou | Multi-Photon Interference and Temporal Distinguishability of Photons | fixed figures 4,5,7 | null | 10.1142/S0217979207038186 | null | quant-ph | null | A number of recent interference experiments involving multiple photons are
reviewed. These experiments include generalized photon bunching effects,
generalized Hong-Ou-Mandel interference effects and multi-photon interferometry
for demonstrations of multi-photon de Broglie wavelength. The multi-photon
states used in these experiments are from two pairs of photons in parametric
down-conversion. We find that the size of the interference effect in these
experiments, characterized by the visibility of interference pattern, is
governed by the degree of distinguishability among different pairs of photons.
Based on this discovery, we generalize the concept of multi-photon temporal
distinguishability and relate it to a number of multi-photon interference
effects. Finally, we make an attempt to interpret the coherence theory by the
multi-photon interference via the concept of temporal distinguishability of
photons.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 06:27:23 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 17:58:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ou",
"Z. Y.",
""
]
] |
0708.0078 | Jurgen Knodlseder | J\"urgen Kn\"odlseder (CESR), Vincent Lonjou (CESR, CENBG), Georg
Weidenspointner (CESR), Pierre Jean (CESR), Andy Strong (MPE), Roland Diehl
(MPE), Bertrand Cordier (DAPNIA), St\'ephane Schanne (DAPNIA), Christoph
Winkler (ESTEC) | Soft gamma-ray galactic ridge emission as unveiled by SPI aboard
INTEGRAL | null | Dans THE FIRST GLAST SYMPOSIUM - THE FIRST GLAST SYMPOSIUM,
Stanford : \'Etats-Unis d'Am\'erique (2007) | 10.1063/1.2757284 | null | astro-ph | null | The origin of the soft gamma-ray (200 keV - 1 MeV) galactic ridge emission is
one of the long-standing mysteries in the field of high-energy astrophysics.
Population studies at lower energies have shown that emission from accreting
compact objects gradually recedes in this domain, leaving place to another
source of gamma-ray emission that is characterised by a hard power-law spectrum
extending from 100 keV up to 100 MeV The nature of this hard component has
remained so far elusive, partly due to the lack of sufficiently sensitive
imaging telescopes that would be able to unveil the spatial distribution of the
emission. The SPI telescope aboard INTEGRAL allows now for the first time the
simultaneous imaging of diffuse and point-like emission in the soft gamma-ray
regime. We present here all-sky images of the soft gamma-ray continuum emission
that clearly reveal the morphology of the different emission components. We
discuss the implications of our results on the nature of underlying emission
processes and we put our results in perspective of GLAST studies of diffuse
galactic continuum emission.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 06:35:42 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Knödlseder",
"Jürgen",
"",
"CESR"
],
[
"Lonjou",
"Vincent",
"",
"CESR, CENBG"
],
[
"Weidenspointner",
"Georg",
"",
"CESR"
],
[
"Jean",
"Pierre",
"",
"CESR"
],
[
"Strong",
"Andy",
"",
"MPE"
],
[
"Diehl",
"Roland",
"",
"MPE"
],
[
"Cordier",
"Bertrand",
"",
"DAPNIA"
],
[
"Schanne",
"Stéphane",
"",
"DAPNIA"
],
[
"Winkler",
"Christoph",
"",
"ESTEC"
]
] |
0708.0079 | Davy Paindaveine | Marc Hallin, Hannu Oja, Davy Paindaveine | Semiparametrically efficient rank-based inference for shape II. Optimal
R-estimation of shape | Published at http://dx.doi.org/10.1214/009053606000000948 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, 2757-2789 | 10.1214/009053606000000948 | IMS-AOS-AOS0215 | math.ST stat.TH | null | A class of R-estimators based on the concepts of multivariate signed ranks
and the optimal rank-based tests developed in Hallin and Paindaveine [Ann.
Statist. 34 (2006)] is proposed for the estimation of the shape matrix of an
elliptical distribution. These R-estimators are root-n consistent under any
radial density g, without any moment assumptions, and semiparametrically
efficient at some prespecified density f. When based on normal scores, they are
uniformly more efficient than the traditional normal-theory estimator based on
empirical covariance matrices (the asymptotic normality of which, moreover,
requires finite moments of order four), irrespective of the actual underlying
elliptical density. They rely on an original rank-based version of Le Cam's
one-step methodology which avoids the unpleasant nonparametric estimation of
cross-information quantities that is generally required in the context of
R-estimation. Although they are not strictly affine-equivariant, they are shown
to be equivariant in a weak asymptotic sense. Simulations confirm their
feasibility and excellent finite-sample performances.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 06:57:43 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Hallin",
"Marc",
""
],
[
"Oja",
"Hannu",
""
],
[
"Paindaveine",
"Davy",
""
]
] |
0708.0080 | Mihai Patrascu | Mihai Patrascu | Farey Statistics in Time n^{2/3} and Counting Primitive Lattice Points
in Polygons | Fixed a technical error. Added reference to latest work (joint
version with Pawlewicz) | null | null | null | math.NT | null | We present algorithms for computing ranks and order statistics in the Farey
sequence, taking time O (n^{2/3}). This improves on the recent algorithms of
Pawlewicz [European Symp. Alg. 2007], running in time O (n^{3/4}). We also
initiate the study of a more general algorithmic problem: counting primitive
lattice points in planar shapes.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 07:00:38 GMT"
},
{
"version": "v2",
"created": "Fri, 2 Nov 2007 20:14:37 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Patrascu",
"Mihai",
""
]
] |
0708.0081 | Giuseppe Verde | G. Verde (1), P. Danielewicz (2), W.G. Lynch (2), C.F. Chan (2), C.K.
Gelbke (2), K.K. Lau (2), T.X. Liu (2), X.D. Liu (2), D. Seymour (2), R.
Shomin (2), W.P. Tan (2), M.B. Tsang (2), A. Wagner (2), H.S. Xu (2), D.A.
Brown (3), Y. Larochelle (4), R.T. de Souza (4), R. Yanez (4), R.J. Charity
(5), L.G. Sobotka (5) ((1) INFN, Sezione di Catania, Italy, (2) NSCL,
Michigan State University, USA, (3) LLNL, USA, (4) Dep. of Chemistry and
IUCF, Indiana University, USA, (5) Dep. of Chemistry, WU) | d-alpha Correlation functions and collective motion in Xe+Au collisions
at E/A=50 MeV | Accepted for publication on Physics Letters B | Phys.Lett.B653:12-17,2007 | 10.1016/j.physletb.2007.07.031 | null | nucl-ex | null | The interplay of the effects of geometry and collective motion on d-$\alpha$
correlation functions is investigated for central Xe+Au collisions at E/A=50
MeV. The data cannot be explained without collective motion, which could be
partly along the beam axis. A semi-quantitative description of the data can be
obtained using a Monte-Carlo model, where thermal emission is superimposed on
collective motion. Both the emission volume and the competition between the
thermal and collective motion influence significantly the shape of the
correlation function, motivating new strategies for extending intensity
interferometry studies to massive particles.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 07:13:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Verde",
"G.",
""
],
[
"Danielewicz",
"P.",
""
],
[
"Lynch",
"W. G.",
""
],
[
"Chan",
"C. F.",
""
],
[
"Gelbke",
"C. K.",
""
],
[
"Lau",
"K. K.",
""
],
[
"Liu",
"T. X.",
""
],
[
"Liu",
"X. D.",
""
],
[
"Seymour",
"D.",
""
],
[
"Shomin",
"R.",
""
],
[
"Tan",
"W. P.",
""
],
[
"Tsang",
"M. B.",
""
],
[
"Wagner",
"A.",
""
],
[
"Xu",
"H. S.",
""
],
[
"Brown",
"D. A.",
""
],
[
"Larochelle",
"Y.",
""
],
[
"de Souza",
"R. T.",
""
],
[
"Yanez",
"R.",
""
],
[
"Charity",
"R. J.",
""
],
[
"Sobotka",
"L. G.",
""
]
] |
0708.0082 | Pakhlova Galina | Belle Collaboration: G. Pakhlova, et al | Measurement of the near-threshold $e^+e^- \to D \bar D$ cross section
using initial-state radiation | Presented at EPS07 and LP07 conferences, published in PRD(RC) | Phys.Rev.D77:011103,2008 | 10.1103/PhysRevD.77.011103 | BELLE-CONF-0704 | hep-ex | null | We report measurements of the exclusive cross section for $e^+e^- \to D \bar
D $, where $D=D^0$ or $D^+$, in the center-of-mass energy range from the $D
\bar D $ threshold to $5\mathrm{GeV}/c^2$ with initial-state radiation. The
analysis is based on a data sample collected with the Belle detector with an
integrated luminosity of 673 $\mathrm{fb}^{-1}$.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 07:46:49 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 21:54:58 GMT"
},
{
"version": "v3",
"created": "Mon, 14 Jan 2008 11:20:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Belle Collaboration",
"",
""
],
[
"Pakhlova",
"G.",
""
]
] |
0708.0083 | Vladimir Koltchinskii | Vladimir Koltchinskii | 2004 IMS Medallion Lecture: Local Rademacher complexities and oracle
inequalities in risk minimization | This paper discussed in: [arXiv:0708.0089], [arXiv:0708.0094],
[arXiv:0708.0098], [arXiv:0708.0121], [arXiv:0708.0124], [arXiv:0708.0132].
Rejoinder in [arXiv:0708.0135]. Published at
http://dx.doi.org/10.1214/009053606000001019 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, 2593-2656 | 10.1214/009053606000001019 | IMS-AOS-AOS0195 | math.ST stat.TH | null | Let $\mathcal{F}$ be a class of measurable functions $f:S\mapsto [0,1]$
defined on a probability space $(S,\mathcal{A},P)$. Given a sample
(X_1,...,X_n) of i.i.d. random variables taking values in S with common
distribution P, let P_n denote the empirical measure based on (X_1,...,X_n). We
study an empirical risk minimization problem $P_nf\to \min$, $f\in
\mathcal{F}$. Given a solution $\hat{f}_n$ of this problem, the goal is to
obtain very general upper bounds on its excess risk
\[\mathcal{E}_P(\hat{f}_n):=P\hat{f}_n-\inf_{f\in \mathcal{F}}Pf,\] expressed
in terms of relevant geometric parameters of the class $\mathcal{F}$. Using
concentration inequalities and other empirical processes tools, we obtain both
distribution-dependent and data-dependent upper bounds on the excess risk that
are of asymptotically correct order in many examples. The bounds involve
localized sup-norms of empirical and Rademacher processes indexed by functions
from the class. We use these bounds to develop model selection techniques in
abstract risk minimization problems that can be applied to more specialized
frameworks of regression and classification.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:31:18 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Koltchinskii",
"Vladimir",
""
]
] |
0708.0084 | Tejaswi Navilarekallu | Tejaswi Navilarekallu | Equivariant Birch-Swinnerton-Dyer conjecture for the base change of
elliptic curves: An example | 21 pages | null | null | null | math.NT | null | Let E be an elliptic curved defined over $\Q$ and let $K/\Q$ be a finite
Galois extension with Galois group G. The equivariant Birch-Swinnerton-Dyer
conjecture for $h^1(E\times_{\Q} K)(1)$ viewed as a motive over $\Q$ with
coefficients in $\Q[G]$ relates the twisted L-values associated with E with the
arithmetic invariants of the same. In this paper we prescribe an approach to
verify this conjecture for a given data. Using this approach, we verify the
conjecture for an elliptic curve of conductor 11 and an S_3-extension of $\Q$.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:41:45 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Navilarekallu",
"Tejaswi",
""
]
] |
0708.0085 | Svetozar Zhekov | Svetozar A. Zhekov and Francesco Palla | X-Rays From Massive OB Stars: Thermal Emission From Radiative Shocks | 11 pages, 4 figures, 2 tables; accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12286.x | null | astro-ph | null | Chandra gratings spectra of a sample of 15 massive OB stars were analyzed
under the basic assumption that the X-ray emission is produced in an ensemble
of shocks formed in the winds driven by these objects. Shocks develop either as
a result of radiation-driven instabilities or due to confinement of the wind by
relatively strong magnetic field, and since they are radiative, a simple model
of their X-ray emission was developed that allows a direct comparison with
observations. According to our model, the shock structures (clumps, complete or
fractional shells) eventually become `cold' clouds in the X-ray sky of the
star. As a result, it is expected that for large covering factors of the hot
clumps, there is a high probability for X-ray absorption by the `cold' clouds,
resulting in blue-shifted spectral lines. Our analysis has revealed that such a
correlation indeed exists for the considered sample of OB stars. As to the
temperature characteristics of the X-ray emission plasma, the studied OB stars
fall in two groups: (i) one with plasma temperature limited to 0.1-0.4 keV;
(ii) the other wtih X-rays produced in plasmas at considerably higher
temperatures. We argue that the two groups correspond to different mechanisms
for the origin of X-rays: in radiative-driven instability shocks and in
magnetically-confined wind shocks, respectively.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:10:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhekov",
"Svetozar A.",
""
],
[
"Palla",
"Francesco",
""
]
] |
0708.0086 | Alexander Potekhin | P. S. Shternin (1), D. G. Yakovlev (1), P. Haensel (2), A. Y. Potekhin
(1) ((1) Ioffe Phys.-Tech. Inst., St.-Petersburg; (2) N. Copernicus Astron.
Center, Warsaw) | Neutron star cooling after deep crustal heating in the X-ray transient
KS 1731-260 | 5 pages, 2 figures, accepted by MNRAS. In v.2, two references added
and typos corrected | Mon. Not. R. astron. Soc. 382 (2007) L43 | 10.1111/j.1745-3933.2007.00386.x | INT ACK 07-04 | astro-ph | null | We simulate the cooling of the neutron star in the X-ray transient KS
1731-260 after the source returned to quiescence in 2001 from a long (>~ 12.5
yr) outburst state. We show that the cooling can be explained assuming that the
crust underwent deep heating during the outburst stage. In our best theoretical
scenario the neutron star has no enhanced neutrino emission in the core, and
its crust is thin, superfluid, and has the normal thermal conductivity. The
thermal afterburst crust-core relaxation in the star may be not over.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:22:31 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 10:59:59 GMT"
}
] | 2010-02-01T00:00:00 | [
[
"Shternin",
"P. S.",
""
],
[
"Yakovlev",
"D. G.",
""
],
[
"Haensel",
"P.",
""
],
[
"Potekhin",
"A. Y.",
""
]
] |
0708.0087 | Miloslav Znojil | Miloslav Znojil | Quantum toboggans with two branch points | 19pp, 3 figs, presented also as a part of the lecture for QTS-5
conference in Valladolid, Spain, during July 22-28, 2007 (see its webpage
http://tristan.fam.cie.uva.es/qts5) | Phys. Lett. A 372 (2008) 584 - 590 | 10.1016/j.physleta.2007.07.072 | null | quant-ph | null | Wave functions describing quantum toboggans with two branch points (QT2) are
defined along complex contours of coordinates which spiral around these branch
points. The classification of QT2 is found in terms of certain ``winding
descriptors" $\varrho$. A mapping $x^{(\varrho)}(s) \to y^{(0)}(s)$ is then
presented which rectifies the contours for a subset of the simplest
$\varrho=\varrho_0$.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:23:19 GMT"
}
] | 2008-09-09T00:00:00 | [
[
"Znojil",
"Miloslav",
""
]
] |
0708.0088 | Sergey Ganichev | H. Diehl, V.A. Shalygin, S.N. Danilov, S.A. Tarasenko, V.V. Bel'kov,
D. Schuh, W. Wegscheider, W. Prettl and S.D. Ganichev | Magneto-gyrotropic photogalvanic effects due to inter-subband absorption
in quantum wells | null | null | 10.1088/0953-8984/19/43/436232 | null | cond-mat.mtrl-sci | null | We report on the observation of the magneto-photogalvanic effect (MPGE) due
to inter-subband transitions in (001)-oriented GaAs quantum wells. This effect
is related to the gyrotropic properties of the structures. It is shown that
inter-subband absorption of linearly polarized radiation may lead to
spin-related as well as spin independent photocurrents if an external magnetic
field is applied in the plane of the quantum well. The experimental results are
analyzed in terms of the phenomenological theory and microscopic models of MPGE
based on either asymmetric optical excitation or asymmetric relaxation of
carriers in k-space. We observed resonant photocurrents not only at oblique
incidence of radiation but also at normal incidence demonstrating that
conventionally applied selection rules for the inter-subband optical
transitions are not rigorous.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:15:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Diehl",
"H.",
""
],
[
"Shalygin",
"V. A.",
""
],
[
"Danilov",
"S. N.",
""
],
[
"Tarasenko",
"S. A.",
""
],
[
"Bel'kov",
"V. V.",
""
],
[
"Schuh",
"D.",
""
],
[
"Wegscheider",
"W.",
""
],
[
"Prettl",
"W.",
""
],
[
"Ganichev",
"S. D.",
""
]
] |
0708.0089 | Peter L. Bartlett | Peter L. Bartlett, Shahar Mendelson | Discussion of "2004 IMS Medallion Lecture: Local Rademacher complexities
and oracle inequalities in risk minimization" by V. Koltchinskii | Published at http://dx.doi.org/10.1214/009053606000001028 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, 2657-2663 | 10.1214/009053606000001028 | IMS-AOS-AOS0195A | q-fin.RM math.ST stat.TH | null | Discussion of "2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization" by V. Koltchinskii [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:31:24 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Bartlett",
"Peter L.",
""
],
[
"Mendelson",
"Shahar",
""
]
] |
0708.0090 | Seyyed Nader Rasuli | Seyyed Nader Rasuli and Ramin Golestanian | Soret Motion of a Charged Spherical Colloid | 4 pages, 2 figures. Accepted for Phys. Rev. Lett | null | null | null | cond-mat.soft cond-mat.mtrl-sci cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermophoretic motion of a charged spherical colloidal particle and its
accompanying cloud of counterions and co-ions in a temperature gradient is
studied theoretically. Using the Debye-Huckel approximation, the Soret drift
velocity of a weakly charged colloid is calculated analytically. For highly
charged colloids, the nonlinear system of electrokinetic equations is solved
numerically, and the effects of high surface potential, dielectrophoresis, and
convection are examined. Our results are in good agreement with some of the
recent experiments on highly charged colloids without using adjustable
parameters.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:39:56 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jun 2008 11:05:57 GMT"
},
{
"version": "v3",
"created": "Tue, 5 Aug 2008 14:55:22 GMT"
}
] | 2008-08-05T00:00:00 | [
[
"Rasuli",
"Seyyed Nader",
""
],
[
"Golestanian",
"Ramin",
""
]
] |
0708.0091 | Stijn Bruers Mr | S. Bruers, F. Meysman | A useful correspondence between fluid convection and ecosystem operation | 22 pages, 6 figures | null | null | null | physics.flu-dyn physics.bio-ph | null | Both ecological systems and convective fluid systems are examples of open
systems which operate far-from-equilibrium. This article demonstrates that
there is a correspondence between a resource-consumer chemostat ecosystem and
the Rayleigh-Benard (RB) convective fluid system. The Lorenz dynamics of the RB
system can be translated into an ecosystem dynamics. Not only is there a
correspondence between the dynamical equations, also the physical
interpretations show interesting analogies. By using this fluid-ecosystem
analogy, we are able to derive the correct value of the size of convection
rolls by competitive fitness arguments borrowed from ecology. We finally
conjecture that the Lorenz dynamics can be extended to describe more complex
convection patterns that resemble ecological predation.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:42:12 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Bruers",
"S.",
""
],
[
"Meysman",
"F.",
""
]
] |
0708.0092 | Zbigniew Idziaszek | Z. Idziaszek, L. Zawitkowski, M. Gajda, K. Rzazewski | Fluctuations of a weakly interacting Bose-Einstein condensate | 4 pages, 4 figures; vastly improved version, now includes thermal
atom interactions for the condensate statistics | Eur. Phys. Lett.. 86, 10002 (2009) | 10.1209/0295-5075/86/10002 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fluctuations of the number of condensed atoms in a finite-size, weakly
interacting Bose gas confined in a box potential are investigated for
temperatures up to the critical region. The canonical partition functions are
evaluated using a recursive scheme for smaller systems, and a saddle-point
approximation for larger samples, that allows to treat realistic size systems
containing up to $N \sim 10^5$ particles. We point out the importance of
particle-number constrain and interactions between out of condensate atoms for
the statistics near the critical region. For sufficiently large systems the
crossover from the anomalous to normal scaling of the fluctuations is observed.
The excitations are described in a self-consistent way within the
Bogoliubov-Popov approximation, and the interactions between thermal atoms are
described by means of the Hartree-Fock method.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:51:33 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Dec 2008 21:14:27 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Idziaszek",
"Z.",
""
],
[
"Zawitkowski",
"L.",
""
],
[
"Gajda",
"M.",
""
],
[
"Rzazewski",
"K.",
""
]
] |
0708.0093 | Niels Borne | Niels Borne, Michel Emsalem | Note sur la d\'etermination alg\'ebrique du groupe fondamental
pro-r\'esoluble d'une courbe affine | v2, minor changes, exposition improved | null | null | null | math.AG math.NT | null | Let X be a smooth projective algebraic curve of genus g minus $r\geq 1$
points defined over an algebraically closed field k of characteristic $p\geq
0$. The structure of the largest prime to p quotient of the \'etale fundamental
group is well known by transcendental methods : it is isomorphic to the largest
prime to p quotient of a free pro-finite group on 2g+r-1 generators. We show
that, with purely algebraic means, we can prove the corresponding result for
the largest pro-solvable quotient of these groups.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:46:55 GMT"
},
{
"version": "v2",
"created": "Wed, 7 May 2008 13:24:55 GMT"
}
] | 2008-05-07T00:00:00 | [
[
"Borne",
"Niels",
""
],
[
"Emsalem",
"Michel",
""
]
] |
0708.0094 | Gilles Blanchard | Gilles Blanchard, Pascal Massart | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher
complexities and oracle inequalities in risk minimization'' by V.
Koltchinskii | Published at http://dx.doi.org/10.1214/009053606000001037 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, 2664-2671 | 10.1214/009053606000001037 | IMS-AOS-AOS0195B | math.ST stat.TH | null | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization'' by V. Koltchinskii [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:46:57 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Blanchard",
"Gilles",
""
],
[
"Massart",
"Pascal",
""
]
] |
0708.0095 | Daniel Cumberbatch Mr | Daniel Cumberbatch, Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori
Kohri, Joseph Silk and Glenn D. Starkman | Solving the cosmic lithium problems with primordial late-decaying
particles | 6 pages, 3 figures, submitted to Physical Review D; minor changes to
references | Phys.Rev.D76:123005,2007 | 10.1103/PhysRevD.76.123005 | null | astro-ph hep-ph | null | We investigate the modifications to predictions for the abundances of light
elements from standard Big-Bang nucleosynthesis when exotic late-decaying
particles with lifetimes exceeding ~1 sec are prominent in the early Universe.
Utilising a model-independent analysis of the properties of these long-lived
particles, we identify the parameter space associated with models that are
consistent with all observational data and hence resolve the much discussed
discrepancies between observations and theoretical predictions for the
abundances of Li^7 and Li^6.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:18:33 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 15:17:01 GMT"
},
{
"version": "v3",
"created": "Tue, 25 Sep 2007 17:43:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cumberbatch",
"Daniel",
""
],
[
"Ichikawa",
"Kazuhide",
""
],
[
"Kawasaki",
"Masahiro",
""
],
[
"Kohri",
"Kazunori",
""
],
[
"Silk",
"Joseph",
""
],
[
"Starkman",
"Glenn D.",
""
]
] |
0708.0096 | Laura Stanford Ms | Laura M. Stanford, G. S. Da Costa and John E. Norris | Abundances on the Main Sequence of Omega Centauri | 43 Pages, 13 Figures. Accepted for publication in ApJ | null | 10.1086/520794 | null | astro-ph | null | Abundance ratios of carbon, nitrogen and strontium relative to iron,
calculated using spectrum synthesis techniques, are given for a sample of main
sequence and turnoff stars that belong to the globular cluster omega Centauri.
The variations of carbon, nitrogen and/or strontium show several different
abundance patterns as a function of [Fe/H]. The source of the
enhancements/depletions in carbon, nitrogen and/or strontium may be enrichment
from asymptotic giant branch stars of low (1--3 solar masses) and intermediate
(3--8 solar masses) mass. Massive rotating stars which produce excess nitrogen
without carbon and oxygen overabundances may also play a role. These abundances
enable different contributors to be considered and incorporated into the
evolutionary picture of omega Cen.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 08:59:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stanford",
"Laura M.",
""
],
[
"Da Costa",
"G. S.",
""
],
[
"Norris",
"John E.",
""
]
] |
0708.0097 | Stuart Littlefair | S. P. Littlefair, V. S. Dhillon, T. R. Marsh, B. T. Gaensicke, I.
Baraffe, C. A. Watson | SDSS J150722.30+523039.8: a CV formed directly from a detached white
dwarf/brown dwarf binary? | 9 pages, 4 figures, 4 tables. Accepted for publication in the Monthly
Notices of the Royal Astronomical Society | null | 10.1111/j.1365-2966.2007.12285.x | null | astro-ph | null | We present high-speed, three-colour photometry of the eclipsing cataclysmic
variable SDSS J150722.30+523039.8 (hereafter SDSS J1507). This system has an
orbital period of 66.61 minutes, placing it below the observed ``period
minimum'' for cataclysmic variables. We determine the system parameters via a
parameterised model of the eclipse fitted to the observed lightcurve by chi^2
minimisation. We obtain a mass ratio of q = 0.0623 +/- 0.0007 and an orbital
inclination i = 83.63 +/- 0.05 degrees. The primary mass is M_w = 0.90 +/- 0.01
M_sun. The secondary mass and radius are found to be M_r =0.056 +/- 0.001 M_sun
and R_r = 0.096 +/- 0.001 R_sun respectively. We find a distance to the system
of 160 +/- 10 pc. The secondary star in SDSS J1507 has a mass substantially
below the hydrogen burning limit, making it the second confirmed sub-stellar
donor in a cataclysmic variable.
The very short orbital period of SDSS J1507 is readily explained if the
secondary star is nuclearly evolved, or if SDSS J1507 formed directly from a
detached white dwarf/brown dwarf binary. Given the lack of any visible
contribution from the secondary star, the very low secondary mass and the low
HeI(6678AA)/Halpha emission line ratio, we argue that SDSS J1507 probably
formed directly from a detached white dwarf/brown dwarf binary. If confirmed,
SDSS J1507 will be the first such system identified. The implications for
binary star evolution, the brown-dwarf desert and the common envelope phase are
discussed.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:01:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Littlefair",
"S. P.",
""
],
[
"Dhillon",
"V. S.",
""
],
[
"Marsh",
"T. R.",
""
],
[
"Gaensicke",
"B. T.",
""
],
[
"Baraffe",
"I.",
""
],
[
"Watson",
"C. A.",
""
]
] |
0708.0098 | Nicolas Vayatis | St\'ephan Cl\'emen\c{c}on, G\'abor Lugosi, Nicolas Vayatis | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher
complexities and oracle inequalities in risk minimization'' by V.
Koltchinskii | Published at http://dx.doi.org/10.1214/009053606000001046 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, 2672-2676 | 10.1214/009053606000001046 | IMS-AOS-AOS0195C | q-fin.RM math.ST stat.TH | null | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization'' by V. Koltchinskii [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:05:09 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Clémençon",
"Stéphan",
""
],
[
"Lugosi",
"Gábor",
""
],
[
"Vayatis",
"Nicolas",
""
]
] |
0708.0099 | Changxing Miao | Qionglei Chen, Changxing Miao and Zhifei Zhang | On the well-posedness for the Ideal MHD equations in the
Triebel-Lizorkin spaces | 16pages | Arch. Rational Mech. Anal.195(2010)561-578 | 10.1007/s00205-008-0213-6 | null | math.AP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we prove the local well-posedness for the Ideal MHD equations
in the Triebel-Lizorkin spaces and obtain blow-up criterion of smooth
solutions. Specially, we fill a gap in a step of the proof of the local
well-posedness part for the incompressible Euler equation in \cite{Chae1}.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:07:32 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Dec 2009 05:53:45 GMT"
}
] | 2009-12-24T00:00:00 | [
[
"Chen",
"Qionglei",
""
],
[
"Miao",
"Changxing",
""
],
[
"Zhang",
"Zhifei",
""
]
] |
0708.0100 | Dario Grasso | C. Evoli (SISSA), D. Grasso (INFN, Pisa), L. Maccione (SISSA, and
INFN, Trieste) | Gamma-ray and neutrino diffuse emissions of the Galaxy above the TeV | 4 pages + 1 figure. To appear in the proceedings of 30th
International Cosmic Ray Conference (ICRC 2007), Merida, Yucatan, Mexico,
3-11 Jul 2007 | null | null | null | astro-ph | null | In this contribution we will discuss recent results concerning the intensity
and the angular distribution of the gamma-ray and neutrino emissions as should
be originated from the hadronic scattering of cosmic rays (CR) with the
interstellar medium (ISM). We assumed that CR sources are supernova remnants
(SNR) and estimated the spatial distribution of primary nuclei by solving
numerically the diffusion equation. For the ISM, we considered recent models
for the 3D spatial distributions of molecular hydrogen. Respect to previous
results, we find the secondary gamma-ray and neutrino emissions to be more
peaked along the galactic equator and in the galactic centre which improves
significantly the perspectives of a positive detection. We compare our
predictions with the experimental limits/observations by MILAGRO and TIBET (for
the gamma-rays) and by AMANDA-II (for the neutrinos) and discuss the detection
perspectives for a km3 neutrino telescope to be built in the North hemisphere.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:10:14 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Evoli",
"C.",
"",
"SISSA"
],
[
"Grasso",
"D.",
"",
"INFN, Pisa"
],
[
"Maccione",
"L.",
"",
"SISSA, and\n INFN, Trieste"
]
] |
0708.0101 | D. A. Glazov | N. S. Oreshkina, D. A. Glazov, A. V. Volotka, V. M. Shabaev, I. I.
Tupitsyn, and G. Plunien | Radiative and interelectronic-interaction corrections to the hyperfine
splitting in highly charged B-like ions | 12 pages, 2 figures, 3 tables | Physics Letters A, 372 (2008) 675 | 10.1016/j.physleta.2007.08.068 | null | physics.atom-ph | null | The ground-state hyperfine splitting values of high-Z boronlike ions are
calculated. Calculation of the interelectronic-interaction contribution is
based on a combination of the 1/Z perturbation theory and the large-scale
configuration-interaction Dirac-Fock-Sturm method. The screened QED corrections
are evaluated utilizing an effective screening potential approach. Total
hyperfine splitting energies are presented for several B-like ions of
particular interest: {}^{45}Sc{}^{16+}, {}^{57}Fe{}^{21+}, {}^{207}Pb{}^{77+},
and {}^{209}Bi{}^{78+}. For lead and bismuth the experimental values of the 1s
hyperfine splitting are employed to improve significantly the theoretical
results by reducing the uncertainty due to the nuclear effects.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:21:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Oreshkina",
"N. S.",
""
],
[
"Glazov",
"D. A.",
""
],
[
"Volotka",
"A. V.",
""
],
[
"Shabaev",
"V. M.",
""
],
[
"Tupitsyn",
"I. I.",
""
],
[
"Plunien",
"G.",
""
]
] |
0708.0102 | Maria Barbero-Li\~nan | Maria Barbero-Li\~nan, Miguel C. Mu\~noz-Lecanda | Constraint Algorithm for Extremals in Optimal Control Problems | 15 pages. The introduction and the abstract have been modified. The
paper has been significantly shortened. The previous examples have been
substituted for a new example | null | null | null | math.OC math-ph math.MP | null | A geometric method is described to characterize the different kinds of
extremals in optimal control theory. This comes from the use of a presymplectic
constraint algorithm starting from the necessary conditions given by
Pontryagin's Maximum Principle. Apart from the design of this general algorithm
useful for any optimal control problem, it is showed how it works to split the
set of extremals and, in particular, to characterize the strict abnormality. An
example of strict abnormal extremal for a particular control-affine system is
also given.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:23:57 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 15:33:01 GMT"
},
{
"version": "v3",
"created": "Wed, 6 Feb 2008 10:35:30 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Barbero-Liñan",
"Maria",
""
],
[
"Muñoz-Lecanda",
"Miguel C.",
""
]
] |
0708.0103 | Vidar Gudmundsson | Gunnar Thorgilsson, Chi-Shung Tang, Vidar Gudmundsson | Time-dependent magnetotransport of a wave packet in a quantum wire with
embedded quantum dots | RevTeX, 9 pages with 8 included postscript figures | Phys. Rev. B 76, 195314 (2007) | 10.1103/PhysRevB.76.195314 | null | cond-mat.mes-hall | null | We consider wave packet propagation in a quantum wire with either an embedded
antidot or an embedded parallel double open quantum dot under the influence of
a uniform magnetic field. The magnetoconductance and the time evolution of an
electron wave packet are calculated based on the Lippmann-Schwinger formalism.
This approach allows us to look at arbitrary embedded potential profiles and
illustrate the results by performing computational simulations for the
conductance and the time evolution of the electron wave packet through the
quantum wire. In the double-dot system we observe a long-lived resonance state
that enhances the spatial spreading of the wave packet, and quantum
skipping-like trajectories are induced when the envelop function of the wave
packet covers several subbands in appropriate magnetic fields.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 09:35:24 GMT"
}
] | 2008-07-29T00:00:00 | [
[
"Thorgilsson",
"Gunnar",
""
],
[
"Tang",
"Chi-Shung",
""
],
[
"Gudmundsson",
"Vidar",
""
]
] |
0708.0104 | Fethi Mahmoudi | Fethi Mahmoudi and Andrea Malchiodi | Solutions to the nonlinear Schroedinger equation carrying momentum along
a curve. Part II: proof of the existence result | 49 pages | null | null | null | math.AP | null | We prove existence of a special class of solutions to the (elliptic)
Nonlinear Schroedinger Equation $- \epsilon^2 \Delta \psi + V(x) \psi =
|\psi|^{p-1} \psi$ on a manifold or in the Euclidean space. Here V represents
the potential, p is an exponent greater than 1 and $\epsilon$ a small parameter
corresponding to the Planck constant. As $\epsilon$ tends to zero (namely in
the semiclassical limit) we prove existence of complex-valued solutions which
concentrate along closed curves, and whose phase in highly oscillatory.
Physically, these solutions carry quantum-mechanical momentum along the limit
curves. In the first part of this work we identified the limit set and
constructed approximate solutions, while here we give the complete proof of our
main existence result.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:27:32 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Mahmoudi",
"Fethi",
""
],
[
"Malchiodi",
"Andrea",
""
]
] |
0708.0105 | Hidekazu Tanaka | Hidekazu Tanaka, Yu Matsuda and Hirokazu Kobayashi (Rikkyo University) | Kinematical Constraints on QCD Factorization in the Drell-Yan Process | 10 pages, PTPTeX.sty, 1 Postscript figure | Prog.Theor.Phys.118:749-758,2007 | 10.1143/PTP.118.749 | RUP-07-2 | hep-ph | null | We study factorization schemes for parton shower models in hadron-hadron
collisions. As an example, we calculate lepton pair production mediated by a
virtual photon in quark--anti-quark annihilation, and we compare factorized
cross sections obtained in the conventional $\bar{\rm MS}$ scheme with those
obtained in a factorization scheme in which a kinematical constraint due to
parton radiation is taken into account. We discuss some properties of
factorized cross sections.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:27:13 GMT"
},
{
"version": "v2",
"created": "Wed, 31 Oct 2007 09:35:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tanaka",
"Hidekazu",
"",
"Rikkyo University"
],
[
"Matsuda",
"Yu",
"",
"Rikkyo University"
],
[
"Kobayashi",
"Hirokazu",
"",
"Rikkyo University"
]
] |
0708.0106 | Haili Hu | H. Hu, G. Nelemans, R. {\O}stensen, C. Aerts, M. Vu\v{c}kovi\'c, P.J.
Groot | An evolutionary study of the pulsating subdwarf B eclipsing binary
PG1336-018 (NY Vir) | 9 pages, 7 figures, 2 tables, accepted for publication in A&A | null | 10.1051/0004-6361:20077133 | null | astro-ph | null | The formation of subdwarf B (sdB) stars is not well understood within the
current framework of stellar single and binary evolution. In this study, we
focus on the formation and evolution of the pulsating sdB star in the very
short-period eclipsing binary PG1336-018. We aim at refining the formation
scenario of this unique system, so that it can be confronted with observations.
We probe the stellar structure of the progenitors of sdB stars in short-period
binaries using detailed stellar evolution calculations. Applying this to
PG1336-018 we reconstruct the common-envelope phase during which the sdB star
was formed. The results are interpreted in terms of the standard
common-envelope formalism (the alpha-formalism) based on the energy equation,
and an alternative description (the gamma-formalism) using the angular momentum
equation. We find that if the common-envelope evolution is described by the
alpha-formalism, the sdB progenitor most likely experienced a helium flash. We
then expect the sdB mass to be between 0.39 and 0.48 Msun, and the sdB
progenitor initial mass to be below ~2 Msun. However, the results for the
gamma-formalism are less restrictive, and a broader sdB mass range (0.3 - 0.8
Msun) is possible in this case. Future seismic mass determination will give
strong constraints on the formation of PG1336-018 and, in particular, on the CE
phase.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:47:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hu",
"H.",
""
],
[
"Nelemans",
"G.",
""
],
[
"Østensen",
"R.",
""
],
[
"Aerts",
"C.",
""
],
[
"Vučković",
"M.",
""
],
[
"Groot",
"P. J.",
""
]
] |
0708.0107 | Dr. Anirudh Pradhan | Anirudh Pradhan | Magnetized String Cosmological Model in Cylindrically Symmetric
Inhomogeneous Universe with Variable Cosmological-Term $\Lambda$ | 19 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:0705.0904 | FizikaB16:205-222,2007 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cylindrically symmetric inhomogeneous magnetized string cosmological model is
investigated with cosmological term $\Lambda$ varying with time. To get the
deterministic solution, it has been assumed that the expansion ($\theta$) in
the model is proportional to the eigenvalue $\sigma^{1}_{1}$ of the shear
tensor $\sigma^{i}_{j}$. The value of cosmological constant for the model is
found to be small and positive which is supported by the results from recent
supernovae Ia observations. The physical and geometric properties of the model
are also discussed in presence and absence of magnetic field.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:07:47 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Jul 2008 14:42:00 GMT"
}
] | 2014-05-06T00:00:00 | [
[
"Pradhan",
"Anirudh",
""
]
] |
0708.0108 | Richard Hill | Richard Hill | Geometric construction of metaplectic covers of $\GL_{n}$ in
characteristic zero | 90 pages | null | null | null | math.NT | null | This paper presents a new construction of the m-fold metaplectic cover of
$\GL_{n}$ over an algebraic number field k, where k contains a primitive m-th
root of unity. A 2-cocycle on $\GL_{n}(\A)$ representing this extension is
given and the splitting of the cocycle on $\GL_{n}(k)$ is found explicitly. The
cocycle is smooth at almost all places of k. As a consequence, a formula for
the Kubota symbol on $\SL_{n}$ is obtained. The construction of the paper
requires neither class field theory nor algebraic K-theory, but relies instead
on naive techniques from the geometry of numbers introduced by W. Habicht and
T. Kubota. The power reciprocity law for a number field is obtained as a
corollary.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:10:31 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Hill",
"Richard",
""
]
] |
0708.0109 | Xavier Tolsa | Xavier Tolsa | Principal values for Riesz transforms and rectifiability | 47 pages | null | null | null | math.CA math.FA | null | Let $E\subset R^d$ with $H^n(E)<\infty$, where H^n stands for the
$n$-dimensional Hausdorff measure. In this paper we prove that E is
n-rectifiable if and only if the limit $$\lim_{\ve\to0}\int_{y\in E:|x-y|>\ve}
\frac{x-y}{|x-y|^{n+1}} dH^n(y)$$ exists H^n-almost everywhere in E. To prove
this result we obtain precise estimates from above and from below for the $L^2$
norm of the n-dimensional Riesz transforms on Lipschitz graphs.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:11:11 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Tolsa",
"Xavier",
""
]
] |
0708.0110 | Chris Lee | Chris J. Lee, Tim Molteno and Peter J. Manson | Metropolis simulations of the manipulation of DNA strands in solution | This paper has been withdrawn | null | null | null | cond-mat.soft cond-mat.other | null | This paper has been withdrawn by the authors.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:39:37 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 08:05:42 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Lee",
"Chris J.",
""
],
[
"Molteno",
"Tim",
""
],
[
"Manson",
"Peter J.",
""
]
] |
0708.0111 | Karen Alim | Karen Alim and Erwin Frey | Fluctuating semiflexible polymer ribbon constrained to a ring | 6 pages, 3 figures, Version as published in Eur. Phys. J. E | Eur. Phys. J. E 24, 185 (2007) | 10.1140/epje/i2007-10228-x | LMU-ASC 52/07 | q-bio.BM cond-mat.soft | null | Twist stiffness and an asymmetric bending stiffness of a polymer or a polymer
bundle is captured by the elastic ribbon model. We investigate the effects a
ring geometry induces to a thermally fluctuating ribbon, finding bend-bend
coupling in addition to twist-bend coupling. Furthermore, due to the geometric
constraint the polymer's effective bending stiffness increases. A new parameter
for experimental investigations of polymer bundles is proposed: the mean square
diameter of a ribbonlike ring, which is determined analytically in the
semiflexible limit. Monte Carlo simulations are performed which affirm the
model's prediction up to high flexibility.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:17:15 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 12:53:56 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Alim",
"Karen",
""
],
[
"Frey",
"Erwin",
""
]
] |
0708.0112 | Valentin Flunkert | Valentin Flunkert, Eckehard Schoell | Suppressing noise-induced intensity pulsations in semiconductor lasers
by means of time-delayed feedback | 9 pages, 12 figures | null | 10.1103/PhysRevE.76.066202 | null | nlin.CD | null | We investigate the possibility to suppress noise-induced intensity pulsations
(relaxation oscillations) in semiconductor lasers by means of a time-delayed
feedback control scheme. This idea is first studied in a generic normal form
model, where we derive an analytic expression for the mean amplitude of the
oscillations and demonstrate that it can be strongly modulated by varying the
delay time. We then investigate the control scheme analytically and numerically
in a laser model of Lang-Kobayashi type and show that relaxation oscillations
excited by noise can be very efficiently suppressed via feedback from a
Fabry-Perot resonator.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:20:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Flunkert",
"Valentin",
""
],
[
"Schoell",
"Eckehard",
""
]
] |
0708.0113 | Vasiliki Mitsou | Vasiliki A. Mitsou (Valencia U., IFIC) | Constraints on Dissipative Non-Equilibrium Dark Energy Models from
Recent Supernova Data | 5 pages LaTeX, 1 EPS figure. Contributed to Lake Louise Winter
Institute 2007: Fundamental Interactions, 19-24 Feb 2007, Lake Louise,
Alberta, Canada | null | 10.1142/9789812776105_0038 | null | astro-ph gr-qc hep-th | null | Non-critical string cosmologies may be viewed as the analogue of
off-equilibrium models arising within string theory as a result of a cosmically
catastrophic event in the early Universe. Such models entail relaxing-to-zero
dark energies provided by a rolling dilaton field at late times. We discuss
fits of such non-critical models to high-redshift supernovae data, including
the recent ones by HST and ESSENCE and compare the results with those of a
conventional model with Cold Dark Matter and a cosmological constant and a
model invoking super-horizon perturbations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:19:44 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Mitsou",
"Vasiliki A.",
"",
"Valencia U., IFIC"
]
] |
0708.0114 | Richard Hill | Richard Hill | Shintani Cocycles on $\GL_{n}$ | 14 pages. To appear in LMS Bulletin | null | 10.1112/blms/bdm099 | null | math.NT | null | The aim of this paper is to define an n-1-cocycle $\sigma$ on $\GL_{n}(\Q)$
with values in a certain space $\hD$ of distributions on
$\A_f^{n}\setminus\{0\}$. Here $\A_f$ denotes the ring of finite ad\`{e}les of
$\Q$, and the distributions take values in the Laurent series
$\C((z_{1},...,z_{n}))$. This cocycle can be used to evaluate special values of
Artin L-functions on number fields at negative integers. The construction
generalizes that of Solomon in the case n=2.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:23:21 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Hill",
"Richard",
""
]
] |
0708.0115 | Jouni Suhonen | Markus Kortelainen, Jouni Suhonen | Nuclear matrix elements of neutrinoless double beta decay with improved
short-range correlations | Two figures, to be published in Physical Review C (2007) as a regular
article | Phys.Rev.C76:024315,2007 | 10.1103/PhysRevC.76.024315 | null | nucl-th | null | Nuclear matrix elements of the neutrinoless double beta decays of 96Zr,
100Mo, 116Cd, 128Te, 130Te and 136Xe are calculated for the light-neutrino
exchange mechanism by using the proton-neutron quasiparticle random-phase
approximation (pnQRPA) with a realistic nucleon-nucleon force. The g_pp
parameter of the pnQRPA is fixed by the data on the two-neutrino double beta
decays and single beta decays. The finite size of a nucleon, the higher-order
terms of nucleonic weak currents, and the nucleon-nucleon short-range
correlations (s.r.c) are taken into account. The s.r.c. are computed by the
traditional Jastrow method and by the more advanced unitary correlation
operator method (UCOM). Comparison of the results obtained by the two methods
is carried out. The UCOM computed matrix elements turn out to be considerably
larger than the Jastrow computed ones. This result is important for the
assessment of the neutrino-mass sensitivity of the present and future double
beta experiments.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:24:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kortelainen",
"Markus",
""
],
[
"Suhonen",
"Jouni",
""
]
] |
0708.0116 | Nicolas Michel | N. Michel and M.V. Stoitsov | Fast computation of the Gauss hypergeometric function with all its
parameters complex with application to the Poschl-Teller-Ginocchio potential
wave functions | 29 pages; accepted in Computer Physics Communications | null | 10.1016/j.cpc.2007.11.007 | null | math-ph math.MP | null | The fast computation of the Gauss hypergeometric function 2F1 with all its
parameters complex is a difficult task. Although the 2F1 function verifies
numerous analytical properties involving power series expansions whose
implementation is apparently immediate, their use is thwarted by instabilities
induced by cancellations between very large terms. Furthermore, small areas of
the complex plane are inaccessible using only 2F1 power series formulas, thus
rendering 2F1 evaluations impossible on a purely analytical basis. In order to
solve these problems, a generalization of R.C. Forrey's transformation theory
has been developed. The latter has been successful in treating the 2F1 function
with real parameters. As in real case transformation theory, the large
canceling terms occurring in 2F1 analytical formulas are rigorously dealt with,
but by way of a new method, directly applicable to the complex plane. Taylor
series expansions are employed to enter complex areas outside the domain of
validity of power series analytical formulas. The proposed algorithm, however,
becomes unstable in general when |a|,|b|,|c| are moderate or large. As a
physical application, the calculation of the wave functions of the analytical
Poschl-Teller-Ginocchio potential involving 2F1 evaluations is considered.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:00:32 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 08:33:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Michel",
"N.",
""
],
[
"Stoitsov",
"M. V.",
""
]
] |
0708.0117 | Luc Fruchter | L. Fruchter, H. Raffy, Z.Z. Li | Resistance noise in Bi_2Sr_2CaCu_2O$_{8+\delta}$ | null | Phys. Rev. B 76, 212503 (2007) | 10.1103/PhysRevB.76.212503 | null | cond-mat.supr-con cond-mat.dis-nn | null | The resistance noise in a Bi_2Sr_2CaCu_2O$_{8+\delta}$ thin film is found to
increase strongly in the underdoped regime. While the increase of the raw
resistance noise with decreasing temperature appears to roughly track the
previously reported pseudogap temperature for this material, standard noise
analysis rather suggests that the additional noise contribution is driven by
the proximity of the superconductor-insulator transition.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:43:34 GMT"
}
] | 2011-02-04T00:00:00 | [
[
"Fruchter",
"L.",
""
],
[
"Raffy",
"H.",
""
],
[
"Li",
"Z. Z.",
""
]
] |
0708.0118 | Mohammad Reza Setare | M. R. Setare | Interacting holographic generalized Chaplygin gas model | 12 pages, no figure | Phys.Lett.B654:1-6,2007 | 10.1016/j.physletb.2007.08.038 | null | hep-th | null | In this paper we consider a correspondence between the holographic dark
energy density and interacting generalized Chaplygin gas energy density in FRW
universe. Then we reconstruct the potential of the scalar field which describe
the generalized Chaplygin cosmology.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:45:03 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 11:39:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Setare",
"M. R.",
""
]
] |
0708.0119 | Javier Virto | Rafel Escribano, Joaquim Matias, Javier Virto (Barcelona, IFAE) | Sum rules for B-->pi eta('), K eta('), eta(') eta(') decays | 18 pages, 4 figures. Version published in PLB | Phys.Lett.B659:870-877,2008 | 10.1016/j.physletb.2007.12.023 | UAB-FT-634 | hep-ph | null | We provide a set of sum rules, using flavour symmetries, relating CP-averaged
ratios and CP asymmetries of different neutral and charged B mesons decaying
into an eta(') particle together with a pion, a kaon or a second eta('). These
sume rules allow us to give a prediction for the B^0-->K^0 eta branching ratio.
We also predict a clear sign anti-correlation between the two B^0-->pi^0
(eta,eta') CP-asymmetries, and find a combined constraint on the branching
ratios and CP-asymmetries of the three B-->eta(')eta(') decay modes.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:47:25 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 11:25:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Escribano",
"Rafel",
"",
"Barcelona, IFAE"
],
[
"Matias",
"Joaquim",
"",
"Barcelona, IFAE"
],
[
"Virto",
"Javier",
"",
"Barcelona, IFAE"
]
] |
0708.0120 | Michael Schreiber | Michael Schreiber | A case study of the Hirsch index for 26 non-prominent physicists | 13 pages, 3 figures, updated after extensive language editing, no
other changes to first version | AnnalenPhys.16:640-652,1997 | 10.1002/andp.200710252 | null | physics.soc-ph | null | The h index was introduced by Hirsch to quantify an individual's scientific
research output. It has been widely used in different fields to show the
relevance of the research work of prominent scientists. I have worked out 26
practical cases of physicists which are not so prominent. Therefore this case
study should be more relevant to discuss various features of the Hirsch index
which are interesting or disturbing or both for the more average situation. In
particular, I investigate quantitatively some pitfalls in the evaluation and
the influence of self-citations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:48:34 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 10:11:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Schreiber",
"Michael",
""
]
] |
0708.0121 | Xiaotong Shen | Xiaotong Shen, Lifeng Wang | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher
complexities and oracle inequalities in risk minimization'' by V.
Koltchinskii | Published at http://dx.doi.org/10.1214/009053606000001055 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, 2677-2680 | 10.1214/009053606000001055 | IMS-AOS-AOS0195D | q-fin.RM math.ST stat.TH | null | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization'' by V. Koltchinskii [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:51:14 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Shen",
"Xiaotong",
""
],
[
"Wang",
"Lifeng",
""
]
] |
0708.0122 | Kwan Chuen Chan | K. C. Chan, M.-C. Chu | Cosmological Constraints on Radion Evolution in the Universal Extra
Dimension Model | 8 pages, 3 figures, comments added, to appear in Phys. Rev. D | Phys.Rev.D77:063525,2008 | 10.1103/PhysRevD.77.063525 | null | astro-ph | null | The constraints on the radion evolution in the Universal Extra Dimension
(UED) model from Cosmic Microwave Background (CMB) and Type Ia supernovae (SNe
Ia) data are studied. In the UED model, where both the gravity and standard
model fields can propagate in the extra dimensions, the evolution of the extra
dimensional volume, the radion, induces variation of fundamental constants. We
discuss the effects of variation of the relevant constants in the context of
UED for CMB power spectrum and SNe Ia data. We then use the three-year WMAP
data to constrain the radion evolution at z \sim 1100, and the 2 \sigma
constraint on \dot{\rho} / \rho_0 (\rho is a function of the radion, to be
defined in the text) is [ -8.8, 6.6] \times 10 ^{-13} yr^-1. The SNe Ia gold
sample yields a constraint on \dot{\rho} / \rho_0, for redshift between 0 and
1, to be [-4.7, 14] \times 10^{-13} yr^-1. Furthermore, the constraints from
SNe Ia can be interpreted as bounds on the evolution QCD scale parameter,
\dot{\Lambda}_{QCD} / \Lambda_{QCD, 0}, [-1.4, 2.8] \times 10^{-11} yr^-1,
without reference to the UED model.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:51:25 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 15:56:41 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Chan",
"K. C.",
""
],
[
"Chu",
"M. -C.",
""
]
] |
0708.0123 | Marco Feroci | M. Feroci, E. Costa, P. Soffitta, E. Del Monte, G. Di Persio, I.
Donnarumma, Y. Evangelista, M. Frutti, I. Lapshov, F. Lazzarotto, M.
Mastropietro, E. Morelli, L. Pacciani, G. Porrovecchio, M. Rapisarda, A.
Rubini, M. Tavani, and A. Argan | SuperAGILE: the hard X-ray Imager for the AGILE space mission | Nucl. Instr. and Meth. A, in press. Full version with figures
included in the text, now available at:
ftp://vesta.rm.iasf.cnr.it/pub/mferoci/ It will also be linked at the
official AGILE web pages | Nucl.Instrum.Meth.A581:728-754,2007 | 10.1016/j.nima.2007.07.147 | null | astro-ph | null | SuperAGILE is a coded mask experiment based on silicon microstrip detectors.
It operates in the 15-45 keV nominal energy range, providing crossed
one-dimensional images of the X-ray sky with an on-axis angular resolution of 6
arcmin, over a field of view in excess of 1 steradian. It was designed as the
hard X-ray monitor of the AGILE space mission, a small satellite of the Italian
Space Agency devoted to image the gamma-ray sky in the 30 MeV - 50 GeV energy
band. The AGILE mission was launched in a low-earth orbit on 23^{rd} April
2007. In this paper we describe the SuperAGILE experiment, its construction and
test processes, and its performance before flight, based on the on-ground test
and calibrations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 10:59:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Feroci",
"M.",
""
],
[
"Costa",
"E.",
""
],
[
"Soffitta",
"P.",
""
],
[
"Del Monte",
"E.",
""
],
[
"Di Persio",
"G.",
""
],
[
"Donnarumma",
"I.",
""
],
[
"Evangelista",
"Y.",
""
],
[
"Frutti",
"M.",
""
],
[
"Lapshov",
"I.",
""
],
[
"Lazzarotto",
"F.",
""
],
[
"Mastropietro",
"M.",
""
],
[
"Morelli",
"E.",
""
],
[
"Pacciani",
"L.",
""
],
[
"Porrovecchio",
"G.",
""
],
[
"Rapisarda",
"M.",
""
],
[
"Rubini",
"A.",
""
],
[
"Tavani",
"M.",
""
],
[
"Argan",
"A.",
""
]
] |
0708.0124 | A. B. Tsybakov | A. B. Tsybakov | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher
complexities and oracle inequalities in risk minimization'' by V.
Koltchinskii | Published at http://dx.doi.org/10.1214/009053606000001064 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, 2681-2687 | 10.1214/009053606000001064 | IMS-AOS-AOS0195E | q-fin.RM math.ST stat.TH | null | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization'' by V. Koltchinskii [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:09:36 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Tsybakov",
"A. B.",
""
]
] |
0708.0125 | Fethi Mahmoudi | Fethi Mahmoudi, Andrea Malchiodi and Marcelo Montenegro | Solutions to the nonlinear Schroedinger equation carrying momentum along
a curve. Part I: study of the limit set and approximate solutions | 44 pages, 2 figures | null | null | null | math.AP | null | We prove existence of a special class of solutions to the (elliptic)
Nonlinear Schroeodinger Equation $- \epsilon^2 \Delta \psi + V(x) \psi =
|\psi|^{p-1} \psi$, on a manifold or in the Euclidean space. Here V represents
the potential, p an exponent greater than 1 and $\epsilon$ a small parameter
corresponding to the Planck constant. As $\epsilon$ tends to zero (namely in
the semiclassical limit) we prove existence of complex-valued solutions which
concentrate along closed curves, and whose phase is highly oscillatory.
Physically, these solutions carry quantum-mechanical momentum along the limit
curves. In this first part we provide the characterization of the limit set,
with natural stationarity and non-degeneracy conditions. We then construct an
approximate solution up to order $\epsilon^2$, showing that these conditions
appear naturally in a Taylor expansion of the equation in powers of $\epsilon$.
Based on these, an existence result will be proved in the second part.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:09:58 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Mahmoudi",
"Fethi",
""
],
[
"Malchiodi",
"Andrea",
""
],
[
"Montenegro",
"Marcelo",
""
]
] |
0708.0126 | Mohammed Allalen Dr | Mohammed Allalen, Tarik Mehaddene, and Hamid Bouzar | Monte Carlo simulations of the L10 long-range order relaxation in
dimensionally reduced systems | 10 pages, and 7 figures | J. Phys: Condens. Matter 19 No3 (2007) 036218 | 10.1088/0953-8984/19/3/036218 | null | cond-mat.soft cond-mat.mtrl-sci | null | Monte Carlo simulations have been performed to investigate the relaxation of
the L10 long-range order in dimensionally reduced systems. The effect of the
number of (001)-type monatomic layers and of the pair interaction energies on
these kinetics has been examined. The vacancy migration energies have been
deduced from the Arrhenius plots of the relaxation times. A substantial
increase in the migration energy for small film thickness is observed. The
results agree with previous Monte Carlo simulations and with recent
experimental results in L1_0 thin films and multilayers.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:12:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Allalen",
"Mohammed",
""
],
[
"Mehaddene",
"Tarik",
""
],
[
"Bouzar",
"Hamid",
""
]
] |
0708.0127 | Takeo Hoshi | Takeo Hoshi | Accuracy control in ultra-large-scale electronic structure calculation | 8 pages, 3 figures. To appear in J.Phys. Condens. Matter. A preprint
PDF file in better graphics is available at
http://fujimac.t.u-tokyo.ac.jp/lses/index_e.html | J. Phys.: Condens. Matter 19, 365243, 7pp (2007) | 10.1088/0953-8984/19/36/365243 | null | cond-mat.mtrl-sci | null | Numerical aspects are investigated in ultra-large-scale electronic structure
calculation. Accuracy control methods in process (molecular-dynamics)
calculation are focused. Flexible control methods are proposed so as to control
variational freedoms, automatically at each time step, within the framework of
generalized Wannier state theory. The method is demonstrated in silicon
cleavage simulation with 10^2-10^5 atoms. The idea is of general importance
among process calculations and is also used in Krylov subspace theory, another
large-scale-calculation theory.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:14:30 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Hoshi",
"Takeo",
""
]
] |
0708.0128 | Alessandra Faggionato | A. Faggionato | The alternating marked point process of h-slopes of the drifted Brownian
motion | 28 pages, 4 figures | null | null | null | math.PR math-ph math.MP | null | We show that the slopes between h-extrema of the drifted 1D Brownian motion
form a stationary alternating marked point process, extending the result of J.
Neveu and J. Pitman for the non drifted case. Our analysis covers the results
on the statistics of h-extrema obtained by P. Le Doussal, C. Monthus and D.
Fisher via a Renormalization Group analysis and gives a complete description of
the slope between h-extrema covering the origin by means of the Palm--Khinchin
theory. Moreover, we analyze the behavior of the Brownian motion near its
h-extrema.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:15:39 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Faggionato",
"A.",
""
]
] |
0708.0129 | Shigeru Kasahara | S. Kasahara, H. Fujii, T. Mochiku, H. Takeya, K. Hirata | Low temperature specific heat of La_{3}Pd_{4}Ge_{4} with
U_{3}Ni_{4}Si_{4}-type structure | null | J. Phys.: Condens. Matter 20, 385204 (2008) | 10.1088/0953-8984/20/38/385204 | null | cond-mat.supr-con | null | Low temperature specific heat has been investigated in a novel ternary
superconductor La_{3}Pd_{4}Ge_{4} with an U_{3}Ni_{4}Si_{4}-type structure
consisting of the alternating BaAl_{4} (ThCr_{2}Si_{2})- and AlB$_{2}$-type
layers. A comparative study with the related ThCr_{2}Si_{2}-type superconductor
LaPd_{2}Ge_{2}, one of the layers in La_{3}Pd_{4}Ge_{4}, is also presented.
From the normal state specific heat, the Sommerfeld coefficient $\gamma_{n} =
27.0$ mJ/mol K^2 and the Debye temperature $\Theta_{\rm D}$ = 256 K are derived
for the La_{3}Pd_{4}Ge_{4}, while those for the LaPd_{2}Ge_{2} are $\gamma_{n}
=8.26$ mJ/mol K^2 and $\Theta_{\rm D}$ = 291 K. The La_{3}Pd_{4}Ge_{4} has
moderately high electronic density of state at the Fermi level. Electronic
contribution on the specific heat, $C_{\rm el}$, in each compound is well
described by the BCS behavior, suggesting that both of the La_{3}Pd_{4}Ge_{4}
and the LaPd_{2}Ge_{2} have fully opened isotropic gap in the superconducting
state.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:21:31 GMT"
}
] | 2014-11-13T00:00:00 | [
[
"Kasahara",
"S.",
""
],
[
"Fujii",
"H.",
""
],
[
"Mochiku",
"T.",
""
],
[
"Takeya",
"H.",
""
],
[
"Hirata",
"K.",
""
]
] |
0708.0130 | Chris Peters | Chris Peters | Lowest Weights in Cohomology of Variations of Hodge Structure | 9 pages | null | null | null | math.AG math.CV | null | Let X be a smooth complex projective variety, let $j:U\into X$ an immersion
of a Zariski open subset, and let V be a variation of Hodge structure of weight
n over U. Then IH^k(X, j_*V) is known to carry a pure Hodge structure of weight
k+n, while H^k(U,V) carries a mixed Hodge structure of weight $\ge k+n$. In
this note it is shown that the image of the natural map $IH^k(X,j_*V) \to
H^k(U,V)$ is the lowest weight part of this mixed Hodge structure. The proof
uses Saito's theory of mixed Hodge modules.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:17:09 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 18:29:44 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Peters",
"Chris",
""
]
] |
0708.0131 | Veronica Dexheimer | V.A. Dexheimer, C.A.Z. Vasconcellos, B.E.J. Bodmann | On the Density Dependent Nuclear Matter Compressibility | null | Phys.Rev.C77:065803,2008 | 10.1103/PhysRevC.77.065803 | null | astro-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we apply a quantum hadrodynamic effective model in the
mean-field approximation to the description of neutron stars. We consider an
adjustable derivative-coupling model and study the parameter influence on the
dynamics of the system by analyzing the full range of values they can take. We
establish a set of parameters which define a specific model that is able to
describe phenomenological properties such as the effective nucleon mass at
saturation as well as global static properties of neutron stars (mass and
radius). If one uses observational data to fix the maximum mass for neutron
stars by a specific model, we are able to predict the compression modulus of
nuclear matter K = 257,2MeV.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:25:54 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jul 2008 12:15:36 GMT"
}
] | 2009-02-17T00:00:00 | [
[
"Dexheimer",
"V. A.",
""
],
[
"Vasconcellos",
"C. A. Z.",
""
],
[
"Bodmann",
"B. E. J.",
""
]
] |
0708.0132 | Sara van de Geer | Sara van de Geer | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher
complexities and oracle inequalities in risk minimization'' by V.
Koltchinskii | Published at http://dx.doi.org/10.1214/009053606000001073 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, 2688-2696 | 10.1214/009053606000001073 | IMS-AOS-AOS0195F | q-fin.RM math.ST stat.TH | null | Discussion of ``2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization'' by V. Koltchinskii [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 11:28:07 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"van de Geer",
"Sara",
""
]
] |
0708.0133 | Milena Benedettini | Milena Benedettini, Serena Viti, Claudio Codella, Rafael Bachiller,
Frederic Gueth, Maria T. Beltr\`an, Anne Dutrey, Stephane Guilloteau | The clumpy structure of the chemically active L1157 outflow | 11 pages, 8 figures, accepted for publication in the MNRAS | null | 10.1111/j.1365-2966.2007.12300.x | null | astro-ph | null | We present high spatial resolution maps, obtained with the Plateau de Bure
Interferometer, of the blue lobe of the L1157 outflow. We observed four lines
at 3 mm, namely CH3OH (2_K-1_K), HC3N (11-10), HCN (1-0) and OCS (7-6).
Moreover, the bright B1 clump has also been observed at better spatial
resolution in CS (2-1), CH3OH (2_1-1_1)A-, and 34SO (3_2-2_1). These high
spatial resolution observations show a very rich structure in all the tracers,
revealing a clumpy structure of the gas superimposed to an extended emission.
In fact, the three clumps detected by previous IRAM-30m single dish
observations have been resolved into several sub-clumps and new clumps have
been detected in the outflow. The clumps are associated with the two cavities
created by two shock episodes driven by the precessing jet. In particular, the
clumps nearest the protostar are located at the walls of the younger cavity
with a clear arch-shape form while the farthest clumps have slightly different
observational characteristics indicating that they are associated to the older
shock episode. The emission of the observed species peaks in different part of
the lobe: the east clumps are brighter in HC3N (11-10), HCN (1-0) and CS (2-1)
while the west clumps are brighter in CH3OH(2_K-1_K), OCS (7-6) and 34SO
(3_2-2_1). This peak displacement in the line emission suggests a variation of
the physical conditions and/or the chemical composition along the lobe of the
outflow at small scale, likely related to the shock activity and the precession
of the outflow. In particular, we observe the decoupling of the silicon
monoxide and methanol emission, common shock tracers, in the B1 clump located
at the apex of the bow shock produced by the second shock episode.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:06:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Benedettini",
"Milena",
""
],
[
"Viti",
"Serena",
""
],
[
"Codella",
"Claudio",
""
],
[
"Bachiller",
"Rafael",
""
],
[
"Gueth",
"Frederic",
""
],
[
"Beltràn",
"Maria T.",
""
],
[
"Dutrey",
"Anne",
""
],
[
"Guilloteau",
"Stephane",
""
]
] |
0708.0134 | Nikolaos Mavromatos | Nikolaos E. Mavromatos (King's College London) | LHC Physics and Cosmology | 49 pages Latex, 25 EPS figures incorporated, uses special macros.
Lectures presented at the Lake Louise Winter Institute 2007 (Lake Louise
(Canada), February 19-24 2007) | null | 10.1142/9789812776105_0004 | null | hep-ph astro-ph hep-th | null | In these Lectures I review possible constraints on particle physics models,
obtained by means of combining the results of collider measurements with
astrophysical data. I emphasize the theoretical-model dependence of these
results. I discuss supersymmetric dark matter constraints at colliders (mainly
LHC) in various theoretical contexts: the standard
Cosmological-Constant-Cold-Dark-Matter (Lambda-CDM) model,
(super)string-inspired ones and non-equilibrium relaxation dark energy models.
I then investigate the capability of LHC measurements in asserting whether
supersymmetric matter (if discovered) constitutes part, or all, of the
astrophysical dark matter. I also discuss prospects for improving the
constraints in future precision facilities, such as the International Linear
Collider.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:09:49 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Mavromatos",
"Nikolaos E.",
"",
"King's College London"
]
] |
0708.0135 | Vladimir Koltchinskii | Vladimir Koltchinskii | Rejoinder: 2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization | Published at http://dx.doi.org/10.1214/009053606000001082 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, 2697-2706 | 10.1214/009053606000001082 | IMS-AOS-AOS0195REJ | math.ST stat.TH | null | Rejoinder: 2004 IMS Medallion Lecture: Local Rademacher complexities and
oracle inequalities in risk minimization [arXiv:0708.0083]
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:10:53 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Koltchinskii",
"Vladimir",
""
]
] |
0708.0136 | Martin Svensson Dr | Sigmundur Gudmundsson, Martin Svensson | Harmonic morphisms from solvable Lie groups | null | null | null | null | math.DG | null | In this paper we introduce two new methods for constructing harmonic
morphisms from solvable Lie groups. The first method yields global solutions
from any simply connected nilpotent Lie group and from any Riemannian symmetric
space of non-compact type and rank $r\ge 3$. The second method provides us with
global solutions from any Damek-Ricci space and many non-compact Riemannian
symmetric spaces. We then give a continuous family of 3-dimensional solvable
Lie groups not admitting any complex valued harmonic morphisms, not even
locally.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:13:42 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Sep 2007 16:20:32 GMT"
}
] | 2007-09-05T00:00:00 | [
[
"Gudmundsson",
"Sigmundur",
""
],
[
"Svensson",
"Martin",
""
]
] |
0708.0137 | Michael Hauer | M.I. Gorenstein, M. Hauer, O.N. Moroz | Viscosity in the excluded volume hadron gas model | 12 pages, 3 figures | Phys.Rev.C77:024911,2008 | 10.1103/PhysRevC.77.024911 | null | nucl-th hep-ph | null | The shear viscosity $\eta$ in the van der Waals excluded volume
hadron-resonance gas model is considered. For the shear viscosity the result of
the non-relativistic gas of hard-core particles is extended to the mixture of
particles with different masses, but equal values of hard-core radius r. The
relativistic corrections to hadron average momenta in thermal equilibrium are
also taken into account. The ratio of the viscosity $\eta$ to the entropy
density s is studied. It monotonously decreases along the chemical freeze-out
line in nucleus-nucleus collisions with increasing collision energy. As a
function of hard-core radius r, a broad minimum of the ratio $\eta/s\approx
0.3$ near $r \approx 0.5$ fm is found at high collision energies. For the
charge-neutral system at $T=T_c=180$ MeV, a minimum of the ratio $\eta/s\cong
0.24$ is reached for $r\cong 0.53$ fm. To justify a hydrodynamic approach to
nucleus-nucleus collisions within the hadron phase the restriction from below,
$r~ \ge ~0.2$ fm, on the hard-core hadron radius should be fulfilled in the
excluded volume hadron-resonance gas.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:14:02 GMT"
}
] | 2011-12-06T00:00:00 | [
[
"Gorenstein",
"M. I.",
""
],
[
"Hauer",
"M.",
""
],
[
"Moroz",
"O. N.",
""
]
] |
0708.0138 | Nathalie Krell | Nathalie Krell (PMA) | Self-similar branching Markov chains | null | null | null | null | math.PR | null | The main purpose of this work is to study self-similar branching Markov
chains. First we will construct such a process. Then we will establish certain
Limit Theorems using the theory of self-similar Markov processes.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:19:03 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 15:52:41 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Krell",
"Nathalie",
"",
"PMA"
]
] |
0708.0139 | Pamela Morehouse | G. S. Adams, et al (for the CLEO Collaboration) | Suppressed Decays of D_s^+ Mesons to Two Pseudoscalar Mesons | 9 pages postscript,also available through
http://www.lns.cornell.edu/public/CLNS/2007/, Submitted to PRL | Phys.Rev.Lett.99:191805,2007 | 10.1103/PhysRevLett.99.191805 | CLNS 07/2004, CLEO 07-8 | hep-ex | null | Using data collected near the Ds*+ Ds- peak production energy Ecm = 4170 MeV
by the CLEO-c detector, we study the decays of Ds+ mesons to two pseudoscalar
mesons. We report on searches for the singly-Cabibbo-suppressed Ds+ decay modes
K+ eta, K+ eta', pi+ K0S, K+ pi0, and the isospin-forbidden decay mode Ds+ to
pi+ pi0. We normalize with respect to the Cabibbo-favored Ds+ modes pi+ eta,
pi+ eta', and K+ K0S, and obtain ratios of branching fractions: Ds+ to K+ eta /
Ds+ to pi+ eta = (8.9 +- 1.5 +- 0.4)%, Ds+ to K+ eta' / Ds+ to pi+ eta' = (4.2
+- 1.3 +- 0.3)%, Ds+ to pi+ K0S / Ds+ to K+ K0S = (8.2 +- 0.9 +- 0.2)%, Ds+ to
K+ pi0 / Ds+ to K+ K0S = (5.0 +- 1.2 +- 0.6)%, and Ds+ to pi+ pi0 / Ds+ to K+
K0S < 4.1% at 90% CL, where the uncertainties are statistical and systematic,
respectively.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:29:55 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Adams",
"G. S.",
""
]
] |
0708.0140 | Xiaofeng Wang Dr. | Xiaofeng Wang (1,2), Weidong Li (1), Alexei V. Filippenko (1), Kevin
Krisciunas (3), Nicholas B. Suntzeff (3), Junzheng Li (2), Tianmeng Zhang
(4), Jingsong Deng (4), Ryan J. Foley (1), Mohan Ganeshalingam (1), Tipei Li
(2), YuQing Lou (2), Yulei Qiu (4), Rencheng Shang (2), Jeffrey M. Silverman
(1), Shuangnan Zhang (2), and Youhong Zhang (2) ((1) UC Berkeley (2) Tsinghua
University (3) Texas A&M University (4) National Astronomical Observatory of
China) | Optical and Near-Infrared Observations of the Highly Reddened, Rapidly
Expanding Type Ia Supernova 2006X in M100 | 48 pages, 20 figures and 11 tables. Accepted Version (ApJ, 2008,
March issue) | Astrophys.J.675:626-643, 2008 | 10.1086/526413 | null | astro-ph | null | We present extensive optical (UBVRI), near-infrared (JK) light curves and
optical spectroscopy of the Type Ia supernova (SN) 2006X in the nearby galaxy
NGC 4321 (M100). Our observations suggest that either SN 2006X has an
intrinsically peculiar color evolution, or it is highly reddened [E(B -
V)_{host} = 1.42+/-0.04 mag] with R_V = 1.48+/-0.06, much lower than the
canonical value of 3.1 for the average Galactic dust. SN 2006X also has one of
the highest expansion velocities ever published for a SN Ia. Compared with the
other SNe Ia we analyzed, SN 2006X has a broader light curve in the U band, a
more prominent bump/shoulder feature in the V and R bands, a more pronounced
secondary maximum in the I and near-infrared bands, and a remarkably smaller
late-time decline rate in the B band. The B - V color evolution shows an
obvious deviation from the Lira-Phillips relation at 1 to 3 months after
maximum brightness. At early times, optical spectra of SN 2006X displayed
strong, high-velocity features of both intermediate-mass elements (Si, Ca, and
S) and iron-peak elements, while at late times they showed a relatively blue
continuum, consistent with the blue U-B and B-V colors at similar epochs. A
light echo and/or the interaction of the SN ejecta and its circumstellar
material may provide a plausible explanation for its late-time photometric and
spectroscopic behavior. Using the Cepheid distance of M100, we derive a Hubble
constant of 72.7+/-8.2 km s^{-1} Mpc^{-1}(statistical) from the normalized
dereddened luminosity of SN 2006X. We briefly discuss whether abnormal dust is
a universal signature for all SNe Ia, and whether the most rapidly expanding
objects form a subclass with distinct photometric and spectroscopic properties.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:36:42 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 06:01:07 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Aug 2007 07:33:58 GMT"
},
{
"version": "v4",
"created": "Fri, 16 Nov 2007 10:20:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Xiaofeng",
""
],
[
"Li",
"Weidong",
""
],
[
"Filippenko",
"Alexei V.",
""
],
[
"Krisciunas",
"Kevin",
""
],
[
"Suntzeff",
"Nicholas B.",
""
],
[
"Li",
"Junzheng",
""
],
[
"Zhang",
"Tianmeng",
""
],
[
"Deng",
"Jingsong",
""
],
[
"Foley",
"Ryan J.",
""
],
[
"Ganeshalingam",
"Mohan",
""
],
[
"Li",
"Tipei",
""
],
[
"Lou",
"YuQing",
""
],
[
"Qiu",
"Yulei",
""
],
[
"Shang",
"Rencheng",
""
],
[
"Silverman",
"Jeffrey M.",
""
],
[
"Zhang",
"Shuangnan",
""
],
[
"Zhang",
"Youhong",
""
]
] |
0708.0141 | Chris Lee | Chris J. Lee, Peter J. M. van der Slot, and Klaus. -J. Boller | Using ultra-short pulses to determine particle size and density
distributions | 15 pages, 29 figures, accepted for publication in Optics Express will
update with full reference when it is available | null | 10.1364/OE.15.012483 | null | physics.optics | null | We analyze the time dependent response of strongly scattering media (SSM) to
ultra-short pulses of light. A random walk technique is used to model the
optical scattering of ultra-short pulses of light propagating through media
with random shapes and various packing densities. The pulse spreading was found
to be strongly dependent on the average particle size, particle size
distribution, and the packing fraction. We also show that the intensity as a
function of time-delay can be used to analyze the particle size distribution
and packing fraction of an optically thick sample independently of the presence
of absorption features. Finally, we propose an all new way to measure the shape
of ultra-short pulses that have propagated through a SSM.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:06:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lee",
"Chris J.",
""
],
[
"van der Slot",
"Peter J. M.",
""
],
[
"Boller",
"Klaus. -J.",
""
]
] |
0708.0142 | John Hauptman | Sung Keun Park, Franco Grancagnolo, John Hauptman, Alexander
Mikhailichenko, and Nural Akchurin | The 4th Concept Detector for the International Linear Collider | 9 pages, 7 figures, for Session 14 of Lepton-Photon at Daegu | null | null | null | hep-ex | null | The 4th Concept detector presently being designed for the International
Linear Collider introduces several innovations in order to achieve the
necessary experimental goal of a detecter that is 2-to-10 times better than the
already excellent SLC and LEP detectors. We introduce a dual-readout
calorimeter system, a cluster counting drift chamber, and a second solenoid to
return the magnetic flux without iron. We discuss particle identification,
momentum and energy resolutions, and the machine-detector interface that
together offer the possibility of a very high-performance detector for
e^+e^-physics up to $\sqrt{s} = 1$ TeV.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 03:41:03 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Aug 2007 18:42:32 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Park",
"Sung Keun",
""
],
[
"Grancagnolo",
"Franco",
""
],
[
"Hauptman",
"John",
""
],
[
"Mikhailichenko",
"Alexander",
""
],
[
"Akchurin",
"Nural",
""
]
] |
0708.0143 | Rainer Dahlhaus | Rainer Dahlhaus, Wolfgang Polonik | Nonparametric quasi-maximum likelihood estimation for Gaussian locally
stationary processes | Published at http://dx.doi.org/10.1214/009053606000000867 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, 2790-2824 | 10.1214/009053606000000867 | IMS-AOS-AOS0138 | math.ST stat.TH | null | This paper deals with nonparametric maximum likelihood estimation for
Gaussian locally stationary processes. Our nonparametric MLE is constructed by
minimizing a frequency domain likelihood over a class of functions. The
asymptotic behavior of the resulting estimator is studied. The results depend
on the richness of the class of functions. Both sieve estimation and global
estimation are considered. Our results apply, in particular, to estimation
under shape constraints. As an example, autoregressive model fitting with a
monotonic variance function is discussed in detail, including algorithmic
considerations. A key technical tool is the time-varying empirical spectral
process indexed by functions. For this process, a Bernstein-type exponential
inequality and a central limit theorem are derived. These results for empirical
spectral processes are of independent interest.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:50:32 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Dahlhaus",
"Rainer",
""
],
[
"Polonik",
"Wolfgang",
""
]
] |
0708.0144 | Tuomas Savolainen | T. Savolainen (1,2), K. Wiik (2), E. Valtaoja (2), M. Tornikoski (3)
((1) MPIfR - Germany, (2) Tuorla Observatory, University of Turku - Finland,
(3) Mets\"ahovi Radio Observatory, Helsinki University of Technology -
Finland) | Magnetic Field Structure in the Parsec Scale Jet of 3C273 from
Multifrequency VLBA Observations | 7 pages, to appear in "Extragalactic Jets: Theory and Observation
from Radio to Gamma Ray", eds. T. A. Rector and D. S. De Young, ASP
conference series | null | null | null | astro-ph | null | We present first results from a multifrequency VLBA observations of 3C273 in
2003. The source was observed simultaneously at 5.0, 8.4, 15.3, 22.2, 43.2 and
86.2 GHz, and from this multifrequency data set, spectra of 16 emission
features in the parsec scale jet were carefully constructed by using a new
model-fitting based method. The measured spectra and sizes of the emission
features were used to calculate the magnetic field density and the energy
density of the relativistic electrons in the different parts of the parsec
scale jet, independent of any equipartition assumption. We measure magnetic
field density of an order of 1 Gauss in the core. The magnetic energy density
in the core dominates over that of the relativistic electrons, while in the
downstream region our data are roughly consistent with an equipartition. A
strong gradient in the magnetic field density across the jet width, coincident
with a transverse velocity structure at about 1.5 mas from the core, was found:
the slower superluminal component B2 on the northern side of the jet has a
magnetic field density two orders of magnitude lower than the faster southern
components B3 and B4.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:56:57 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Savolainen",
"T.",
""
],
[
"Wiik",
"K.",
""
],
[
"Valtaoja",
"E.",
""
],
[
"Tornikoski",
"M.",
""
]
] |
0708.0145 | Alexander Yu. Vlasov | Alexander Yu. Vlasov (FRC/IRH) | Programmable Quantum State Transfer | 4+ pages, 2 columns, revtex4; v2 some clarification, couple new
examples and references | null | null | null | quant-ph | null | A programmable quantum networks model is used in this paper for development
of methods of control of a quantum state transport. These methods may be
applied for a wide variety of patterns of controlled state transmission and
spreading in quantum systems. The programmable perfect state transfer and
quantum walk, mobile quantum (ro)bots and lattice gas automata may be described
by unified way with such approach.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:57:27 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 12:37:56 GMT"
}
] | 2007-09-12T00:00:00 | [
[
"Vlasov",
"Alexander Yu.",
"",
"FRC/IRH"
]
] |
0708.0146 | Gerald Cecil | Gerald Cecil and Dmitry Rashkeev (University of North Carolina at
Chapel Hill) | A Side of Mercury Not Seen By Mariner 10 | 7 pages, 4 PDF figures, pdfLaTeX, typos corrected, Fig. 2 modified
slightly to add crater diameters not given in published version | Astron.J.134:1468-1474,2007 | 10.1086/521703 | null | astro-ph | null | More than 60,000 images of Mercury were taken at ~29 deg elevation during two
sunrises, at 820 nm, and through a 1.35 m diameter off-axis aperture on the
SOAR telescope. The sharpest resolve 0.2" (140 km) and cover 190-300 deg
longitude -- a swath unseen by the Mariner 10 spacecraft -- at complementary
phase angles to previous ground-based optical imagery. Our view is comparable
to that of the Moon through weak binoculars. Evident are the large crater
Mozart shadowed on the terminator, fresh rayed craters, and other albedo
features keyed to topography and radar reflectivity, including the putative
huge ``Basin S'' on the limb. Classical bright feature Liguria resolves across
the northwest boundary of the Caloris basin into a bright splotch centered on a
sharp, 20 km diameter radar crater, and is the brightest feature within a
prominent darker ``cap'' (Hermean feature Solitudo Phoenicis) that covers the
northern hemisphere between longitudes 140-250 deg. The cap may result from
space weathering that darkens via a magnetically enhanced flux of the solar
wind, or that reddens low latitudes via high solar insolation.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:13:48 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Oct 2007 19:10:59 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cecil",
"Gerald",
"",
"University of North Carolina at\n Chapel Hill"
],
[
"Rashkeev",
"Dmitry",
"",
"University of North Carolina at\n Chapel Hill"
]
] |
0708.0147 | Valentin Flunkert | Thomas Dahms, Philipp Hoevel, Eckehard Schoell | Control of unstable steady states by extended time-delayed feedback | 11 pages, 16 figures | null | 10.1103/PhysRevE.76.056201 | null | nlin.CD | null | Time-delayed feedback methods can be used to control unstable periodic orbits
as well as unstable steady states. We present an application of extended time
delay autosynchronization introduced by Socolar et al. to an unstable focus.
This system represents a generic model of an unstable steady state which can be
found for instance in a Hopf bifurcation. In addition to the original
controller design, we investigate effects of control loop latency and a
bandpass filter on the domain of control. Furthermore, we consider coupling of
the control force to the system via a rotational coupling matrix parametrized
by a variable phase. We present an analysis of the domain of control and
support our results by numerical calculations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:14:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dahms",
"Thomas",
""
],
[
"Hoevel",
"Philipp",
""
],
[
"Schoell",
"Eckehard",
""
]
] |
0708.0148 | Chris Done | Chris Done, Marek Gierlinski, Aya Kubota | Modelling the behaviour of accretion flows in X-ray binaries | 76 pages, accepted for publication in Astronomy and Astrophysics
Reviews | Astron.Astrophys.Rev.15:1-66,2007 | 10.1007/s00159-007-0006-1 | null | astro-ph | null | (abridged) We review how the recent increase in X-ray and radio data from
black hole and neutron star binaries can be merged together with theoretical
advances to give a coherent picture of the physics of the accretion flow in
strong gravity. Both long term X-ray light curves, X-ray spectra, the rapid
X-ray variability and the radio jet behaviour are consistent with a model where
a standard outer accretion disc is truncated at low luminosities, being
replaced by a hot, inner flow which also acts as the launching site of the jet.
Decreasing the disc truncation radius leads to softer spectra, as well as
higher frequencies (including QPO's) in the power spectra, and a faster jet.
The collapse of the hot flow when the disc reaches the last stable orbit
triggers the dramatic decrease in radio flux, as well as giving a qualitative
(and often quantitative) explanation for the major hard--soft spectral
transition seen in black holes and neutron stars.
After collapse of the hot inner flow, the spectrum in black hole systems can
be dominated by the disc emission. Its behaviour is consistent with the
existence of a last stable orbit, and such data can be used to estimate the
black hole spin. These systems can also show very different spectra at these
high luminosities, in which the disc spectrum is strongly distorted by
Comptonization. The structure of the accretion flow becomes increasingly
uncertain as the luminosity approaches (and exceeds) the Eddington luminosity,
though there is growing evidence that winds play an important role. We stress
that these high Eddington fraction flows are key to understanding many
disparate and currently very active fields such as ULX, Narrow Line Seyfert
1's, and the growth of the first black holes in the Early Universe.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 12:59:49 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Done",
"Chris",
""
],
[
"Gierlinski",
"Marek",
""
],
[
"Kubota",
"Aya",
""
]
] |
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