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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.2898 | V. Parameswaran Nair | Dimitra Karabali, V.P. Nair | The robustness of the vacuum wave function and other matters for
Yang-Mills theory | 18 pages | Phys.Rev.D77:025014,2008 | 10.1103/PhysRevD.77.025014 | CCNY-HEP-07/5 | hep-th | null | In the first part of this paper, we present a set of simple arguments to show
that the two-dimensional gauge anomaly and the (2+1)-dimensional Lorentz
symmetry determine the leading Gaussian term in the vacuum wave function of
(2+1)-dimensional Yang-Mills theory. This is to highlight the robustness of the
wave function and its relative insensitivity to the choice of regularizations.
We then comment on the correspondence with the explicit calculations done in
earlier papers. We also make some comments on the nature of the gauge-invariant
configuration space for Euclidean three-dimensional gauge fields (relevant to
(3+1)-dimensional Yang-Mills theory).
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 00:39:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Karabali",
"Dimitra",
""
],
[
"Nair",
"V. P.",
""
]
] |
0705.2899 | Ryan E. Mitchell | R.E. Mitchell (for the CLEO Collaboration) | Bottomonium and Charmonium at CLEO | Proceedings for the QCD session of the XLII Recontres de Moriond,
March 17 - 24, 2007; 6 pages, 5 figures | null | null | null | hep-ex | null | The bottomonium and charmonium systems have long proved to be a rich source
of QCD physics. Recent CLEO contributions in three disparate areas are
presented: (1) the study of quark and gluon hadronization using $\Upsilon$
decays; (2) the interpretation of heavy charmonium states, including
non-$c\bar{c}$ candidates; and (3) the exploration of light quark physics using
the decays of narrow charmonium states as a well-controlled source of light
quark hadrons.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 02:36:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mitchell",
"R. E.",
"",
"for the CLEO Collaboration"
]
] |
0705.2900 | Sergey Kovalenko | Edson Carquin, Yuri Ivanov, Sergey Kovalenko, Ivan Schmidt | Lepton Flavor Violating Photoleptonic Effect | 6 pages, 1 figure, RevTeX 4 | Phys.Rev.D76:016002,2007 | 10.1103/PhysRevD.76.016002 | null | hep-ph | null | We study lepton flavor violating analogs of the photoelectric effect, with a
final $\mu$ or $\tau$ instead of an electron: $\gamma e\to \mu$ and $\gamma
e\to \tau$. On the basis of the general parametrization of the matrix element
of the electromagnetic current we estimate the upper limits for the cross
sections and event rates of these processes, imposed by the current
experimental bounds on $\mu\to e \gamma$ and $\tau\to e \gamma$ decays.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 00:51:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Carquin",
"Edson",
""
],
[
"Ivanov",
"Yuri",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Schmidt",
"Ivan",
""
]
] |
0705.2901 | Yutaka Komiyama | Yutaka Komiyama, Mamoru Doi, Hisanori Furusawa, Masaru Hamabe, Katsumi
Imi, Masahiko Kimura, Satoshi Miyazaki, Fumiaki Nakata, Norio Okada, Sadanori
Okamura, Masami Ouchi, Maki Sekiguchi, Kazuhiro Shimasaku, Masafumi Yagi,
Naoki Yasuda | Wide-field Survey around Local Group Dwarf Spheroidal Galaxy Leo II:
Spatial Distribution of Stellar Content | Accepted for publication in AJ | Astron.J.134:835-845,2007 | 10.1086/519955 | null | astro-ph | null | We carried out a wide-field V, I imaging survey of the Local Group dwarf
spheroidal galaxy Leo II using the Subaru Prime Focus Camera on the 8.2-m
Subaru Telescope. The survey covered an area of 26.67 x 26.67 arcmin^2, far
beyond the tidal radius of Leo II (8.63 arcmin), down to the limiting magnitude
of V ~26, which is roughly 1 mag deeper than the turn-off point of the main
sequence stars of Leo II. Radial number density profiles of bright and faint
red giant branch (RGB) stars were found to change their slopes at around the
tidal radius, and extend beyond the tidal radius with shallower slopes. A
smoothed surface brightness map of Leo II suggests the existence of a small
substructure of globular cluster luminosity beyond the tidal radius. We
investigated the properties of the stellar population by means of the
color-magnitude diagram. The horizontal branch (HB) morphology index shows a
radial gradient in which red HB stars are more concentrated than blue HB stars,
which is common to many Local Group dwarf spheroidal galaxies. The color
distribution of RGB stars around the mean RGB sequence shows a larger
dispersion at the center than in the outskirts, indicating a mixture of stellar
populations at the center and a more homogeneous population in the outskirts.
Based on the age estimation using subgiant branch (SGB) stars, we found that
although the major star formation took place ~8 Gyr ago, a considerable stellar
population younger than 8 Gyr is found at the center; such a younger population
is insignificant in the outskirts.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 01:49:15 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Komiyama",
"Yutaka",
""
],
[
"Doi",
"Mamoru",
""
],
[
"Furusawa",
"Hisanori",
""
],
[
"Hamabe",
"Masaru",
""
],
[
"Imi",
"Katsumi",
""
],
[
"Kimura",
"Masahiko",
""
],
[
"Miyazaki",
"Satoshi",
""
],
[
"Nakata",
"Fumiaki",
""
],
[
"Okada",
"Norio",
""
],
[
"Okamura",
"Sadanori",
""
],
[
"Ouchi",
"Masami",
""
],
[
"Sekiguchi",
"Maki",
""
],
[
"Shimasaku",
"Kazuhiro",
""
],
[
"Yagi",
"Masafumi",
""
],
[
"Yasuda",
"Naoki",
""
]
] |
0705.2902 | Eun-Ah Kim | Eddy Ardonne and Eun-Ah Kim | Non-Abelian statistics in the interference noise of the Moore-Read
quantum Hall state | 4 pages, 4 figures v2: typo's corrected, discussions clarified,
references added | J. Stat. Mech. (2008) L04001 | 10.1088/1742-5468/2008/04/L04001 | null | cond-mat.mes-hall | null | We propose noise oscillation measurements in a double point contact,
accessible with current technology, to seek for a signature of the non-abelian
nature of the \nu=5/2 quantum Hall state. Calculating the voltage and
temperature dependence of the current and noise oscillations, we predict the
non-abelian nature to materialize through a multiplicity of the possible
outcomes: two qualitatively different frequency dependences of the nonzero
interference noise. Comparison between our predictions for the Moore-Read state
with experiments on \nu=5/2 will serve as a much needed test for the nature of
the \nu=5/2 quantum Hall state.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 11:27:51 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Jan 2008 08:32:57 GMT"
}
] | 2008-04-09T00:00:00 | [
[
"Ardonne",
"Eddy",
""
],
[
"Kim",
"Eun-Ah",
""
]
] |
0705.2903 | Alvaro de Souza Dutra | Alvaro de Souza Dutra (UNESP/Campus de Guaratingueta-DFQ) | General solutions for some classes of interacting two field kinks | 14 pages, 3 figures | Phys.Lett.B626:249-255,2005 | 10.1016/j.physletb.2005.08.095 | null | hep-th | null | In this work we present some classes of models whose the corresponding two
coupled first-order nonlinear equations can be put into a linear form, and
consequently be solved completely. In these cases the so-called trial orbit
method is completely unnecessary. We recall that some physically important
models as, for instance, the problem of tiling a plane with a network of
defects and polymer properties are in this class of models.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 02:12:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dutra",
"Alvaro de Souza",
"",
"UNESP/Campus de Guaratingueta-DFQ"
]
] |
0705.2904 | Shun Watanabe | Shun Watanabe, Ryutaroh Matsumoto, Tomohiko Uyematsu, Yasuhito Kawano | Key rate of quantum key distribution with hashed two-way classical
communication | RevTex, 19 pages, 2 figures, to be presented at 2007 IEEE
International Symposium on Information Theory, Appendices E and F are added
in version 2 | Phys. Rev. A 76, 032312 (2007) | 10.1103/PhysRevA.76.032312 | null | quant-ph | null | We propose an information reconciliation protocol that uses two-way classical
communication. In the case of the BB84 protocol and the six-state protocol, the
key rates of the quantum key distribution (QKD) protocols that use our proposed
information reconciliation protocol are higher than previously known protocols
for wide range of error rates. We also clarify the relation between the
proposed protocol and known QKD protocols, and the relation between the
proposed protocol and entanglement distillation protocols (EDPs).
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 05:16:35 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Jun 2007 09:55:34 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Watanabe",
"Shun",
""
],
[
"Matsumoto",
"Ryutaroh",
""
],
[
"Uyematsu",
"Tomohiko",
""
],
[
"Kawano",
"Yasuhito",
""
]
] |
0705.2905 | Tom Chou | Amit Lakhanpal and Tom Chou | Brownian ratchets driven by asymmetric nucleation of hydrolysis waves | 5 pp, 6 figs | Phys. Rev. Lett., 99, 248302, (2007) | 10.1103/PhysRevLett.99.248302 | null | cond-mat.stat-mech cond-mat.soft | null | We propose a stochastic process wherein molecular transport is mediated by
asymmetric nucleation of domains on a one-dimensional substrate. Track-driven
mechanisms of molecular transport arise in biophysical applications such as
Holliday junction positioning and collagenase processivity. In contrast to
molecular motors that hydrolyze nucleotide triphosphates and undergo a local
molecular conformational change, we show that asymmetric nucleation of
hydrolysis waves on a track can also result in directed motion of an attached
particle. Asymmetrically cooperative kinetics between ``hydrolyzed'' and
``unhydrolyzed'' states on each lattice site generate moving domain walls that
push a particle sitting on the track. We use a novel fluctuating-frame,
finite-segment mean field theory to accurately compute steady-state velocities
of the driven particle and to discover parameter regimes which yield maximal
domain wall flux, leading to optimal particle drift.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 02:35:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lakhanpal",
"Amit",
""
],
[
"Chou",
"Tom",
""
]
] |
0705.2906 | Simon Ellingsen | S.P. Ellingsen (1), M.A. Voronkov (2), D.M. Cragg (3), A.M.Sobolev
(4), S.L. Breen (1), P.D. Godfrey (3) ((1) University of Tasmania, (2)
Australia Telescope National Facility/CSIRO, (3) Monash University, (4) Ural
State University) | Investigating high-mass star formation through maser surveys | 5 pages, invited presentation at IAU242 "Astrophysical Masers and
their environments" | null | 10.1017/S1743921307012999 | null | astro-ph | null | Interstellar masers are unique probes of the environments in which they
arise. In studies of high-mass star formation their primary function has been
as signposts of these regions and they have been used as probes of the
kinematics and physical conditions in only a few sources. With a few notable
exceptions, we know relatively little about the evolutionary phase the
different maser species trace, nor their location with respect to other star
formation tracers. While detailed studies of a small number of maser regions
can reveal much about them, other information can only be obtained through
large, systematic searches. In particular, such surveys are vital in efforts to
determine an evolutionary sequence for the common maser species, and there is
growing evidence that methanol masers may trace an earlier phase than the other
common maser species of OH and water.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 02:36:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ellingsen",
"S. P.",
""
],
[
"Voronkov",
"M. A.",
""
],
[
"Cragg",
"D. M.",
""
],
[
"Sobolev",
"A. M.",
""
],
[
"Breen",
"S. L.",
""
],
[
"Godfrey",
"P. D.",
""
]
] |
0705.2907 | Tom Chou | Tom Chou | Peeling and Sliding in Nucleosome Repositioning | 5 pp, 4 figs | Phys. Rev. Lett., 99, 058105, (2007) | 10.1103/PhysRevLett.99.058105 | null | q-bio.SC q-bio.BM | null | We investigate the mechanisms of histone sliding and detachment with a
stochastic model that couples thermally-induced, passive histone sliding with
active motor-driven histone unwrapping. Analysis of a passive loop or twist
defect-mediated histone sliding mechanism shows that diffusional sliding is
enhanced as larger portions of the DNA is peeled off the histone. The mean
times to histone detachment and the mean distance traveled by the motor complex
prior to histone detachment are computed as functions of the intrinsic speed of
the motor. Fast motors preferentially induce detachment over sliding. However,
for a fixed motor speed, increasing the histone-DNA affinity (and thereby
decreasing the passive sliding rate) increases the mean distance traveled by
the motor.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 03:03:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chou",
"Tom",
""
]
] |
0705.2908 | Yi-Fang Chang | Yi-Fang Chang | Negative Matter, Repulsion Force, Dark Matter, Phantom and Theoretical
Test ----Their Relations with Inflation Cosmos and Higgs Mechanism | 16 pages | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First, dark matter is introduced. Next, the Dirac negative energy state is
rediscussed. It is a negative matter with some new characteristics, which are
mainly the gravitation each other, but the repulsion with all positive matter.
Such the positive and negative matters are two regions of topological
separation in general case, and the negative matter is invisible. It is the
simplest candidate of dark matter, and can explain some characteristics of the
dark matter and dark energy. Recent phantom on dark energy is namely a negative
matter. We propose that in quantum fluctuations the positive matter and
negative matter are created at the same time, and derive an inflation cosmos,
which is created from nothing. The Higgs mechanism is possibly a product of
positive and negative matter. Based on a basic axiom and the two foundational
principles of the negative matter, we research its predictions and possible
theoretical tests, in particular, the season effect. The negative matter should
be a necessary development of Dirac theory. Finally, we propose the three basic
laws of the negative matter. The existence of four matters on positive,
opposite, and negative, negative-opposite particles will form the most perfect
symmetrical world.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 02:59:22 GMT"
},
{
"version": "v2",
"created": "Fri, 14 May 2010 02:12:59 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Aug 2011 01:57:24 GMT"
}
] | 2011-08-10T00:00:00 | [
[
"Chang",
"Yi-Fang",
""
]
] |
0705.2909 | Cai-Dian Lu | Cai-Dian Lu, Wei Wang and Yu-Ming Wang (IHEP, Beijing) | Lepton flavor violating processes in unparticle physics | 8 pages, revtex4,with 2 figures, to appear in Phys. Rev. D | Phys.Rev.D76:077701,2007 | 10.1103/PhysRevD.76.077701 | null | hep-ph | null | We study the virtual effects of unparticle physics in the lepton flavor
violating processes $M^0\to l^+l'^-$ and $e^+e^-\to l^+l'^-$ scattering, where
$M^0$ denotes the pseudoscalar mesons: $\pi^0,K_L, D_0,B_0,B_s^0$ and $l,l'$
denote two different lepton flavors. For the decay of $B^0\to l^+l'^-$, there
is no constraint from the current experimental upper bounds on the vector
unparticle coupling with leptons. The constraint on the coupling constant
between scalar unparticle field and leptons is sensitive to the scaling
dimension of the unparticle $d_{\cal U}$. For the scattering process $e^-e^+\to
l^-l'^+$, there is only constraint from experiments on the vector unparticle
couplings with leptons but no constraint on the scalar unparticle. We study the
$\sqrt s$ dependence of the cross section $ \frac{1}{\sigma}
\frac{d\sigma}{d\sqrt s}$ of $e^+e^-\to l^-l'^+$ with different values of
$d_{\cal U}$. If $d_{\cal U}=1.5$, the cross section is independent on the
center mass energy. For $d_{\cal U}>1.5$, the cross section increases with
$\sqrt s$.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 03:49:30 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 13:23:57 GMT"
},
{
"version": "v3",
"created": "Sun, 22 Jul 2007 20:56:26 GMT"
},
{
"version": "v4",
"created": "Mon, 3 Sep 2007 07:52:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lu",
"Cai-Dian",
"",
"IHEP, Beijing"
],
[
"Wang",
"Wei",
"",
"IHEP, Beijing"
],
[
"Wang",
"Yu-Ming",
"",
"IHEP, Beijing"
]
] |
0705.2910 | Katsuaki Asano | Katsuaki Asano and Susumu Inoue | Prompt GeV-TeV Emission of Gamma-Ray Bursts Due to High-Energy Protons,
Muons and Electron-Positron Pairs | 11 pages, 8 figures and 14 appendix figures, accepted for publication
in ApJ vol. 671 with minor revisions | Astrophys.J.671:645-655,2007 | 10.1086/522939 | null | astro-ph | null | In the framework of the internal shock scenario, we model the broadband
prompt emission of gamma-ray bursts (GRBs) with emphasis on the GeV-TeV bands,
utilizing Monte Carlo simulations that include various processes associated
with electrons and protons accelerated to high energies. While inverse Compton
emission from primary electrons is often dominant, different proton-induced
mechanisms can also give rise to distinct high-energy components, such as
synchrotron emission from protons, muons or secondary electrons/positrons
injected via photomeson interactions. In some cases, they give rise to double
spectral breaks that can serve as unique signatures of ultra-high-energy
protons. We discuss the conditions favorable for such emission, and how they
are related to the production of ultra-high-energy cosmic rays and neutrinos in
internal shocks. Ongoing and upcoming observations by {\it GLAST}, atmospheric
Cerenkov telescopes and other facilities will test these expectations and
provide important information on the physical conditions in GRB outflows.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 03:59:34 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 03:57:35 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Sep 2007 05:10:51 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Asano",
"Katsuaki",
""
],
[
"Inoue",
"Susumu",
""
]
] |
0705.2911 | Minzu Wang | M.Z.Wang | Baryonic B Meson Decays | 4 pages, 2 figures, Moriond QCD proceedings | Nucl.Phys.Proc.Suppl.167:182-185,2007 | 10.1016/j.nuclphysbps.2006.12.052 | null | hep-ex | null | Recent results on baryonic B decays from the two b-factories, BABAR and
Belle, are presented. These include studies of B+ to p pbar pi+, B+ to p
Lambdabar gamma and B0 to p Lambdabar pi-; observations of B+ to p Lambdabar
pi0, B to Lambda_c+ Lambda_c- K, and B+ to Xibar0_c Lambda_c+; and study of the
inclusive B decays to Lambda_c.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 04:01:48 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Wang",
"M. Z.",
""
]
] |
0705.2912 | Andrew Preston | H. J. Trodahl, A. R. H. Preston, J. Zhong, B. J. Ruck, (The MacDiarmid
Institute for Advanced Materials and Nanotechnology, School of Chemical and
Physical Sciences, Victoria University, New Zealand) N. Strickland
(Industrial Research Ltd., Lower Hutt, New Zealand) C. Mitra, W. R. L.
Lambrecht (Department of Physics, Case Western Reserve University, Cleveland,
Ohio, USA) | Ferromagnetic redshift of the optical gap in GdN | 5 pages, 4 figures | null | 10.1103/PhysRevB.76.085211 | null | cond-mat.str-el | null | We report measurements of the optical gap in a GdN film at temperatures from
300 to 6K, covering both the paramagnetic and ferromagnetic phases. The gap is
1.31eV in the paramagnetic phase and red-shifts to 0.9eV in the spin-split
bands below the Curie temperature. The paramagnetic gap is larger than was
suggested by very early experiments, and has permitted us to refine a
(LSDA+U)-computed band structure. The band structure was computed in the full
translation symmetry of the ferromagnetic ground state, assigning the
paramagnetic-state gap as the average of the majority- and minority-spin gaps
in the ferromagnetic state. That procedure has been further tested by a band
structure in a 32-atom supercell with randomly-oriented spins. After fitting
only the paramagnetic gap the refined band structure then reproduces our
measured gaps in both phases by direct transitions at the X point.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 04:05:33 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 23:36:17 GMT"
},
{
"version": "v3",
"created": "Fri, 25 May 2007 01:22:31 GMT"
},
{
"version": "v4",
"created": "Mon, 28 May 2007 02:16:02 GMT"
},
{
"version": "v5",
"created": "Mon, 2 Jul 2007 00:50:26 GMT"
},
{
"version": "v6",
"created": "Thu, 12 Jul 2007 01:48:16 GMT"
},
{
"version": "v7",
"created": "Thu, 26 Jul 2007 05:05:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Trodahl",
"H. J.",
"",
"Industrial Research Ltd., Lower Hutt, New Zealand"
],
[
"Preston",
"A. R. H.",
"",
"Industrial Research Ltd., Lower Hutt, New Zealand"
],
[
"Zhong",
"J.",
"",
"Industrial Research Ltd., Lower Hutt, New Zealand"
],
[
"Ruck",
"B. J.",
"",
"Industrial Research Ltd., Lower Hutt, New Zealand"
],
[
"Strickland",
"N.",
"",
"Industrial Research Ltd., Lower Hutt, New Zealand"
],
[
"Mitra",
"C.",
"",
"Department of Physics, Case Western Reserve University, Cleveland,\n Ohio, USA"
],
[
"Lambrecht",
"W. R. L.",
"",
"Department of Physics, Case Western Reserve University, Cleveland,\n Ohio, USA"
]
] |
0705.2913 | Jan Karbowski | Jan Karbowski | Global and regional brain metabolic scaling and its functional
consequences | Brain metabolism scales with its mass well above 3/4 exponent | BMC Biology 5:18 (2007) | null | null | q-bio.NC q-bio.TO | null | Background: Information processing in the brain requires large amounts of
metabolic energy, the spatial distribution of which is highly heterogeneous
reflecting complex activity patterns in the mammalian brain.
Results: Here, it is found based on empirical data that, despite this
heterogeneity, the volume-specific cerebral glucose metabolic rate of many
different brain structures scales with brain volume with almost the same
exponent around -0.15. The exception is white matter, the metabolism of which
seems to scale with a standard specific exponent -1/4. The scaling exponents
for the total oxygen and glucose consumptions in the brain in relation to its
volume are identical and equal to $0.86\pm 0.03$, which is significantly larger
than the exponents 3/4 and 2/3 suggested for whole body basal metabolism on
body mass.
Conclusions: These findings show explicitly that in mammals (i)
volume-specific scaling exponents of the cerebral energy expenditure in
different brain parts are approximately constant (except brain stem
structures), and (ii) the total cerebral metabolic exponent against brain
volume is greater than the much-cited Kleiber's 3/4 exponent. The
neurophysiological factors that might account for the regional uniformity of
the exponents and for the excessive scaling of the total brain metabolism are
discussed, along with the relationship between brain metabolic scaling and
computation.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 04:13:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Karbowski",
"Jan",
""
]
] |
0705.2914 | Mikolaj Cwiok | Mikolaj Cwiok (for the CDF and D0 Collaborations) | Latest Jet Results from the Tevatron | 4 pages, 5 figures, to appear in the proceedings of 42nd Recontres de
Moriond on QCD and high energy hadronic interactions, La Thuile, Aosta
Valley, Italy, 17-24 March 2007 | null | null | FERMILAB-CONF-07-208-E | hep-ex | null | Recent QCD jet production measurements in p-pbar collisions at sqrt(s)=1.96
TeV at the Tevatron Collider at Fermilab are presented. Preliminary: inclusive
jet, dijet, isolated photon + jet and Z + jets measurements are compared to
available perturbative QCD models.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 04:49:49 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Cwiok",
"Mikolaj",
"",
"for the CDF and D0 Collaborations"
]
] |
0705.2915 | Alexander Yong | Hugh Thomas, Alexander Yong | A jeu de taquin theory for increasing tableaux, with applications to
K-theoretic Schubert calculus | 22 pages; v2 has edits to references; v3 has significant
revisions/corrections, as well as new results | Algebra Number Theory 3 (2009), no. 2, 121--148. | null | null | math.CO math.AG | null | We introduce a theory of jeu de taquin for increasing tableaux, extending
fundamental work of [Sch\"{u}tzenberger '77] for standard Young tableaux. We
apply this to give a new combinatorial rule for the K-theory Schubert calculus
of Grassmannians via K-theoretic jeu de taquin, providing an alternative to the
rules of [Buch '02] and others. This rule naturally generalizes to give a
conjectural root-system uniform rule for any minuscule flag variety G/P,
extending [Thomas-Yong '06]. We also present analogues of results of Fomin,
Haiman, Schensted and Sch\"{u}tzenberger.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 16:06:48 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jul 2007 14:25:09 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Sep 2007 18:47:46 GMT"
}
] | 2010-02-17T00:00:00 | [
[
"Thomas",
"Hugh",
""
],
[
"Yong",
"Alexander",
""
]
] |
0705.2916 | Shintaro Sawayama | Shintaro Sawayama | Problem of the time and static restriction in quantum gravity | 5 pages, no figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the time is one of the open issues in the quantum gravity.
This problem is particular problem in the canonical quantum gravity. Even in
the loop gravity the problem of the time remain. Our work is concerning to the
problem of the time. The Wheeler-DeWitt itself contains time evolution part,
but which part is the time evolution part is open issue. However, we can create
a method that seems to solve this problem that is up-to-down method created in
the previous works. We can derive equation relating to the time and static
restriction in this paper. As a example we treat the problem of the time of the
Friedmann universe. And we derive the static restriction in quantum gravity.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 05:39:12 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 04:22:01 GMT"
},
{
"version": "v3",
"created": "Sat, 9 Jun 2007 12:33:48 GMT"
},
{
"version": "v4",
"created": "Fri, 28 Nov 2008 06:03:18 GMT"
},
{
"version": "v5",
"created": "Wed, 11 Feb 2009 17:37:59 GMT"
}
] | 2009-02-11T00:00:00 | [
[
"Sawayama",
"Shintaro",
""
]
] |
0705.2917 | Masashi Wakamatsu | M. Wakamatsu | Comparative analysis of the transversities and the longitudinally
polarized distribution functions of the nucleon | 12 pages, 2 figures | Phys.Lett.B653:398-403,2007 | 10.1016/j.physletb.2007.08.013 | OU-HET-582 | hep-ph hep-ex | null | A first empirical extraction of the transversity distributions for the $u$-
and $d$-quarks has been done by Anselmino {\it et al.} based on the combined
global analysis of the measured azimuthal asymmetries in semi-inclusive deep
inelastic scatterings and those in $e^+ e^- \to h_1 h_2 X$ processes. Although
with large uncertainties, the determined transversity distributions already
appear to reveal a remarkable qualitative difference with the corresponding
longitudinally polarized distributions. We point out that this difference
contains very important information on internal spin structure of the nucleon.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 05:40:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wakamatsu",
"M.",
""
]
] |
0705.2918 | Daniel Beltita | Daniel Beltita | Functional analytic background for a theory of infinite-dimensional
reductive Lie groups | 17 pages | null | null | null | math.RT math.DG math.FA | null | Motivated by the interesting and yet scattered developments in representation
theory of Banach-Lie groups, we discuss several functional analytic issues
which should underlie the notion of infinite-dimensional reductive Lie group:
norm ideals, triangular integrals, operator factorizations, and amenability.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 05:41:03 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Beltita",
"Daniel",
""
]
] |
0705.2919 | Maciej Ulas | Maciej Ulas | On arithmetic progressions on genus two curves | 7 pages, to appear in Rocky Mountain Journal of Mathematics | null | null | null | math.NT | null | We study arithmetic progression in the $x$-coordinate of rational points on
genus two curves. As we know, there are two models for the curve $C$ of genus
two: $C: y^2=f_{5}(x)$ or $C: y^2=f_{6}(x)$, where $f_{5}, f_{6}\in\Q[x]$,
$\operatorname{deg}f_{5}=5, \operatorname{deg}f_{6}=6$ and the polynomials
$f_{5}, f_{6}$ do not have multiple roots. First we prove that there exists an
infinite family of curves of the form $y^2=f(x)$, where $f\in\Q[x]$ and
$\operatorname{deg}f=5$ each containing 11 points in arithmetic progression. We
also present an example of $F\in\Q[x]$ with $\operatorname{deg}F=5$ such that
on the curve $y^2=F(x)$ twelve points lie in arithmetic progression. Next, we
show that there exist infinitely many curves of the form $y^2=g(x)$ where
$g\in\Q[x]$ and $\operatorname{deg}g=6$, each containing 16 points in
arithmetic progression. Moreover, we present two examples of curves in this
form with 18 points in arithmetic progression.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 06:12:27 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ulas",
"Maciej",
""
]
] |
0705.2920 | Emily Nurse | Emily Nurse (for the CDF collaboration) | W mass and width measurements at the Tevatron | To appear in the proceedings of 42st Rencontres de Moriond on QCD and
Hadronic interactions, La Thuile, Aosta Valley, Italy, 17-24 March 2007. Four
pages, six figures | null | null | null | hep-ex | null | I present a measurement of the W boson mass (M_W) and width (G_W) using 200
and 350 pb-1 of CDF Run II data respectively. The measurements, performed in
both the electron and muon decay channels, rely on a fit to the W transverse
mass distribution. We measure M_W = 80413 +/- 48 MeV and G_W = 2032 +/- 71 MeV
which represent the world's single most precise measurements to date.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 06:21:53 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Nurse",
"Emily",
"",
"for the CDF collaboration"
]
] |
0705.2921 | George Eleftherakis | G.K Eleftherakis and V.I. Paulsen | Stably isomorphic dual operator algebras | null | null | null | null | math.OA math.FA | null | We prove that two unital dual operator algebras A, B are stably isomorphic if
and only if they are Delta-equivalent, if and only if they have completely
isometric normal representations a, b on Hilbert spaces H, K respectively and
there exists a ternary ring of operators M \subset B(H,K) such that a(A)=[M*
b(B) M]^{-w^*} and b(B)=[M a(A) M*]^{-w^*}.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 06:35:53 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 17:08:45 GMT"
}
] | 2007-10-01T00:00:00 | [
[
"Eleftherakis",
"G. K",
""
],
[
"Paulsen",
"V. I.",
""
]
] |
0705.2922 | Gael Varoquaux | Ga\"el Varoquaux (LCFIO), Nassim Zahzam (ONERA), Walid Chaibi (SYRTE),
Jean-Fran\c{c}ois Cl\'ement (LCFIO), Olivier Carraz (ONERA), Jean-Philippe
Brantut (LCFIO), Robert A. Nyman (LCFIO), Franck Pereira Dos Santos (SYRTE),
Linda Mondin (CNES DCT/SI/OP), Michel Rouz\'e (CNES DCT/SI/OP), Yannick Bidel
(ONERA), Alexandre Bresson (ONERA), Arnaud Landragin (SYRTE), Philippe Bouyer
(LCFIO) | I.C.E.: An Ultra-Cold Atom Source for Long-Baseline Interferometric
Inertial Sensors in Reduced Gravity | null | Rencontres de Moriond Gravitational Waves and Experimental
Gravity, Italie (11/03/2007) | null | null | physics.atom-ph cond-mat.other | null | The accuracy and precision of current atom-interferometric inertialsensors
rival state-of-the-art conventional devices using artifact-based test masses .
Atomic sensors are well suited for fundamental measurements of gravito-inertial
fields. The sensitivity required to test gravitational theories can be achieved
by extending the baseline of the interferometer. The I.C.E.
(Interf\'erom\'etrie Coh\'erente pour l'Espace) interferometer aims to achieve
long interrogation times in compact apparatus via reduced gravity. We have
tested a cold-atom source during airplane parabolic flights. We show that this
environment is compatible with free-fall interferometric measurements using up
to 4 second interrogation time. We present the next-generation apparatus using
degenerate gases for low release-velocity atomic sources in space-borne
experiments.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 06:40:00 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 13:21:07 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Varoquaux",
"Gaël",
"",
"LCFIO"
],
[
"Zahzam",
"Nassim",
"",
"ONERA"
],
[
"Chaibi",
"Walid",
"",
"SYRTE"
],
[
"Clément",
"Jean-François",
"",
"LCFIO"
],
[
"Carraz",
"Olivier",
"",
"ONERA"
],
[
"Brantut",
"Jean-Philippe",
"",
"LCFIO"
],
[
"Nyman",
"Robert A.",
"",
"LCFIO"
],
[
"Santos",
"Franck Pereira Dos",
"",
"SYRTE"
],
[
"Mondin",
"Linda",
"",
"CNES DCT/SI/OP"
],
[
"Rouzé",
"Michel",
"",
"CNES DCT/SI/OP"
],
[
"Bidel",
"Yannick",
"",
"ONERA"
],
[
"Bresson",
"Alexandre",
"",
"ONERA"
],
[
"Landragin",
"Arnaud",
"",
"SYRTE"
],
[
"Bouyer",
"Philippe",
"",
"LCFIO"
]
] |
0705.2923 | Maxim Dvornikov | Maxim Dvornikov (1 and 2), Timur Rashba (1 and 3) and Victor Semikoz
(1) ((1) IZMIRAN, (2) University of Jyvaskyla, (3) MPI, Muenchen) | Coriolis force corrections to g-mode spectrum in 1D MHD model | RevTeX4, 9 pages, 4 eps figures; accepted for publication in
Astronomy Reports (Astronomicheskii Zhurnal) | Astron.Rep.52:335-342,2008 | 10.1134/S1063772908040082 | null | astro-ph physics.plasm-ph | null | The corrections to g-mode frequencies caused by the presence of a central
magnetic field and rotation of the Sun are calculated. The calculations are
carried out in the simple one dimensional magnetohydrodynamical model using the
approximations which allow one to find the purely analytical spectra of
magneto-gravity waves beyond the scope of the JWKB approximation and avoid in a
small background magnetic field the appearance of the cusp resonance which
locks a wave within the radiative zone. These analytic results are compared
with the satellite observations of the g-mode frequency shifts which are of the
order one per cent as given in the GOLF experiment at the SoHO board. The main
contribution turns out to be the magnetic frequency shift in the strong
magnetic field which obeys the used approximations. In particular, the fixed
magnetic field strength 700 KG results in the mentioned value of the frequency
shift for the g-mode of the radial order n=-10. The rotational shift due to the
Coriolis force appears to be small and does not exceed a fracton of per cent,
\alpha_\Omega < 0.003.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 06:52:28 GMT"
}
] | 2009-02-25T00:00:00 | [
[
"Dvornikov",
"Maxim",
"",
"1 and 2"
],
[
"Rashba",
"Timur",
"",
"1 and 3"
],
[
"Semikoz",
"Victor",
"",
"IZMIRAN"
]
] |
0705.2924 | Pran Nath | Daniel Feldman, Zuowei Liu and Pran Nath | The Stueckelberg Extension and Milli Weak and Milli Charge Dark Matter | 10 pages, 2 figures. Plenary Talk at the International Workshop on
Theoretical Physics (IWTHEP) Roorkee, March 15-20, 2007 | AIPConf.Proc.939:50-58,2007 | 10.1063/1.2803786 | null | hep-ph | null | A overview is given of the recent developments in the $U(1)_X$ Stueckelberg
extensions of the Standard Model and of MSSM where all the Standard Model
particles are neutral under the $U(1)_X$ but an axion which is absorbed is
charged under both $U(1)_X$ and $U(1)_Y$ and acts as the connector field
coupling the Standard Model sector with the Stueckelberg sector. Coupled with
the usual Higgs mechanism that breaks the $SU(2)_L\times U(1)_Y$ gauge
symmetry, this scenario produces mixings in the neutral gauge boson sector
generating an extra $Z'$ boson. The couplings of the extra $Z'$ to the Standard
Model particles are milli weak but its couplings to the hidden sector matter,
defined as matter that couples only to the gauge field of $U(1)_X$, can be of
normal electro-weak strength. It is shown that such extensions, aside from the
possibility of leading to a sharp $Z' $ resonance, lead to two new types of
dark matter: milli weak (or extra weak) and milli charged. An analysis of the
relic density shows that the WMAP-3 constraints can be satisfied for either of
these scenarios. The types of models discussed could arise as possible field
point limit of certain Type IIB orientifold string models.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 15:39:27 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 22:10:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Feldman",
"Daniel",
""
],
[
"Liu",
"Zuowei",
""
],
[
"Nath",
"Pran",
""
]
] |
0705.2925 | Schoeffel Laurent | Laurent Schoeffel | Deeply Virtual Compton Scattering at HERA II | 4 pages, 3 figures, prepared for the International Workshop on
Deep-Inelastic Scattering and Related Subjets April 16-20, 2007, Munich,
Germany | null | null | null | hep-ph | null | A new measurement is presented of elastic deeply virtual Compton scattering
(DVCS) based on data taken by the H1 detector during the complete HERA II
period. The data are well described by QCD based calculations. For the first
time, a beam charge asymmetry is obtained in a colliding mode, using data
recorded in $e^-p$ and $e^+p$. A significant non zero value is measured,
related to the interference of QCD and QED processes, namely the DVCS and
Bethe-Heitler reactions.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 07:22:41 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 08:46:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schoeffel",
"Laurent",
""
]
] |
0705.2926 | Eugen-Mihaita Cioroianu | C. Bizdadea, E. M. Cioroianu, A. C. Lungu | No interactions for a collection of Weyl gravitons intermediated by a
scalar field | 53 pages | Int.J.Mod.Phys.A21:4083-4126,2006 | 10.1142/S0217751X06031284 | null | hep-th | null | The cross-couplings among several Weyl gravitons (described in the free limit
by a sum of linearized Weyl actions) in the presence of a scalar field are
studied with the help of the deformation theory based on local BRST cohomology.
Under the hypotheses of locality, smoothness of the interactions in the
coupling constant, Poincare invariance, (background) Lorentz invariance, and
the preservation of the number of derivatives on each field, together with the
supplementary assumption that the internal metric defined by the sum of Weyl
lagrangians is positively defined, we prove that there are no consistent
cross-interactions among different Weyl gravitons in the presence of a scalar
field. The couplings of a single Weyl graviton to a scalar field are also
discussed.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 07:23:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bizdadea",
"C.",
""
],
[
"Cioroianu",
"E. M.",
""
],
[
"Lungu",
"A. C.",
""
]
] |
0705.2927 | Baohua Fu | Baohua Fu (LMJL) | Inductive characterizations of hyperquadrics | null | null | null | null | math.AG | null | We give two characterizations of hyperquadrics: one as non-degenerate smooth
projective varieties swept out by large dimensional quadric subvarieties
passing through a point; the other as $LQEL$-manifolds with large secant
defects.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 07:24:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Fu",
"Baohua",
"",
"LMJL"
]
] |
0705.2928 | Yigal Shamir | Maarten Golterman, Yigal Shamir | The Tunneling Hybrid Monte-Carlo algorithm | improved discussion in appendix B, RevTeX, 19 pages | Phys.Rev.D76:094512,2007 | 10.1103/PhysRevD.76.094512 | null | hep-lat | null | The hermitian Wilson kernel used in the construction of the domain-wall and
overlap Dirac operators has exceptionally small eigenvalues that make it
expensive to reach high-quality chiral symmetry for domain-wall fermions, or
high precision in the case of the overlap operator. An efficient way of
suppressing such eigenmodes consists of including a positive power of the
determinant of the Wilson kernel in the Boltzmann weight, but doing this also
suppresses tunneling between topological sectors. Here we propose a
modification of the Hybrid Monte-Carlo algorithm which aims to restore
tunneling between topological sectors by excluding the lowest eigenmodes of the
Wilson kernel from the molecular-dynamics evolution, and correcting for this at
the accept/reject step. We discuss the implications of this modification for
the acceptance rate.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 07:47:20 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 10:04:07 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Oct 2007 16:09:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Golterman",
"Maarten",
""
],
[
"Shamir",
"Yigal",
""
]
] |
0705.2929 | M. Houzet | M. Houzet and A. I. Buzdin | Long range triplet Josephson effect through a ferromagnetic trilayer | 4 pages, 2 figures | Phys. Rev. B 76, 060504(R) (2007) | 10.1103/PhysRevB.76.060504 | null | cond-mat.supr-con cond-mat.mes-hall | null | We study the Josephson current through a ferromagnetic trilayer, both in the
diffusive and clean limits. For colinear (parallel or antiparallel)
magnetizations in the layers, the Josephson current is small due to short range
proximity effect in superconductor/ferromagnet structures. For non colinear
magnetizations, we determine the conditions for the Josephson current to be
dominated by another contribution originating from long range triplet proximity
effect.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 07:44:41 GMT"
}
] | 2015-03-31T00:00:00 | [
[
"Houzet",
"M.",
""
],
[
"Buzdin",
"A. I.",
""
]
] |
0705.2930 | Can Aktas | Can Aktas and Ihsan Yilmaz | Magnetized Quark and Strange Quark Matter in the Spherical Symmetric
Space-Time Admitting Conformal Motion | This submission has been withdrawn by arXiv administrators due to
inappropriate text reuse from external sources | Gen.Rel.Grav.39:849-862,2007 | 10.1007/s10714-007-0426-2 | null | gr-qc | null | This paper has been removed by arXiv administrators because it plagiarizes
astro-ph/0611537, astro-ph/0506256, astro-ph/0203033, astro-ph/0311128,
gr-qc/0505144, astro-ph/0611460, and astro-ph/0610840.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 07:52:02 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 18:38:39 GMT"
}
] | 2019-10-21T00:00:00 | [
[
"Aktas",
"Can",
""
],
[
"Yilmaz",
"Ihsan",
""
]
] |
0705.2931 | Hidehiro Yonezawa | Hidehiro Yonezawa, Akira Furusawa, Peter van Loock | Sequential Quantum Teleportation of Optical Coherent States | 5page, 4figures | Phys. Rev. A 76, 032305 (2007) | 10.1103/PhysRevA.76.032305 | null | quant-ph | null | We demonstrate a sequence of two quantum teleportations of optical coherent
states, combining two high-fidelity teleporters for continuous variables. In
our experiment, the individual teleportation fidelities are evaluated as F_1 =
0.70 \pm 0.02 and F_2 = 0.75 \pm 0.02, while the fidelity between the input and
the sequentially teleported states is determined as F^{(2)} = 0.57 \pm 0.02.
This still exceeds the optimal fidelity of one half for classical teleportation
of arbitrary coherent states and almost attains the value of the first
(unsequential) quantum teleportation experiment with optical coherent states.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:19:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yonezawa",
"Hidehiro",
""
],
[
"Furusawa",
"Akira",
""
],
[
"van Loock",
"Peter",
""
]
] |
0705.2932 | Hiro-Fumi Yamada | Kazuya Aokage, Hiroshi Mizukawa and Hiro-Fumi Yamada | Compound basis for the space of symmetric functions | 8 pages. submited RIMS Kokyuroku-Bessatsu | null | null | null | math.RT math.CO | null | The aim of this note is to introduce a compound basis for the space of
symmetric functions. Our basis consists of products of Schur functions and
$Q$-functions. The basis elements are indexed by the partitions. It is well
known that the Schur functions form an orthonormal basis for our space. A
natural question arises. How are these two bases connected? In this note we
present some numerical results of the transition matrix for these bases. In
particular we will see that the determinant of the transition matrix is a power
of 2. This is not a surprising fact. However the explicit formula involves an
interesting combinatorial feature.
Our compound basis comes from the twisted homogeneous realization of the
basic representation of the affine Lie algebras.
This note is not written in a standard style of mathematical articles. It is
more like a draft of a talk. In particular proofs are not given here. Details
and proofs will be published elsewhere.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 08:15:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Aokage",
"Kazuya",
""
],
[
"Mizukawa",
"Hiroshi",
""
],
[
"Yamada",
"Hiro-Fumi",
""
]
] |
0705.2933 | Ezio Vasselli | Ezio Vasselli | Gauge-equivariant Hilbert bimodules and crossed products by
endomorphisms | 28 pages; corrected an error in Ex.6.3.2 of the previous version | International Journal of Mathematics 20(11) (2009) 1363-1396 | null | null | math.OA math-ph math.KT math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | C*-endomorphisms arising from superselection structures with non-trivial
centre define a 'rank' and a 'first Chern class'. Crossed products by such
endomorphisms involve the Cuntz-Pimsner algebra of a vector bundle having the
above-mentioned rank and first Chern class, and can be used to construct a
duality for abstract (nonsymmetric) tensor categories vs. group bundles acting
on (nonsymmetric) Hilbert bimodules. Existence and unicity of the dual object
(i.e., the 'gauge' group bundle) are not ensured: we give a description of this
phenomenon in terms of a certain moduli space associated with the given
endomorphism. The above-mentioned Hilbert bimodules are noncommutative
analogues of gauge-equivariant vector bundles in the sense of Nistor-Troitsky.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 08:20:23 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2007 12:03:41 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Jul 2007 12:33:49 GMT"
},
{
"version": "v4",
"created": "Mon, 13 Oct 2008 10:16:35 GMT"
},
{
"version": "v5",
"created": "Tue, 14 Oct 2008 10:23:21 GMT"
}
] | 2011-11-18T00:00:00 | [
[
"Vasselli",
"Ezio",
""
]
] |
0705.2934 | Clive Emary | Clive Emary | Dark states in the magnetotransport through triple quantum dots | 7 pages, 7 figures | Phys. Rev. B 76, 245319 (2007) | 10.1103/PhysRevB.76.245319 | null | cond-mat.mes-hall | null | We consider the transport through a system of three coupled quantum dots in a
perpendicular magnetic field. At zero field, destructive interference can trap
an electron in a dark state -- a coherent superposition of dot states that
completely blocks current flow. The magnetic field can disrupt this
interference giving rise to oscillations in the current and its higher-order
statistics as the field is increased. These oscillations have a period of
either the flux-quantum or half the flux-quantum, depending on the dot
geometry. We give results for the stationary current and for the shotnoise and
skewness at zero and finite frequency.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 08:25:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Emary",
"Clive",
""
]
] |
0705.2935 | Stefan Rinner | S. Rinner, E. Werner | On the Role of Entanglement in Schroedinger's Cat Paradox | 10 pages; LaTeX; contact information updated | null | 10.2478/s11534-008-0021-5 | null | quant-ph | null | In this paper we re-investigate the core of Schroedinger's 'cat paradox'. We
argue that one has to distinguish clearly between superpositions of macroscopic
cat states and superpositions of entangled states which comprise both the state
of the cat. It is shown, that in the first instance recurrence to decoherence
or other mechanisms is not necessary in this special case in order to explain
the absence of macroscopic superpositions. Additionally, we present modified
versions of two quantum optical experiments as experimenta crucis. Applied
rigorously, quantum mechanical formalism reduces the problem to a mere
pseudo-paradox.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 08:30:07 GMT"
},
{
"version": "v2",
"created": "Wed, 23 May 2007 08:01:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rinner",
"S.",
""
],
[
"Werner",
"E.",
""
]
] |
0705.2936 | Gavin Ramsay | Gavin Ramsay and Mark Cropper (MSSL/UCL) | XMM-Newton observations of the eclipsing polar V2301 Oph | Accepted MNRAS | Mon.Not.Roy.Astron.Soc.379:1209-1216,2007 | 10.1111/j.1365-2966.2007.12011.x | null | astro-ph | null | We present XMM-Newton observations of the eclipsing polar V2301 Oph which
cover nearly 2.5 binary orbital cycles and 2 eclipses. This polar is believed
to have the lowest magnetic field strength (7 MG) of any known polar. We find
evidence for structure in the X-ray eclipse profile which shows a `standstill'
feature lasting 26+/-4 sec. This allows us to place an upper limit on the mass
of the white dwarf of ~1.2 Msun. We find no evidence for QPOs in the frequency
range 0.02-10 Hz. This coupled with the absence of QPOs in RXTE data suggest
that, if present, any oscillations in the shock front have a minimal effect on
the resultant X-ray flux. We find no evidence for a distinct soft X-ray
component in its spectrum - it therefore joins another 7 systems which do not
show this component. We suggest that those systems which are asynchronous, have
low mass transfer rates, or have accretion occurring over a relatively large
fraction of the white dwarf are more likely to show this effect. We find that
the specific mass transfer rate has to be close to 0.1 g cm^-2 s^-1 to predict
masses which are consistent with that derived from our eclipse analysis. This
maybe due to the fact that the low magnetic field strength allows accretion to
take place along a wide range of azimuth.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 08:57:53 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Ramsay",
"Gavin",
"",
"MSSL/UCL"
],
[
"Cropper",
"Mark",
"",
"MSSL/UCL"
]
] |
0705.2937 | Rafael Pepino | Rafael T. Pepino, Alvaro Ferraz, and Evgueny Kochetov | Doped carrier formulation of the t-J model: the projection constraint
and the effective Kondo-Heisenberg lattice representation | corrected and enlarged version | Phys. Rev. B 77, 035130 (2008) | 10.1103/PhysRevB.77.035130 | null | cond-mat.str-el cond-mat.supr-con | null | We show that the recently proposed doped carrier Hamiltonian formulation of
the t-J model should be complemented with the constraint that projects out the
unphysical states. With this new important ingredient, the previously used and
seemingly different spin-fermion representations of the t-J model are shown to
be gauge related to each other. This new constraint can be treated in a
controlled way close to half-filling suggesting that the doped carrier
representation provides an appropriate theoretical framework to address the t-J
model in this region. This constraint also suggests that the t-J model can be
mapped onto a Kondo-Heisenberg lattice model. Such a mapping highlights
important physical similarities between the quasi two-dimensional heavy
fermions and the high-T$_c$ superconductors. Finally we discuss the physical
implications of our model representation relating in particular the small
versus large Fermi surface crossover to the closure of the lattice spin gap.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 19:36:40 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 17:54:45 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Pepino",
"Rafael T.",
""
],
[
"Ferraz",
"Alvaro",
""
],
[
"Kochetov",
"Evgueny",
""
]
] |
0705.2938 | Guilhem Coq | Guilhem Coq (1), Olivier Alata (2), Marc Arnaudon (1), Christian
Olivier (2) ((1) Laboratoire de Math\'ematiques et Applications Poitiers
France, (2) Laboratoire Signal Image et Communications Poitiers France) | Codage arithmetique pour la description d'une distribution | 7 pages, 6 figures, in French, TAIMA'07 conference presentation
http://taima.enst-bretagne.fr/ | null | null | null | stat.ME | null | Using predictive adaptive arithmetic coding and the Minimum Description
Length principle, we derive an efficient tool for model selection problems :
the RIC information criterion. We then present an extension of these coding
techniques to non-parametrical estimation of a distribution and illustrate it
on the gray scales histogram of an image.
Key-words : Information criteria, MDL, model selection, non-parametrical
estimation, histograms.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:27:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Coq",
"Guilhem",
""
],
[
"Alata",
"Olivier",
""
],
[
"Arnaudon",
"Marc",
""
],
[
"Olivier",
"Christian",
""
]
] |
0705.2939 | Angelos Fotopoulos | A. Fotopoulos and M. Tsulaia | Interacting Higher Spins and the High Energy Limit of the Bosonic String | Published Version; typos corrected, references added; (v3) Some typos
corrected and a minor clarification about eq. (3.29) | Phys.Rev.D76:025014,2007 | 10.1103/PhysRevD.76.025014 | DFTT-8/2007 | hep-th | null | In this note, we construct a BRST invariant cubic vertex for massless fields
of arbitrary mixed symmetry in flat space-time. The construction is based on
the vertex given in bosonic Open String Field Theory. The algebra of gauge
transformations is closed without any additional, higher than cubic, couplings
due to the presence of an infinite tower of massless fields. We briefly discuss
the generalization of this result to a curved space-time and other possible
implications.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:35:55 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 12:29:40 GMT"
},
{
"version": "v3",
"created": "Wed, 14 May 2008 14:46:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fotopoulos",
"A.",
""
],
[
"Tsulaia",
"M.",
""
]
] |
0705.2940 | Ramazan Sever | Cevdet Tezcan, Ramazan Sever, Ozlem Yesiltas | A new approach to the exact solutions of the effective mass Schrodinger
equation | 14 pages | Int.J.Theor.Phys.47:1713,2008 | 10.1007/s10773-007-9613-x | null | quant-ph | null | Effective mass Schrodinger equation is solved exactly for a given potential.
Nikiforov-Uvarov method is used to obtain energy eigenvalues and the
corresponding wave functions. A free parameter is used in the transformation of
the wave function. The effective mass Schrodinger equation is also solved for
the Morse potential transforming to the constant mass Schr\"{o}dinger equation
for a potential. One can also get solution of the effective mass Schrodinger
equation starting from the constant mass Schrodinger equation.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:34:01 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jul 2007 06:36:42 GMT"
}
] | 2019-12-06T00:00:00 | [
[
"Tezcan",
"Cevdet",
""
],
[
"Sever",
"Ramazan",
""
],
[
"Yesiltas",
"Ozlem",
""
]
] |
0705.2941 | Dimitris Stamatellos | D. Stamatellos, A.P. Whitworth, D. Ward-Thompson (Cardiff University,
Wales, UK) | The dust temperatures of the prestellar cores in the rho Oph main cloud
and in other star forming regions: consequences for the core mass function | MNRAS accepted | Mon.Not.Roy.Astron.Soc.379:1390-1400,2007 | 10.1111/j.1365-2966.2007.11999.x | null | astro-ph | null | We estimate the dust temperatures of the clumps in the rho Oph main cloud
taking into account the 3D geometry of the region, and external heating from
the interstellar radiation field and from HD147879,a nearby luminous B2V star,
which is believed to dominate the radiation field in the region. We find that
the regions where prestellar cores are observed (i.e. at optical visual
extinctions >7 mag) are colder than ~10-11K. These dust temperatures are
smaller than those which previous studies of the same region have assumed. We
use the new dust temperatures to estimate the masses of the prestellar cores in
the rho Oph main cloud from mm observations, and we find core masses that are
larger than previous estimates by a factor of ~2-3. This affects the core mass
function (CMF) of the region; we find that the mass at which the core mass
spectrum steepens from a slope alpha~1.5 to a slope alpha~2.5 has moved from
~0.5 Msun to ~1Msun. In contrast with the CMF in other star forming regions
(e.g. Orion), there is no indication for a turnover down to the completeness
limit (~0.2Msun), but the CMF may flatten at around ~0.4Msun. We generalize our
results to the prestellar cores in Taurus and in Orion. In Taurus the ambient
radiation field heating the prestellar cores is believed to be weaker than than
that in rho Oph. Hence, the dust temperatures of the cores in Taurus are
expected to be below ~ 10-11 K.In Orion the radiation field is believed to be
10^3 times stronger than the standard interstellar radiation field. Based on
this assumption we estimate that the dust temperatures of the prestellar cores
in Orion are around ~20-30K.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:44:20 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Stamatellos",
"D.",
"",
"Cardiff University,\n Wales, UK"
],
[
"Whitworth",
"A. P.",
"",
"Cardiff University,\n Wales, UK"
],
[
"Ward-Thompson",
"D.",
"",
"Cardiff University,\n Wales, UK"
]
] |
0705.2942 | Tomohiro Sasamoto | T. Sasamoto | Fluctuations of the one-dimensional asymmetric exclusion process using
random matrix techniques | 41 pages, 10 figures, minor corrections, references added | J. Stat. Mech. (2007) P07007 | 10.1088/1742-5468/2007/07/P07007 | null | cond-mat.stat-mech | null | The studies of fluctuations of the one-dimensional Kardar-Parisi-Zhang
universality class using the techniques from random matrix theory are reviewed
from the point of view of the asymmetric simple exclusion process. We explain
the basics of random matrix techniques, the connections to the polynuclear
growth models and a method using the Green's function.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 10:07:51 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Jul 2007 04:39:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sasamoto",
"T.",
""
]
] |
0705.2943 | Katrien Uytterhoeven | K. Uytterhoeven (1), E. Poretti (1), E. Rodriguez (2), P. De Cat (3),
P. Mathias (4), J. H. Telting (5), V. Costa (6) and A. Miglio (7)((1) INAF
-Osservatorio Astronomico di Brera, Italy, (2) Instituto de Astrofisica de
Andalucia (CSIC), Spain, (3) Royal Observatoty of Belgium, Belgium, (4)
Observatoire de la Cote d'Azur, France, (5) Nordic Optical Telescope, Spain,
(6) Institut d'Astrophysique et de Geophysique de l'Universite de Liege,
Belgium) | Multiperiodicity in the newly discovered mid-late Be star V2104 Cygni | 7 pages, 4 figures, A&A accepted | Astron.Astrophys.470:1051-1057,2007 | 10.1051/0004-6361:20077657 | null | astro-ph | null | We obtained the first long, homogenous time-series of V2104Cyg, consisting of
679 datapoints, with the uvbybeta photometers of Sierra Nevada and San Pedro
Martir Observatories with the aim to detect and subsequently interpret the
intrinsic frequencies of this previously unstudied variable star, which turned
out to be a Be star. We try to figure out its place among the variable B stars
on the upper Main Sequence. In order to obtain additional information on
physical parameters we collected a few spectra with the ELODIE and FIES
instruments. We searched for frequencies in the uvby passbands using 2
different frequency analysis methods and used the S/N>4 criterion to select the
significant periodicities. We obtained an estimate of the physical parameters
of the underlying B star of spectral type between B5 and B7, by correcting for
the presence of a circumstellar disk, using a formalism based on the strenght
of the Halpha line emission. We detected 3 independent frequencies with
amplitudes below 0.01mag, f1 = 4.7126 c/d, f2 = 2.2342 c/d and f3 = 4.671 c/d,
and discovered that V2104Cyg is a Be star. The fast rotation (vsini=290+/-10
km/s, and 27<i<45) hampered the investigation of the associated pulsational
parameters l. Nevertheless, the most plausible explanation for the observed
variability of this mid-late type Be star is a non-radial pulsation model. This
paper is based on observations obtained at the Observatorio Astronomico
Nacional San Pedro Martir (Mexico), Observatorio de Sierra Nevada (Spain),
Observatoire de Haute Provence (France), and on observations made with the
Nordic Optical Telescope, Observatorio Roque de los Muchachos, La Palma, Spain.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:52:37 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Uytterhoeven",
"K.",
""
],
[
"Poretti",
"E.",
""
],
[
"Rodriguez",
"E.",
""
],
[
"De Cat",
"P.",
""
],
[
"Mathias",
"P.",
""
],
[
"Telting",
"J. H.",
""
],
[
"Costa",
"V.",
""
],
[
"Miglio",
"A.",
""
]
] |
0705.2944 | Atsushi Harada | A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, Y. Haga, E. Yamamoto,
Y. Onuki, K. M. Itoh, E. E. Haller, and H. Harima | Evidence for ferromagnetic spin-pairing superconductivity in UGe$_2$: A
$^{73}$Ge-NQR study under pressure | 5 pages, 5 figures | Phys. Rev. B 75, 140502 (2007). | 10.1103/PhysRevB.75.140502 | null | cond-mat.supr-con cond-mat.str-el | null | We report that a novel type of superconducting order parameter has been
realized in the ferromagnetic states in UGe$_2$ via $^{73}$Ge
nuclear-quadrupole-resonance (NQR) experiments performed under pressure ($P$).
Measurements of the nuclear spin-lattice relaxation rate $(1/T_1)$ have
revealed an unconventional nature of superconductivity such that the up-spin
band is gapped with line nodes, but the down-spin band remains gapless at the
Fermi level. This result is consistent with that of a ferromagnetic
spin-pairing model in which Cooper pairs are formed among ferromagnetically
polarized electrons. The present experiment has shed new light on a possible
origin of ferromagnetic superconductivity, which is mediated by ferromagnetic
spin-density fluctuations relevant to the first-order transition inside the
ferromagnetic states.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:52:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Harada",
"A.",
""
],
[
"Kawasaki",
"S.",
""
],
[
"Mukuda",
"H.",
""
],
[
"Kitaoka",
"Y.",
""
],
[
"Haga",
"Y.",
""
],
[
"Yamamoto",
"E.",
""
],
[
"Onuki",
"Y.",
""
],
[
"Itoh",
"K. M.",
""
],
[
"Haller",
"E. E.",
""
],
[
"Harima",
"H.",
""
]
] |
0705.2945 | Izumi Ojima | Izumi Ojima | Micro-Macro Duality and Emergence of Macroscopic Levels | An invited talk at an International Symposium QBIC 2007 | null | 10.1142/9789812793171_0015 | RIMS-1594 | math-ph math.MP | null | The mutual relation between quantum Micro and classical Macro is clarified by
a unified formulation of instruments describing measurement processes and the
associated amplification processes, from which some perspective towards a
description of emergence processes of spacetime structure is suggested.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:57:46 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Ojima",
"Izumi",
""
]
] |
0705.2946 | Gerd P\"uhlhofer | H.E.S.S. Collaboration: F. Aharonian, et al | Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232
with H.E.S.S. and broadband characterisation | 18 Pages, 6 Figures, accepted for publication in A&A; v2 includes
minor changes | Astron.Astrophys.470:475-489,2007 | 10.1051/0004-6361:20077057 | null | astro-ph | null | The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System
(H.E.S.S.) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a
live time of 43 hours. VHE (E > 10^11 eV) gamma-rays were detected for the
first time from this object. VHE observations of blazars are used to
investigate the inner parts of the blazar jets, and also to study the
extragalactic background light (EBL) in the near-infrared band. Observations in
2005 were conducted in a multiwavelength campaign, together with the RXTE
satellite and optical observations. In 2004, simultaneous observations with
XMM-Newton were obtained. 1ES 1101-232 was detected with H.E.S.S. with an
excess of 649 photons, at a significance of 10 sigma. The measured VHE
gamma-ray flux amounts to dN/dE = (5.63 +- 0.89) x 10^-13 (E/TeV)^-(2.94 +-
0.20) cm^-2 s^-1 TeV^-1, above a spectral energy threshold of 225 GeV. No
significant variation of the VHE gamma-ray flux on any time scale was found.
1ES 1101-232 exhibits a very hard spectrum, and at a redshift of z=0.186, is
the blazar with the highest confirmed redshift detected in VHE gamma-rays so
far. The data allow the construction of truly simultaneous spectral energy
distributions of the source, from the optical to the VHE band. Using an EBL
model with \nu F_\nu = 14 nW m^-2 sr^-1 at 1.5 \mu m as presented in Aharonian
et al. (Nature, 2006, 440, 1018) suggests an intrinsic VHE power output peak of
the source at above 3 TeV.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 10:43:55 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 19:27:43 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Collaboration",
"H. E. S. S.",
""
],
[
":",
"",
""
],
[
"Aharonian",
"F.",
""
]
] |
0705.2947 | Susanne Aalto | S. Aalto, R. Monje, S. Martin | Luminous HC3N line emission in NGC4418 - buried AGN or nascent
starburst? | 7 pages, one eps figure, uses aa.cls, submitted to Astronomy and
Astrophysics | null | 10.1051/0004-6361:20077366 | null | astro-ph | null | IRAM 30m observations reveal that the deeply obscured IR-luminous galaxy
NGC4418 has a rich molecular chemistry - including unusually luminous HC3N line
emission. We furthermore detect: ortho-H2CO 2-1, 3-2; CN 1-0, 2-1; HCO+, 1-0.
3-2, HCN 3-2, HNC 1-0, 3-2 (and tentatively OCS 12-11). The HCN, HCO+, H2CO and
CN line emission can be fitted to densities of n=5 x 10E4 - 10E5 cm-3 and gas
temperatures Tk=80-150 K. Both HNC and HC3N are, however, significantly more
excited than the other species which requires higher gas densities - or
radiative excitation through e.g. mid-IR pumping. The HCN line intensity is
fainter than that of HCO+ and HNC for the 3-2 transition, in contrast to
previous findings for the 1-0 lines where the HCN emission is the most
luminous. We tentatively suggest that the observed molecular line emission is
consistent with a young starburst, where the emission can be understood as
emerging from dense, warm gas with an additional PDR component. We find that
X-ray chemistry is not required to explain the observed mm line emission,
including the HCN/HCO+ 1-0 and 3-2 line ratios. The luminous HC3N line emission
is an expected signature of dense, starforming gas. A deeply buried AGN can not
be excluded, but its impact on the surrounding molecular medium is then
suggested to be limited. However, detailed modelling of HC3N abundances in
X-ray dominated regions (XDRs) should be carried out. The possibility of
radiative excitation should also be further investigated
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 10:30:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aalto",
"S.",
""
],
[
"Monje",
"R.",
""
],
[
"Martin",
"S.",
""
]
] |
0705.2948 | Vicent Mateu | Oscar Cata and Vicent Mateu | Chiral Perturbation Theory with tensor sources | 23 pages, one figure; typos corrected, one paragraph added, new
section added, references added, published version | JHEP 0709:078,2007 | 10.1088/1126-6708/2007/09/078 | FTUV/07-05-21, IFIC/07-23 | hep-ph | null | We construct the most general chirally-invariant Lagrangian for mesons in the
presence of external sources coupled to the tensor current
\bar{\psi}\sigma_{\mu\nu}\psi. In order to have only even terms in the chiral
expansion, we consider the new source of O(p^2). With this choice, we build the
even-parity effective Lagrangian up to the p^6-order (NLO). While there are
only 4 new terms at the p^4-order, at p^6-order we find 78 terms for n_f=2 and
113 terms for n_f=3. We provide a detailed discussion on the different
mechanisms that ensure that our final set of operators is complete and
non-redundant. We also examine the odd-parity sector, to conclude that the
first operators appear at the p^8-order (NNLO).
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 10:32:31 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 13:58:11 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Cata",
"Oscar",
""
],
[
"Mateu",
"Vicent",
""
]
] |
0705.2949 | Yury Zinoviev | Yury M. Zinoviev | Vacuum Expectation Values of the Quantum Fields | 26 pages | Theor.Math.Phys.157:1399-1419,2008 | 10.1007/s11232-008-0116-6 | null | hep-th | null | The new axiomatic system for the quantum field theory is proposed. The new
axioms are the description of the distributions. For the finite series these
distributions satisfy the linear Wightman axioms.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 10:38:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zinoviev",
"Yury M.",
""
]
] |
0705.2950 | Mauricio D. Garay | Mauricio D. Garay | Analytic geometry and semi-classical analysis | null | null | null | null | math-ph math.MP | null | Expository paper on the relations between perturbation theory of
pseudo-differential operators, finiteness theorems and deformations of
Lagrangian varieties.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 10:47:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Garay",
"Mauricio D.",
""
]
] |
0705.2951 | Wang Zhi Yong | Zhi-Yong Wang, Cai-Dong Xiong | Another derivation of Weinberg's formula | 14 pages, to be published in Physics Letters B | Physics Letters B 659 (2008) 707-711 | 10.1016/j.physletb.2007.11.040 | null | quant-ph | null | To investigate how quantum effects might modify special relativity, we will
study a Lorentz transformation between classical and quantum reference frames
and express it in terms of the four-dimensional (4D) momentum of the quantum
reference frame. The transition from the classical expression of the Lorentz
transformation to a quantum-mechanical one requires us to symmetrize the
expression and replace all its dynamical variables with the corresponding
operators, from which we can obtain the same conclusion as that from quantum
field theory (given by Weinberg's formula): owing to the Heisenberg's
uncertainty relation, a particle (as a quantum reference frame) can propagate
over a spacelike interval.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 11:01:03 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 00:14:20 GMT"
},
{
"version": "v3",
"created": "Sun, 5 Aug 2007 09:02:37 GMT"
},
{
"version": "v4",
"created": "Fri, 24 Aug 2007 15:22:57 GMT"
},
{
"version": "v5",
"created": "Mon, 15 Oct 2007 10:45:41 GMT"
},
{
"version": "v6",
"created": "Tue, 4 Dec 2007 03:11:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Zhi-Yong",
""
],
[
"Xiong",
"Cai-Dong",
""
]
] |
0705.2952 | Manuel Pav\'on Valderrama | M. Pavon Valderrama and E. Ruiz Arriola | Renormalization Group Analysis of Boundary Conditions in Potential
Scattering | 31 pages, 8 figures | AnnalsPhys.323:1037-1086,2008 | 10.1016/j.aop.2007.08.003 | null | nucl-th | null | We analyze how a short distance boundary condition for the Schrodinger
equation must change as a function of the boundary radius by imposing the
physical requirement of phase shift independence on the boundary condition. The
resulting equation can be interpreted as a variable phase equation of a
complementary boundary value problem. We discuss the corresponding infrared
fixed points and the perturbative expansion around them generating a short
distance modified effective range theory. We also discuss ultraviolet fixed
points, limit cycles and attractors with a given fractality which take place
for singular attractive potentials at the origin. The scaling behaviour of
scattering observables can analytically be determined and is studied with some
emphasis on the low energy nucleon-nucleon interaction via singular pion
exchange potentials. The generalization to coupled channels is also studied.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 11:59:57 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 14:05:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Valderrama",
"M. Pavon",
""
],
[
"Arriola",
"E. Ruiz",
""
]
] |
0705.2953 | Bart Leurs | B.W.A. Leurs, Z. Nazario, D.I. Santiago and J. Zaanen | Non-Abelian hydrodynamics and the flow of spin in spin-orbit coupled
substances | 23 pages, 7 figures | null | 10.1016/j.aop.2007.06.012 | null | cond-mat.str-el | null | Motivated by heavy ion collision experiments, we study the hydrodynamic
properties of non-Abelian systems. These issues arise in condensed matter
physics in the context of transport of spins in the presence of spin orbit
coupling: the Pauli Hamiltonian governing the leading relativistic corrections
in condensed matter systems can be rewritten in a language of SU(2) covariant
derivatives, where the role of the non-Abelian gauge fields is taken by the
physical electromagnetic fields. Taking a similar perspective as Jackiw and
coworkers, we show that non-abelian hydrodynamical currents can be factored in
a non-coherent 'classical' part, and a coherent part requiring macroscopic
non-abelian quantum entanglement. Non-abelian flow being thus a much richer
affair than familiar hydrodynamics, permits us to classify the various spin
transport phenomena in in condensed matter physics in a unifying framework.In
semiconductor spintronics, the absence of hydrodynamics is well known, but in
our formulation it is directly associated with the fact that non-abelian
currents are only covariantly conserved.We analyze the quantum mechanical
single particle currents of relevance to mesoscopic transport with as highlight
the Aharonov-Casher effect, where we demonstrate that the non-abelian transport
structure renders it much more fragile than its abelian counterpart, the
Aharonov-Bohm effect. We subsequently focus on spin flows protected by order
parameters, of which the spin-spiral magnets and the spin superfluids are
important examples. The surprising bonus is that the presence of an order
parameter, being single-valued, restores hydrodynamics. We demonstrate a new
effect: the trapping of electrical line charge, being the 'fixed frame'
non-Abelian analogue of the familiar magnetic flux trapping by superconductors.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 11:23:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Leurs",
"B. W. A.",
""
],
[
"Nazario",
"Z.",
""
],
[
"Santiago",
"D. I.",
""
],
[
"Zaanen",
"J.",
""
]
] |
0705.2954 | Wolfgang Wagner | Wolfgang Wagner (for the CDF Collaboration) | Search for Single-Top Production at CDF | 4 pages, 3 figures, proceedings of the Rencontres de Moriond QCD and
High Energy Hadronic Interactions | null | null | null | hep-ex | null | This article reports on recent searches for single-top-quark production by
the CDF collaboration at the Tevatron using a data set that corresponds to an
integrated luminosity of 955 pb^-1. Three different analyses techniques are
employed, one using likelihood discriminants, one neural networks and one
matrix elements. The sensitivity to single-top production at the rate predicted
by the standard model ranges from 2.1 to 2.6 sigma. While the first two
analyses observe a deficit of single-top like events compared to the
expectation, the matrix element method observes an excess corresponding to a
background fluctuation of 2.3 sigma. The null results of the likelihood and
neural network analyses translate in upper limits on the cross section of 2.6\
pb for the t-channel production mode and 3.7 pb for the s-channel mode at the
95% C.L. The matrix element result corresponds to a measurement of
2.7^+1.5_-1.3 pb for the combined t- and s-channel single-top cross section. In
addition, CDF has searched for non-standard model production of
single-top-quarks via the s-channel exchange of a heavy W^\prime boson. No
signal of this process is found resulting in lower mass limits of 760 GeV/c^2
in case the mass of the right-handed neutrino is smaller than the mass of the
right-handed W^\prime or 790 GeV/c^2 in the opposite case.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 11:37:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Wagner",
"Wolfgang",
"",
"for the CDF Collaboration"
]
] |
0705.2955 | Maciej Ulas | Maciej Ulas | Rational points on certain elliptic surfaces | 16 pages. Submitted for publication | null | 10.4064/aa129-2-3 | null | math.NT | null | Let $\mathcal{E}_{f}:y^2=x^3+f(t)x$, where $f\in\Q[t]\setminus\Q$, and let us
assume that $\op{deg}f\leq 4$. In this paper we prove that if $\op{deg}f\leq
3$, then there exists a rational base change $t\mapsto\phi(t)$ such that on the
surface $\cal{E}_{f\circ\phi}$ there is a non-torsion section. A similar
theorem is valid in case when $\op{deg}f=4$ and there exists $t_{0}\in\Q$ such
that infinitely many rational points lie on the curve
$E_{t_{0}}:y^2=x^3+f(t_{0})x$. In particular, we prove that if $\op{deg}f=4$
and $f$ is not an even polynomial, then there is a rational point on
$\cal{E}_{f}$. Next, we consider a surface $\cal{E}^{g}:y^2=x^3+g(t)$, where
$g\in\Q[t]$ is a monic polynomial of degree six. We prove that if the
polynomial $g$ is not even, there is a rational base change $t\mapsto\psi(t)$
such that on the surface $\cal{E}^{g\circ\psi}$ there is a non-torsion section.
Furthermore, if there exists $t_{0}\in\Q$ such that on the curve
$E^{t_{0}}:y^2=x^3+g(t_{0})$ there are infinitely many rational points, then
the set of these $t_{0}$ is infinite. We also present some results concerning
diophantine equation of the form $x^2-y^3-g(z)=t$, where $t$ is a variable.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 12:10:43 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ulas",
"Maciej",
""
]
] |
0705.2956 | Peter Hochs | Peter Hochs | Quantisation commutes with reduction at discrete series representations
of semisimple groups | 60 pages, substantial error corrected | Advances in Mathematics 222 (2009) pp. 862-919 | null | null | math.SG math.KT | null | Using the analytic assembly map that appears in the Baum-Connes conjecture in
noncommutative geometry, we generalise the $\Spin^c$-version of the
Guillemin-Sternberg conjecture that `quantisation commutes with reduction' to
(discrete series representations of) semisimple groups $G$ with maximal compact
subgroups $K$ acting cocompactly on symplectic manifolds. We prove this
statement in cases where the image of the momentum map in question lies in the
set of strongly elliptic elements, the set of elements of $\g^*$ with compact
stabilisers. This assumption on the image of the momentum map is equivalent to
the assumption that $M = G \times_K N$, for a compact Hamiltonian $K$-manifold
$N$. The proof comes down to a reduction to the compact case. This reduction is
based on a `quantisation commutes with induction'-principle, and involves a
notion of induction of Hamiltonian group actions. This principle, in turn, is
based on a version of the naturality of the assembly map for the inclusion of
$K$ into $G$.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 12:11:36 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 19:02:45 GMT"
}
] | 2012-06-27T00:00:00 | [
[
"Hochs",
"Peter",
""
]
] |
0705.2957 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Masses of excited heavy baryons in the relativistic quark-diquark
picture | 13 pages; changed title; added Table VIII, note on new experimental
data and references; version to be published in Phys.Lett.B | Phys.Lett.B659:612-620,2008 | 10.1016/j.physletb.2007.11.037 | HU-EP-07/17 | hep-ph | null | The mass spectra of the excited heavy baryons consisting of two light (u,d,s)
and one heavy (c,b) quarks are calculated in the heavy-quark--light-diquark
approximation within the constituent quark model. The light quarks, forming the
diquark, and the light diquark in the baryon are treated completely
relativistically. The expansion in v/c up to the second order is used only for
the heavy (b and c) quarks. The internal structure of the diquark is taken into
account by inserting the diquark-gluon interaction form factor. An overall good
agreement of the obtained predictions with available experimental data is
found.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 12:46:51 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Nov 2007 15:03:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] |
0705.2958 | Merce Romero-Gomez | M. Romero-Gomez, E. Athanassoula, J.J. Masdemont, C. Garcia-Gomez | The formation of spiral arms and rings in barred galaxies | 16 pages, 13 figures, accepted in A&A. High resolution version
available at http://www.oamp.fr/dynamique/pap/merce.html | null | 10.1051/0004-6361:20077504 | null | astro-ph | null | In this and in a previous paper (Romero-Gomez et al. 2006) we propose a
theory to explain the formation of both spirals and rings in barred galaxies
using a common dynamical framework. It is based on the orbital motion driven by
the unstable equilibrium points of the rotating bar potential. Thus, spirals,
rings and pseudo-rings are related to the invariant manifolds associated to the
periodic orbits around these equilibrium points. We examine the parameter space
of three barred galaxy models and discuss the formation of the different
morphological structures according to the properties of the bar model. We also
study the influence of the shape of the rotation curve in the outer parts, by
making families of models with rising, flat, or falling rotation curves in the
outer parts. The differences between spiral and ringed structures arise from
differences in the dynamical parameters of the host galaxies. The results
presented here will be discussed and compared with observations in a
forthcoming paper.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 12:25:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Romero-Gomez",
"M.",
""
],
[
"Athanassoula",
"E.",
""
],
[
"Masdemont",
"J. J.",
""
],
[
"Garcia-Gomez",
"C.",
""
]
] |
0705.2959 | Oleg Verkhodanov | O. V. Verkhodanov (1), S. A. Trushkin (1), H. Andernach (2), V. N.
Chernenkov (1) ((1) Special Astrophysical Observatory, Nizhnij Arkhyz,
Karachaj-Cherkesia, Russia; (2) Departamento de Astronomia, Universidad de
Guanajuato, Mexico) | Current status of the CATS database | 12 pages, 1 figure | Bull.Spec.Astrophys.Obs.N.Caucasus 58:118-129,2005 | null | null | astro-ph | null | We describe the current status of CATS, a publicly accessible database
(web-server http://cats.sao.ru) allowing one to search in hundreds of catalogs
of astronomical objects discovered all along the electromagnetic spectrum. Our
emphasis is mainly laid on catalogs of radio continuum sources observed from 30
to 15000 MHz, secondly on catalogs of objects such as radio and active stars,
planetary nebulae, HII regions, supernova remnants (SNR), pulsars, nearby
galaxies, AGN and quasars. CATS also includes the catalogs from the largest
extragalactic surveys, like NVSS, FIRST, WENSS, VLSS, TXS, GB6, SUMSS, IRAS,
2MASS, SDSS, ROSAT, PGC, MCG, etc. In 2004 CATS comprised a total of $\sim10^9$
records from over 400 catalogs in the radio, IR, optical and X-ray windows,
including most of RATAN--600 catalogs. CATS is being expanded and updated, both
with newly published catalogs as well as older ones which we have created in
electronic form for the first time. We describe the principles of organization
of the database of astrophysical catalogs and the main functions of CATS.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 12:33:06 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Verkhodanov",
"O. V.",
""
],
[
"Trushkin",
"S. A.",
""
],
[
"Andernach",
"H.",
""
],
[
"Chernenkov",
"V. N.",
""
]
] |
0705.2960 | Fernando C. Lombardo | C. D. Fosco, F. C. Lombardo, and F. D. Mazzitelli | Quantum dissipative effects in moving mirrors: a functional approach | References added. Version to appear in Phys. Rev. D | Phys.Rev.D76:085007,2007 | 10.1103/PhysRevD.76.085007 | null | hep-th hep-ph quant-ph | null | We use a functional approach to study various aspects of the quantum
effective dynamics of moving, planar, dispersive mirrors, coupled to scalar or
Dirac fields, in different numbers of dimensions. We first compute the
Euclidean effective action, and use it to derive the imaginary part of the
`in-out' effective action. We also obtain, for the case of the real scalar
field in 1+1 dimensions, the Schwinger-Keldysh effective action and a
semiclassical Langevin equation that describes the motion of the mirror
including noise and dissipative effects due to its coupling to the quantum
fields.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 19:06:48 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 21:01:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fosco",
"C. D.",
""
],
[
"Lombardo",
"F. C.",
""
],
[
"Mazzitelli",
"F. D.",
""
]
] |
0705.2961 | Kacper Zalewski | K. Zalewski | Relations between classical phase-space distributions and Wigner
function for multiparticle production processes | 13 pages, LaTeX, no figures | Acta Phys.Polon.B39:181-192,2008 | null | null | hep-ph | null | The effects of interpreting classical phase space distributions as Wigner
functions, which is common in models of multiparticle production, are
discussed. The temperature for the classical description is always higher than
that for its Wigner function interpretation. A rough estimate shows that the
corresponding correction is proportional to R^(-2), where R is the radius of
the interaction region, and that it is negligible for heavy ion scattering, but
at the few percent level for e^+e^- annihilations.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 12:41:08 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Zalewski",
"K.",
""
]
] |
0705.2962 | Vanessa McBride | V.A. McBride, J. Wilms, I. Kreykenbohm, M.J. Coe, R.E. Rothschild, P.
Kretschmar, K. Pottschmidt, J. Fisher, T. Hamson | On the cyclotron line in Cep X-4 | Accepted for publication in A&A | null | 10.1051/0004-6361:20077238 | null | astro-ph | null | Accreting X-ray pulsars provide us with laboratories for the study of extreme
gravitational and magnetic fields, hence accurate descriptions of their
observational properties contribute to our understanding of this group of
objects. We aim to detect a cyclotron resonance scattering feature in the
Be/X-ray binary Cep X-4 and to investigate pulse profile and spectral changes
through the outburst. Spectral fitting and timing analysis are employed to
probe the properties of Cep X-4 during an outburst in 2002 June. A previously
announced cyclotron feature at 30.7 keV is confirmed, while the source shows
spectral behaviour and luminosity related changes similar to those observed in
previous outbursts. The long-term X-ray lightcurve shows a periodicity at 20.85
d, which could be attributed to the orbit in this Be system.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:13:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"McBride",
"V. A.",
""
],
[
"Wilms",
"J.",
""
],
[
"Kreykenbohm",
"I.",
""
],
[
"Coe",
"M. J.",
""
],
[
"Rothschild",
"R. E.",
""
],
[
"Kretschmar",
"P.",
""
],
[
"Pottschmidt",
"K.",
""
],
[
"Fisher",
"J.",
""
],
[
"Hamson",
"T.",
""
]
] |
0705.2963 | Raimundas Vidunas | Raimundas Vidunas, Alexander Kitaev | Computation of RS-pullback transformations for algebraic Painleve VI
solutions | 18 pages; 7 figures; Schlesinger transformations (and some examples)
are brought to the new paper http://arxiv.org/abs/0705.2963 | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Algebraic solutions of the sixth Painleve equation can be computed using
pullback transformations of hypergeometric equations with respect to specially
ramified rational coverings. In particular, as was noticed by the second author
and Doran, some algebraic solutions can be constructed from a rational covering
alone, without computation of the pullbacked Fuchsian equation. But the same
covering can be used to pullback different hypergeometric equations, resulting
in different algebraic Painleve VI solutions. This paper presents computations
of explicit RS-pullback transformations, and derivation of algebraic Painleve
VI solutions from them.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 19:42:35 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 12:15:51 GMT"
},
{
"version": "v3",
"created": "Wed, 15 Oct 2008 18:28:36 GMT"
}
] | 2008-10-15T00:00:00 | [
[
"Vidunas",
"Raimundas",
""
],
[
"Kitaev",
"Alexander",
""
]
] |
0705.2964 | Jonas Bylander | J. Bylander, T. Duty, G. Johansson and P. Delsing | Crossover from time-correlated single-electron tunneling to that of
Cooper pairs | 5 pages, 4 figures; v2: minor changes, clarifications, additions | Phys. Rev. B vol. 76, 020506(R) (2007) | 10.1103/PhysRevB.76.020506 | null | cond-mat.supr-con cond-mat.mes-hall | null | We have studied charge transport in a one-dimensional chain of small
Josephson junctions using a single-electron transistor. We observe a crossover
from time-correlated tunneling of single electrons to that of Cooper pairs as a
function of both magnetic field and current. At relatively high magnetic field,
single-electron transport dominates and the tunneling frequency is given by
f=I/e, where I is the current through the chain and e is the electron's charge.
As the magnetic field is lowered, the frequency gradually shifts to f=I/2e for
I>200 fA, indicating Cooper-pair transport. For the parameters of the measured
sample, we expect the Cooper-pair transport to be incoherent.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:02:11 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Nov 2007 10:35:07 GMT"
}
] | 2007-11-07T00:00:00 | [
[
"Bylander",
"J.",
""
],
[
"Duty",
"T.",
""
],
[
"Johansson",
"G.",
""
],
[
"Delsing",
"P.",
""
]
] |
0705.2965 | Jaroslaw Korbicz | J. K. Korbicz, J. Wehr, and M. Lewenstein | Entanglement of positive definite functions on compact groups | published version | Comm. Math. Phys. 281, 753 (2008) | 10.1007/s00220-008-0493-6 | null | quant-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define and study entanglement of continuous positive definite functions on
products of compact groups. We formulate and prove an infinite-dimensional
analog of Horodecki Theorem, giving a necessary and sufficient criterion for
separability of such functions. The resulting characterisation is given in
terms of mappings of the space of continuous functions, preserving positive
definiteness. The relation between the developed group-theoretical formalism
and the conventional one, given in terms of density matrices, is established
through the non-commutative Fourier analysis.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:02:32 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 19:25:34 GMT"
},
{
"version": "v3",
"created": "Mon, 23 Jun 2008 10:16:06 GMT"
},
{
"version": "v4",
"created": "Tue, 24 Jun 2008 10:25:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Korbicz",
"J. K.",
""
],
[
"Wehr",
"J.",
""
],
[
"Lewenstein",
"M.",
""
]
] |
0705.2966 | Thorsten Chwalek | Thorsten Chwalek | Measurement of the W-boson helicity fractions in top-quark decays at CDF | For the Proceedings of the 42nd Rencontres de Moriond 2007,
Electroweak Interactions and Unified Theories | null | null | null | hep-ex | null | We present a measurement of the fractions F_0 and F_+ of longitudinally
polarized and right-handed W bosons in top-quark decays using data collected
with the CDF II detector. The data set used in the analysis corresponds to an
integrated luminosity of approximately 955 pb-1. We select top-antitop
candidate events with one lepton, at least four jets, and missing transverse
energy. Our helicity measurement uses the decay angle theta*, which is defined
as the angle between the momentum of the charged lepton in the W boson
rest-frame and the W momentum in the top-quark rest-frame. The cos(theta*)
distribution in the data is determined by full kinematic reconstruction of the
top-antotop candidates. We find F_0 = 0.59 +- 0.12 (stat) +0.07 -0.06 (syst)
and F_+ = -0.03 +- 0.06 (stat) +0.04 -0.03 (syst), which is consistent with the
standard model prediction. We set an upper limit on the fraction of
right-handed W-bosons of F_+ < 0.1 at the 95% confidence level.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:05:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chwalek",
"Thorsten",
""
]
] |
0705.2967 | A. B. Kuklov | M. Boninsegni, A.B. Kuklov, L. Pollet, N.V. Prokof'ev, B.V. Svistunov,
M. Troyer | Luttinger Liquid in the Core of Screw Dislocation in Helium-4 | replaced with revised version | Phys.Rev.Lett. 99, 035301 (2007) | 10.1103/PhysRevLett.99.035301 | null | cond-mat.other | null | On the basis of first-principle Monte Carlo simulations we find that the
screw dislocation along the hexagonal axis of an hcp He4 crystal features a
superfluid core. This is the first example of a regular quasi-one-dimensional
supersolid, and one of the cleanest cases of a regular Luttinger-liquid system.
In contrast, the same type of screw dislocation in solid Hydrogen is
insulating.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:07:29 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jul 2007 17:03:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boninsegni",
"M.",
""
],
[
"Kuklov",
"A. B.",
""
],
[
"Pollet",
"L.",
""
],
[
"Prokof'ev",
"N. V.",
""
],
[
"Svistunov",
"B. V.",
""
],
[
"Troyer",
"M.",
""
]
] |
0705.2968 | A Botvina | A.S. Botvina (1), J. Pochodzalla (2) ((1) INR, Moscow, Russia, (2) IK,
J.Gutenberg University, Mainz, Germany) | Production of hypernuclei in multifragmentation of nuclear spectator
matter | 4 pages including 4 figures | Phys.Rev.C76:024909,2007 | 10.1103/PhysRevC.76.024909 | null | nucl-th | null | In peripheral collisions of relativistic heavy ions highly excited spectators
containing Lambda-hyperons can be produced. Such strange spectator matter may
undergo a break-up into many fragments (multifragmentation) as it is well
established for ordinary nuclear systems. We generalize the statistical
multifragmentation model, previously successfully used for the description of
experimental data, for the case of hypernuclear systems. We predict relative
yields of hypernuclei and the main characteristics of such a break-up. We point
at a connection of this phenomenon with a liquid-gas phase transition in
hypermatter.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 18:51:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Botvina",
"A. S.",
""
],
[
"Pochodzalla",
"J.",
""
]
] |
0705.2969 | Vincent Geers | V.C. Geers (1), K.M. Pontoppidan (2), E.F. van Dishoeck (1), C.P.
Dullemond (3), J.-C. Augereau (4), B. Mer\'in (1,5), I. Oliveira (1), J. W.
Pel (6), ((1) Leiden Observatory, (2) Caltech, (3) MPIA Heidelberg, (4)
Grenoble Observatory, (5) ESTEC, (6) Kapteyn Astronomical Institute) | Spatial separation of small and large grains in the transitional disk
around the young star IRS 48 | 4 pages, 4 figures, to be published in A&A | null | 10.1051/0004-6361:20077524 | null | astro-ph | null | We present spatially resolved mid-infrared images of the disk surrounding the
young star IRS 48 in the Ophiuchus cloud complex. The disk exhibits a ring-like
structure at 18.7 micron, and is dominated by very strong emission from
polycyclic aromatic hydrocarbons at shorter wavelengths. This allows a detailed
study of the relative distributions of small and large dust grains.
Images of IRS 48 in 5 mid-infrared bands from 8.6 to 18.7 micron as well as a
low resolution N-band spectrum are obtained with VLT-VISIR. Optical
spectroscopy is used to determine the spectral type of the central star and to
measure the strength of the Halpha line.
The 18.7 micron ring peaks at a diameter of 110 AU, with a gap of ~ 60 AU.
The shape of the ring is consistent with an inclination of i = 48 +- 8 degrees.
In contrast, the 7.5-13 micron PAH emission bands are centered on the source
and appear to fill the gap within the ring. The measured PAH line strengths are
10-100x stronger than those typically measured for young M0 stars and can only
be explained with a high PAH abundance and/or strong excess optical/UV
emission. The morphology of the images, combined with the absence of a silicate
emission feature, imply that the inner disk has been cleared of micron-sized
dust but with a significant population of PAHs remaining. We argue that the gap
can be due to grain growth and settling or to clearing by an unseen planetary
or low-mass companion. IRS 48 may represent a short-lived transitional phase
from a classical to a weak-line T Tauri star.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:12:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Geers",
"V. C.",
""
],
[
"Pontoppidan",
"K. M.",
""
],
[
"van Dishoeck",
"E. F.",
""
],
[
"Dullemond",
"C. P.",
""
],
[
"Augereau",
"J. -C.",
""
],
[
"Merín",
"B.",
""
],
[
"Oliveira",
"I.",
""
],
[
"Pel",
"J. W.",
""
]
] |
0705.2970 | Ashraf Latif Tadross | A. L. Tadross | A Reinvestigation of the Physical Properties of Pismis 3 based on 2MASS
Photometry | 10 pages, 6 figures | Chin.Astron.Astrophys.8:362,2008 | 10.1088/1009-9271/8/3/13 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a continuation of a series of work, we aim to refine and re-determine the
physical parameters of previously rarely or un-studied open star clusters with
good quality CMDs using Near-IR JHK photometry. Here we present a morphological
analysis of the 2MASS database (the digital Two Micron All Sky Survey) for the
open cluster Pismis 3. Some of the physical parameters are estimated for the
first time, and some others, re-determined.
| [
{
"version": "v1",
"created": "Sun, 20 May 2007 07:41:56 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 09:19:48 GMT"
},
{
"version": "v3",
"created": "Thu, 1 Nov 2007 10:49:02 GMT"
},
{
"version": "v4",
"created": "Wed, 18 Jun 2008 09:37:11 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Tadross",
"A. L.",
""
]
] |
0705.2971 | Oleg Verkhodanov | A. I. Kopylov (1), W. M. Goss (2), Yu. N. Pariiskii (1), N. S.
Soboleva (3), O. V. Verkhodanov (1), A. V. Temirova (2), O. P. Zhelenkova (1)
((1) Special Astrophysical Observatory RAS, Karachaevo-Cherkesia, Russia; (2)
National Radio Astronomy Observatory, Charlottesville, USA; (3) St.
Petersburg Branch of the Special Astrophysical Observatory, St. Petersburg,
Russia) | RC J0311+0507: A Candidate for Superpowerful Radio Galaxies in the Early
Universe at Redshift z=4.514 | 8 pages, 3 figures | Astron.Lett.32:433-438,2006 | 10.1134/S1063773706070012 | null | astro-ph | null | A strong emission line at 6703A has been detected in the optical spectrum for
the host galaxy (R=23.1) of the radio source RC J0311+0507 (4C+04.11). This
radio galaxy, with a spectral index of 1.31 in the frequency range 365-4850
MHz, is one of the ultrasteep spectrum objects from the deep survey of a sky
strip conducted with RATAN-600 in 1980-1981. We present arguments in favor of
the identification of this line with Ly\alpha at redshift z=4.514. In this
case, the object belongs to the group of extremely distant radio galaxies of
ultrahigh radio luminosity (P_{1400}=1.3 x 10^{29}W Hz^{-1}). Such power can be
provided only by a fairly massive black hole (~10^9M_\sun}) that formed in a
time less than the age of the Universe at the observed z(1.3 Gyr) or had a
primordial origin.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:14:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kopylov",
"A. I.",
""
],
[
"Goss",
"W. M.",
""
],
[
"Pariiskii",
"Yu. N.",
""
],
[
"Soboleva",
"N. S.",
""
],
[
"Verkhodanov",
"O. V.",
""
],
[
"Temirova",
"A. V.",
""
],
[
"Zhelenkova",
"O. P.",
""
]
] |
0705.2972 | Hinrich Meyer | Hinrich Meyer | Summary Talk: Challenges in Particle Astrophysics | 6 pages, Summary talk given at 'Rencontre de Vietnam, Hanoi, 2006 | null | null | null | astro-ph | null | A summary of the session on Particle Astrophysics at the Rencontre de
Vietnam, 2006.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:14:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Meyer",
"Hinrich",
""
]
] |
0705.2973 | Jun Chen | Jun Chen and Qiang Lin | Partially coherent matter wave and its evolution | 15 pages, 4 figures | null | 10.1016/j.optcom.2007.10.082 | null | physics.atom-ph | null | The evolution and propagation of a partially coherent matter wave (PCMW) is
investigated theoretically by the correlation function method. The ABCD matrix
formalism previously used for a fully coherent matter wave is extended to the
PCMW domain. A new ABCD law is derived, using a tensor method to describe the
evolution of a PCMW. An analytical solution of the first-order correlation
function is obtained that makes the propagation and evolution of a PCMW very
simple and clear. As an example, the propagation of a PCMW in a gravitational
field is calculated numerically.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:17:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"Jun",
""
],
[
"Lin",
"Qiang",
""
]
] |
0705.2974 | Marco Ruggieri | Marco Ruggieri | A diagrammatic derivation of the meson effective masses in the neutral
color-flavor-locked phase of Quantum Chromodynamics | 10 pages, 2 figures, RevTeX4 style. Version accepted for publication
on JHEP. Some minor change in the text | JHEP 0707:031,2007 | 10.1088/1126-6708/2007/07/031 | null | hep-ph | null | We offer a diagrammatic derivation of the effective masses of the axial
flavor excitations in the electrical and color neutral CFL phase of QCD. In
particular we concentrate on the excitations with the quantum numbers of the
kaons: we show how their effective chemical potentials, responsible of their
Bose-Einstein condensation and found previously on the basis of pure symmetry
arguments, arise at the microscopic level by loop effects. We perform also the
numerical evaluation of the relevant loops in the whole CFL regime
$M_s^2/2\mu\Delta\leqslant 1$, showing the existence of the enhancement of the
kaon condensation with respect to the lowest order result. Finally we discuss
the role of electrical and color neutrality in the microscopic calculation.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 15:46:34 GMT"
},
{
"version": "v2",
"created": "Sun, 8 Jul 2007 13:39:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ruggieri",
"Marco",
""
]
] |
0705.2975 | Michael Singer | Zo\'e Chatzidakis, Charlotte Hardouin, Michael F. Singer | On the Definitions of Difference Galois Groups | null | null | null | null | math.CA math.LO | null | We compare several definitions of the Galois group of a linear difference
equation that have arisen in algebra, analysis and model theory and show, that
these groups are isomorphic over suitable fields. In addition, we study
properties of Picard-Vessiot extensions over fields with not necessarily
algebraically closed subfields of constants.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:36:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chatzidakis",
"Zoé",
""
],
[
"Hardouin",
"Charlotte",
""
],
[
"Singer",
"Michael F.",
""
]
] |
0705.2976 | Alexander Gnedin | Alexander V. Gnedin | Optimal Stopping with Rank-Dependent Loss | null | null | null | null | math.PR | null | For $\tau$ a stopping rule adapted to a sequence of $n$ iid observations, we
define the loss to be $\ex [ q(R_\tau)]$, where $R_j$ is the rank of the $j$th
observation, and $q$ is a nondecreasing function of the rank. This setting
covers both the best choice problem with $q(r)={\bf 1}(r>1)$, and Robbins'
problem with $q(r)=r$. As $n\to\infty$ the stopping problem acquires a limiting
form which is associated with the planar Poisson process. Inspecting the limit
we establish bounds on the stopping value and reveal qualitative features of
the optimal rule. In particular, we show that the complete history dependence
persists in the limit, thus answering a question asked by Bruss in the context
of Robbins' problem.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:26:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gnedin",
"Alexander V.",
""
]
] |
0705.2977 | S. Komineas | S. Komineas | Rotating vortex dipoles in ferromagnets | 6 pages, 2 figures | Phys. Rev. Lett. 99, 117202 (2007) | 10.1103/PhysRevLett.99.117202 | null | cond-mat.other cond-mat.mtrl-sci | null | Vortex-antivortex pairs are localized excitations and have been found to be
spontaneously created in magnetic elements. In the case that the vortex and the
antivortex have opposite polarities the pair has a nonzero topological charge,
and it behaves as a rotating vortex dipole. We find theoretically, and confirm
numerically, the form of the energy as a function of the angular momentum of
the system and the associated rotation frequencies. We discuss the process of
annihilation of the pair which changes the topological charge of the system by
unity while its energy is monotonically decreasing. Such a change in the
topological charge affects profoundly the dynamics in the magnetic system. We
finally discuss the connection of our results with Bloch Points (BP) and the
implications for BP dynamics.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:32:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Komineas",
"S.",
""
]
] |
0705.2978 | Luca De Sanctis | Luca De Sanctis, Silvio Franz | Self-Averaging Identities for Random Spin Systems | 26 pages | null | null | null | math-ph math.MP | null | We provide a systematic treatment of self-averaging identities for various
spin systems. The method is quite general, basically not relying on the nature
of the model, and as a special case recovers the Ghirlanda-Guerra and
Aizenman-Contucci identities, which are therefore proven, together with their
extension, to be valid in a vaste class of spin models. We use the dilute spin
glass as a guiding example.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:46:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"De Sanctis",
"Luca",
""
],
[
"Franz",
"Silvio",
""
]
] |
0705.2979 | Dan Solomon | Dan Solomon | On the energy of physical states in QED in the convariant gauge | 8 pages | null | null | null | quant-ph | null | In quantum field theory it is generally assumed that there is a lower bound
to the energy of a quantum state. Here, it will be shown that there is no lower
bound to the energy of physical states in QED in a manifestly covariant gauge.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:47:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Solomon",
"Dan",
""
]
] |
0705.2980 | Sergio Montanez | Sergio Montanez | Geometric Transition as a Change of Polarization | 20 pages | JHEP0711:035,2007 | 10.1088/1126-6708/2007/11/035 | IFT-UAM/CSIC-07/26 | hep-th | null | Taking the results of hep-th/0702110 we study the Dijkgraaf-Vafa open/closed
topological string duality by considering the wavefunction behavior of the
partition function. We find that the geometric transition associated with the
duality can be seen as a change of polarization.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:04:41 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 14:01:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Montanez",
"Sergio",
""
]
] |
0705.2981 | Yong-Chang Huang | Yong-Chang Huang (1,3), Xi-Guo Lee (2), and Liu-Ji Li (1) ((1)
Institute of Theoretical Physics, Beijing University of Technology (formerly
Beijing Polytechnic Univ.), Beijing, P. R. China, (2) Institute of Modern
Physics, Chinese Academy of Science, Lanzhou, P. R. China, (3) CCAST (World
Lab.), Beijing, P. R. China) | General $SU(2)_L\times SU(2)_R \times U(1)_{EM}$ Sigma Model With
External Sources, Dynamical Breaking And Spontaneous Vacuum Symmetry Breaking | 12 pages | Int.J.Theor.Phys.46:221-236,2007 | 10.1007/s10773-006-9230-0 | null | hep-th | null | We give a general $SU(2)_L\times SU(2)_R$ $\times U(1)_{EM}$ sigma model with
external sources, dynamical breaking and spontaneous vacuum symmetry breaking,
and present the general formulation of the model. It is found that $\sigma $
and $\pi ^0$ without electric charges have electromagnetic interaction effects
coming from their internal structure. A general Lorentz transformation relative
to external sources $J_{gauge}$ $=(J_{A_\mu},J_{A_\mu ^\kappa})$ is derived,
using the general Lorentz transformation and the four-dimensional current of
nuclear matter of the ground state with $J_{gauge}$ = 0, we give the
four-dimensional general relations between the different currents of nuclear
matter systems with $J_{gauge}\neq 0$ and those with $J_{gauge}=0$. The
relation of the density's coupling with external magnetic field is derived,
which conforms well to dense nuclear matter in a strong magnetic field. We show
different condensed effects in strong interaction about fermions and
antifermions, and give the concrete scalar and pseudoscalar condensed
expressions of $\sigma_0$ and $\pi_0$ bosons. About different dynamical
breaking and spontaneous vacuum symmetry breaking, the concrete expressions of
different mass spectra are obtained in field theory. This paper acquires the
running spontaneous vacuum breaking value $\sigma_0^{\prime},$ and obtains the
spontaneous vacuum breaking in terms of the running $\sigma_0^{\prime}$, which
make nucleon, $\sigma $ and $\pi $ particles gain effective masses. We achieve
both the effect of external sources and nonvanishing value of the condensed
scalar and pseudoscalar paticles. It is deduced that the masses of nucleons,
$\sigma $ and $\pi $ generally depend on different external sources.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:52:31 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 12:57:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Huang",
"Yong-Chang",
""
],
[
"Lee",
"Xi-Guo",
""
],
[
"Li",
"Liu-Ji",
""
]
] |
0705.2982 | James Cline | James M. Cline | Fine-Tuning in Brane-antibrane Inflation | 14 pages, 11 figures; presented at conference "From Strings to LHC,"
January 2-10 2007, International Centre Dona Paula, Goa, India | PoSstringsLHC:023,2006 | null | null | hep-th astro-ph hep-ph | null | I give a brief overview of brane-antibrane inflation, with emphasis on the
problems of tuning to get a flat potential in the KKLMMT framework, and recent
work on the nature of superpotential corrections in that model.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 13:55:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cline",
"James M.",
""
]
] |
0705.2983 | Gunnar Klaemke | Gunnar Klamke, Dieter Zeppenfeld | Hjj production: Signals and CP measurements | 4 pages, 3 figures; Talk given by DZ at Rencontres de Moriond, QCD
session, La Thuile (Italy), March 2007 | null | null | null | hep-ph | null | Higgs boson production in association with two tagging jets will be mediated
by electroweak vector boson fusion and by gluon fusion. For the gluon fusion
process, analysis of the azimuthal angle correlations of the two jets provides
for a direct measurement of the CP-nature of the $Htt$ Yukawa coupling which is
responsible for the effective $Hgg$ vertex.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:17:09 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Klamke",
"Gunnar",
""
],
[
"Zeppenfeld",
"Dieter",
""
]
] |
0705.2984 | Wei He | Bin Chen, Wei He | Hawking Radiation of Black Rings from Anomalies | 15 pages,Latex; revised version, typos corrected, reference added; | Class.Quant.Grav.25:135011,2008 | 10.1088/0264-9381/25/13/135011 | null | gr-qc hep-th | null | We derive Hawking radiation of 5-dimensional black rings from gauge and
gravitational anomalies using the method proposed by Robinson and Wilczek. We
find as in the black hole case, the problem could reduce to a (1+1) dimensional
field theory and the anomalies result in correct Hawking temperature for
neutral,dipole and charged black rings.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:02:37 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 13:19:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Bin",
""
],
[
"He",
"Wei",
""
]
] |
0705.2985 | Alessandro Caccianiga | A. Caccianiga, P. Severgnini, R. Della Ceca, T. Maccacaro, F. J.
Carrera, M. J. Page | Elusive AGN in the XMM-Newton bright serendipitous survey | accepted for publication in A&A, 17 pages, 9 figures | null | 10.1051/0004-6361:20077732 | null | astro-ph | null | AIMS: We investigate here the nature of all the sources (35 in total) in the
XBS survey (which is 86% optically identified) showing an optical spectrum
dominated by the light from the host galaxy with no evidence (or little
evidence) for the presence of an AGN. METHODS: We use the X-ray spectral
analysis to assess the presence of an AGN in these sources and to characterize
its properties. RESULTS: We detect AGN activity in 33 out of 35 sources. The
remaining 2 sources are the ones with the lowest X-ray luminosity in the sample
(L[2-10keV]<10^41 erg s^-1) and their X-ray emission could be produced within
the host galaxy. We find that the ``recognition problem'' for AGN is very
critical in the low-luminosity regime (at least 60% of the AGN with
L[2-10keV]<10^43 erg s^-1 are elusive) becoming negligible for high X-ray
luminosities (~1.5% of elusive AGN with L[2-10keV]>10^44 erg s^-1). This
problem affects mostly absorbed AGN (~40% of type~2 AGN in the survey are
elusive) but also a significant fraction of unabsorbed AGN (8%). CONCLUSIONS:
We find that the simplest explanations of why these 33 (or most of them) AGNs
are elusive are two: at low X-ray luminosities (<10^43 erg s^-1) the most
important reason is the intrinsically low AGN/galaxy contrast (optical
dilution) while at high luminosities (>10^44 erg s^-1) it is due to the optical
absorption (in the Compton-thin regime, i.e. NH<10^24 cm^-2). Alternative
hypotheses, like the presence of Compton-thick sources, BL Lac objects or
``non-standard'' AGN (e.g. with alpha_OX<1 or with weak/absorbed Narrow Line
Region) are not supported by the data although we cannot exclude the presence
in the sample of a few sources of these types.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:13:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caccianiga",
"A.",
""
],
[
"Severgnini",
"P.",
""
],
[
"Della Ceca",
"R.",
""
],
[
"Maccacaro",
"T.",
""
],
[
"Carrera",
"F. J.",
""
],
[
"Page",
"M. J.",
""
]
] |
0705.2986 | Elvezio Morenzoni | E. Morenzoni, H. Luetkens, T. Prokscha, A. Suter, S. Vongtragool, F.
Galli, M.B.S. Hesselberth, N. Garifianov, R. Khasanov | Depth dependent spin dynamics of canonical spin glass films: A
low-energy muon spin rotation study | null | null | 10.1103/PhysRevLett.100.147205 | null | cond-mat.dis-nn | null | We have performed depth dependent muon spin rotation/relaxation studies of
the dynamics of single layer films of {\it Au}Fe and {\it Cu}Mn spin glasses as
a function of thickness and of its behavior as a function of distance from the
vacuum interface (5-70 nm). A significant reduction in the muon spin relaxation
rate as a function of temperature with respect to the bulk material is observed
when the muons are stopped near (5-10 nm) the surface of the sample. A similar
reduction is observed for the whole sample if the thickness is reduced to e.g.
20 nm and less. This reflects an increased impurity spin dynamics (incomplete
freezing) close to the surface although the freezing temperature is only
modestly affected by the dimensional reduction.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:22:51 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 10:42:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Morenzoni",
"E.",
""
],
[
"Luetkens",
"H.",
""
],
[
"Prokscha",
"T.",
""
],
[
"Suter",
"A.",
""
],
[
"Vongtragool",
"S.",
""
],
[
"Galli",
"F.",
""
],
[
"Hesselberth",
"M. B. S.",
""
],
[
"Garifianov",
"N.",
""
],
[
"Khasanov",
"R.",
""
]
] |
0705.2987 | Helge Mueller-Ebhardt | Henning Rehbein, Helge Mueller-Ebhardt, Kentaro Somiya, Chao Li, Roman
Schnabel, Karsten Danzmann, Yanbei Chen | Local readout enhancement for detuned signal-recycling interferometers | null | Phys.Rev.D76:062002,2007 | 10.1103/PhysRevD.76.062002 | null | gr-qc | null | Motivated by the optical-bar scheme of Braginsky, Gorodetsky and Khalili, we
propose to add to a high power detuned signal-recycling interferometer a local
readout scheme which measures the motion of the arm-cavity front mirror. At low
frequencies this mirror moves together with the arm-cavity end mirror, under
the influence of gravitational waves. This scheme improves the low-frequency
quantum-noise-limited sensitivity of optical-spring interferometers
significantly and can be considered as a incorporation of the optical-bar
scheme into currently planned second-generation interferometers. On the other
hand it can be regarded as an extension of the optical bar scheme. Taking
compact-binary inspiral signals as an example, we illustrate how this scheme
can be used to improve the sensitivity of the planned Advanced LIGO
interferometer, in various scenarios, using a realistic classical-noise budget.
We also discuss how this scheme can be implemented in Advanced LIGO with
relative ease.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:33:59 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 12:56:49 GMT"
},
{
"version": "v3",
"created": "Wed, 22 Aug 2007 15:32:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Rehbein",
"Henning",
""
],
[
"Mueller-Ebhardt",
"Helge",
""
],
[
"Somiya",
"Kentaro",
""
],
[
"Li",
"Chao",
""
],
[
"Schnabel",
"Roman",
""
],
[
"Danzmann",
"Karsten",
""
],
[
"Chen",
"Yanbei",
""
]
] |
0705.2988 | Antonio M. Puertas | Antonio M. Puertas, Cristiano De Michele, Francesco Sciortino, Piero
Tartaglia, Emanuela Zaccarelli | Viscoelasticity and Stokes-Einstein relation in repulsive and attractive
colloidal glasses | 12 pages; sent to J. Chem. Phys | null | 10.1063/1.2772628 | null | cond-mat.soft | null | We report a numerical investigation of the visco-elastic behavior in models
for steric repulsive and short-range attractive colloidal suspensions, along
different paths in the attraction-strength vs packing fraction plane. More
specifically, we study the behavior of the viscosity (and its frequency
dependence) on approaching the repulsive glass, the attractive glass and in the
re-entrant region where viscosity shows a non monotonic behavior on increasing
attraction strength. On approaching the glass lines, the increase of the
viscosity is consistent with a power-law divergence with the same exponent and
critical packing fraction previously obtained for the divergence of the density
fluctuations. Based on mode-coupling calculations, we associate the increase of
the viscosity with specific contributions from different length scales. We also
show that the results are independent on the microscopic dynamics by comparing
newtonian and brownian simulations for the same model. Finally we evaluate the
Stokes-Einstein relation approaching both glass transitions, finding a clear
breakdown which is particularly strong for the case of the attractive glass.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:23:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Puertas",
"Antonio M.",
""
],
[
"De Michele",
"Cristiano",
""
],
[
"Sciortino",
"Francesco",
""
],
[
"Tartaglia",
"Piero",
""
],
[
"Zaccarelli",
"Emanuela",
""
]
] |
0705.2989 | Davide Forcella | Davide Forcella | BPS Partition Functions for Quiver Gauge Theories: Counting Fermionic
Operators | 30 pages | null | null | null | hep-th | null | We discuss a general procedure to obtain 1/2 BPS partition functions for
generic N=1 quiver gauge theories. These functions count the gauge invariant
operators (bosonic and fermionic), charged under all the global symmetries
(mesonic and baryonic), in the chiral ring of a given quiver gauge theory. In
particular we discuss the inclusion of the spinor degrees of freedom in the
partition functions.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 15:00:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Forcella",
"Davide",
""
]
] |
0705.2990 | George Jackeli | G. Jackeli and D. A. Ivanov | Dimer phases in quantum antiferromagnets with orbital degeneracy | Final version, minor changes | Phys. Rev. B 76, 132407 (2007) | 10.1103/PhysRevB.76.132407 | null | cond-mat.str-el cond-mat.stat-mech | null | We study and solve the ground-state problem of a microscopic model for a
family of orbitally degenerate quantum magnets. The orbital degrees of freedom
are assumed to have directional character and are represented by static
Potts-like variables. In the limit of vanishing Hund's coupling, the
ground-state manifold of such a model is spanned by the hard-core dimer (spin
singlet) coverings of the lattice. The extensive degeneracy of dimer coverings
is lifted at a finite Hund's coupling through an order-out-of-disorder
mechanism by virtual triplet excitations. The relevance of our results to
several experimentally studied systems is discussed.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:33:05 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Oct 2007 09:46:41 GMT"
}
] | 2007-10-25T00:00:00 | [
[
"Jackeli",
"G.",
""
],
[
"Ivanov",
"D. A.",
""
]
] |
0705.2991 | Marco Genovese | Giorgio Brida, Maria Chekhova, Marco Genovese, Alexander Penin, Maria
Luisa Rastello and Ivano Ruo-Berchera | Absolute Calibration of Analog Detectors by using Parametric Down
Conversion | null | IEEE Trans. I.&M., 56 (2007) 275 | null | null | quant-ph | null | In this paper we report our systematic study of a promising absolute
calibration technique of analog photo-detectors, based on the properties of
parametric down conversion. Our formal results and a preliminary uncertainty
analysis show that the proposed method can be effectively developed with
interesting applications to metrology.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 09:13:26 GMT"
}
] | 2007-07-03T00:00:00 | [
[
"Brida",
"Giorgio",
""
],
[
"Chekhova",
"Maria",
""
],
[
"Genovese",
"Marco",
""
],
[
"Penin",
"Alexander",
""
],
[
"Rastello",
"Maria Luisa",
""
],
[
"Ruo-Berchera",
"Ivano",
""
]
] |
0705.2992 | Syksy Rasanen | Syksy Rasanen | Comment on ``Nontrivial Geometries: Bounds on the Curvature of the
Universe'' | 4 pages | Astropart.Phys.30:216-217,2008 | 10.1016/j.astropartphys.2008.09.001 | CERN-PH-TH/2007-086 | astro-ph gr-qc hep-ph hep-th | null | The paper 0705.0332v1 seeks to study the effect of non-trivial spatial
curvature in homogeneous and isotropic models. We note that the space
considered is not homogeneous, and that the equations of motion used are
inconsistent with the metric. Also, we explain why the spatial curvature of
homogeneous and isotropic spacetimes always evolves like 1/a^2, contrary to the
central assumption of 0705.0332v1.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:43:25 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Rasanen",
"Syksy",
""
]
] |
0705.2993 | Soack Dae Yoon | Soack Dae Yoon, Carmine Vittoria, Vincent G. Harris, Allan Widom | Room temperature spin polarized magnetic semiconductor | 4 pages in double column, 5 Postscript figures, uses LaTex | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | Alternating layers of granular Iron (Fe) and Titanium dioxide
(TiO$_{2-\delta}$) were deposited on (100) Lanthanum aluminate (LaAlO$_3$)
substrates in low oxygen chamber pressure using a controlled pulsed laser
ablation deposition technique. The total thickness of the film was about 200
nm. The films show ferromagnetic behavior for temperatures ranging from 4 to
$400 ^oK$. The layered film structure was characterized as p-type magnetic
semiconductor at $300 ^oK$ with a carrier density of the order of $10^{20}
/cm^3$. The undoped pure TiO$_{2-\delta}$ film was characterized as an n-type
magnetic semiconductor. The hole carriers were excited at the interface between
the granular Fe and TiO$_{2-\delta}$ layers similar to holes excited in the
metal/n-type semiconductor interface commonly observed in
Metal-Oxide-Semiconductor (MOS) devices. The holes at the interface were
polarized in an applied magnetic field raising the possibility that these
granular MOS structures can be utilized for practical spintronic device
applications.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:51:45 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Yoon",
"Soack Dae",
""
],
[
"Vittoria",
"Carmine",
""
],
[
"Harris",
"Vincent G.",
""
],
[
"Widom",
"Allan",
""
]
] |
0705.2994 | Z. Ya. Turakulov | Z. Ya. Turakulov | Non-relativistic limit of the Einstein equation | 8 pages | null | null | null | gr-qc | null | In particular cases of stationary and stationary axially symmetric space-time
passage to non-relativistic limit of Einstein equation is completed. For this
end the notions of absolute space and absolute time are introduced due to
stationarity of the space-time under consideration. In this construction
absolute time is defined as a function $t$ on the space-time such that $\prt_t$
is exactly the Killing vector and the space at different moments is presented
by the surfaces $t=\con $. The space-time metric is expressed in terms of
metric of the 3-space and two potentials one of which is exactly Newtonian
gravitational potential $\Phi$, another is vector potential $\vec A$ which,
however, differs from vector potential known in classical electrodynamics. In
the first-order approximation on $\Phi/c^2$, $|\vec A|/c$ Einstein equation is
reduced to a system for these functions in which left-hand sides contain
Laplacian of the Newtonian potential, derivatives of the vector potential and
curvature of the space and the right-hand sides do 3-dimensional stress tensor
and densities of mass and energy. Subj-class: Classical Physics
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 14:54:50 GMT"
},
{
"version": "v2",
"created": "Wed, 23 May 2007 06:24:44 GMT"
},
{
"version": "v3",
"created": "Sat, 26 May 2007 08:48:30 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Turakulov",
"Z. Ya.",
""
]
] |
0705.2995 | Anthony Csizmazia | Anthony Csizmazia | On the Riemann zeta-function, Part III | 23 pages | null | null | null | math.GM | null | An odd meromorphic function f(s) is constructed from the Riemann
zeta-function evaluated at one-half plus s. The partial fraction expansion,
p(s), of f(s) is obtained using the conjunction of the Riemann hypothesis and
hypotheses advanced by the author. That compound hypothesis and the expansion
p(s) are employed in Part IV to derive the two-sided Laplace transform
representation of f(s) on the open vertical strip of all s with real part
between zero and four.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 15:04:38 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Csizmazia",
"Anthony",
""
]
] |
0705.2996 | Davide Gabrielli | L. Bertini, A. De Sole, D. Gabrielli, G. Jona-Lasinio, C. Landim | On the long range correlations of thermodynamic systems out of
equilibrium | 4 pages | null | null | Roma01.Math | cond-mat.stat-mech | null | Experiments show that macroscopic systems in a stationary nonequilibrium
state exhibit long range correlations of the local thermodynamic variables. In
previous papers we proposed a Hamilton-Jacobi equation for the nonequilibrium
free energy as a basic principle of nonequilibrium thermodynamics. We show here
how an equation for the two point correlations can be derived from the
Hamilton-Jacobi equation for arbitrary transport coefficients for dynamics with
both external fields and boundary reservoirs. In contrast with fluctuating
hydrodynamics, this approach can be used to derive equations for correlations
of any order. Generically, the solutions of the equation for the correlation
functions are non-trivial and show that long range correlations are indeed a
common feature of nonequilibrium systems. Finally, we establish a criterion to
determine whether the local thermodynamic variables are positively or
negatively correlated in terms of properties of the transport coefficients.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 15:10:54 GMT"
}
] | 2015-12-18T00:00:00 | [
[
"Bertini",
"L.",
""
],
[
"De Sole",
"A.",
""
],
[
"Gabrielli",
"D.",
""
],
[
"Jona-Lasinio",
"G.",
""
],
[
"Landim",
"C.",
""
]
] |
0705.2997 | Reza Asgari | R. Asgari, B. Tanatar, B. Davoudi | Comparative study of screened inter-layer interactions in the Coulomb
drag effect in bilayer electron systems | Final Version. To appear in Phys. Rev. B | Phys. Rev. B 77, 115301 (2008) | 10.1103/PhysRevB.77.115301 | null | cond-mat.mes-hall cond-mat.str-el | null | Coulomb drag experiments in which the inter-layer resistivity is measured are
important as they provide information on the Coulomb interactions in bilayer
systems. When the layer densities are low correlation effects become
significant to account for the quantitative description of experimental
results. We investigate systematically various models of effective inter-layer
interactions in a bilayer system and compare our results with recent
experiments. In the low density regime, the correlation effects are included
via the intra- and inter-layer local-field corrections. We employ several
theoretical approaches to construct static local-field corrections. Our
comparative study demonstrates the importance of including the correlation
effects accurately in the calculation of drag resistivity. Recent experiments
performed at low layer densities are adequately described by effective
inter-layer interactions incorporating static correlations.
| [
{
"version": "v1",
"created": "Mon, 21 May 2007 15:16:06 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 08:08:38 GMT"
},
{
"version": "v3",
"created": "Mon, 14 Jan 2008 06:03:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Asgari",
"R.",
""
],
[
"Tanatar",
"B.",
""
],
[
"Davoudi",
"B.",
""
]
] |
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