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sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.3801 | Kejia Lee | G. J. Qiao, K. J. Lee, B. Zhang, H. G. Wang and R. X. Xu | An annular gap acceleration model for $\gamma$-ray emission of pulsars | 11 pages 2 figures, accepted by Chinese Journal of Astronomy and
Astrophysics | null | 10.1088/1009-9271/7/4/04 | null | astro-ph | null | If the binding energy of the pulsar's surface is not so high (the case of a
neutron star), both the negative and positive charges will flow out freely from
the surface of the star. The annular free flow model for $\gamma$-ray emission
of pulsars is suggested in this paper. It is emphasized that: (1). Two kinds of
acceleration regions (annular and core) need to be taken into account. The
annular acceleration region is defined by the magnetic field lines that cross
the null charge surface within the light cylinder. (2). If the potential drop
in the annular region of a pulsar is high enough (normally the cases of young
pulsars), charges in both the annular and the core regions could be accelerated
and produce primary gamma-rays. Secondary pairs are generated in both regions
and stream outwards to power the broadband radiations. (3). The potential drop
in the annular region grows more rapidly than that in the core region. The
annular acceleration process is a key point to produce wide emission beams as
observed. (4). The advantages of both the polar cap and outer gap models are
retained in this model. The geometric properties of the $\gamma$-ray emission
from the annular flow is analogous to that presented in a previous work by Qiao
et al., which match the observations well. (5). Since charges with different
signs leave the pulsar through the annular and the core regions, respectively,
the current closure problem can be partially solved.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 14:35:50 GMT"
}
] | 2020-06-03T00:00:00 | [
[
"Qiao",
"G. J.",
""
],
[
"Lee",
"K. J.",
""
],
[
"Zhang",
"B.",
""
],
[
"Wang",
"H. G.",
""
],
[
"Xu",
"R. X.",
""
]
] |
0704.3802 | C. Miguel Arizmendi | C.M. Arizmendi, H.G.E. Hentschel, F. Family | Entropic Studies of Cytoskeletal Motors Jamming | 6 pages, 2 figures | Physica A: Statistical Mechanics and its Applications, Volume 356,
Issue 1, 1 October 2005, Pages 6-11 | null | null | cond-mat.soft | null | Can the different causes for disruption of intracellular transport be traced
from the trajectories of the molecular motors on the cytoskeletal filaments? We
will attempt to answer this important question in a Monte Carlo model of
microtubule-motor protein interaction from the point of view of information
theory.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 15:02:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Arizmendi",
"C. M.",
""
],
[
"Hentschel",
"H. G. E.",
""
],
[
"Family",
"F.",
""
]
] |
0704.3803 | Kunth Daniel | Daniel Kunth (Institut Astrophysique de Paris, France; kunth at
iap.fr) and Goran Ostlin (Stockholm Observatory, Sweden; ostlin at
astro.su.se) | Are the most metal-poor galaxies young? | Galaxy Evolution across the Hubble Time Proceedings IAU Symposium No.
235, 2006 F.Combes and J. Palous, eds. c 2006 International Astronomical
Union | null | 10.1017/S1743921306005060 | null | astro-ph | null | We review the possibility that metallicity could provide a diagnostic for the
age of a galaxy, hence that the most metal-poor star forming galaxies in the
local universe may be genuinely young. Indeed, observational evidence for
downsizing shows the average age of the stars in a galaxy to decrease with
decreasing mass and metallicity. However, we conclude both from observational
and theoretical viewpoints that metallicity is not an arrow of time.
Consequently the most metal poor galaxies of our local universe are not
necessarely young. Current observations suggest that an old stellar population
is present in all metal-poor galaxies, although a couple of cases, e.g. IZw18,
remain under debate. Further observations with more sentitive equipement should
settle this question in the coming years.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 15:36:36 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kunth",
"Daniel",
"",
"Institut Astrophysique de Paris, France; kunth at\n iap.fr"
],
[
"Ostlin",
"Goran",
"",
"Stockholm Observatory, Sweden; ostlin at\n astro.su.se"
]
] |
0704.3804 | Armen M. Gulian | A. M. Gulian | Superconducting antenna for detection of gravitational waves | This paper has been withdrawn because much more advanced concept has
been developed by the author with colleagues in 2011 | null | null | null | cond-mat.supr-con gr-qc physics.ins-det | null | Combining the principle of magnetic flux quantization inside a
superconducting loop and existence of rigid platforms (i.e., solids,
non-deformable under the action of gravitational waves) a design for
gravitational wave antenna is suggested. This design could yield a non-resonant
detector, with modest sizes and capability to generate detectable signals for
gravitational waves from astrophysical sources.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 15:37:42 GMT"
},
{
"version": "v2",
"created": "Fri, 23 Dec 2011 18:29:04 GMT"
}
] | 2011-12-26T00:00:00 | [
[
"Gulian",
"A. M.",
""
]
] |
0704.3805 | Kunth Daniel | Kunth Daniel (Institut Astrophysique de Paris, France) | Starbursts and their contribution to metal enrichment | 10 pages; Proceedings of the conference held at La Palma: The Metal
Rich Universe, 2006. Eds G. Israelian et al. CUP | null | null | null | astro-ph | null | I review the properties of starburst galaxies, compare the properties of the
local ones with more distant starburts and examine their role in the metal
enrichment of the interstellar medium and the intergalactic-intracluster
medium. Metallicity is not an arrow of time and contrary to current belief
metal rich galaxies can also be found at high redshift.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 15:49:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Daniel",
"Kunth",
"",
"Institut Astrophysique de Paris, France"
]
] |
0704.3806 | Leonid P. Pryadko | Leonid P. Pryadko and Alexander N. Korotkov | Coherence of a Josephson phase qubit under partial-collapse measurement | 4p., 2eps figures | Phys. Rev. B 76, 100503(R) (2007) | 10.1103/PhysRevB.76.100503 | null | cond-mat.mes-hall cond-mat.other quant-ph | null | We discuss quantum evolution of a decaying state in relation to a recent
experiment of Katz et al. Based on exact analytical and numerical solutions of
a simple model, we identify a regime where qubit retains coherence over a
finite time interval independently of the rates of three competing decoherence
processes. In this regime, the quantum decay process can be continuously
monitored via a ``weak'' measurement without affecting the qubit coherence.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 15:54:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pryadko",
"Leonid P.",
""
],
[
"Korotkov",
"Alexander N.",
""
]
] |
0704.3807 | Marcio Mel\'endez | M. Melendez, M.A. Bautista and N.R. Badnell | Atomic data from the Iron Project. LXIV. Radiative transition rates and
collision strengths for Ca II | 8 pages, 4 figures. The atomic data from this work, including energy
levels, A-values, and effective collision strengths, is available in
electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr
(130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/ | null | 10.1051/0004-6361:20077262 | null | astro-ph | null | This work reports radiative transition rates and electron impact excitation
rate coefficients for levels of the n= 3, 4, 5, 6, 7, 8 configurations of Ca
II. The radiative data were computed using the Thomas-Fermi-Dirac central
potential method in the frozen core approximation and includes the polarization
interaction between the valence electron and the core using a model potential.
This method allows for configuration interactions (CI) and relativistic effects
in the Breit-Pauli formalism. Collision strengths in LS-coupling were
calculated in the close coupling approximation with the R-matrix method. Then,
fine structure collision strengths were obtained by means of the
intermediate-coupling frame transformation (ICFT) method which accounts for
spin-orbit coupling effects. We present extensive comparisons with the most
recent calculations and measurements for Ca II as well as a comparison between
the core polarization results and the "unpolarized" values. We find that core
polarization affects the computed lifetimes by up to 20%. Our results are in
very close agreement with recent measurements for the lifetimes of metastable
levels. The present collision strengths were integrated over a Maxwellian
distribution of electron energies and the resulting effective collision
strengths are given for a wide range of temperatures. Our effective collision
strengths for the resonance transitions are within ~11% from previous values
derived from experimental measurements, but disagree with latter computations
using the distorted wave approximation.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 17:17:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Melendez",
"M.",
""
],
[
"Bautista",
"M. A.",
""
],
[
"Badnell",
"N. R.",
""
]
] |
0704.3808 | Jakob Enemark | Jakob Enemark and Kim Sneppen | On Gene Duplication Models for Evolving Regulatory Networks | 14 pages, 7 figures | null | 10.1088/1742-5468/2007/11/P11007 | null | q-bio.PE q-bio.OT | null | Background: Duplication of genes is important for evolution of molecular
networks. Many authors have therefore considered gene duplication as a driving
force in shaping the topology of molecular networks. In particular it has been
noted that growth via duplication would act as an implicit way of preferential
attachment, and thereby provide the observed broad degree distributions of
molecular networks.
Results: We extend current models of gene duplication and rewiring by
including directions and the fact that molecular networks are not a result of
unidirectional growth. We introduce upstream sites and downstream shapes to
quantify potential links during duplication and rewiring. We find that this in
itself generates the observed scaling of transcription factors for genome sites
in procaryotes. The dynamical model can generate a scale-free degree
distribution, p(k)∝ 1/k^γ, with exponent γ=1 in the
non-growing case, and with γ>1 when the network is growing.
Conclusions: We find that duplication of genes followed by substantial
recombination of upstream regions could generate main features of genetic
regulatory networks. Our steady state degree distribution is however to broad
to be consistent with data, thereby suggesting that selective pruning acts as a
main additional constraint on duplicated genes. Our analysis shows that gene
duplication can only be a main cause for the observed broad degree
distributions, if there is also substantial recombinations between upstream
regions of genes.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 16:16:09 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 10:06:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Enemark",
"Jakob",
""
],
[
"Sneppen",
"Kim",
""
]
] |
0704.3809 | Laurent Cognet | David Lasne (CPMOH), Gerhard A. Blab (CPMOH), St\'ephane Berciaud
(CPMOH), Martin Heine (PCS), Laurent Groc (PCS), Daniel Choquet (PCS),
Laurent Cognet (CPMOH), Brahim Lounis (CPMOH) | Single NanoParticle Photothermal Tracking (SNaPT) of 5 nm gold beads in
live cells | null | Biophysical Journal 91, 12 (15/12/2006) 4598 | 10.1529/biophysj.106.089771 | null | physics.bio-ph physics.optics | null | Tracking individual nano-objets in live cells during arbitrary long times is
an ubiquitous need in modern biology. We present here a method for tracking
individual 5 nm gold nanoparticles on live cells. It relies on the photothermal
effect and the detection of the Laser Induced Scattering around a NanoAbsorber
(LISNA). The key point for recording trajectories at video rate is the use of a
triangulation procedure. The effectiveness of the method is tested against
Single fluorescent Molecule Tracking in live COS7 cells on subsecond time
scales. We further demonstrate recordings for several minutes of AMPA receptors
trajectories on the plasma membrane of live neurons. SNaPT has the unique
potential to record arbitrary long trajectory of membrane proteins using
non-fluorescent nanometer sized labels.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 19:52:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lasne",
"David",
"",
"CPMOH"
],
[
"Blab",
"Gerhard A.",
"",
"CPMOH"
],
[
"Berciaud",
"Stéphane",
"",
"CPMOH"
],
[
"Heine",
"Martin",
"",
"PCS"
],
[
"Groc",
"Laurent",
"",
"PCS"
],
[
"Choquet",
"Daniel",
"",
"PCS"
],
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3810 | Michael Mattes Dr. | T.Beck, M.Mattes and M.Sorg | Positronium Groundstate in Relativistic Schroedinger Theory | 80 pages and 2 figures | null | null | null | hep-th | null | The usefulness of the Relativistic Schr\"odinger Theory (RST) is studied in
the field of atomic physics. As a concrete demonstration, the positronium
groundstate is considered in great detail; especially the groundstate energy
$E_0$ is worked out in the non-relativistic approximation and under neglection
of the magnetic interactions between the positron and the electron. The
corresponding RST prediction $(E_0\simeq -6,48 [eV])$ misses the analogous
conventional Schr\"odinger result $(E_0\simeq -6,80 [eV])$ but is closer to the
latter than the corresponding Hartree approximation $(-2,65 [eV])$. The missing
binding energy of $6,80-6,48=0,32 [eV]$ can be attributed to the approximative
use of an SO(3) symmetric interaction potential which in RST, however, is
actually only SO(2) invariant against rotations around the z-axis. It is
expected that, with the correct use of an anisotropic interaction potential due
to the SO(2) symmetry, the RST predictions will come even closer to the
conventional Schr\"odinger result, where however the mathematical structure of
RST relies on exotic (i.e. double-valued) wave functions and on the
corresponding unconventional interaction potentials (e.g. Struve-Neumann
potential).
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 16:41:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Beck",
"T.",
""
],
[
"Mattes",
"M.",
""
],
[
"Sorg",
"M.",
""
]
] |
0704.3811 | Bartosz Kwa\'sniewski | B. K. Kwasniewski, A. V. Lebedev | Relative Cuntz-Pimsner Algebras, Partial Isometric Crossed Products and
Reduction of Relations | 13 pages, 1 table | null | null | null | math.OA math.FA | null | The article discusses the interrelation between relative Cuntz-Pimsner
algebras and partial isometric crossed products, and presents a procedure that
reduces any given Hilbert bimodule to the "smallest" Hilbert bimodule yielding
the same relative Cuntz-Pimsner algebra as the initial one. In the context of
crossed products this reduction procedure corresponds to reduction of
C*-dynamical systems.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 23:12:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kwasniewski",
"B. K.",
""
],
[
"Lebedev",
"A. V.",
""
]
] |
0704.3812 | Miloslav Znojil | Miloslav Znojil | Conditional observability | 21 pp incl. 10 fig | Phys. Lett. B 650 (2007) 440 - 446 | 10.1016/j.physletb.2007.05.054 | null | math-ph math.MP | null | For a quantum Hamiltonian H =H(p) the observability of the energies E may be
robust (whenever all E are real at all p) or, otherwise, conditional. Using a
pseudo-Hermitian family of N-state chain models H we discuss some generic
properties of conditionally observable spectra.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 18:24:21 GMT"
}
] | 2008-02-10T00:00:00 | [
[
"Znojil",
"Miloslav",
""
]
] |
0704.3813 | Armando Gil de Paz | B.F. Madore (1), A. Gil de Paz (2), O. Pevunova (3), I. Thompson (1)
((1) Carnegie Observatories, (2) Universidad Complutense de Madrid, (3) NED,
Caltech) | The Curious Case of NGC6908 | 17 pages, 8 figures, accepted for publication in AJ | Astron.J.134:314-320,2007 | 10.1086/518557 | null | astro-ph | null | The object NGC6908 was once thought to be simply a surface-brightness
enhancement in the eastern spiral arm of the nearby spiral galaxy NGC6907.
Based on an examination of near-infrared imaging, the object is shown in fact
to be a lenticular S0(6/7) galaxy hidden in the optical glare of the disk and
spiral structure of the larger galaxy. New radial velocities of NGC6908
(3,060+/-16 (emission); 3,113+/-73 km/s (absorption)) have been obtained at the
Baade 6.5m and the duPont 2.5m telescopes at Las Campanas, Chile placing
NGC6908 at the same expansion-velocity distance as NGC6907 (3,190+/-5 km/s),
eliminating the possibility of a purely chance line-of-sight coincidence. The
once-enigmatic asymmetries in the disk and outer spiral structure of NGC6907
are now explained as being due to an advanced merger event. Newly discovered
tails and debris in the outer reaches of this galaxy further support the merger
scenario for this system. This pair of galaxies is a rather striking example of
two objects discovered over 100 years ago, whose true nature was lost until
modern detectors operating at infrared wavelengths gave us a new
(high-contrast) look. Other examples of embedded merger remnants may also
reveal themselves in the growing samples of near-infrared imaging of nearby
galaxies; and a pilot study does reveal several other promising candidates for
follow-up observations.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 18:31:09 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Madore",
"B. F.",
""
],
[
"de Paz",
"A. Gil",
""
],
[
"Pevunova",
"O.",
""
],
[
"Thompson",
"I.",
""
]
] |
0704.3814 | Laurent Cognet | St\'ephane Berciaud (CPMOH), Laurent Cognet (CPMOH), Philippe Tamarat
(CPMOH), Brahim Lounis (CPMOH) | Observation of intrinsic size effects in the optical response of
individual gold nanoparticles | null | Nano Letters 5, 3 (15/02/2005) 515 | 10.1021/nl050062t | null | physics.optics cond-mat.other | null | The Photothermal Heterodyne Imaging method is used to study for the first
time the absorption spectra of individual gold nanoparticles with diameters
down to 5 nm. Intrinsic size effects wich result in a broadening of the Surface
Plasmon resonance are unambiguously observed. Dispersions in the peak energies
and homogeneous widths of the single particle resonances are revealed. The
experimental results are analysed within the frame of Mie theory.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 19:49:59 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 15:40:38 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Berciaud",
"Stéphane",
"",
"CPMOH"
],
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Tamarat",
"Philippe",
"",
"CPMOH"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3815 | Laurent Cognet | St\'ephane Berciaud (CPMOH), Laurent Cognet (CPMOH), Brahim Lounis
(CPMOH) | Photothermal Absorption Spectroscopy of Individual Semiconductor
Nanocrystals | null | Nano Letters 5, 11 (25/10/2005) 2160 | 10.1021/nl051805d | null | physics.optics cond-mat.other | null | Photothermal heterodyne detection is used to record the first
room-temperature absorption spectra of single CdSe/ZnS semiconductor
nanocrystals. These spectra are recorded in the high cw excitation regime, and
the observed bands are assigned to transitions involving biexciton and trion
states. Comparison with the single nanocrystals photoluminescence spectra leads
to the measurement of spectral Stokes shifts free from ensemble averaging.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 19:50:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Berciaud",
"Stéphane",
"",
"CPMOH"
],
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3816 | Laurent Cognet | Laurent Cognet (CPMOH), Catherine Tardin (CPMOH), David Boyer (CPMOH),
Daniel Choquet (PCS), Philippe Tamarat (CPMOH), Brahim Lounis (CPMOH) | Single metallic nanoparticle imaging for protein detection in cells | null | Proceeding of the national academy of sciences 100, 20
(30/09/2003) 11350 | 10.1073/pnas.1534635100 | null | physics.optics physics.bio-ph | null | We performed a visualization of membrane proteins labeled with 10-nm gold
nanoparticles in cells, using an all-optical method based on photothermal
interference contrast. The high sensitivity of the method and the stability of
the signals allows 3D imaging of individual nanoparticles without the drawbacks
of photobleaching and blinking inherent to fluorescent markers. A simple
analytical model is derived to account for the measurements of the signal
amplitude and the spatial resolution. The photothermal interference contrast
method provides an efficient, reproducible, and promising way to visualize low
amounts of proteins in cells by optical means.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 19:51:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Tardin",
"Catherine",
"",
"CPMOH"
],
[
"Boyer",
"David",
"",
"CPMOH"
],
[
"Choquet",
"Daniel",
"",
"PCS"
],
[
"Tamarat",
"Philippe",
"",
"CPMOH"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3817 | C. Miguel Arizmendi | D.G. Zarlenga, H.A. Larrondo, C.M. Arizmendi, and F. Family | Trapping mechanism in overdamped ratchets with quenched noise | 21 pages, 6 figures, to appear in PRE | Phys. Rev. E 75, 051101 (2007) | 10.1103/PhysRevE.75.051101 | null | cond-mat.stat-mech | null | A trapping mechanism is observed and proposed as the origin of the anomalous
behavior recently discovered in transport properties of overdamped ratchets
subject to external oscillatory drive in the presence of quenched noise. In
particular, this mechanism is shown to appear whenever the quenched disorder
strength is greater than a threshold value. The minimum disorder strength
required for the existence of traps is determined by studying the trap
structure in a disorder configuration space. An approximation to the trapping
probability density function in a disordered region of finite length included
in an otherwise perfect ratchet lattice is obtained. The mean velocity of the
particles and the diffusion coefficient are found to have a non-monotonic
dependence on the quenched noise strength due to the presence of the traps.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 20:10:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zarlenga",
"D. G.",
""
],
[
"Larrondo",
"H. A.",
""
],
[
"Arizmendi",
"C. M.",
""
],
[
"Family",
"F.",
""
]
] |
0704.3818 | Galina L. Klimchitskaya | B. Geyer, G.L. Klimchitskaya, V.M. Mostepanenko | Analytic approach to the thermal Casimir force between metal and
dielectric | 34 pages, 3 figures, elsart.cls is used, to appear in Ann. Phys.
(N.Y.), 2007 | Annals of Physics, v.323, p.291-316 (2008). | 10.1016/j.aop.2007.04.005 | null | quant-ph | null | The analytic asymptotic expressions for the Casimir free energy, pressure and
entropy at low temperature in the configuration of one metal and one dielectric
plate are obtained. For this purpose we develop the perturbation theory in a
small parameter proportional to the product of the separation between the
plates and the temperature. This is done using both the simplified model of an
ideal metal and of a dielectric with constant dielectric permittivity and for
the realistic case of the metal and dielectric with frequency-dependent
dielectric permittivities. The analytic expressions for all related physical
quantities at high temperature are also provided. The obtained analytic results
are compared with numerical computations and good agreement is found. We
demonstrate for the first time that the Lifshitz theory, when applied to the
configuration of metal-dielectric, satisfies the requirements of thermodynamics
if the static dielectric permittivity of a dielectric plate is finite. If it is
infinitely large, the Lifshitz formula is shown to violate the Nernst heat
theorem. The implications of these results for the thermal quantum field theory
in Matsubara formulation and for the recent measurements of the Casimir force
between metal and semiconductor surfaces are discussed.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 20:11:21 GMT"
}
] | 2008-01-13T00:00:00 | [
[
"Geyer",
"B.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] |
0704.3819 | Jagannatha Senesi | Vyjayanthi Chari, Ghislain Fourier, Prasad Senesi | Weyl modules for the twisted loop algebras | 19 pages, acknowledgment of NSF support added on page 1 | J. Algebra 319 (2008), no. 12, 5016-5038 | null | null | math.RT math.QA | null | The notion of a Weyl module, previously defined for the untwisted affine
algebras, is extended here to the twisted affine algebras. We describe an
identification of the Weyl modules for the twisted affine algebras with
suitably chosen Weyl modules for the untwisted affine algebras. This
identification allows us to use known results in the untwisted case to compute
the dimensions and characters of the Weyl modules for the twisted algebras.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 22:08:01 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 19:09:03 GMT"
}
] | 2012-12-18T00:00:00 | [
[
"Chari",
"Vyjayanthi",
""
],
[
"Fourier",
"Ghislain",
""
],
[
"Senesi",
"Prasad",
""
]
] |
0704.3820 | Stephane Gaubert | Jean Clairambault, Stephane Gaubert, and Benoit Perthame | An inequality for the Perron and Floquet eigenvalues of monotone
differential systems and age structured equations | 7 pages, in English, with an abridged French version | Comptes Rendus Mathematique, Volume 345, Issue 10, 15 November
2007, Pages 549-554 | 10.1016/j.crma.2007.10.001 | null | math.SP math.AP | null | For monotone linear differential systems with periodic coefficients, the
(first) Floquet eigenvalue measures the growth rate of the system. We define an
appropriate arithmetico-geometric time average of the coefficients for which we
can prove that the Perron eigenvalue is smaller than the Floquet eigenvalue. We
apply this method to Partial Differential Equations, and we use it for an
age-structured systems of equations for the cell cycle. This opposition between
Floquet and Perron eigenvalues models the loss of circadian rhythms by cancer
cells.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 22:05:30 GMT"
}
] | 2007-12-04T00:00:00 | [
[
"Clairambault",
"Jean",
""
],
[
"Gaubert",
"Stephane",
""
],
[
"Perthame",
"Benoit",
""
]
] |
0704.3821 | Aminul Huq | Aminul Huq | Compositions of Graphs Revisited | 6 pages | null | null | null | math.CO | null | The idea of graph compositions, which was introduced by A. Knopfmacher and M.
E. Mays, generalizes both ordinary compositions of positive integers and
partitions of finite sets. In their original paper they developed formulas,
generating functions, and recurrence relations for composition counting
functions for several families of graphs. Here we show that some of the results
involving compositions of bipartite graphs can be derived more easily using
exponential generating functions.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 22:42:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Huq",
"Aminul",
""
]
] |
0704.3822 | Eitan Tadmor | Shlomo Engelberg and Eitan Tadmor | Recovery of edges from spectral data with noise -- a new perspective | null | null | null | null | math.NA math.ST stat.TH | null | We consider the problem of detecting edges in piecewise smooth functions from
their N-degree spectral content, which is assumed to be corrupted by noise.
There are three scales involved: the "smoothness" scale of order 1/N, the noise
scale of order $\eta$ and the O(1) scale of the jump discontinuities. We use
concentration factors which are adjusted to the noise variance, $\eta$ >> 1/N,
in order to detect the underlying O(1)-edges, which are separated from the
noise scale, $\eta$ << 1.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 23:37:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Engelberg",
"Shlomo",
""
],
[
"Tadmor",
"Eitan",
""
]
] |
0704.3823 | Xuexi Yi | W. Wang, L. B. Fu, and X. X. Yi | Effect of Decoherence on the Dynamics of Bose-Einstein Condensates in a
Double-well Potential | for color figures, see PRA | Phys. Rev. A 75,045601(2007) | 10.1103/PhysRevA.75.045601 | null | quant-ph | null | We study the dynamics of a Bose-Einstein condensate in a double-well
potential in the mean-field approximation. Decoherence effects are considered
by analyzing the couplings of the condensate to environments. Two kinds of
coupling are taken into account. With the first kind of coupling dominated, the
decoherence can enhance the self-trapping by increasing the damping of the
oscillations in the dynamics, while the decoherence from the second kind of
condensate-environment coupling leads to spoiling of the quantum tunneling and
self-trapping.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 00:01:43 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Wang",
"W.",
""
],
[
"Fu",
"L. B.",
""
],
[
"Yi",
"X. X.",
""
]
] |
0704.3824 | Junren Shi | Junren Shi, G. Vignale, Di Xiao, Qian Niu | Quantum Theory of Orbital Magnetization and its Generalization to
Interacting Systems | Accepted by Phys. Rev. Lett | null | 10.1103/PhysRevLett.99.197202 | null | cond-mat.mes-hall | null | Based on standard perturbation theory, we present a full quantum derivation
of the formula for the orbital magnetization in periodic systems. The
derivation is generally valid for insulators with or without a Chern number,
for metals at zero or finite temperatures, and at weak as well as strong
magnetic fields. The formula is shown to be valid in the presence of
electron-electron interaction, provided the one-electron energies and wave
functions are calculated self-consistently within the framework of the exact
current and spin density functional theory.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 00:56:00 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 05:50:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shi",
"Junren",
""
],
[
"Vignale",
"G.",
""
],
[
"Xiao",
"Di",
""
],
[
"Niu",
"Qian",
""
]
] |
0704.3825 | Danny Calegari | Danny Calegari | Word length in surface groups with characteristic generating sets | 6 pages | Proc. Amer. Math. Soc. 136 (2008), no. 7, 2631-2637 | null | null | math.GR math.GT | null | A subset of a group is characteristic if it is invariant under every
automorphism of the group. We study word length in fundamental groups of closed
hyperbolic surfaces with respect to characteristic generating sets consisting
of a finite union of orbits of the automorphism group, and show that the
translation length of any element with nonzero crossing number is positive, and
bounded below by a constant depending only (and explicitly) on a bound on the
crossing numbers of generating elements. This answers a question of B. Farb.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 01:38:15 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Apr 2007 22:14:54 GMT"
},
{
"version": "v3",
"created": "Tue, 11 Dec 2007 00:32:20 GMT"
}
] | 2008-04-07T00:00:00 | [
[
"Calegari",
"Danny",
""
]
] |
0704.3826 | Mark Ya. Azbel' | Mark Ya. Azbel | Non-coding DNA programs express adaptation and its universal law | Refined version 19 pages, 10 figs | null | null | null | q-bio.GN cond-mat.other nlin.AO q-bio.OT q-bio.PE q-bio.QM | null | Significant fraction (98.5% in humans) of most animal genomes is non- coding
dark matter. Its largely unknown function (1-5) is related to programming
(rather than to spontaneous mutations) of accurate adaptation to rapidly
changing environment. Programmed adaptation to the same universal law for
non-competing animals from anaerobic yeast to human is revealed in the study of
their extensively quantified mortality (6-21). Adaptation of animals with
removed non-coding DNA fractions may specify their contribution to genomic
programming. Emergence of new adaptation programs and their (non-Mendelian)
heredity may be studied in antibiotic mini-extinctions (22-24). On a large
evolutionary scale rapid universal adaptation was vital for survival, and
evolved, in otherwise lethal for diverse species major mass extinctions
(25-28). Evolutionary and experimental data corroborate these conclusions
(6-21, 29-32). Universal law implies certain biological universality of diverse
species, thus quantifies applicability of animal models to humans). Genomic
adaptation programming calls for unusual approach to its study and implies
unanticipated perspectives, in particular, directed biological changes.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 05:32:50 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 16:23:54 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Azbel",
"Mark Ya.",
""
]
] |
0704.3827 | Yin Furong | Furong Yin | Neutrino mixing matrix in the 3-3-1 model with heavy leptons and $A_4$
symmetry | 10 pages | Phys.Rev.D75:073010,2007 | 10.1103/PhysRevD.75.073010 | null | hep-ph | null | We study the lepton sector in the model based on the local gauge group
$SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ which do not contain particles with
exotic electric charges. The seesaw mechanism and discrete $A_4$ symmetry are
introduced into the model to understand why neutrinos are especially light and
the observed pattern of neutrino mixing. The model provides a method for
obtaining the tri-bimaximal mixing matrix in the leading order. A non-zero
mixing angle $V_{e3}$ presents in the modified mixing matrix.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 05:41:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yin",
"Furong",
""
]
] |
0704.3828 | Wei Zhengjun | Zhengjun Wei, Peng Zhou, Xiaobao Liu, Jindong Wang, Changjun Liao,
Jianping Guo, Rihao Li, and Songhao Liu | An integral gated mode single photon detector at telecom wavelengths | word to PDF, 3 pages with 4 figures | null | 10.1088/0022-3727/40/22/011 | null | physics.optics | null | We demonstrate an integral gated mode single photon detector at telecom
wavelengths. The charge number of an avalanche pulse rather than the peak
current is monitored for single-photon detection. The transient spikes in
conventional gated mode operation are canceled completely by integrating, which
enables one to improve the performance of single photon detector greatly with
the same avalanche photodiode. This method has achieved a detection efficiency
of 29.9% at the dark count probability per gate equal to 5.57E-6/gate
(1.11E-6/ns) at 1550nm.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 06:58:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wei",
"Zhengjun",
""
],
[
"Zhou",
"Peng",
""
],
[
"Liu",
"Xiaobao",
""
],
[
"Wang",
"Jindong",
""
],
[
"Liao",
"Changjun",
""
],
[
"Guo",
"Jianping",
""
],
[
"Li",
"Rihao",
""
],
[
"Liu",
"Songhao",
""
]
] |
0704.3829 | Yue Yu | Yue Yu | Gauge symmetry in Kitaev-type spin models and index theorems on odd
manifolds | longer version, 12 pages, to be published in Nucl. Phys. B | Nucl.Phys.B799:345-363,2008 | 10.1016/j.nuclphysb.2008.01.029 | null | cond-mat.str-el cond-mat.mes-hall hep-th | null | We construct an exactly soluble spin-$\frac{1}2$ model on a honeycomb
lattice, which is a generalization of Kitaev model. The topological phases of
the system are analyzed by study of the ground state sector of this model, the
vortex-free states. Basically, there are two phases, A phase and B phase. The
behaviors of both A and B phases may be studied by mapping the ground state
sector into a general p-wave paired states of spinless fermions with tunable
pairing parameters on a square lattice. In this p-wave paired state theory, the
A phase is shown to be the strong paired phase, an insulating phase. The B
phase may be either gapped or gapless determined by the generalized inversion
symmetry is broken or not. The gapped B is the weak pairing phase described by
either the Moore-Read Pfaffian state of the spinless fermions or anti-Pfaffian
state of holes depending on the sign of the next nearest neighbor hopping
amplitude. A phase transition between Pfaffian and anti-Pfaffian states are
found in the gapped B phase. Furthermore, we show that there is a hidden SU(2)
gauge symmetry in our model. In the gapped B phase, the ground state has a
non-trivial topological number, the spectral first Chern number or the chiral
central charge, which reflects the chiral anomaly of the edge state. We proved
that the topological number is identified to the reduced eta-invariant and this
anomaly may be cancelled by a bulk Wess-Zumino term of SO(3) group through an
index theorem in 2+1 dimensions.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 07:02:16 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 16:39:21 GMT"
},
{
"version": "v3",
"created": "Tue, 22 Jan 2008 09:09:43 GMT"
}
] | 2010-11-23T00:00:00 | [
[
"Yu",
"Yue",
""
]
] |
0704.3830 | Antonio Badia | A. Bad\'ia-Maj\'os and C. L\'opez | Critical state analysis of orthogonal flux interactions in pinned
superconductors | 11 figures, submitted | null | 10.1103/PhysRevB.76.054504 | null | cond-mat.supr-con | null | We show that, based on the critical state model for flux-line pinning in hard
superconductors, one can assess the magnetic moment relaxation induced by the
oscillations of a perpendicular magnetic field. Our theory follows a recent
proposal of using phenomenological 2D modeling for the description of crossed
field dynamics in high-T$_c$ superconductors [{\tt arXiv:cond-mat/0703330}].
Stationary regimes with either saturation to metastable configurations, or
complete decay to the thermodynamic equilibrium are obtained. The transition
between both types of response is related to the disappearance of a flux free
core within the sample. As a common feature, a step-like dependence in the time
relaxation is predicted for both cases. The theory may be applied to long bars
of arbitrary and non homogeneous cross section, under in-plane magnetic field
processes.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 07:48:11 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Badía-Majós",
"A.",
""
],
[
"López",
"C.",
""
]
] |
0704.3831 | Philip Chang | P. Chang, R. Murray-Clay, E. Chiang, E. Quataert | The Origin of the Young Stars in the Nucleus of M31 | 10 pages, 7 figures, accepted by ApJ, changes made from referee
suggestions | null | 10.1086/521018 | null | astro-ph | null | The triple nucleus of M31 consists of a population of old red stars in an
eccentric disk (P1 and P2) and another population of younger A stars in a
circular disk (P3) around M31's central supermassive black hole (SMBH). We
argue that P1 and P2 determine the maximal radial extent of the younger A star
population and provide the gas that fueled the starburst that generated P3. The
eccentric stellar disk creates an $m=1$ non-axisymmetric perturbation to the
potential. This perturbed potential drives gas into the inner parsec around the
SMBH, if the pattern speed of the eccentric stellar disk is $\Omega_p \lesssim
3-10 {\rm km s^{-1} pc^{-1}}$. We show that stellar mass loss from P1 and P2 is
sufficient to create a gravitationally unstable gaseous disk of $\sim
10^5\Msun$ every $0.1-1$ Gyrs, consistent with the 200 Myr age of P3. Similar
processes may act in other systems to produce very compact nuclear starbursts.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 07:57:15 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 20:29:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chang",
"P.",
""
],
[
"Murray-Clay",
"R.",
""
],
[
"Chiang",
"E.",
""
],
[
"Quataert",
"E.",
""
]
] |
0704.3832 | Philip Chang | P. Chang, A. Spitkovsky, J. Arons | Long Term Evolution of Magnetic Turbulence in Relativistic Collisionless
Shocks: Electron-Positron Plasmas | 10 pages, 6 figures, accepted to ApJ; Downsampled version for arXiv.
Full resolution figures available at
http://astro.berkeley.edu/~pchang/full_res_weibel.pdf | null | 10.1086/524764 | null | astro-ph | null | We study the long term evolution of magnetic fields generated by a
collisionless relativistic $e^+e^-$ shock which is initially unmagnetized. Our
2D particle-in-cell numerical simulations show that downstream of such a
Weibel-mediated shock, particle distributions are close to isotropic,
relativistic Maxwellians, and the magnetic turbulence is highly intermittent
spatially, with the non-propagating magnetic fields forming relatively isolated
regions with transverse dimension $\sim 10-20$ skin depths. These structures
decay in amplitude, with little sign of downstream merging. The fields start
with magnetic energy density $\sim (0.1-0.2)$ of the upstream kinetic energy
within the shock transition, but rapid downstream decay drives the fields to
much smaller values, below $10^{-3}$ of equipartition after $10^3$ skin depths.
In an attempt to construct a theory that follows field decay to these smaller
values, we explore the hypothesis that the observed damping is a variant of
Landau damping in an unmagnetized plasma. The model is based on the small value
of the downstream magnetic energy density, which suggests that particle orbits
are only weakly perturbed from straight line motion, if the turbulence is
homogeneous. Using linear kinetic theory applied to electromagnetic fields in
an isotropic, relativistic Maxwellian plasma, we find a simple analytic form
for the damping rates, $\gamma_k$, in two and three dimensions for small
amplitude, subluminous electromagnetic fields. We find that magnetic energy
does damp due to phase mixing of current carrying particles as $(\omega_p
t)^{-q}$ with $q \sim 1$. (abridged)
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 09:32:34 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 16:08:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chang",
"P.",
""
],
[
"Spitkovsky",
"A.",
""
],
[
"Arons",
"J.",
""
]
] |
0704.3833 | Zhen-Qiang Yin | Zhen-Qiang Yin, Zheng-Fu Han, Fang-Wen Sun, Guang-Can Guo | Decoy State Quantum Key Distribution With Modified Coherent State | 4 pages, 4 figures | PHYSICAL REVIEW A 76, 014304 (2007) | 10.1103/PhysRevA.76.014304 | null | quant-ph | null | To beat PNS attack, decoy state quantum key distribution (QKD) based on
coherent state has been studied widely. We present a decoy state QKD protocol
with modified coherent state (MCS). By destruction quantum interference, MCS
with fewer multi-photon events can be get, which may improve key bit rate and
security distance of QKD. Through numerical simulation, we show about 2-dB
increment on security distance for BB84 protocol.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 09:34:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yin",
"Zhen-Qiang",
""
],
[
"Han",
"Zheng-Fu",
""
],
[
"Sun",
"Fang-Wen",
""
],
[
"Guo",
"Guang-Can",
""
]
] |
0704.3834 | Tanyu Bonev | Tanyu Bonev, Galin Borisov, Andon Kostov, Abedin Abedin, Gordana
Apostolovska, Bonka Bilkina, Zahary Donchev, Violeta Ivanova, Vladimir
Krumov, Yanko Nikolov, Evgeni Ovcharov, Vesselka Radeva, Ivaylo Stanev | Observations of Comet C/LINEAR (2004B1) between2 and 3 AU heliocentric
distance | 6 pages, 6 figures, gzipped tar file. To appear in Proceeding of the
1st conference of BAS (Bulgarian Astronomical Society): "25 years National
Astronomical Observatory" | null | null | null | astro-ph | null | We present R-band observations of comet C2004B1 obtained in the period June,
21 - August 20, 2006. The data have been reduced to surface brightness maps,
light curves, and mean radial profiles of the coma. In two cases a decrease of
the brightness was recorded, which lasted for several days. The brightness
decrease was accompanied by morphological changes in the coma.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 10:16:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bonev",
"Tanyu",
""
],
[
"Borisov",
"Galin",
""
],
[
"Kostov",
"Andon",
""
],
[
"Abedin",
"Abedin",
""
],
[
"Apostolovska",
"Gordana",
""
],
[
"Bilkina",
"Bonka",
""
],
[
"Donchev",
"Zahary",
""
],
[
"Ivanova",
"Violeta",
""
],
[
"Krumov",
"Vladimir",
""
],
[
"Nikolov",
"Yanko",
""
],
[
"Ovcharov",
"Evgeni",
""
],
[
"Radeva",
"Vesselka",
""
],
[
"Stanev",
"Ivaylo",
""
]
] |
0704.3835 | K. Y. Michael Wong | K. Y. Michael Wong and David Saad | Minimizing Unsatisfaction in Colourful Neighbourhoods | 28 pages, 12 figures, substantially revised with additional
explanation | J. Phys. A: Math. Theor. 41, 324023 (2008). | 10.1088/1751-8113/41/32/324023 | null | cs.DS cond-mat.dis-nn cs.CC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Colouring sparse graphs under various restrictions is a theoretical problem
of significant practical relevance. Here we consider the problem of maximizing
the number of different colours available at the nodes and their
neighbourhoods, given a predetermined number of colours. In the analytical
framework of a tree approximation, carried out at both zero and finite
temperatures, solutions obtained by population dynamics give rise to estimates
of the threshold connectivity for the incomplete to complete transition, which
are consistent with those of existing algorithms. The nature of the transition
as well as the validity of the tree approximation are investigated.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 10:03:00 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 04:18:58 GMT"
},
{
"version": "v3",
"created": "Tue, 1 Jul 2008 17:43:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wong",
"K. Y. Michael",
""
],
[
"Saad",
"David",
""
]
] |
0704.3836 | Akihiro Doi | Akihiro Doi, Kenta Fujisawa, Makoto Inoue, Kiyoaki Wajima, Hiroshi
Nagai, Keiichiro Harada, Kousuke Suematsu, Asao Habe, Mareki Honma, Noriyuki
Kawaguchi, Eiji Kawai, Hideyuki Kobayashi, Yasuhiro Koyama, Hiromitsu Kuboki,
Yasuhiro Murata, Toshihiro Omodaka, Kazuo Sorai, Hiroshi Sudou, Hiroshi
Takaba, Kazuhiro Takashima, Koji Takeda, Sayaka Tamura, Ken-ichi Wakamatsu | Japanese VLBI Network observations of radio-loud narrow-line Seyfert 1
galaxies | 8 pages, 2 figures, accepted for publication in PASJ | PASJ 59 703, 2007 | 10.1093/pasj/59.4.703 | null | astro-ph | null | We performed phase-reference very long baseline interferometry (VLBI)
observations on five radio-loud narrow-line Seyfert 1 galaxies (NLS1s) at 8.4
GHz with the Japanese VLBI Network (JVN). Each of the five targets (RXS
J08066+7248, RXS J16290+4007, RXS J16333+4718, RXS J16446+2619, and B3
1702+457) in milli-Jansky levels were detected and unresolved in
milli-arcsecond resolutions, i.e., with brightness temperatures higher than
10^7 K. The nonthermal processes of active galactic nuclei (AGN) activity,
rather than starbursts, are predominantly responsible for the radio emissions
from these NLS1s. Out of the nine known radio-loud NLS1s, including the ones
chosen for this study, we found that the four most radio-loud objects
exclusively have inverted spectra. This suggests a possibility that these NLS1s
are radio-loud due to Doppler beaming, which can apparently enhance both the
radio power and the spectral frequency.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 10:07:29 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Doi",
"Akihiro",
""
],
[
"Fujisawa",
"Kenta",
""
],
[
"Inoue",
"Makoto",
""
],
[
"Wajima",
"Kiyoaki",
""
],
[
"Nagai",
"Hiroshi",
""
],
[
"Harada",
"Keiichiro",
""
],
[
"Suematsu",
"Kousuke",
""
],
[
"Habe",
"Asao",
""
],
[
"Honma",
"Mareki",
""
],
[
"Kawaguchi",
"Noriyuki",
""
],
[
"Kawai",
"Eiji",
""
],
[
"Kobayashi",
"Hideyuki",
""
],
[
"Koyama",
"Yasuhiro",
""
],
[
"Kuboki",
"Hiromitsu",
""
],
[
"Murata",
"Yasuhiro",
""
],
[
"Omodaka",
"Toshihiro",
""
],
[
"Sorai",
"Kazuo",
""
],
[
"Sudou",
"Hiroshi",
""
],
[
"Takaba",
"Hiroshi",
""
],
[
"Takashima",
"Kazuhiro",
""
],
[
"Takeda",
"Koji",
""
],
[
"Tamura",
"Sayaka",
""
],
[
"Wakamatsu",
"Ken-ichi",
""
]
] |
0704.3837 | Yaroslav Kartashov | A. Szameit, Y. V. Kartashov, F. Dreisow, T. Pertsch, S. Nolte, A.
Tunnermann, L. Torner | Observation of two-dimensional surface solitons in anisotropic waveguide
arrays | 13 pages, 4 figures | Physical Review Letters 98, 173903 (2007) | 10.1103/PhysRevLett.98.173903 | null | physics.optics nlin.PS | null | We report on the experimental observation of two-dimensional surface waves
localized at the edge or in the corner of femtosecond laser-written waveguide
arrays in fused silica. Increasing the power of the input beam allows one to
observe a clear transition from a linear diffraction pattern to localized
nonlinear surface states, which can exist at the interface only above a certain
power threshold.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 11:11:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Szameit",
"A.",
""
],
[
"Kartashov",
"Y. V.",
""
],
[
"Dreisow",
"F.",
""
],
[
"Pertsch",
"T.",
""
],
[
"Nolte",
"S.",
""
],
[
"Tunnermann",
"A.",
""
],
[
"Torner",
"L.",
""
]
] |
0704.3838 | Shu Luo | Wei Chao, Shu Luo, Zhi-zhong Xing | Neutrino Mixing and Leptogenesis in Type-II Seesaw Scenarios with
Left-Right Symmetry | RevTex 14 pages, 2 PS figures. Slight modifications made for the
text. Accepted for publication in Phys. Lett. B | Phys.Lett.B659:281-289,2008 | 10.1016/j.physletb.2007.11.028 | null | hep-ph | null | We propose two Type-II seesaw scenarios for the neutrino mass matrix in the
left-right symmetric model, in which the Higgs triplet Yukawa coupling matrix
takes the appealing Friedberg-Lee texture. We show that the nearly
tri-bimaximal neutrino mixing pattern, which is especially favored by current
neutrino oscillation data, can be obtained from both scenarios. We also show
that the cosmological baryon number asymmetry can naturally be interpreted in
these two scenarios via the flavor-independent leptogenesis mechanism.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 12:02:33 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 10:29:04 GMT"
},
{
"version": "v3",
"created": "Sun, 18 Nov 2007 06:31:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chao",
"Wei",
""
],
[
"Luo",
"Shu",
""
],
[
"Xing",
"Zhi-zhong",
""
]
] |
0704.3839 | Boyko Mihov | Boyko Mihov and Lyuba Slavcheva-Mihova | Multiband optical surface brightness profile decompositions of the
Seyfert galaxies Mrk 79 and NGC 5548 | A poster presented at the scientific conference dedicated to the
25-th anniversary of the Rozhen National Astronomical Observatory of Bulgaria
(November 11, 2006). Some typos corrected | Bulg. Astron. J. 8 (2006) 139 | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present preliminary results of the Johnson-Cousins (U)BVRI surface
brightness profile decompositions of the Seyfert galaxies Mrk 79 and NGC 5548.
The profiles were modelled as a sum of a Gaussian law for the nucleus, a Sersic
law for the bulge and an exponent law for the disk. A flat bar was added to the
model profile of Mrk 79. The parameters and the total magnitudes of the
structural components were derived.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 12:52:46 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jan 2010 08:11:28 GMT"
},
{
"version": "v3",
"created": "Mon, 1 Feb 2010 11:17:00 GMT"
}
] | 2010-02-01T00:00:00 | [
[
"Mihov",
"Boyko",
""
],
[
"Slavcheva-Mihova",
"Lyuba",
""
]
] |
0704.3840 | Labib Haddad | Barben-Jean Coffi-Nketsia and Labib Haddad | Produit d'entrelacement et action triangulaire d'alg\`ebres de Lie | The french version (p. 1-9) is followed by a "moderately detailed"
english summary (p. 9-15) | null | null | null | math.RT | null | Formal actions of Lie algebras over vector spaces are introduced in a purely
algebraic way, as a mimic of infinitesimal operations of Banach Lie algebras
over Banach analytic manifolds. In analogy with the case of abstract groups,
complete wreath products and triangular actions are then defined for Lie
algebras acting "en cascade" over vector spaces. Finally, a Kaloujnine-Krasner
type theorem for Lie algebra extensions is proved.
-----
En mimant les lois d'op\'erations infinit\'esimales des alg\`ebres de Lie sur
les vari\'et\'e s analytiques banachiques, on introduit de mani\`ere purement
alg\`ebrique la notion d'action formelle d'une alg\`ebre de Lie sur un espace
vectoriel. Ensuite, par analogie avec le cas des groupes abstraits, et en
faisant op\'erer les alg\`ebres de Lie "en cascade", on d\'efinit produit
d'entrelacement ("wreath product") et action triangulaire pour les alg\`ebres
de Lie. On d\'emontre enfin un th\'eor\`eme du type Kaloujnine-Krasner pour les
extensions d'alg\`ebres de Lie.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 13:00:56 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Coffi-Nketsia",
"Barben-Jean",
""
],
[
"Haddad",
"Labib",
""
]
] |
0704.3841 | Stephane Udry | S. Udry (1), X. Bonfils (2), X. Delfosse (3), T. Forveille (3), M.
Mayor (1), C. Perrier (3), F. Bouchy (4), C. Lovis (1), F. Pepe (1), D.
Queloz (1), J.-L. Bertaux (5) ((1) Observatoire de Geneve, Universit\'e de
Geneve, Switzerland, (2) Centro de Astronomia e Astrofisica da Universidade
de Lisboa, Portugal, (3) Laboratoire d'Astrophysique, Observatoire de
Grenoble, Universite J. Fourier, France, (4) Institut d'Astrophysique de
Paris, France, (5) Service d'A\'eronomie du CNRS/IPSL,
Verri\`eres-le-Buisson, France) | The HARPS search for southern extra-solar planets XI. Super-Earths (5 &
8 M_Earth) in a 3-planet system | Revised version resubmitted to A&A Letters, 5 pages, 4 figures | Astron.Astrophys.469:L43-L47,2007 | 10.1051/0004-6361:20077612 | null | astro-ph | null | This Letter reports on the detection of two super-Earth planets in the Gl581
system, already known to harbour a hot Neptune. One of the planets has a mass
of 5 M_Earth and resides at the ``warm'' edge of the habitable zone of the
star. It is thus the known exoplanet which most resembles our own Earth. The
other planet has a 7.7 M_Earth mass and orbits at 0.25 AU from the star, close
to the ``cold'' edge of the habitable zone. These two new light planets around
an M3 dwarf further confirm the formerly tentative statistical trend for i)
many more very low-mass planets being found around M dwarfs than around
solar-type stars and ii) low-mass planets outnumbering Jovian planets around M
dwarfs.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 13:18:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Udry",
"S.",
""
],
[
"Bonfils",
"X.",
""
],
[
"Delfosse",
"X.",
""
],
[
"Forveille",
"T.",
""
],
[
"Mayor",
"M.",
""
],
[
"Perrier",
"C.",
""
],
[
"Bouchy",
"F.",
""
],
[
"Lovis",
"C.",
""
],
[
"Pepe",
"F.",
""
],
[
"Queloz",
"D.",
""
],
[
"Bertaux",
"J. -L.",
""
]
] |
0704.3842 | Yuri Izotov I. | Y. I. Izotov (1), T. X. Thuan (2) ((1) Main Astronomical Observatory,
Kyiv, Ukraine, (2) University of Virginia, Charlottesville, USA) | MMT observations of new extremely metal-poor emission-line galaxies in
the Sloan Digital Sky Survey | 28 pages, 3 figures. Accepted for publication in the Astrophysical
Journal | Astrophys.J.665:1115-1128,2007 | 10.1086/519922 | null | astro-ph | null | We present 6.5-meter MMT spectrophotometry of 20 H II regions in 13 extremely
metal-poor emission-line galaxies selected from the Data Release 5 of the Sloan
Digital Sky Survey to have [O III] 4959/Hbeta < 1 and [N II] 6583/Hbeta < 0.05.
The electron temperature-sensitive emission line [O III] 4363 is detected in 13
H II regions allowing a direct abundance determination. The oxygen abundance in
the remaining H II regions is derived using a semi-empirical method. The oxygen
abundance of the galaxies in our sample ranges from 12+logO/H ~ 7.1 to ~ 7.8,
with 10 H II regions having an oxygen abundance lower than 7.5. The lowest
oxygen abundances, 12+logO/H = 7.14+/-0.03 and 7.13+/-0.07, are found in two H
II regions of the blue compact dwarf galaxy SDSSJ0956+2849=DDO 68, making it
the second most-metal deficient emission-line galaxy known, after SBS
0335-052W.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 13:25:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Izotov",
"Y. I.",
""
],
[
"Thuan",
"T. X.",
""
]
] |
0704.3843 | Louis Theran | Ruth Haas, Audrey Lee, Ileana Streinu, and Louis Theran | Characterizing Sparse Graphs by Map Decompositions | null | Characterizing sparse graphs by map decompositions. J. Combin.
Math. Combin. Comput. 62 (2007), 3--11 | null | null | math.CO | null | A {\bf map} is a graph that admits an orientation of its edges so that each
vertex has out-degree exactly 1. We characterize graphs which admit a
decomposition into $k$ edge-disjoint maps after: (1) the addition of {\it any}
$\ell$ edges; (2) the addition of {\it some} $\ell$ edges. These graphs are
identified with classes of {\it sparse} graphs; the results are also given in
matroidal terms.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 14:10:18 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Haas",
"Ruth",
""
],
[
"Lee",
"Audrey",
""
],
[
"Streinu",
"Ileana",
""
],
[
"Theran",
"Louis",
""
]
] |
0704.3844 | Assaf Hasson | Assaf Hasson, Alf Onshuus | Unstable structures definable in o-minimal theories | null | null | null | null | math.LO | null | Let M be an o-minimal structure with elimination of imaginaries, N an
unstable structure definable in M. Then there exists X, interpretable in N,
such that X with all the structure induced from N is o-minimal. In particular X
is linearly ordered.
As part of the proof we show: Theorem 1: If the M-dimenson of N is 1 then any
1-N-type is either strongly stable or finite by o-minimal. Theorem 2: If N is
N-minimal then it is 1-M-dimensional.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 14:52:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hasson",
"Assaf",
""
],
[
"Onshuus",
"Alf",
""
]
] |
0704.3845 | Michael Bordag | M. Bordag | On the interaction of a charge with a thin plasma sheet | 26 pages | null | 10.1103/PhysRevD.76.065011 | null | quant-ph | null | The interaction of the electromagnetic field with a two dimensional plasma
sheet intended to describe the pi-electrons of a carbon nano-tube or a $C_{60}$
molecule is investigated. By integrating out first the displacement field of
the plasma or first the electromagnetic field different representations for
quantities like the Casimir energy are derived which are shown to be consistent
with one another. Starting from the covariant gauge for the electromagnetic
field it is shown that the matching conditions to which the presence of the
plasma sheet can be reduced are different from the commonly used ones. The
difference in the treatments does not show up in the Casimir force between two
parallel sheets, but it is present in the Casimir-Polder force between a charge
or a neutral atom and a sheet. At once, since the plasma sheet is a
regularization of the conductor boundary conditions, this sheds light on the
difference in physics found earlier in the realization of conductor boundary
conditions as 'thin' or 'thick' boundary conditions in
Phys.Rev.D70(2004)085010.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 15:13:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bordag",
"M.",
""
]
] |
0704.3846 | Vasiliy Kantsler | Vasiliy Kantsler, Enrico Segre and Victor Steinberg | Vesicle dynamics in elongation flow: Wrinkling instability and bud
formation | 4 pages, 4 figures | Physical Review Letters 99, 178102 (2007) | 10.1103/PhysRevLett.99.178102 | null | cond-mat.soft cond-mat.stat-mech physics.flu-dyn | null | We present experimental results on the relaxation dynamics of vesicles
subjected to a time-dependent elongation flow. We observed and characterized a
new instability, which results in the formation of higher order modes of the
vesicle shape (wrinkles), after a switch in the direction of the gradient of
the velocity. This surprising generation of membrane wrinkles can be explained
by the appearance of a negative surface tension during the vesicle deflation,
due to compression in a sign-switching transient. Moreover, the formation of
buds in the vesicle membrane has been observed in the vicinity of the dynamical
transition point.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 14:13:19 GMT"
}
] | 2011-02-01T00:00:00 | [
[
"Kantsler",
"Vasiliy",
""
],
[
"Segre",
"Enrico",
""
],
[
"Steinberg",
"Victor",
""
]
] |
0704.3847 | Giulio Ciraolo | Giulio Ciraolo and Rolando Magnanini | Analytical results for 2-D non-rectilinear waveguides based on the
Green's function | 18 pages, 8 figures | null | 10.1002/mma.988 | null | math.AP math-ph math.MP | null | We consider the problem of wave propagation for a 2-D rectilinear optical
waveguide which presents some perturbation. We construct a mathematical
framework to study such a problem and prove the existence of a solution for the
case of small imperfections. Our results are based on the knowledge of a
Green's function for the rectilinear case.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 17:49:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ciraolo",
"Giulio",
""
],
[
"Magnanini",
"Rolando",
""
]
] |
0704.3848 | Dietrich Stauffer | D. Stauffer | Scaling Properties, Fractals, and the Renormalisation Group Approach to
Percolation | Review, 19 pages including all figures | null | null | null | cond-mat.dis-nn cond-mat.stat-mech | null | For Encyclopedia of Complexity and Systems Science (Springer Verlag). No
abstract.
I. Definition and Introduction
II. Methods
III. Quantities and Exponents
IV. Fractal Dimension; Incipient Infinite Cluster
V. Simple Renormalisation Group
VI. Future Directions
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 17:50:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Stauffer",
"D.",
""
]
] |
0704.3849 | Dietrich Stauffer | D. Stauffer | Phase Transitions on Fractals and Networks | Review, 16 pages including all figures | null | null | null | cond-mat.dis-nn cond-mat.stat-mech | null | For Encyclopedia of Complexist and System Science No abstract given
I. Definition and Introduction
II. Ising Model
III. Fractals
IV. Diffusion on Fractals
V. Ising Model on Fractals
VI. Other Subjects ?
VII. Networks
VIII. Future Directions
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 17:54:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Stauffer",
"D.",
""
]
] |
0704.3850 | Vladimir Bavula | V. V. Bavula | Derivations and skew derivations of the Grassmann algebras | 23 pages | null | null | null | math.RA math-ph math.MP | null | Surprisingly, skew derivations rather than ordinary derivations are more
basic (important) object in study of the Grassmann algebras. Let $\L_n =
K\lfloor x_1, ..., x_n\rfloor$ be the Grassmann algebra over a commutative ring
$K$ with ${1/2}\in K$, and $\d$ be a skew $K$-derivation of $\L_n$. It is
proved that $\d$ is a unique sum $\d = \d^{ev} +\d^{od}$ of an even and odd
skew derivation. Explicit formulae are given for $\d^{ev}$ and $\d^{od}$ via
the elements $\d (x_1), ..., \d (x_n)$. It is proved that the set of all even
skew derivations of $\L_n$ coincides with the set of all the inner skew
derivations. Similar results are proved for derivations of $\L_n$. In
particular, $\Der_K(\L_n)$ is a faithful but not simple $\Aut_K(\L_n)$-module
(where $K$ is reduced and $n\geq 2$). All differential and skew differential
ideals of $\L_n$ are found. It is proved that the set of generic normal
elements of $\L_n$ that are not units forms a single $\Aut_K(\L_n)$-orbit
(namely, $\Aut_K(\L_n)x_1$) if $n$ is even and two orbits (namely,
$\Aut_K(\L_n)x_1$ and $\Aut_K(\L_n)(x_1+x_2... x_n)$) if $n$ is odd.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 18:35:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bavula",
"V. V.",
""
]
] |
0704.3851 | Alexei Kritsuk | Alexei G. Kritsuk, Michael L. Norman, Paolo Padoan, and Rick Wagner | The Statistics of Supersonic Isothermal Turbulence | 15 pages, 19 figures, ApJ v665, n2, 2007 | Astrophys.J.665:416-431,2007 | 10.1086/519443 | null | astro-ph | null | We present results of large-scale three-dimensional simulations of supersonic
Euler turbulence with the piecewise parabolic method and multiple grid
resolutions up to 2048^3 points. Our numerical experiments describe
non-magnetized driven turbulent flows with an isothermal equation of state and
an rms Mach number of 6. We discuss numerical resolution issues and demonstrate
convergence, in a statistical sense, of the inertial range dynamics in
simulations on grids larger than 512^3 points. The simulations allowed us to
measure the absolute velocity scaling exponents for the first time. The
inertial range velocity scaling in this strongly compressible regime deviates
substantially from the incompressible Kolmogorov laws. The slope of the
velocity power spectrum, for instance, is -1.95 compared to -5/3 in the
incompressible case. The exponent of the third-order velocity structure
function is 1.28, while in incompressible turbulence it is known to be unity.
We propose a natural extension of Kolmogorov's phenomenology that takes into
account compressibility by mixing the velocity and density statistics and
preserves the Kolmogorov scaling of the power spectrum and structure functions
of the density-weighted velocity v=\rho^{1/3}u. The low-order statistics of v
appear to be invariant with respect to changes in the Mach number. For
instance, at Mach 6 the slope of the power spectrum of v is -1.69, and the
exponent of the third-order structure function of v is unity. We also directly
measure the mass dimension of the "fractal" density distribution in the
inertial subrange, D_m = 2.4, which is similar to the observed fractal
dimension of molecular clouds and agrees well with the cascade phenomenology.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:07:23 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 23:55:40 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kritsuk",
"Alexei G.",
""
],
[
"Norman",
"Michael L.",
""
],
[
"Padoan",
"Paolo",
""
],
[
"Wagner",
"Rick",
""
]
] |
0704.3852 | Jennifer Kreft | Jennifer Kreft, Matthias Schroeter, Jack B. Swift, Harry L. Swinney | Fluidization of a vertically oscillated shallow granular layer | After further investigations, we find that the results for the
temperature and rms displacement at low $\Gamma$ depend on the functional
form of the velocity dependence of the restitution coefficient | null | null | null | cond-mat.soft cond-mat.stat-mech | null | Molecular dynamics simulations are used to study fluidization of a vertically
vibrated, three-dimensional shallow granular layer. As the container
acceleration is increased above g, the granular temperature and root mean
square particle displacement increase, gradually fluidizing the layer. For
nearly elastic particles, or low shaking frequencies, or small layer depths,
the end of the fluidization process is marked by an abrupt increase in the
granular temperature and rms particle displacement. The layer is then fully
fluidized since macroscopic, fluid-like phenomena such as convection rolls and
surface waves are observed. Increasing the total dissipation (by either
decreasing the restitution coefficient or increasing the total number of
particles) decreases the increase in granular temperature and rms particle
displacement at fluidization, and shifts the increase to higher accelerations.
Increasing the frequency also decreases the magnitude of the jump, and shifts
the change to lower accelerations.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:14:28 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 10:45:42 GMT"
}
] | 2007-08-01T00:00:00 | [
[
"Kreft",
"Jennifer",
""
],
[
"Schroeter",
"Matthias",
""
],
[
"Swift",
"Jack B.",
""
],
[
"Swinney",
"Harry L.",
""
]
] |
0704.3853 | Laurent Cognet | Laurent Cognet (CPMOH), Fran\c{c}oise Coussen (PCS), Daniel Choquet
(PCS), Brahim Lounis (CPMOH) | Fluorescence microscopy of single autofluorescent proteins for cellular
biology | null | Comptes Rendus de l Acad\'emie des Sciences - Series IV - Physics
3 (15/08/2002) 645 | null | null | physics.optics physics.bio-ph | null | In this paper we review the applicability of autofluorescent proteins for
single-molecule imaging in biology. The photophysical characteristics of
several mutants of the Green Fluorescent Protein (GFP) and those of DsRed are
compared and critically discussed for their use in cellular biology. The
alternative use of two-photon excitation at the single-molecule level or
Fluorescence Correlation Spectroscopy is envisaged for the study of individual
autofluorescent proteins. Single-molecule experiments performed in live cells
using eGFP and preferably eYFP fusion proteins are reviewed. Finally, the first
use at the single-molecule level of citrine, a more photostable variant of the
eYFP is reported when fused to a receptor for neurotransmitter in live cells.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:34:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Coussen",
"Françoise",
"",
"PCS"
],
[
"Choquet",
"Daniel",
"",
"PCS"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3854 | Laurent Cognet | Laurent Cognet (CPMOH), Laurent Groc (PCS), Brahim Lounis (CPMOH),
Daniel Choquet (PCS) | Multiple Routes for Glutamate Receptor Trafficking: Surface Diffusion
and Membrane Traffic Cooperate to Bring Receptors to Synapses | null | Science's STKE (electronic resource) : signal transduction
knowledge environment 327 (21/03/2006) 13 | null | null | physics.optics physics.bio-ph | null | Trafficking of glutamate receptors into and out of synapses is critically
involved in the plasticity of excitatory synaptic transmission. Endocytosis and
exocytosis of receptors have initially been thought to account alone for this
trafficking. However, membrane proteins also traffic through surface lateral
diffusion in the plasma membrane. We describe developments in
electrophysiological and optical approaches that have allowed for the real time
measurement of glutamate receptor surface trafficking in live neurons. These
include (i) specific imaging of surface receptors using a pH sensitive
fluorescent protein, (ii) design of a photoactivable drug to inactivate locally
surface receptors and monitor electrophysiologically their recovery, and
(iii)application of single molecule fluorescence microscopy to directly track
the movement of individual surface receptors with nanometer resolution inside
and outside synapses. Altogether, these approaches have demonstrated that
glutamate receptors diffuse at high rates in the neuronal membrane and suggest
a key role for surface diffusion in the regulation of receptor numbers at
synapses.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:36:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Groc",
"Laurent",
"",
"PCS"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
],
[
"Choquet",
"Daniel",
"",
"PCS"
]
] |
0704.3855 | Laurent Cognet | Piet H M Lommerse, Gerhard A Blab, Laurent Cognet, Gregory S Harms, B
Ewa Snaar-Jagalska, Herman P Spaink, Thomas Schmidt | Single-molecule imaging of the H-ras membrane-anchor reveals domains in
the cytoplasmic leaflet of the cell membrane | null | Biophys J 86, 1 Pt 1 (01/2004) 609-16 | null | null | physics.optics physics.bio-ph | null | In the last decade evidence has accumulated that small domains of 50-700 nm
in diameter are located in the exoplasmic leaflet of the plasma membrane. Most
of these domains supposedly consist of specific sets of lipids and proteins,
and are believed to coordinate signal transduction cascades. Whether similar
domains are also present in the cytoplasmic leaflet of the plasma membrane is
unclear so far. To investigate the presence of cytoplasmic leaflet domains, the
H-Ras membrane-targeting sequence was fused to the C-terminus of the enhanced
yellow fluorescent protein. Using single-molecule fluorescence microscopy,
trajectories of individual molecules diffusing in the cytoplasmic leaflet of
the plasma membrane were recorded. From these trajectories, the diffusion of
individual membrane-anchored enhanced yellow fluorescent protein molecules was
studied in live cells on timescales from 5 to 200 ms. The results show that the
diffusion of 30-40% of the molecules is constrained in domains with a typical
size of 200 nm. Neither breakdown of actin nor cholesterol extraction changed
the domain characteristics significantly, indicating that the observed domains
may not be related to the membrane domains identified so far.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:37:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lommerse",
"Piet H M",
""
],
[
"Blab",
"Gerhard A",
""
],
[
"Cognet",
"Laurent",
""
],
[
"Harms",
"Gregory S",
""
],
[
"Snaar-Jagalska",
"B Ewa",
""
],
[
"Spaink",
"Herman P",
""
],
[
"Schmidt",
"Thomas",
""
]
] |
0704.3856 | Augustin Skopal | A. Skopal | On the effect of emission lines on the UBVR photometry | 8 pages, 6 figures, 2 tables, New Astron. in press | New Astron.12:597-604,2007 | 10.1016/j.newast.2007.04.003 | null | astro-ph | null | We investigate the effect on the U, B, V, Rc and Rj magnitudes of the removal
of emission lines from a spectrum. We determined "Dm" corrections from the
ratio of fluxes with and without emission lines, transmitted from the object
through the photometric filter. An exact and a simplified approach for
operative use were applied. The effect was demonstrated for classical symbiotic
stars, symbiotic novae and the classical nova V1974 Cyg. It was found that
about 20-30, 30-40, 10 and 26/20 percents of the observed flux in the U, B, V
and Rc/Rj filter, respectively, is radiated in the emission lines of the
investigated classical symbiotic stars. The largest effect was found for
symbiotic novae (RR Tel and V1016 Cyg) and the classical nova V1974 Cyg at 210
days (in average of 74, 79, 56 and 66/60 percents). Examples for practical
application are suggested.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:44:41 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Skopal",
"A.",
""
]
] |
0704.3857 | Laurent Cognet | St\'ephane Berciaud (CPMOH), Laurent Cognet (CPMOH), Gerhard A Blab
(CPMOH), Brahim Lounis (CPMOH) | Photothermal heterodyne imaging of individual nonfluorescent
nanoclusters and nanocrystals | null | Physical review letters 93, 25 (17/12/2004) 257402 | 10.1103/PhysRevLett.93.257402 | null | physics.optics cond-mat.other | null | We introduce a new, highly sensitive, and simple heterodyne optical method
for imaging individual nonfluorescent nanoclusters and nanocrystals. A 2 order
of magnitude improvement of the signal is achieved compared to previous
methods. This allows for the unprecedented detection of individual small
absorptive objects such as metallic clusters (of 67 atoms) or nonluminescent
semiconductor nanocrystals. The measured signals are in agreement with a
calculation based on the scattering field theory from a photothermal-induced
modulated index of refraction profile around the nanoparticle.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:44:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Berciaud",
"Stéphane",
"",
"CPMOH"
],
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Blab",
"Gerhard A",
"",
"CPMOH"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3858 | Laurent Cognet | Catherine Tardin (CPMOH), Laurent Cognet (CPMOH), C\'ecile Bats (PCS),
Brahim Lounis (CPMOH), Daniel Choquet (PCS) | Direct imaging of lateral movements of AMPA receptors inside synapses | null | EMBO J 22, 18 (15/09/2003) 4656-65 | 10.1093/emboj/cdg463 | null | physics.optics physics.bio-ph | null | Trafficking of AMPA receptors in and out of synapses is crucial for synaptic
plasticity. Previous studies have focused on the role of endo/exocytosis
processes or that of lateral diffusion of extra-synaptic receptors. We have now
directly imaged AMPAR movements inside and outside synapses of live neurons
using single-molecule fluorescence microscopy. Inside individual synapses, we
found immobile and mobile receptors, which display restricted diffusion.
Extra-synaptic receptors display free diffusion. Receptors could also exchange
between these membrane compartments through lateral diffusion. Glutamate
application increased both receptor mobility inside synapses and the fraction
of mobile receptors present in a juxtasynaptic region. Block of inhibitory
transmission to favor excitatory synaptic activity induced a transient increase
in the fraction of mobile receptors and a decrease in the proportion of
juxtasynaptic receptors. Altogether, our data show that rapid exchange of
receptors between a synaptic and extra-synaptic localization occurs through
regulation of receptor diffusion inside synapses.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 19:45:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tardin",
"Catherine",
"",
"CPMOH"
],
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Bats",
"Cécile",
"",
"PCS"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
],
[
"Choquet",
"Daniel",
"",
"PCS"
]
] |
0704.3859 | Gunnar M\"oller | Gunnar Moller, Nigel R. Cooper | Density waves and supersolidity in rapidly rotating atomic Fermi gases | 4 pages, 1 figure, uses feynmp.sty | Phys. Rev. Lett. 99, 190409 (2007) | 10.1103/PhysRevLett.99.190409 | null | cond-mat.mes-hall cond-mat.supr-con | null | We study theoretically the low-temperature phases of a two-component atomic
Fermi gas with attractive s-wave interactions under conditions of rapid
rotation. We find that, in the extreme quantum limit, when all particles occupy
the lowest Landau level, the normal state is unstable to the formation of
"charge" density wave (CDW) order. At lower rotation rates, when many Landau
levels are occupied, we show that the low-temperature phases can be
supersolids, involving both CDW and superconducting order.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 20:15:42 GMT"
}
] | 2007-11-17T00:00:00 | [
[
"Moller",
"Gunnar",
""
],
[
"Cooper",
"Nigel R.",
""
]
] |
0704.3860 | Yun-Su Kim | Yun-Su Kim | C_{0}-Hilbert Modules | 14 pages | null | null | null | math.OA math.GN | null | We provide the definition and fundamental properties of algebraic elements
with respect to an operator satisfying hypothesis (h). Furthermore, we analyze
Hilbert modules using C_0-operators relative to a bounded finitely connected
region Omega in the complex plane.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 20:21:55 GMT"
},
{
"version": "v2",
"created": "Tue, 1 May 2007 22:06:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kim",
"Yun-Su",
""
]
] |
0704.3861 | Jinbo Cao | J. Cao, J. L. Musfeldt, S. Mazumdar, N. Chernova, and M. S.
Whittingham | Pinned Low Energy Electronic Excitation in Metal Exchanged Vanadium
Oxide Nanoscrolls | 4 figures | null | 10.1021/nl071002l | null | cond-mat.mtrl-sci | null | We measured the optical properties of mixed valent vanadium oxide nanoscrolls
and their metal exchanged derivatives in order to investigate the charge
dynamics in these compounds. In contrast to the prediction of a metallic state
for the metal exchanged derivatives within a rigid band model, we find that the
injected charges in Mn$^{2+}$ exchanged vanadium oxide nanoscrolls are pinned.
A low-energy electronic excitation associated with the pinned carriers appears
in the far infrared and persists at low temperature, suggesting that the
nanoscrolls are weak metals in their bulk form, dominated by inhomogeneous
charge disproportionation and Madelung energy effects.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 20:29:14 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Cao",
"J.",
""
],
[
"Musfeldt",
"J. L.",
""
],
[
"Mazumdar",
"S.",
""
],
[
"Chernova",
"N.",
""
],
[
"Whittingham",
"M. S.",
""
]
] |
0704.3862 | Tshilidzi Marwala | Tshilidzi Marwala, Monica Lagazio and Thando Tettey | An Integrated Human-Computer System for Controlling Interstate Disputes | 29 pages, 6 figures, 2 tables | null | null | null | stat.AP | null | In this paper we develop a scientific approach to control inter-country
conflict. This system makes use of a neural network and a feedback control
approach. It was found that by controlling the four controllable inputs:
Democracy, Dependency, Allies and Capability simultaneously, all the predicted
dispute outcomes could be avoided. Furthermore, it was observed that
controlling a single input Dependency or Capability also avoids all the
predicted conflicts. When the influence of each input variable on conflict is
assessed, Dependency, Capability, and Democracy emerge as key variables that
influence conflict.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 21:06:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Marwala",
"Tshilidzi",
""
],
[
"Lagazio",
"Monica",
""
],
[
"Tettey",
"Thando",
""
]
] |
0704.3863 | Tetsufumi Tanamoto | Tetsufumi Tanamoto and Yoshifumi Nishi | Fano-Kondo effect through two-level system based on quantum dots | 5pages,6figures | Phys. Rev. B76, 155319 (2007) | 10.1103/PhysRevB.76.155319 | null | cond-mat.str-el cond-mat.dis-nn | null | We theoretically study the Fano-Kondo effect in a triple quantum dot (QD)
system where two QDs constitute a two-level system and the other QD works in a
detector with electrodes. We found that the Fano dip is clearly modulated by
strongly coupled QDs in a two-level system and a slow detector with no
interacting QD. This setup suggests a new method of reading out qubit states.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 22:08:48 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 02:58:15 GMT"
}
] | 2014-01-08T00:00:00 | [
[
"Tanamoto",
"Tetsufumi",
""
],
[
"Nishi",
"Yoshifumi",
""
]
] |
0704.3864 | Pasha Zusmanovich | Pasha Zusmanovich | A converse to the Second Whitehead Lemma | v5: added erratum | J. Lie Theory 18 (2008), 295-299; Erratum: 24 (2014), 1207-1208 | null | null | math.RA math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that finite-dimensional Lie algebras over a field of characteristic
zero such that the second cohomology group in every finite-dimensional module
vanishes, are, essentially, semisimple.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 23:42:04 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Aug 2008 00:26:25 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Jan 2012 17:37:47 GMT"
},
{
"version": "v4",
"created": "Sat, 11 Jan 2014 21:08:15 GMT"
},
{
"version": "v5",
"created": "Wed, 13 Aug 2014 12:05:41 GMT"
}
] | 2014-08-14T00:00:00 | [
[
"Zusmanovich",
"Pasha",
""
]
] |
0704.3865 | Yoshihiro Nishiyama | Yoshihiro Nishiyama (Okayama University) | Multicriticality of the (2+1)-dimensional gonihedric model: A
realization of the (d,m)=(3,2) Lifshitz point | null | Phys. Rev. E 75, (2007) 051116. | 10.1103/PhysRevE.75.051116 | null | cond-mat.stat-mech | null | Multicriticality of the gonihedric model in 2+1 dimensions is investigated
numerically. The gonihedric model is a fully frustrated Ising magnet with the
finely tuned plaquette-type (four-body and plaquette-diagonal) interactions,
which cancel out the domain-wall surface tension. Because the
quantum-mechanical fluctuation along the imaginary-time direction is simply
ferromagnetic, the criticality of the (2+1)-dimensional gonihedric model should
be an anisotropic one; that is, the respective critical indices of real-space
(\perp) and imaginary-time (\parallel) sectors do not coincide. Extending the
parameter space to control the domain-wall surface tension, we analyze the
criticality in terms of the crossover (multicritical) scaling theory. By means
of the numerical diagonalization for the clusters with N\le 28 spins, we
obtained the correlation-length critical indices
(\nu_\perp,\nu_\parallel)=(0.45(10),1.04(27)), and the crossover exponent
\phi=0.7(2). Our results are comparable to
(\nu_{\perp},\nu_{\parallel})=(0.482,1.230), and \phi=0.688 obtained by Diehl
and Shpot for the (d,m)=(3,2) Lifshitz point with the \epsilon-expansion method
up to O(\epsilon^2).
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 00:30:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nishiyama",
"Yoshihiro",
"",
"Okayama University"
]
] |
0704.3866 | Igor Rodnianski | Sergiu Klainerman and Igor Rodnianski | Sharp $L^1$ estimates for singular transport equations | null | null | null | null | math.AP math.CA | null | We provide $L^1$ estimates for a class of transport equations containing
singular integral operators. While our main application is for a specific
problem in General Relativity we believe that the phenomenon which our result
illustrates is of a more general interest.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 00:37:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Klainerman",
"Sergiu",
""
],
[
"Rodnianski",
"Igor",
""
]
] |
0704.3867 | Jie Liu | Jie Liu, Li-Bin Fu, Bin Liu, and Biao Wu | Role of Particle Interactions in the Feshbach Conversion of Fermion
Atoms to Bosonic Molecules | 5 pages, 4 figures | New J. Phys. 10 (2008) 123018 | 10.1088/1367-2630/10/12/123018 | null | cond-mat.mes-hall | null | We investigate the Feshbach conversion of fermion atomic pairs to condensed
boson molecules with a microscopic model that accounts the repulsive
interactions among all the particles involved. We find that the conversion
efficiency is enhanced by the interaction between boson molecules while
suppressed by the interactions between fermion atoms and between atom and
molecule. In certain cases, the combined effect of these interactions leads to
a ceiling of less than 100% on the conversion efficiency even in the adiabatic
limit. Our model predicts a non-monotonic dependence of the efficiency on mean
atomic density. Our theory agrees well with recent experiments on $^6$Li and
$^{40}$K.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 01:14:30 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 07:22:10 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Dec 2007 07:52:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liu",
"Jie",
""
],
[
"Fu",
"Li-Bin",
""
],
[
"Liu",
"Bin",
""
],
[
"Wu",
"Biao",
""
]
] |
0704.3868 | D.-W. Wang | Daw-Wei Wang | An effective many-body theory for strongly interacting polar molecules | Same as published version (11 pages, 2 figure) | New J. Phys. 10 (2008) 053005 | 10.1088/1367-2630/10/5/053005 | null | cond-mat.other cond-mat.supr-con | null | We derive a general effective many-body theory for bosonic polar molecules in
strong interaction regime, which cannot be correctly described by previous
theories within the first Born approximation. The effective Hamiltonian has
additional interaction terms, which surprisingly reduces the anisotropic
features of dipolar interaction near the shape resonance regime. In the 2D
system with dipole moment perpendicular to the plane, we find that the phonon
dispersion scales as $\sqrt{|\bfp|}$ in the low momentum ($\bfp$) limit,
showing the same low energy properties as a 2D charged Bose gas with Coulomb
($1/r$) interactions.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 02:01:38 GMT"
},
{
"version": "v2",
"created": "Sat, 6 Oct 2007 10:04:44 GMT"
},
{
"version": "v3",
"created": "Thu, 8 May 2008 05:32:02 GMT"
}
] | 2008-05-08T00:00:00 | [
[
"Wang",
"Daw-Wei",
""
]
] |
0704.3869 | Yoshiyuki Fukumoto | S. Takemura and Y. Fukumoto | Evaluation of Exchange Interactions of the Spin Doughnut Mo_{75}V_{20} | 4 pages, 6 figures | null | 10.1143/JPSJ.76.083709 | null | cond-mat.str-el | null | Magnetic properties of the spin doughnut Mo_{75}V_{20}, which is a frustrated
magnetic cluster with twenty spins, are studied by using the finite-temperature
Lanczos method. Our model Hamiltonian consists of one ten-spin ring and two
five-spin rings with nearest-neighbor antiferromagnetic couplings J and J". The
five-spin rings are coupled to the ten-spin ring by an antiferromagnetic
exchange interaction J' so as to form isosceles triangles of one J-bond and two
J'-bonds. Fitting the theoretical magnetic susceptibility with the experimental
one measured by Muller et al., the exchange parameters are estimated as J=388
K, J'=163 K and J"=81 K. The most interesting feature of this system is that
the two five-spin rings behave like two free-spins at low temperatures in
despite of J'>J". We also calculate temperature dependence of the specific
heat, and find three peaks at T sim J, J" and J'/100.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 02:57:50 GMT"
},
{
"version": "v2",
"created": "Tue, 1 May 2007 00:37:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takemura",
"S.",
""
],
[
"Fukumoto",
"Y.",
""
]
] |
0704.3870 | Kazue Kudo | Kazue Kudo and Katsuhiro Nakamura | Effects of an oscillating field on pattern formation in a ferromagnetic
thin film: Analysis of patterns traveling at a low velocity | 9 pages, 3 figures | Phys. Rev. E 76, 036201 (2007) | 10.1103/PhysRevE.76.036201 | null | cond-mat.other nlin.PS | null | Magnetic domain patterns under an oscillating field is studied theoretically
by using a simple Ising-like model. We propose two ways to investigate the
effects of the oscillating field. The first one leads to a model in which
rapidly oscillating terms are averaged out, and the model can explain the
existence of the maximum amplitude of the field for the appearance of patterns.
The second one leads to a model that includes the delay of the response to the
field, and the model suggests the existence of a traveling pattern which moves
very slowly compared with the time scale of the driving field.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 02:59:53 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 11:29:55 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Sep 2007 15:21:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kudo",
"Kazue",
""
],
[
"Nakamura",
"Katsuhiro",
""
]
] |
0704.3871 | Dong Xu | Jia-Lin Zhu and Dong Xu | Effective tuning of exciton polarization splitting in coupled quantum
dots | 4 pages, 2 figures, to appear in Appl. Phys. Lett | Appl. Phys. Lett. 90, 261119 (2007) | 10.1063/1.2753116 | null | cond-mat.mes-hall | null | The polarization splitting of the exciton ground state in two laterally
coupled quantum dots under an in-plane electric field is investigated and its
effective tuning is designed. It is found that there are significant Stark
effect and anticrossing in energy levels. Due to coupling between inter- and
intra-dot states, the absolute value of polarization splitting is significantly
reduced, and it could be tuned to zero by the electric field for proper
inter-dot separations. Our scheme is interesting for the research on the
quantum dots-based entangled-photon source.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 15:05:42 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 07:28:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhu",
"Jia-Lin",
""
],
[
"Xu",
"Dong",
""
]
] |
0704.3872 | Victor H. Moll | Victor H. Moll | The integrals in Gradshteyn and Rhyzik. Part 1: A family of logarithmic
integrals | 6 pages | Scientia, Series A: Mathematical Sciences, Vol. 14 (2007), 1-6 | null | null | math.CA | null | We present the evaluation of a family of logarithmic integrals. This provides
a unified proof of several formulas in the classical table of integrals by I.
S. Gradshteyn and I. M. Rhyzik.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 03:58:15 GMT"
},
{
"version": "v2",
"created": "Tue, 1 May 2007 17:26:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Moll",
"Victor H.",
""
]
] |
0704.3873 | Victor H. Moll | Victor H. Moll | The integrals in Gradshteyn and Rhyzik. Part 2: Elementary logarithmic
integrals | null | Scientia, Series A: Mathematical Sciences, Vol. 14 (2007), 7-15 | null | null | math.CA | null | We describe methods to evaluate elementary logarithmic integrals. The
integrand is the product of a rational function and a linear polynomial in ln
x.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 04:08:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Moll",
"Victor H.",
""
]
] |
0704.3874 | Takashi Hotta | Takashi Hotta | Enhanced Kondo Effect in an Electron System Dynamically Coupled with
Local Optical Phonon | 8 pages, 8 figures | J. Phys. Soc. Jpn. 76, 084702 (2007). | 10.1143/JPSJ.76.084702 | null | cond-mat.str-el | null | We discuss Kondo behavior of a conduction electron system coupled with local
optical phonon by analyzing the Anderson-Holstein model with the use of a
numerical renormalization group (NRG) method. There appear three typical
regions due to the balance between Coulomb interaction $U_{\rm ee}$ and
phonon-mediated attraction $U_{\rm ph}$. For $U_{\rm ee}>U_{\rm ph}$, we
observe the standard Kondo effect concerning spin degree of freedom. Since the
Coulomb interaction is effectively reduced as $U_{\rm ee}-U_{\rm ph}$, the
Kondo temperature $T_{\rm K}$ is increased when $U_{\rm ph}$ is increased. On
the other hand, for $U_{\rm ee}<U_{\rm ph}$, there occurs the Kondo effect
concerning charge degree of freedom, since vacant and double occupied states
play roles of pseudo-spins. Note that in this case, $T_{\rm K}$ is decreased
with the increase of $U_{\rm ph}$. Namely, $T_{\rm K}$ should be maximized for
$U_{\rm ee} \approx U_{\rm ph}$. Then, we analyze in detail the Kondo behavior
at $U_{\rm ee}=U_{\rm ph}$, which is found to be explained by the polaron
Anderson model with reduced hybridization of polaron and residual repulsive
interaction among polarons. By comparing the NRG results of the polaron
Anderson model with those of the original Anderson-Holstein model, we clarify
the Kondo behavior in the competing region of $U_{\rm ee} \approx U_{\rm ph}$.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 04:36:00 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Hotta",
"Takashi",
""
]
] |
0704.3875 | Melvin Leok | Anthony M. Bloch, Melvin Leok, Jerrold E. Marsden, Dmitry V. Zenkov | Controlled Lagrangians and Stabilization of Discrete Mechanical Systems
I | 9 pages, 7 figures | null | null | null | math.OC | null | Controlled Lagrangian and matching techniques are developed for the
stabilization of relative equilibria and equilibria of discrete mechanical
systems with symmetry as well as broken symmetry. Interesting new phenomena
arise in the controlled Lagrangian approach in the discrete context that are
not present in the continuous theory. In particular, to make the discrete
theory effective, one can make an appropriate selection of momentum levels or,
alternatively, introduce a new parameter into the controlled Lagrangian to
complete the kinetic matching procedure. Specifically, new terms in the
controlled shape equation that are necessary for potential matching in the
discrete setting are introduced. The theory is illustrated with the problem of
stabilization of the cart-pendulum system on an incline. The paper also
discusses digital and model predictive controllers.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 08:06:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bloch",
"Anthony M.",
""
],
[
"Leok",
"Melvin",
""
],
[
"Marsden",
"Jerrold E.",
""
],
[
"Zenkov",
"Dmitry V.",
""
]
] |
0704.3876 | Dmytro Savchuk | Ievgen Bondarenko, Rostislav Grigorchuk, Rostyslav Kravchenko, Yevgen
Muntyan, Volodymyr Nekrashevych, Dmytro Savchuk, Zoran Sunic | Groups generated by 3-state automata over a 2-letter alphabet, II | 26 pages, 31 figures | null | null | null | math.GR | null | Classification of groups generated by 3-state automata over a 2-letter
alphabet started in the first paper (see http://www.arxiv.org/abs/math/0612178)
is continued.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 04:59:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bondarenko",
"Ievgen",
""
],
[
"Grigorchuk",
"Rostislav",
""
],
[
"Kravchenko",
"Rostyslav",
""
],
[
"Muntyan",
"Yevgen",
""
],
[
"Nekrashevych",
"Volodymyr",
""
],
[
"Savchuk",
"Dmytro",
""
],
[
"Sunic",
"Zoran",
""
]
] |
0704.3877 | Peter Kazinski | P.O. Kazinski | Relativistic diffusion equation from stochastic quantization | 16 pp., 2 figures, RevTeX; minor textual changes, references added;
two formulas added | null | null | null | hep-th | null | The new scheme of stochastic quantization is proposed. This quantization
procedure is equivalent to the deformation of an algebra of observables in the
manner of deformation quantization with an imaginary deformation parameter (the
Planck constant). We apply this method to the models of nonrelativistic and
relativistic particles interacting with an electromagnetic field. In the first
case we establish the equivalence of such a quantization to the Fokker-Planck
equation with a special force. The application of the proposed quantization
procedure to the model of a relativistic particle results in a relativistic
generalization of the Fokker-Planck equation in the coordinate space, which in
the absence of the electromagnetic field reduces to the relativistic diffusion
(heat) equation. The stationary probability distribution functions for a
stochastically quantized particle diffusing under a barrier and a particle in
the potential of a harmonic oscillator are derived.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:31:19 GMT"
},
{
"version": "v2",
"created": "Sun, 20 May 2007 16:47:52 GMT"
},
{
"version": "v3",
"created": "Sun, 3 Jun 2007 19:02:01 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Kazinski",
"P. O.",
""
]
] |
0704.3878 | Farhad Meshkati | Farhad Meshkati, Andrea J. Goldsmith, H. Vincent Poor and Stuart C.
Schwartz | A Game-Theoretic Approach to Energy-Efficient Modulation in CDMA
Networks with Delay Constraints | Appeared in the Proceedings of the 2007 IEEE Radio and Wireless
Symposium, Long Beach, CA, January 9-11, 2007 | null | 10.1109/RWS.2007.351784 | null | cs.IT cs.GT math.IT | null | A game-theoretic framework is used to study the effect of constellation size
on the energy efficiency of wireless networks for M-QAM modulation. A
non-cooperative game is proposed in which each user seeks to choose its
transmit power (and possibly transmit symbol rate) as well as the constellation
size in order to maximize its own utility while satisfying its delay
quality-of-service (QoS) constraint. The utility function used here measures
the number of reliable bits transmitted per joule of energy consumed, and is
particularly suitable for energy-constrained networks. The best-response
strategies and Nash equilibrium solution for the proposed game are derived. It
is shown that in order to maximize its utility (in bits per joule), a user must
choose the lowest constellation size that can accommodate the user's delay
constraint. Using this framework, the tradeoffs among energy efficiency, delay,
throughput and constellation size are also studied and quantified. The effect
of trellis-coded modulation on energy efficiency is also discussed.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:33:05 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Meshkati",
"Farhad",
""
],
[
"Goldsmith",
"Andrea J.",
""
],
[
"Poor",
"H. Vincent",
""
],
[
"Schwartz",
"Stuart C.",
""
]
] |
0704.3879 | Thorsten Renk | Thorsten Renk | Prospects of medium tomography using hard processes inside a soft medium | Talk given at the Mini-Workshop "Strongly Coupled Quark-Gluon Plasma:
SPS, RHIC and LHC", Nagoya, Japan, 16-18 February 2007 | null | null | null | hep-ph | null | Hard processes leading to high transverse momentum hadron production are
calculable in perturbative Quantum Chromodynamics (pQCD) for proton-proton
collisions. In heavy-ion collisions, such processes occur as well, and due to a
separation of scales are calculable on the level of the production of high p_T
partons. These subsequently interact with the medium which originates from
semi-hard and soft processes in the same collision before they hadronize. The
presence of the medium thus modifies the momentum spectrum of outgoing partons
and thus hard hadrons. The idea of jet tomography is to study this modification
in order to learn about the medium density distribution. While this is a
compelling idea, its practical application encounters some difficulties. In
this paper, the capability of various observables to provide tomographic
information about the medium is discussed and compared.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:41:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Renk",
"Thorsten",
""
]
] |
0704.3880 | Farhad Meshkati | Farhad Meshkati, H. Vincent Poor, Stuart C. Schwartz and Radu V. Balan | Energy-Efficient Resource Allocation in Wireless Networks with
Quality-of-Service Constraints | Accpeted for publication in the IEEE Transactions on Communications | null | 10.1109/TCOMM.2009.11.050638 | null | cs.IT math.IT | null | A game-theoretic model is proposed to study the cross-layer problem of joint
power and rate control with quality of service (QoS) constraints in
multiple-access networks. In the proposed game, each user seeks to choose its
transmit power and rate in a distributed manner in order to maximize its own
utility while satisfying its QoS requirements. The user's QoS constraints are
specified in terms of the average source rate and an upper bound on the average
delay where the delay includes both transmission and queuing delays. The
utility function considered here measures energy efficiency and is particularly
suitable for wireless networks with energy constraints. The Nash equilibrium
solution for the proposed non-cooperative game is derived and a closed-form
expression for the utility achieved at equilibrium is obtained. It is shown
that the QoS requirements of a user translate into a "size" for the user which
is an indication of the amount of network resources consumed by the user. Using
this competitive multiuser framework, the tradeoffs among throughput, delay,
network capacity and energy efficiency are studied. In addition, analytical
expressions are given for users' delay profiles and the delay performance of
the users at Nash equilibrium is quantified.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:43:21 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Meshkati",
"Farhad",
""
],
[
"Poor",
"H. Vincent",
""
],
[
"Schwartz",
"Stuart C.",
""
],
[
"Balan",
"Radu V.",
""
]
] |
0704.3881 | Farhad Meshkati | Farhad Meshkati, Dongning Guo, H. Vincent Poor and Stuart C. Schwartz | A Unified Approach to Energy-Efficient Power Control in Large CDMA
Systems | Accepted for publication in the IEEE Transactions on Wireless
Communications | null | null | null | cs.IT math.IT | null | A unified approach to energy-efficient power control is proposed for
code-division multiple access (CDMA) networks. The approach is applicable to a
large family of multiuser receivers including the matched filter, the
decorrelator, the linear minimum mean-square error (MMSE) receiver, and the
(nonlinear) optimal detectors. It exploits the linear relationship that has
been shown to exist between the transmit power and the output
signal-to-interference-plus-noise ratio (SIR) in the large-system limit. It is
shown that, for this family of receivers, when users seek to selfishly maximize
their own energy efficiency, the Nash equilibrium is SIR-balanced. In addition,
a unified power control (UPC) algorithm for reaching the Nash equilibrium is
proposed. The algorithm adjusts the user's transmit powers by iteratively
computing the large-system multiuser efficiency, which is independent of
instantaneous spreading sequences. The convergence of the algorithm is proved
for the matched filter, the decorrelator, and the MMSE receiver, and is
demonstrated by means of simulation for an optimal detector. Moreover, the
performance of the algorithm in finite-size systems is studied and compared
with that of a conventional power control scheme, in which user powers depend
on the instantaneous spreading sequences.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:52:23 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Meshkati",
"Farhad",
""
],
[
"Guo",
"Dongning",
""
],
[
"Poor",
"H. Vincent",
""
],
[
"Schwartz",
"Stuart C.",
""
]
] |
0704.3882 | Alessandro Papa | Rossella Falcone, Roberto Fiore, Mario Gravina and Alessandro Papa | Screening masses in the SU(3) pure gauge theory and universality | 19 pages, 9 figures; version to appear on Nuclear Physics B (Section
3.1 revisited; a few comments, a table and a reference added; fit results
included in Fig. 8) | Nucl.Phys.B785:19-33,2007 | 10.1016/j.nuclphysb.2007.06.009 | null | hep-lat | null | We determine from Polyakov loop correlators the screening masses in the
deconfined phase of the (3+1)d SU(3) pure gauge theory at finite temperature
near the transition, for two different channels of angular momentum and parity.
Their ratio is compared with that of the massive excitations with the same
quantum numbers in the 3d 3-state Potts model in the broken phase near the
transition point at zero magnetic field. Moreover we study the inverse decay
length of the correlation between the real parts and between the imaginary
parts of the Polyakov loop and compare the results with expectations from
perturbation theory and mean-field Polyakov loop models.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:54:04 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Jun 2007 17:00:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Falcone",
"Rossella",
""
],
[
"Fiore",
"Roberto",
""
],
[
"Gravina",
"Mario",
""
],
[
"Papa",
"Alessandro",
""
]
] |
0704.3883 | Petro Lazorenko F. | P. F. Lazorenko, M. Mayor, M. Dominik, F. Pepe, D. Segransan and S.
Udry | High-precision astrometry on the VLT/FORS1 at time scales of few days | 11 pages, 9 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20077149 | null | astro-ph | null | We investigate the accuracy of astrometric measurements with the VLT/FORS1
camera and consider potential applications. The study is based on two-epoch
(2000 and 2002/2003) frame series of observations of a selected Galactic Bulge
sky region that were obtained with FORS1 during four consecutive nights each.
Reductions were carried out with a novel technique that eliminates atmospheric
image motion and does not require a distinction between targets and reference
objects. The positional astrometric precision was found to be limited only by
the accuracy of the determination of the star photocentre, which is typically
200-300 microarcsec per single measurement for bright unsaturated stars
B=18-19. Several statistical tests have shown that at time-scales of 1-4 nights
the residual noise in measured positions is essentially a white noise with no
systematic instrumental signature and no significant deviation from a Gaussian
distribution. Some evidence of a good astrometric quality of the VLT for frames
separated by two years has also been found. Our data show that the VLT with
FORS1/2 cameras can be effectively used for astrometric observations of
planetary microlensing events and other applications where a high accuracy is
required, that is expected to reach 30-40 microarcsec for a series of 50 frames
(one hours with R filter).
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 06:54:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lazorenko",
"P. F.",
""
],
[
"Mayor",
"M.",
""
],
[
"Dominik",
"M.",
""
],
[
"Pepe",
"F.",
""
],
[
"Segransan",
"D.",
""
],
[
"Udry",
"S.",
""
]
] |
0704.3884 | Hans Bruntt | H. Bruntt, D. Stello, J. C. Suarez, T. Arentoft, T. R. Bedding, M. Y.
Bouzid, Z. Csubry, T. H. Dall, Z. E. Dind, S. Frandsen, R. L. Gilliland, A.
P. Jacob, H. R. Jensen, Y. B. Kang, S.-L. Kim, L. L. Kiss, H. Kjeldsen, J.-R.
Koo, J.-A. Lee, C.-U. Lee, J. Nuspl, C. Sterken, R. Szabo | Multisite campaign on the open cluster M67. III. Delta Scuti pulsations
in the blue stragglers | 15 pages, 14 figs, one appendix. Part three in a series of papers
describing results from an extensive multi-site campaign on the open cluster
M67 | Mon.Not.Roy.Astron.Soc.378:1371-1384,2007 | 10.1111/j.1365-2966.2007.11865.x | null | astro-ph | null | We have made an asteroseismic analysis of the variable blue stragglers in the
open cluster M67. The data set consists of photometric time series from eight
sites using nine 0.6-2.1 meter telescopes with a time baseline of 43 days. In
two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41
and 26) detected in delta Scuti stars belonging to a stellar cluster, and EW
Cnc has the second highest number of frequencies detected in any delta Scuti
star. We have computed a grid of pulsation models that take the effects of
rotation into account. The distribution of observed and theoretical frequencies
show that in a wide frequency range a significant fraction of the radial and
non-radial low-degree modes are excited to detectable amplitudes. Despite the
large number of observed frequencies we cannot constrain the fundamental
parameters of the stars. To make progress we need to identify the degrees of
some of the modes either from multi-colour photometry or spectroscopy.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 07:16:53 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bruntt",
"H.",
""
],
[
"Stello",
"D.",
""
],
[
"Suarez",
"J. C.",
""
],
[
"Arentoft",
"T.",
""
],
[
"Bedding",
"T. R.",
""
],
[
"Bouzid",
"M. Y.",
""
],
[
"Csubry",
"Z.",
""
],
[
"Dall",
"T. H.",
""
],
[
"Dind",
"Z. E.",
""
],
[
"Frandsen",
"S.",
""
],
[
"Gilliland",
"R. L.",
""
],
[
"Jacob",
"A. P.",
""
],
[
"Jensen",
"H. R.",
""
],
[
"Kang",
"Y. B.",
""
],
[
"Kim",
"S. -L.",
""
],
[
"Kiss",
"L. L.",
""
],
[
"Kjeldsen",
"H.",
""
],
[
"Koo",
"J. -R.",
""
],
[
"Lee",
"J. -A.",
""
],
[
"Lee",
"C. -U.",
""
],
[
"Nuspl",
"J.",
""
],
[
"Sterken",
"C.",
""
],
[
"Szabo",
"R.",
""
]
] |
0704.3885 | Isamiddin Rakhimov Sattarovich | U. D. Bekbaev, I. S. Rakhimov | On Classification of Finite Dimensional Complex Filiform Leibniz
Algebras (Part 2) | null | null | null | null | math.RA math.AG | null | The paper is devoted to classification problem of finite dimensional complex
none Lie filiform Leibniz algebras. Actually, the observations show there are
two resources to get classification of filiform Leibniz algebras. The first of
them is naturally graded none Lie filiform Leibniz algebras and the another one
is naturally graded filiform Lie algebras. Using the first resource we get two
disjoint classes of filiform Leibniz algebras. The present paper deals with the
second of the above two classes, the first class has been considered in our
previous paper. The algebraic classification here means to specify the
representatives of the orbits, whereas the geometric classification is the
problem of finding generic structural constants in the sense of algebraic
geometry. Our main effort in this paper is the algebraic classification. We
suggest here an algebraic method based on invariants. Utilizing this method for
any given low dimensional case all filiform Leibniz algebras can be classified.
Moreover, the results can be used for geometric classification of orbits of
such algebras.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 07:06:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bekbaev",
"U. D.",
""
],
[
"Rakhimov",
"I. S.",
""
]
] |
0704.3886 | W Saba | Walid S. Saba | A Note on Ontology and Ordinary Language | 19 pages, 1 figure | null | null | null | cs.AI cs.CL | null | We argue for a compositional semantics grounded in a strongly typed ontology
that reflects our commonsense view of the world and the way we talk about it.
Assuming such a structure we show that the semantics of various natural
language phenomena may become nearly trivial.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 17:55:39 GMT"
},
{
"version": "v2",
"created": "Tue, 1 May 2007 13:43:32 GMT"
},
{
"version": "v3",
"created": "Wed, 2 May 2007 18:13:22 GMT"
},
{
"version": "v4",
"created": "Thu, 3 May 2007 08:34:47 GMT"
},
{
"version": "v5",
"created": "Fri, 4 May 2007 17:49:03 GMT"
},
{
"version": "v6",
"created": "Mon, 7 May 2007 16:04:50 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Saba",
"Walid S.",
""
]
] |
0704.3887 | Israfil Guseinov | I.I.Guseinov, B.A.Mamedov | On the accurate evaluation of overlap integrals over Slater type
orbitals using analytical and recurrence relations | 6 pages, 2 tables | null | 10.1515/zna-2007-0901 | null | physics.chem-ph physics.comp-ph | null | In this study, using the analytical and recurrence relations suggested by the
authors in previous works, the new efficient and reliable program procedure for
the overlap integrals over Slater type orbitals (STOs) is presented. The
proposed procedure guarantees a highly accurate evaluation of the overlap
integrals with arbitrary values of quantum numbers, screening constants and
internuclear distances. It is demonstrated that the computational accuracy of
the proposed procedure is not only dependent on the efficiency of formulas, as
has been discussed previously, but also on a number of other factors including
the used program language package and solvent properties. The numerical results
obtained using the algorithm described in the present work are in a complete
agreement with those obtained using the alternative evaluation procedure. We
notice that the program works without any restrictions and in all range of
integral parameters.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 07:07:09 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Guseinov",
"I. I.",
""
],
[
"Mamedov",
"B. A.",
""
]
] |
0704.3888 | Farook Rahaman | F.Rahaman, K.Maity, P.Ghosh and K.Gayen | Gravitational field of a higher dimensional global monopole in Lyra
geometry | 7 pages. Published in Bulletin of the Gauhati University Mathematics
Association 8, 82 (2004) | Bulletin of the Gauhati University Mathematics Association 8, 82
(2004) | null | null | gr-qc | null | We present a five dimensional global monopole within the framework of Lyra
geometry. Also the gravitational field of the monopole solution has been
considered.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 07:09:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Rahaman",
"F.",
""
],
[
"Maity",
"K.",
""
],
[
"Ghosh",
"P.",
""
],
[
"Gayen",
"K.",
""
]
] |
0704.3889 | Elisabeth Sch\"oll-Paschinger | Jean-Michel Caillol, Federica Lo Verso, Elisabeth Scholl-Paschinger,
Jean-Jacques Weis | Liquid-vapour transition of the long range Yukawa fluid | 30 pages, 5 figures | Molecular Physics 105, 1813 (2007) | 10.1080/00268970701420524 | null | cond-mat.stat-mech | null | Two liquid state theories, the self-consistent Ornstein-Zernike equation
(SCOZA) and the hierarchical reference theory (HRT) are shown, by comparison
with Monte Carlo simulations, to perform extremely well in predicting the
liquid-vapour coexistence of the hard core Yukawa (HCY) fluid when the
interaction is long range. The long range of the potential is treated in the
simulations using both an Ewald sum and hyperspherical boundary conditions. In
addition, we present an analytical optimised mean field theory which is exact
in the limit of an infinitely long range interaction. The work extends a
previous one by Caccamo et al [Phys. Rev. E,60, 5533 (1999)] for short range
interactions.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 07:38:09 GMT"
}
] | 2012-07-02T00:00:00 | [
[
"Caillol",
"Jean-Michel",
""
],
[
"Verso",
"Federica Lo",
""
],
[
"Scholl-Paschinger",
"Elisabeth",
""
],
[
"Weis",
"Jean-Jacques",
""
]
] |
0704.3890 | Valmir Barbosa | Rodolfo M. Pussente, Valmir C. Barbosa | An algorithm for clock synchronization with the gradient property in
sensor networks | null | Journal of Parallel and Distributed Computing 69 (2009), 261-265 | 10.1016/j.jpdc.2008.11.001 | null | cs.DC | null | We introduce a distributed algorithm for clock synchronization in sensor
networks. Our algorithm assumes that nodes in the network only know their
immediate neighborhoods and an upper bound on the network's diameter.
Clock-synchronization messages are only sent as part of the communication,
assumed reasonably frequent, that already takes place among nodes. The
algorithm has the gradient property of [2], achieving an O(1) worst-case skew
between the logical clocks of neighbors. As in the case of [3,8], the
algorithm's actions are such that no constant lower bound exists on the rate at
which logical clocks progress in time, and for this reason the lower bound of
[2,5] that forbids constant skew between neighbors does not apply.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 19:59:14 GMT"
}
] | 2009-02-05T00:00:00 | [
[
"Pussente",
"Rodolfo M.",
""
],
[
"Barbosa",
"Valmir C.",
""
]
] |
0704.3891 | Thomas Klose | T. Klose, T. McLoughlin, J. A. Minahan, K. Zarembo | World-sheet scattering in AdS_5 x S^5 at two loops | 26pages, 3 figures | JHEP0708:051,2007 | 10.1088/1126-6708/2007/08/051 | ITEP-TH-17/7, UUITP-07/07 | hep-th | null | We study the AdS_5 x S^5 sigma-model truncated to the near-flat-space limit
to two-loops in perturbation theory. In addition to extending previously known
one-loop results to the full SU(2|2)^2 S-matrix we calculate the two-loop
correction to the dispersion relation and then compute the complete two-loop
S-matrix. The result of the perturbative calculation can be compared with the
appropriate limit of the conjectured S-matrix for the full theory and complete
agreement is found.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 16:53:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Klose",
"T.",
""
],
[
"McLoughlin",
"T.",
""
],
[
"Minahan",
"J. A.",
""
],
[
"Zarembo",
"K.",
""
]
] |
0704.3892 | Charles M. Marcus | L. DiCarlo, Yiming Zhang, D. T. McClure, D. J. Reilly, C. M. Marcus,
L. N. Pfeiffer, K. W. West, M. P. Hanson, A. C. Gossard | Current Noise in Quantum Point Contacts | Proceedings of the 6th Rencontres du Vietnam, Hanoi (2006) | null | null | null | cond-mat.mes-hall | null | We present measurements of current noise in quantum point contacts as a
function of source-drain bias, gate voltage, and in-plane magnetic field. At
zero bias, Johnson noise provides a measure of the electron temperature. At
finite bias, shot noise at zero field exhibits an asymmetry related to the 0.7
structure in conductance. The asymmetry in noise evolves smoothly into the
symmetric signature of spin-resolved electron transmission at high field.
Comparison to a phenomenological model with density-dependent level splitting
yields quantitative agreement. Additionally, a device-specific contribution to
the finite-bias noise, particularly visible on conductance plateaus (where shot
noise vanishes), agrees quantitatively with a model of bias-dependent electron
heating.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 07:50:49 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"DiCarlo",
"L.",
""
],
[
"Zhang",
"Yiming",
""
],
[
"McClure",
"D. T.",
""
],
[
"Reilly",
"D. J.",
""
],
[
"Marcus",
"C. M.",
""
],
[
"Pfeiffer",
"L. N.",
""
],
[
"West",
"K. W.",
""
],
[
"Hanson",
"M. P.",
""
],
[
"Gossard",
"A. C.",
""
]
] |
0704.3893 | Itzhak Fouxon | I. Fouxon and P. Horvai | Single and two-particle motion of heavy particles in turbulence | 4 pages | null | null | null | nlin.CD | null | We study motion of small particles in turbulence when the particle relaxation
time falls in the range of inertial time-scales of the flow. Due to inertia,
particles drift relative to the fluid. We show that the drift velocity is close
to the Lagrangian velocity increments of turbulence at the particle relaxation
time. We demonstrate that the collective drift of two close particles makes
them see local velocity increments fluctuate fast and we introduce the
corresponding Langevin description for separation dynamics. This allows to
describe the behavior of the Lyapunov exponent and give the analogue of
Richardson's law for separation above viscous scale.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 08:31:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Fouxon",
"I.",
""
],
[
"Horvai",
"P.",
""
]
] |
0704.3894 | HongVan Le | Hong-Van Le, Martin Panak and Jiri Vanzura | Manifolds admitting stable forms | 19 pages | Comm. Math. Carolinae, vol 49, n1,(2008), 101-117 | null | null | math.DG | null | In this note we give a direct method to classify all stable forms on $\R^n$
as well as to determine their automorphism groups. We show that in dimension
6,7,8 stable forms coincide with non-degnerate forms.
We present necessary conditions and sufficient conditions for a manifold to
admit a stable form. We also discuss rich properties of the geometry of such
manifolds.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 08:40:24 GMT"
}
] | 2008-05-03T00:00:00 | [
[
"Le",
"Hong-Van",
""
],
[
"Panak",
"Martin",
""
],
[
"Vanzura",
"Jiri",
""
]
] |
0704.3895 | Wei Wang | W. Wang, M.J. Harris, R. Diehl, H. Halloin, B. Cordier, A.W. Strong,
K. Kretschmer, J. Knoedlseder, P. Jean, G.G. Lichti, J.P. Roques, S. Schanne,
A. von Kienlin, G. Weidenspointner, C. Wunderer | SPI observations of the diffuse 60Fe emission in the Galaxy | 10 pages, 7 figures, 2 tables, A&A in press | Astron.Astrophys.469:1005,2007 | 10.1051/0004-6361:20066982 | null | astro-ph nucl-ex nucl-th | null | Gamma-ray line emission from radioactive decay of 60Fe provides constraints
on nucleosynthesis in massive stars and supernovae. The spectrometer SPI on
board INTEGRAL has accumulated nearly three years of data on gamma-ray emission
from the Galactic plane. We have analyzed these data with suitable
instrumental-background models and sky distributions to produce high-resolution
spectra of Galactic emission. We detect the gamma-ray lines from 60Fe decay at
1173 and 1333 keV, obtaining an improvement over our earlier measurement of
both lines with now 4.9 sigma significance for the combination of the two
lines. The average flux per line is (4.4 \pm 0.9) \times 10^{-5} ph cm^{-2}
s^{-1} rad^{-1} for the inner Galaxy region. Deriving the Galactic 26Al
gamma-ray line flux with using the same set of observations and analysis
method, we determine the flux ratio of 60Fe/26Al gamma-rays as 0.148 \pm 0.06.
The current theoretical predictions are still consistent with our result.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 08:41:49 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Wang",
"W.",
""
],
[
"Harris",
"M. J.",
""
],
[
"Diehl",
"R.",
""
],
[
"Halloin",
"H.",
""
],
[
"Cordier",
"B.",
""
],
[
"Strong",
"A. W.",
""
],
[
"Kretschmer",
"K.",
""
],
[
"Knoedlseder",
"J.",
""
],
[
"Jean",
"P.",
""
],
[
"Lichti",
"G. G.",
""
],
[
"Roques",
"J. P.",
""
],
[
"Schanne",
"S.",
""
],
[
"von Kienlin",
"A.",
""
],
[
"Weidenspointner",
"G.",
""
],
[
"Wunderer",
"C.",
""
]
] |
0704.3896 | Anna-Zuzana Dubnickova | E. Bartos, S. Dubnicka, A.Z. Dubnickova and E.A. Kuraev | Sum rule for photon target | Revtex, 3 pages, 2 figures | Phys.Rev.D76:057901,2007 | 10.1103/PhysRevD.76.057901 | null | hep-ph | null | The amplitude of zero angle scattering of electron on photon in the 3-rd QED
order of fine structure constant with $\gamma^*\gamma$ intermediate state
converting into quark--antiquark is considered. Utilizing analytic properties
of elastic photon--photon scattering amplitude an explicit expression for
differential cross- section of quark--antiquark pair production at
electron-photon collision in peripheral kinematics is derived apparently.
Limiting case of small transferred momenta with an application of the
Weizs\"acker-Williams like relation gives the sum rule for photon target,
bringing into the relation the sum of ratios of the four power of the quark
charges to squared quark masses with integral over the total $\gamma\gamma \to
2 jets$ cross--section.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 09:25:58 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 13:57:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bartos",
"E.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Kuraev",
"E. A.",
""
]
] |
0704.3897 | James Orr | J.M.S. Orr, P.D. Buckle, M. Fearn, C.J. Storey, L. Buckle, T. Ashley | A Surface-Gated InSb Quantum Well Single Electron Transistor | null | null | 10.1088/1367-2630/9/8/261 | null | cond-mat.mes-hall | null | Single electron charging effects in a surface-gated InSb/AlInSb QW structure
are reported. This material, due to its large g-factor and light effective
mass, offers considerable advantages over more commonly used materials, such as
GaAs, for quantum information processing devices. However, differences in
material and device technology result in significant processing challenges.
Simple Coulomb blockade and quantised confinement models are considered to
explain the observation of conductance oscillations in these structures. The
charging energy is found to be comparable with the energy spectrum for single
particle states.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 08:46:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Orr",
"J. M. S.",
""
],
[
"Buckle",
"P. D.",
""
],
[
"Fearn",
"M.",
""
],
[
"Storey",
"C. J.",
""
],
[
"Buckle",
"L.",
""
],
[
"Ashley",
"T.",
""
]
] |
0704.3898 | Gamal Nashed G.L. | Gamal G.L. Nashed and Takeshi Shirafuji | Reissner-Nordstr\"om Spacetime in the Tetrad Theory of Gravitation | 16 pages, Latex | Int.J.Mod.Phys.D16:65,2007 | 10.1142/S0218271807009310 | null | gr-qc | null | We give two classes of spherically symmetric exact solutions of the couple
gravitational and electromagnetic fields with charged source in the tetrad
theory of gravitation. The first solution depends on an arbitrary function
$H({R},t)$. The second solution depends on a constant parameter $\eta$. These
solutions reproduce the same metric, i.e., the Reissner--Nordstr$\ddot{o}$m
metric. If the arbitrary function which characterizes the first solution and
the arbitrary constant of the second solution are set to be zero, then the two
exact solutions will coincide with each other. We then calculate the energy
content associated with these analytic solutions using the superpotential
method. In particular, we examine whether these solutions meet the condition
which M{\o}ller required for a consistent energy-momentum complex: Namely, we
check whether the total four-momentum of an isolated system behaves as a
four-vector under Lorentz transformations. It is then found that the arbitrary
function should decrease faster than $1/\sqrt{R}$ for $R\to \infty$. It is also
shown that the second exact solution meets the M{\o}ller's condition.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 08:57:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nashed",
"Gamal G. L.",
""
],
[
"Shirafuji",
"Takeshi",
""
]
] |
0704.3899 | HongVan Le | Hong-Van Le and Kaoru Ono | Parameterized Gromov-Witten invariants and topology of symplectomorphism
groups | 23 pages, final version | Advanced Studies in Pure Math., 52, (2008), 51-75. | null | null | math.SG | null | In this note we introduce parameterized Gromov-Witten invariants for
symplectic fiber bundles and study the topology of the symplectomorphism group.
We also give sample applications showing the non-triviality of certain homotopy
groups of some symplectomorphism groups.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 09:04:27 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Dec 2007 10:58:50 GMT"
}
] | 2008-09-26T00:00:00 | [
[
"Le",
"Hong-Van",
""
],
[
"Ono",
"Kaoru",
""
]
] |
0704.3900 | James M. De Buizer | James De Buizer (Gemini Observatory) | The infrared environments of masers associated with star formation | 8 pages, 2 figures, to appear in the proceedings of IAUS 242
"Astrophysical Masers and Their Environments", eds. J. Chapman & W. Baan. A
version with higher resolution is available at
http://www.ctio.noao.edu/~debuizer | null | 10.1017/S1743921307012641 | null | astro-ph | null | The near infrared (1-2um) and the thermal infrared (3-25um) trace many of the
environments in which masers are thought to reside, including shocks, outflows,
accretion disks, and the dense medium near protostars. After a number of recent
surveys it has been found that there is a higher detection rate of mid-IR
emission towards masers than cm radio continuum emission from UC HII regions,
and that the mid-IR emission is actually more closely cospatial to the maser
locations. A high percentage of water and methanol masers that are not
coincident with the UC HII regions in massive star forming regions are likely
to be tracing outflows and extremely young high mass stars before the onset of
the UC HII region phase. After a decade of groundwork supporting the hypothesis
that linarly distributed class II methanol masers may generally trace accretion
disks around young massive stars, compelling evidence is mounting that these
masers may generally be associated with outflows instead. Substantiation of
this claim comes from recent outflow surveys and high angular resolution mid-IR
imaging of the maser environments.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 09:09:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"De Buizer",
"James",
"",
"Gemini Observatory"
]
] |
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