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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.3630 | Artem G. Abanov | Deqiang Sun, Ar. Abanov, and V.L. Pokrovsky | Molecular production at a wide Feshbach resonance in Fermi-gas of cooled
atoms | 4 pages, no figures | null | 10.1209/0295-5075/83/16003 | null | cond-mat.other | null | The problem of molecular production from degenerate gas of fermions at a wide
Feshbach resonance, in a single-mode approximation, is reduced to the linear
Landau-Zener problem for operators. The strong interaction leads to significant
renormalization of the gap between adiabatic levels. In contrast to static
problem the close vicinity of exact resonance does not play substantial role.
Two main physical results of our theory is the high sensitivity of molecular
production to the initial value of magnetic field and generation of a large BCS
condensate distributed over a broad range of momenta in inverse process of the
molecule dissociation.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 21:28:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sun",
"Deqiang",
""
],
[
"Abanov",
"Ar.",
""
],
[
"Pokrovsky",
"V. L.",
""
]
] |
0707.3631 | Bart{\l}omiej Siudeja | Bart{\l}omiej Siudeja | Isoperimetric inequalities for eigenvalues of triangles | null | null | null | null | math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lower bounds estimates are proved for the first eigenvalue for the Dirichlet
Laplacian on arbitrary triangles using various symmetrization techniques. These
results can viewed as a generalization of P\'olya's isoperimetric bounds. It is
also shown that amongst triangles, the equilateral triangle minimizes the
spectral gap and (under additional assumption) the ratio of the first two
eigenvalues. This last result resembles the Payne-P\'olya-Weinberger conjecture
proved by Ashbaugh and Benguria.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 21:38:50 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 07:57:11 GMT"
}
] | 2008-07-17T00:00:00 | [
[
"Siudeja",
"Bartłomiej",
""
]
] |
0707.3632 | Paschalis Karageorgis | Paschalis Karageorgis and John G. Stalker | Sharp bounds on 2m/r for static spherical objects | We changed a footnote in which an earlier result of H\aa{}kan
Andr\'{e}asson was not described correctly | Class.Quant.Grav.25:195021,2008 | 10.1088/0264-9381/25/19/195021 | null | gr-qc | null | Sharp bounds are obtained, under a variety of assumptions on the eigenvalues
of the Einstein tensor, for the ratio of the Hawking mass to the areal radius
in static, spherically symmetric space-times.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:48:53 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 17:26:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Karageorgis",
"Paschalis",
""
],
[
"Stalker",
"John G.",
""
]
] |
0707.3633 | Jens Eisert | M. Cramer, S. Ospelkaus, C. Ospelkaus, K. Bongs, K. Sengstock, J.
Eisert | Do mixtures of bosonic and fermionic atoms adiabatically heat up in
optical lattices? | 5 pages, 3 figures | Phys. Rev. Lett. 100, 140409 (2008) | 10.1103/PhysRevLett.100.140409 | null | cond-mat.stat-mech quant-ph | null | Mixtures of bosonic and fermionic atoms in optical lattices provide a
promising arena to study strongly correlated systems. In experiments realizing
such mixtures in the quantum degenerate regime the temperature is a key
parameter. In this work, we investigate the intrinsic heating and cooling
effects due to an entropy-preserving raising of the optical lattice potential.
We analyze this process, identify the generic behavior valid for a wide range
of parameters, and discuss it quantitatively for the recent experiments with
87Rb and 40K atoms. In the absence of a lattice, we treat the bosons in the
Hartree-Fock-Bogoliubov-Popov-approximation, including the fermions in a
self-consistent mean field interaction. In the presence of the full
three-dimensional lattice, we use a strong coupling expansion. As a result of
the presence of the fermions, the temperature of the mixture after the lattice
ramp-up is always higher than for the pure bosonic case. This sheds light onto
a key point in the analysis of recent experiments.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:00:30 GMT"
}
] | 2008-05-16T00:00:00 | [
[
"Cramer",
"M.",
""
],
[
"Ospelkaus",
"S.",
""
],
[
"Ospelkaus",
"C.",
""
],
[
"Bongs",
"K.",
""
],
[
"Sengstock",
"K.",
""
],
[
"Eisert",
"J.",
""
]
] |
0707.3634 | David R. Law | David R. Law, Charles C. Steidel, Dawn K. Erb, James E. Larkin, Max
Pettini, Alice E. Shapley, Shelley A. Wright | Integral Field Spectroscopy of High-Redshift Star Forming Galaxies with
Laser Guided Adaptive Optics: Evidence for Dispersion-Dominated Kinematics | 19 pages, 10 figures (5 color); accepted for publication in ApJ.
Version with full-resolution figures is available at
http://www.astro.caltech.edu/~drlaw/Papers/OSIRIS_data1.pdf | null | 10.1086/521786 | null | astro-ph | null | We present early results from an ongoing study of the kinematic structure of
star-forming galaxies at redshift z ~ 2 - 3 using integral-field spectroscopy
of rest-frame optical nebular emission lines in combination with Keck laser
guide star adaptive optics (LGSAO). We show kinematic maps of 3 target galaxies
Q1623-BX453, Q0449-BX93, and DSF2237a-C2 located at redshifts z = 2.1820,
2.0067, and 3.3172 respectively, each of which is well-resolved with a PSF
measuring approximately 0.11 - 0.15 arcsec (~ 900 - 1200 pc at z ~ 2-3) after
cosmetic smoothing. Neither galaxy at z ~ 2 exhibits substantial kinematic
structure on scales >~ 30 km/s; both are instead consistent with largely
dispersion-dominated velocity fields with sigma ~ 80 km/s along any given line
of sight into the galaxy. In contrast, DSF2237a-C2 presents a well-resolved
gradient in velocity over a distance of ~ 4 kpc with peak-to-peak amplitude of
140 km/s. It is unlikely that DSF2237a-C2 represents a dynamically cold
rotating disk of ionized gas as the local velocity dispersion of the galaxy
(sigma = 79 km/s) is comparable to the observed shear. Using extant
multi-wavelength spectroscopy and photometry we relate these kinematic data to
physical properties such as stellar mass, gas fraction, star formation rate,
and outflow kinematics and consider the applicability of current galaxy
formation models.[Abridged]
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:00:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Law",
"David R.",
""
],
[
"Steidel",
"Charles C.",
""
],
[
"Erb",
"Dawn K.",
""
],
[
"Larkin",
"James E.",
""
],
[
"Pettini",
"Max",
""
],
[
"Shapley",
"Alice E.",
""
],
[
"Wright",
"Shelley A.",
""
]
] |
0707.3635 | David Eichler | David Eichler and Hadar Manis | A Model for Fast Rising, Slowly Decaying Subpulses in Gamma-Ray Bursts | Submitted to ApJL | null | 10.1086/522778 | null | astro-ph | null | Gamma ray bursts (GRB's) often feature subpulses that have a distinctively
asymmetric profile -- they rise quickly and decay much more slowly, while their
spectrum softens slightly with observer time. It is suggested that these
subpulses are caused by slow baryonic clouds embedded within a primary
$\gamma$-ray beam, which scatter the $\gamma$-radiation into our line of sight
as they accelerate. Good quantitative agreement is obtained with observed light
curves and spectral evolution. The kinetic energy that the baryonic component
of GRB jets receives from the primary $\gamma$-radiation is predicted to be
about equal to the amount of $\gamma$-radiation that is scattered, consistent
with observations of afterglow. Several other observational consequences are
briefly discussed. The possibility is raised that the time scale of short GRB
is established by radiative acceleration and/or baryon injection rather than
the time scale of the central engine.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:01:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Eichler",
"David",
""
],
[
"Manis",
"Hadar",
""
]
] |
0707.3636 | Roman Rafikov | Roman Rafikov (CITA) | Cooling of young stars growing by disk accretion | 14 pages, 6 figures, submitted to ApJ | null | 10.1086/588420 | null | astro-ph | null | In the initial formation stages young stars must acquire a significant
fraction of their mass by accretion from a circumstellar disk that forms in the
center of a collapsing protostellar cloud. Throughout this period mass
accretion rates through the disk can reach 10^{-6}-10^{-5} M_Sun/yr leading to
substantial energy release in the vicinity of stellar surface. We study the
impact of irradiation of the stellar surface produced by the hot inner disk on
properties of accreting fully convective low-mass stars, and also look at
objects such as young brown dwarfs and giant planets. At high accretion rates
irradiation raises the surface temperature of the equatorial region above the
photospheric temperature T_0 that a star would have in the absence of
accretion. The high-latitude (polar) parts of the stellar surface, where disk
irradiation is weak, preserve their temperature at the level of T_0. In
strongly irradiated regions an almost isothermal outer radiative zone forms on
top of the fully convective interior, leading to the suppression of the local
internal cooling flux derived from stellar contraction (similar suppression
occurs in irradiated ``hot Jupiters''). Properties of this radiative zone
likely determine the amount of thermal energy that gets advected into the
convective interior of the star. Total intrinsic luminosity integrated over the
whole stellar surface is reduced compared to the non-accreting case, by up to a
factor of several in some systems (young brown dwarfs, stars in quasar disks,
forming giants planets), potentially leading to the retardation of stellar
contraction. Stars and brown dwarfs irradiated by their disks tend to lose
energy predominantly through their cool polar regions while young giant planets
accreting through the disk cool through their whole surface.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:23:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rafikov",
"Roman",
"",
"CITA"
]
] |
0707.3637 | B. A. Bernevig | B. Andrei Bernevig and F. D. M. Haldane | Fractional Quantum Hall States and Jack Polynomials | 4 pages, 2 figures 2 new references added | Phys. Rev. Lett. 100, 246802 (2008) | 10.1103/PhysRevLett.100.246802 | null | cond-mat.mes-hall | null | We describe an occupation-number-like picture of Fractional Quantum Hall
(FQH) states in terms of polynomial wavefunctions characterized by a dominant
occupation-number configuration. The bosonic variants of single-component
abelian and non-abelian FQH states are modeled by Jacks (Jack symmetric
polynomials), characterized by dominant occupation-number configurations
satisfying a generalized Pauli principle. In a series of well-known Quantum
Hall states, including the Laughlin, Read-Moore, and Read-Rezayi, the Jack
polynomials naturally implement a ``squeezing rule'' that constrains allowed
configurations to be restricted to those obtained by squeezing the dominant
configuration. The Jacks describing uniform FQH states satisfy a highest-weight
condition, and a clustering condition which can be generalized to describe
quasiparticle states.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:14:34 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 19:26:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bernevig",
"B. Andrei",
""
],
[
"Haldane",
"F. D. M.",
""
]
] |
0707.3638 | Vita Hinze-Hoare | V. Hinze-Hoare | The Review and Analysis of Human Computer Interaction (HCI) Principles | null | null | null | null | cs.HC | null | The History of HCI is briefly reviewed together with three HCI models and
structure including CSCW, CSCL and CSCR. It is shown that a number of
authorities consider HCI to be a fragmented discipline with no agreed set of
unifying design principles. An analysis of usability criteria based upon
citation frequency of authors is performed in order to discover the eight most
recognised HCI principles.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:19:47 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Hinze-Hoare",
"V.",
""
]
] |
0707.3639 | Bradley Warren | Bradley E. Warren, Helmut Jerjen, and B\"arbel S. Koribalski | The Minimum Amount of Stars a Galaxy Will Form | 37 Pages, 7 Figures. Accepted for publication in AJ | Astron.J.134:1849-1862,2007 | 10.1086/521925 | null | astro-ph | null | We present an analysis of the atomic hydrogen and stellar properties of 38
late-type galaxies in the local Universe covering a wide range of HI
mass-to-light ratios (M_HI/L_B), stellar luminosities, and surface
brightnesses. From these data we have identified an upper envelope for the
M_HI/L_B as a function of galaxy luminosity. This implies an empirical relation
between the minimum amount of stars a galaxy will form and its initial baryonic
mass. While the stellar mass of a galaxy seems to be only loosely connected to
its baryonic mass, the latter quantity is strongly linked to the galaxy's
dynamical mass as it is observed in the baryonic Tully-Fisher relation. We find
that dwarf irregular galaxies with generally high M_HI/L_B-ratios follow the
same trend as defined by lower M_HI/L_B giant galaxies, but are underluminous
for their rotation velocity to follow the trend in a stellar mass Tully-Fisher
relation, suggesting that the baryonic mass of the dwarf galaxies is normal but
they have failed to produced a sufficient amount of stars. Finally, we present
a three dimensional equivalent to the morphology-density relation which shows
that high M_HI/L_B galaxies preferentially evolve and/or survive in low-density
environments. We conclude that an isolated galaxy with a shallow dark matter
potential can retain a large portion of its baryonic matter in the form of gas,
only producing a minimum quantity of stars necessary to maintain a stable gas
disk.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:19:54 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Warren",
"Bradley E.",
""
],
[
"Jerjen",
"Helmut",
""
],
[
"Koribalski",
"Bärbel S.",
""
]
] |
0707.3640 | Donald Yau | Donald Yau | Deformation bicomplex of module-algebras | To appear in Homology, Homotopy and Applications | Homology, Homotopy and Applications 10 (2008), 97-128. | null | null | math.AT math.KT math.RA | null | The deformation bicomplex of a module-algebra over a bialgebra is
constructed. It is then applied to study algebraic deformations in which both
the module structure and the algebra structure are deformed. The cases of
module-coalgebras, comodule-(co)algebras, and (co)module-bialgebras are also
considered.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:26:17 GMT"
}
] | 2008-12-07T00:00:00 | [
[
"Yau",
"Donald",
""
]
] |
0707.3641 | Wenshan Cai | Wenshan Cai, Uday K. Chettiar, Alexander V. Kildishev, Graeme W.
Milton, and Vladimir M. Shalaev | Non-Magnetic Cloak without Reflection | 8 pages, 3 figures | null | null | null | physics.optics | null | In an electromagnetic cloak based on a transformation approach, reduced sets
of material properties are generally favored due to their easier implementation
in reality, although a seemingly inevitable drawback of undesired reflection
exists in such cloaks. Here we suggest using high-order transformations to
create smooth moduli at the outer boundary of the cloak, therefore completely
eliminating the detrimental scattering within the limit of geometric optics. We
apply this scheme to a non-magnetic cylindrical cloak and demonstrate that the
scattered field is reduced substantially in a cloak with optimal quadratic
transformation as compared to its linear counterpart.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 20:42:17 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Cai",
"Wenshan",
""
],
[
"Chettiar",
"Uday K.",
""
],
[
"Kildishev",
"Alexander V.",
""
],
[
"Milton",
"Graeme W.",
""
],
[
"Shalaev",
"Vladimir M.",
""
]
] |
0707.3642 | Joshua E. S. Socolar | Andre S. Ribeiro, Stuart A. Kauffman, Jason Lloyd-Price, Bj\"orn
Samuelsson and Joshua E. S. Socolar | Mutual information in random Boolean models of regulatory networks | 11 pages, 6 figures; Minor revisions for clarity and figure format,
one reference added | null | 10.1103/PhysRevE.77.011901 | null | q-bio.OT q-bio.QM | null | The amount of mutual information contained in time series of two elements
gives a measure of how well their activities are coordinated. In a large,
complex network of interacting elements, such as a genetic regulatory network
within a cell, the average of the mutual information over all pairs <I> is a
global measure of how well the system can coordinate its internal dynamics. We
study this average pairwise mutual information in random Boolean networks
(RBNs) as a function of the distribution of Boolean rules implemented at each
element, assuming that the links in the network are randomly placed. Efficient
numerical methods for calculating <I> show that as the number of network nodes
N approaches infinity, the quantity N<I> exhibits a discontinuity at parameter
values corresponding to critical RBNs. For finite systems it peaks near the
critical value, but slightly in the disordered regime for typical parameter
variations. The source of high values of N<I> is the indirect correlations
between pairs of elements from different long chains with a common starting
point. The contribution from pairs that are directly linked approaches zero for
critical networks and peaks deep in the disordered regime.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 21:51:15 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 20:43:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ribeiro",
"Andre S.",
""
],
[
"Kauffman",
"Stuart A.",
""
],
[
"Lloyd-Price",
"Jason",
""
],
[
"Samuelsson",
"Björn",
""
],
[
"Socolar",
"Joshua E. S.",
""
]
] |
0707.3643 | Daniel Rogalski | D. Rogalski | GK-dimension of birationally commutative surfaces | 26 pages, minor corrections from previous version based on referee
report. To appear in Trans. Amer. Math. Soc | null | null | null | math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let k be an algebraically closed field, let K/k be a finitely generated field
extension of transcendence degree 2 with automorphism sigma, and let A be an
N-graded subalgebra of Q = K[t; sigma] with A_n finite dimensional over k for
all n. Then if A is big enough in Q in an appropriate sense, we prove that
GKdim A = 3,4,5 or is infinite, with the exact value depending only on the
geometric properties of sigma. The proof uses techniques in the birational
geometry of surfaces which are of independent interest.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 22:05:46 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 01:10:24 GMT"
}
] | 2008-07-23T00:00:00 | [
[
"Rogalski",
"D.",
""
]
] |
0707.3644 | Athanasios Chantis Dr. | Athanasios N. Chantis, Kirill D. Belashchenko, Darryl L. Smith, Evgeny
Y. Tsymbal, Mark van Schilfgaarde, Robert C. Albers | Reversal of spin polarization in Fe/GaAs (001) driven by resonant
surface states: First-principles calculations | null | Phys. Rev. Lett. 99, 196603 (2007) | 10.1103/PhysRevLett.99.196603 | null | cond-mat.mtrl-sci | null | A minority-spin resonant state at the Fe/GaAs(001) interface is predicted to
reverse the spin polarization with voltage bias of electrons transmitted across
this interface. Using a Green's function approach within the local spin density
approximation we calculate spin-dependent current in a Fe/GaAs/Cu tunnel
junction as a function of applied bias voltage. We find a change in sign of the
spin polarization of tunneling electrons with bias voltage due to the interface
minority-spin resonance. This result explains recent experimental data on spin
injection in Fe/GaAs contacts and on tunneling magnetoresistance in Fe/GaAs/Fe
magnetic tunnel junctions.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 22:13:44 GMT"
}
] | 2007-11-10T00:00:00 | [
[
"Chantis",
"Athanasios N.",
""
],
[
"Belashchenko",
"Kirill D.",
""
],
[
"Smith",
"Darryl L.",
""
],
[
"Tsymbal",
"Evgeny Y.",
""
],
[
"van Schilfgaarde",
"Mark",
""
],
[
"Albers",
"Robert C.",
""
]
] |
0707.3645 | Chi-Thiem Hoang | Thiem Hoang, Alex Lazarian | Radiative torque alignment: Essential Physical Processes | 31 pages. MNRAS 2007, in press, typos are corrected; | Mon.Not.Roy.Astron.Soc.388:117,2008 | 10.1111/j.1365-2966.2008.13249.x | null | astro-ph | null | We study the physical processes that affect the alignment of grains subject
to radiative torques (RATs). To describe the action of RATs, we use the
analytical model (AMO) of RATs introduced in Paper I. We focus our discussion
on the alignment by anisotropic radiation flux with respect to magnetic field,
which defines the axis of grain Larmor precession. Such an alignment does not
invoke paramagnetic dissipation (i.e. Davis-Greenstein mechanism), but,
nevertheless, grains tend to be aligned with long axes perpendicular to the
magnetic field. When we account for thermal fluctuations within grain material,
we show that for grains, which are characterized by a triaxial ellipsoid of
inertia, the zero-$J$ attractor point obtained in our earlier study develops
into a low-$J$ attractor point. We study effects of stochastic gaseous
bombardment and show that gaseous bombardment can drive grains from low-$J$ to
high-$J$ attractor points in cases when the high-$J$ attractor points are
present. As the alignment of grain axes with respect to angular momentum is
higher for higher values of $J$, counter-intuitively, gaseous bombardment can
increase the degree of grain alignment in respect to the magnetic field. We
also study the effects of torques induced by H$_2$ formation and show that they
can change the value of angular momentum at high-$J$ attractor point, but
marginally affect the value of angular momentum at low-$J$ attractor points. We
compare the AMO results with those obtained using the direct numerical
calculations of RATs acting upon irregular grains and validate the use of the
AMO for realistic situations of RAT alignment.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 23:03:17 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 22:42:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hoang",
"Thiem",
""
],
[
"Lazarian",
"Alex",
""
]
] |
0707.3646 | Dietrich Leibfried | D. Leibfried, E. Knill, C. Ospelkaus and D. J. Wineland | Transport quantum logic gates for trapped ions | 31 pages, 5 figures, minor improvements in figures and notation,
submitted to PRA | Phys. Rev. A 76, 032324 (2007) | 10.1103/PhysRevA.76.032324 | null | quant-ph | null | Many efforts are currently underway to build a device capable of large scale
quantum information processing (QIP). Whereas QIP has been demonstrated for a
few qubits in several systems, many technical difficulties must be overcome in
order to construct a large-scale device. In one proposal for large-scale QIP,
trapped ions are manipulated by precisely controlled light pulses and moved
through and stored in multizone trap arrays. The technical overhead necessary
to precisely control both the ion geometrical configurations and the laser
interactions is demanding. Here we propose methods that significantly reduce
the overhead on laser beam control for performing single and multiple qubit
operations on trapped ions. We show how a universal set of operations can be
implemented by controlled transport of ions through stationary laser beams. At
the same time, each laser beam can be used to perform many operations in
parallel, potentially reducing the total laser power necessary to carry out QIP
tasks. The overall setup necessary for implementing transport gates is simpler
than for gates executed on stationary ions. We also suggest a transport-based
two-qubit gate scheme utilizing microfabricated permanent magnets that can be
executed without laser light.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 23:19:13 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Aug 2007 18:06:07 GMT"
}
] | 2007-09-27T00:00:00 | [
[
"Leibfried",
"D.",
""
],
[
"Knill",
"E.",
""
],
[
"Ospelkaus",
"C.",
""
],
[
"Wineland",
"D. J.",
""
]
] |
0707.3647 | Huey-Wen Lin | Huey-Wen Lin | |V_{us}| from Lattice QCD | Talk given at 7th Particle Physics & Phenomenology Workshop. 15
pages, 6 figures | null | null | null | hep-ph hep-lat | null | I review recent progress in calculating |V_{us}| from lattice QCD kaon and
hyperon systems. A preliminary result from the first dynamical calculation in
the hyperon channel is included.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 23:27:34 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Lin",
"Huey-Wen",
""
]
] |
0707.3648 | Yu Gao | V. Barger, Y. Gao, Wai-Yee Keung | T-Anomaly Induced LHC Signals | 17 pages, 7 figures, 2 tables; Label in Fig.1 corrected, references
added; Graphic quality of figures improved | Phys.Lett.B655:228-235,2007 | 10.1016/j.physletb.2007.08.090 | null | hep-ph | null | $\cal T$-parity in the Little Higgs model could be violated by anomalies that
allow the lightest $\cal T$-odd $A_H$ to decay into $ZZ$ and $W^+W^-$. We
analyze these anomaly induced decays and the two-particle and the
three-particle decay modes of other heavy quarks and bosons in this model which
yield unique Large Hadron Collider (LHC) signals with fully reconstructable
events. $\cal T$-odd quarks in the Little Higgs model are nearly degenerate in
mass and they decay by almost identical processes; however, members of the
heavy Higgs triplet follow distinct decay modes. The branching fractions of
three-body decays increase with the global symmetry-breaking energy scale $f$
and are found to be at the level of a few percent in heavy quark decays while
they can reach up to 10% for heavy bosons.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 23:30:07 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 01:36:40 GMT"
},
{
"version": "v3",
"created": "Thu, 23 Aug 2007 17:32:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barger",
"V.",
""
],
[
"Gao",
"Y.",
""
],
[
"Keung",
"Wai-Yee",
""
]
] |
0707.3649 | Derek Homeier | Derek Homeier, Nicole F. Allard, France Allard | Alkali Line Profiles in Degenerate Dwarfs | VI Serbian Conference on Spectral Line Shapes in Astrophysics; to be
published by the American Institute of Physics, eds. Milan S. Dimitrijevic
and Luka C. Popovic; 6 pages, 6 figures | AIP Conf.Proc.938:170-175,2007 | 10.1063/1.2800123 | null | astro-ph | null | Ultracool stellar atmospheres show absorption by alkali resonance lines
severely broadened by collisions with neutral perturbers. In the coolest and
densest atmospheres, such as those of T dwarfs, Na I and K I broadened by
molecular hydrogen and helium can come to dominate the entire optical spectrum.
Their profiles have been successfully modelled with accurate interaction
potentials in the adiabatic theory, computing line profiles from the first few
orders of a density expansion of the autocorrelation function. The line shapes
in the emergent spectrum also depend on the distribution of absorbers as a
function of depth, which can be modelled with improved accuracy by new models
of dust condensation and settling.
The far red K I wings of the latest T dwarfs still show missing opacity in
these models, a phenomenon similar to what has been found for the Na I line
profiles observed in extremely cool, metal-rich white dwarfs. We show that the
line profile in both cases is strongly determined by multiple-perturber
interactions at short distances and can no longer be reproduced by a density
expansion, but requires calculation of the full profile in a unified theory.
Including such line profiles in stellar atmosphere codes will further improve
models for the coolest and densest dwarfs as well as for the deeper atmosphere
layers of substellar objects in general.
| [
{
"version": "v1",
"created": "Tue, 24 Jul 2007 23:45:21 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Homeier",
"Derek",
""
],
[
"Allard",
"Nicole F.",
""
],
[
"Allard",
"France",
""
]
] |
0707.3650 | HockSeng Goh | Hock-Seng Goh and Christopher A. Krenke | A Little Twin Higgs Model | 7 pages, no figures | Phys.Rev.D76:115018,2007 | 10.1103/PhysRevD.76.115018 | null | hep-ph | null | We present a twin Higgs model based on left-right symmetry with a tree level
quartic. This is made possible by extending the symmetry of the model to
include two Z_2 parities, each of which is sufficient to protect the Higgs from
getting a quadratically divergent mass squared. Although both parities are
broken explicitly, the symmetries that protect the Higgs from getting a
quadratically divergent mass are broken only collectively. The quadratic
divergences of the Higgs mass are thus still protected at one loop. We find
that the fine tuning in this model is reduced substantially compared to the
original left-right twin Higgs model. This mechanism can also be applied to the
mirror twin Higgs model to get a significant reduction of the fine tuning,
while keeping the mirror photon massless.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 00:19:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Goh",
"Hock-Seng",
""
],
[
"Krenke",
"Christopher A.",
""
]
] |
0707.3651 | Wang-Kong Tse | Wang-Kong Tse, S. Das Sarma | Phonon-induced many-body renormalization of graphene electronic
properties | Minor typo in the vertical-axis label of Fig. 1 corrected; accepted
version in PRL (in press) | Phys. Rev. Lett. 99, 236802 (2007) | 10.1103/PhysRevLett.99.236802 | null | cond-mat.mtrl-sci | null | We develop a theory for the electron-phonon interaction effects on the
electronic properties of graphene. We analytically calculate the electron
self-energy, spectral function and band velocity renormalization due to
phonon-mediated electron-electron interaction. We find that phonon-mediated
electron-electron coupling has a large effect on the graphene band structure
renormalization, and our analytic theory successfully captures the essential
features of the observed graphene electron spectra in the ARPES experiments,
predicting a kink at $\sim 200\mathrm{meV}$ below the Fermi level and a
reduction of the band velocity by $\sim 10-20%$ at the experimental doping
level.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 00:09:42 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 23:05:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tse",
"Wang-Kong",
""
],
[
"Sarma",
"S. Das",
""
]
] |
0707.3652 | Peter Zeiler Skands | Walter T. Giele, David A. Kosower, Peter Z. Skands | A simple shower and matching algorithm | 32 pages, 6 figures | Phys.Rev.D78:014026,2008 | 10.1103/PhysRevD.78.014026 | FERMILAB-PUB-07-160-T, Saclay/SPhT-T07/107 | hep-ph | null | We present a simple formalism for parton-shower Markov chains. As a first
step towards more complete uncertainty bands, we incorporate a comprehensive
exploration of the ambiguities inherent in such calculations. To reduce this
uncertainty, we then introduce a matching formalism which allows a generated
event sample to simultaneously reproduce any infrared safe distribution
calculated at leading or next-to-leading order in perturbation theory, up to
sub-leading corrections. To enable a more universal definition of perturbative
calculations, we also propose a more general definition of the hadronization
cutoff. Finally, we present an implementation of some of these ideas for
final-state gluon showers, in a code dubbed VINCIA.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 00:31:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giele",
"Walter T.",
""
],
[
"Kosower",
"David A.",
""
],
[
"Skands",
"Peter Z.",
""
]
] |
0707.3653 | Hitoshi Nishino | Roy Montalvo, Hitoshi Nishino and Subhash Rajpoot | Self-Dual Yang-Mills Multiplet in Three Dimensions Coupled to
Supergravity | 16 pages, no fugures | Phys.Rev.D75:125016,2007 | 10.1103/PhysRevD.75.125016 | null | hep-th | null | We couple a recently-established N=1 globally supersymmetric self-dual
Yang-Mills multiplet in three dimensions to supergravity. This becomes possible
due to our previous result on globally supersymmetric formulation based on a
compensator multiplet. We further couple the self-dual vector to a
supersymmetric sigma-model on the coset SO(8,n) / SO(8) X SO(n) via minimal
couplings for an arbitrary gauged subgroup H_0 \subset SO(8) X SO(n). A
corresponding superspace formulation is also presented.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 00:28:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Montalvo",
"Roy",
""
],
[
"Nishino",
"Hitoshi",
""
],
[
"Rajpoot",
"Subhash",
""
]
] |
0707.3654 | Scott A. Yost | M. Yu. Kalmykov (Baylor U. & Dubna, JINR & Hamburg U.,
Inst.Theor.Phys.II), B.F.L. Ward (Baylor U.), S.A. Yost (Baylor U. &
Princeton U.) | Multiple (inverse) binomial sums of arbitrary weight and depth and the
all-order epsilon-expansion of generalized hypergeometric functions with one
half-integer value of parameter | 24 pages, latex with amsmath and JHEP3.cls; v2: some typos corrected
and a few references added; v3: few references added; | JHEP 0710:048,2007 | 10.1088/1126-6708/2007/10/048 | BU-HEPP-07-01 | hep-th hep-ph math-ph math.CA math.MP | null | We continue the study of the construction of analytical coefficients of the
epsilon-expansion of hypergeometric functions and their connection with Feynman
diagrams. In this paper, we show the following results:
Theorem A: The multiple (inverse) binomial sums of arbitrary weight and depth
(see Eq. (1.1)) are expressible in terms of Remiddi-Vermaseren functions.
Theorem B: The epsilon expansion of a hypergeometric function with one
half-integer value of parameter (see Eq. (1.2)) is expressible in terms of the
harmonic polylogarithms of Remiddi and Vermaseren with coefficients that are
ratios of polynomials. Some extra materials are available via the www at this
http://theor.jinr.ru/~kalmykov/hypergeom/hyper.html
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 00:33:54 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 02:09:23 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Oct 2007 18:04:31 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Kalmykov",
"M. Yu.",
"",
"Baylor U. & Dubna, JINR & Hamburg U.,\n Inst.Theor.Phys.II"
],
[
"Ward",
"B. F. L.",
"",
"Baylor U."
],
[
"Yost",
"S. A.",
"",
"Baylor U. &\n Princeton U."
]
] |
0707.3655 | Bobby Ramsey Jr | C. Ogle | The Baum-Connes assembly map and the generalized Bass conjecture | 5 pages | null | null | null | math.KT | null | We show that the image of Connes-Karoubi-Chern character, restricted to the
image of the Baum-Connes assembly map in the Bott-periodized topological
K-theory of the complex group algebra, lies in the elliptic summand of the
(periodic) cyclic homology of the group algebra. This implies that for any
(weighted) ell-1 completion of the group algebra, rational surjectivity of the
Baum-Connes assembly map implies the generalized Bass conjecture for that
algebra.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 01:11:31 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Ogle",
"C.",
""
]
] |
0707.3656 | Gregory Snow | Gregory R. Snow (for the Pierre Auger Collaboration) | Education and Outreach for the Pierre Auger Observatory | 4 pages, 7 figures, submitted to the 2007 International Cosmic Ray
Conference (ICRC2007) in Merida, Mexico, July 2007 | null | null | null | astro-ph | null | The scale and scope of the physics studied at the Auger Observatory offer
significant opportunities for original outreach work. Education, outreach, and
public relations of the Auger collaboration are coordinated in a task of its
own whose goals are to encourage and support a wide range of efforts that link
schools and the public with the Auger scientists and the science of cosmic
rays, particle physics, and associated technologies. This report focuses on the
impact of the collaboration in Mendoza Province, Argentina, as: the Auger
Visitor Center in Malargue that has hosted over 29,000 visitors since 2001, the
Auger Celebration and a collaboration-sponsored science fair held on the
Observatory campus in November 2005, the opening of the James Cronin School in
Malargue in November 2006, public lectures, school visits, and courses for
science teachers. As the collaboration prepares the proposal for the northern
Auger site foreseen to be in southeast Colorado, plans for a comprehensive
outreach program are being developed in parallel, as described here.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 01:19:57 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Snow",
"Gregory R.",
"",
"for the Pierre Auger Collaboration"
]
] |
0707.3657 | Alexander Wissner-Gross | Alexander D. Wissner-Gross | Pattern Formation without Favored Local Interactions | 14 pages, 6 figures | null | null | null | nlin.CG | null | Individual cellular automata rules are attractive models for a range of
biological and physical self-assembling systems. While coexpression and
coevolution are common in such systems, ensembles of cellular automata rules
remain poorly understood. Here we report the first known analysis of the
equally weighted ensemble of all elementary cellular automata (ECA) rules.
Ensemble dynamics reveal persistent, localized, non-interacting patterns,
rather than homogenization. The patterns are strongly correlated by velocity
and have a quasi-linear dependence on initial conditions. Dispersion from a
single initial site generates peaks traveling at low-denominator fractional
velocities, some of which are not discernible in individual rules, suggesting
collective excitation. Further analysis of the time-evolved rule space shows
the 256 ECA rules can be represented by only approximately 111 principal
components. These results suggest the rather surprising conclusion that rich
self-assembly is possible without favoring particular local interactions.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 01:40:38 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Wissner-Gross",
"Alexander D.",
""
]
] |
0707.3658 | Bobby Ramsey Jr | R. Ji, C. Ogle, B. Ramsey | Relatively hyperbolic groups, rapid decay algebras, and a generalization
of the Bass conjecture | 32 pages, 2 figures; added an appendix also by C. Ogle | J. Noncommut. Geom. 4 (2010), 83-124 | 10.4171/JNCG/50 | null | math.KT | null | By deploying dense subalgebras of $\ell^1(G)$ we generalize the Bass
conjecture in terms of Connes' cyclic homology theory. In particular, we
propose a stronger version of the $\ell^1$-Bass Conjecture. We prove that
hyperbolic groups relative to finitely many subgroups, each of which posses the
polynomial conjugacy-bound property and nilpotent periodicity property, satisfy
the $\ell^1$-Stronger-Bass Conjecture. Moreover, we determine the
conjugacy-bound for relatively hyperbolic groups and compute the cyclic
cohomology of the $\ell^1$-algebra of any discrete group.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 01:43:34 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Sep 2007 17:26:51 GMT"
},
{
"version": "v3",
"created": "Mon, 19 Nov 2007 05:23:37 GMT"
}
] | 2011-10-05T00:00:00 | [
[
"Ji",
"R.",
""
],
[
"Ogle",
"C.",
""
],
[
"Ramsey",
"B.",
""
]
] |
0707.3659 | Gregory Snow | Daniel R. Claes, Gregory R. Snow | The Cosmic Ray Observatory Project: A Statewide Outreach and Education
Experiment in Nebraska | 4 pages, 4 figures, submitted to the 2007 International Cosmic Ray
Conference (ICRC2007), Merida, Mexico, July 2007 | null | null | null | astro-ph | null | The Cosmic Ray Observatory Project (CROP) is a statewide education and
research experiment involving Nebraska high school students, teachers and
university undergraduates in the study of extensive cosmic-ray air showers. A
network of high school teams construct, install, and operate school-based
detectors in coordination with University of Nebraska physics professors and
graduate students. The detector system at each school is an array of
scintillation counters recycled from the Chicago Air Shower Array in
weather-proof enclosures on the school roof, with a GPS receiver providing a
time stamp for cosmic-ray events. The detectors are connected to triggering
electronics and a data-acquisition PC inside the building. Students share data
via the Internet to search for time coincidences with other sites. Funded by
the National Science Foundation, CROP has enlisted 29 schools with the aim of
expanding to the 314 high schools in the state over several years. This report
highlights both the scientific and professional development achievements of the
project to date.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 01:44:20 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Claes",
"Daniel R.",
""
],
[
"Snow",
"Gregory R.",
""
]
] |
0707.3660 | Tian De Cao | Tian De Cao | Basic physics of solid materials | 5 pages, 3 figures; a new (recent) paper | null | null | null | cond-mat.supr-con | null | Since the cuprate materials behave many curious properties, the mechanism
that causes high-temperature superconductivity in copper oxide materials
(cuprates) has been a controversial topic. To explain these curious properties,
we must look out the physics what these materials include. In this letter, it
is presented that there are the basic physics (1)-(9) in solid materials. I
divide all solid materials into four categories, explain some properties of
them qualitatively, and suggest some ways to turn a solid material into a
superconductor. Particularly, this letter discusses the differences between the
p-type high-Tc cuprate superconductors, the n-type superconductor Nd2-xCexCuO4,
the BCS-superconductor similar MgB2, and heavy Fermions superconductors.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 02:59:40 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Oct 2007 23:26:37 GMT"
},
{
"version": "v3",
"created": "Sat, 10 Nov 2007 08:07:44 GMT"
}
] | 2007-11-10T00:00:00 | [
[
"De Cao",
"Tian",
""
]
] |
0707.3661 | Alfredo Aranda | Alfredo Aranda (Colima U.) | Neutrino mixing from the double tetrahedral group T^{\prime} | 4 pages, no figures. References added and minor typos corrected.
Version to appear in PRD | Phys.Rev.D76:111301,2007 | 10.1103/PhysRevD.76.111301 | DCP -07-01 | hep-ph | null | It is shown that it is possible to create successful models of flavor for
both quarks and leptons using the discrete non-abelian group $T^{\prime}$ by
itself. Two simple realizations are presented that can be used as the starting
point for more general scenarios. In addition to the Minimal Supersymmetric
Standard Model particle content, the models include three generations of right
handed neutrinos and four scalar flavon fields. Three of the flavons are needed
in the quark and charged lepton sector of the models and the fourth flavon
participates only in the neutrino sector.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 03:13:34 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 22:42:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aranda",
"Alfredo",
"",
"Colima U."
]
] |
0707.3662 | Alfredo Aranda | Alfredo Aranda, Omar Blanno and J. Lorenzo Diaz-Cruz | A Model of Neutrino and Higgs Physics at the Electroweak Scale | 11 pages, 4 figures, 1 table. Corrected factor on eq. 17 and data
table I. Added references. Version to appear in Physics Letters B | Phys.Lett.B660:62-66,2008 | 10.1016/j.physletb.2007.12.026 | DCP-07-02 | hep-ph | null | We present and explore the Higgs physics of a model that in addition to the
Standard Model fields includes a lepton number violating singlet scalar field.
Based on the fact that the only experimental data we have so far for physics
beyond the Standard Model is that of neutrino physics, we impose a constraint
for any addition not to introduce new higher scales. As such, we introduce
right-handed neutrinos with an Electroweak Scale mass. We study the Higgs decay
$H \to \nu \nu$ and show that it leads to different signatures compared to
those in the Standard Model, making it possible to detect them and to probe the
nature of their couplings.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 03:27:32 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Jan 2008 08:03:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aranda",
"Alfredo",
""
],
[
"Blanno",
"Omar",
""
],
[
"Diaz-Cruz",
"J. Lorenzo",
""
]
] |
0707.3663 | Victor H. Moll | Tewodros Amdeberhan and Victor H. Moll | The Laplace transform of the digamma function: an integral due to
Glasser, Manna and Oloa | 10 pages, 1 figure | null | null | null | math.CA | null | We provide an analytic expression for the Laplace transform of the digamma
fuction. This complements work of L. Glasser, D. Manna and O. Oloa on this
question. The Laplace transform is continuous in the Laplace-variable a. The
derivative admits a jump at a= ln 2.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 04:19:24 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Amdeberhan",
"Tewodros",
""
],
[
"Moll",
"Victor H.",
""
]
] |
0707.3664 | Simon Moulin | Simon Moulin (LMJL) | High frequency dispersive estimates in dimension two | 12 pages | null | null | null | math.AP | null | We prove dispersive estimates at high frequency in dimension two for both the
wave and the Schrodinger groupes for a very large class of real-valued
potentials.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 04:37:32 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Sep 2007 11:50:54 GMT"
}
] | 2007-09-13T00:00:00 | [
[
"Moulin",
"Simon",
"",
"LMJL"
]
] |
0707.3665 | Damien Chablat | Philippe Wenger (IRCCyN), Cl\'ement Gosselin (ROBOTICS Laboratory),
Damien Chablat (IRCCyN) | A Comparative Study of Parallel Kinematic Architectures for Machining
Applications | null | Dans 2nd Workshop on Computational Kinematics - WCK, S\'eoul :
Cor\'ee, R\'epublique de (05/2001) | null | null | cs.RO | null | Parallel kinematic mechanisms are interesting alternative designs for
machining applications. Three 2-DOF parallel mechanism architectures dedicated
to machining applications are studied in this paper. The three mechanisms have
two constant length struts gliding along fixed linear actuated joints with
different relative orientation. The comparative study is conducted on the basis
of a same prescribed Cartesian workspace for the three mechanisms. The common
desired workspace properties are a rectangular shape and given kinetostatic
performances. The machine size of each resulting design is used as a
comparative criterion. The 2-DOF machine mechanisms analyzed in this paper can
be extended to 3-axis machines by adding a third joint.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 04:40:01 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Wenger",
"Philippe",
"",
"IRCCyN"
],
[
"Gosselin",
"Clément",
"",
"ROBOTICS Laboratory"
],
[
"Chablat",
"Damien",
"",
"IRCCyN"
]
] |
0707.3666 | Damien Chablat | Philippe Wenger (IRCCyN), Damien Chablat (IRCCyN) | Kinematic Analysis of a New Parallel Machine Tool: the Orthoglide | null | Dans 7th International Symposium on Advances in Robot Kinematics -
ARK, France (2000) | null | null | cs.RO | null | This paper describes a new parallel kinematic architecture for machining
applications: the orthoglide. This machine features three fixed parallel linear
joints which are mounted orthogonally and a mobile platform which moves in the
Cartesian x-y-z space with fixed orientation. The main interest of the
orthoglide is that it takes benefit from the advantages of the popular PPP
serial machines (regular Cartesian workspace shape and uniform performances) as
well as from the parallel kinematic arrangement of the links (less inertia and
better dynamic performances), which makes the orthoglide well suited to
high-speed machining applications. Possible extension of the orthoglide to
5-axis machining is also investigated.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 04:42:19 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Wenger",
"Philippe",
"",
"IRCCyN"
],
[
"Chablat",
"Damien",
"",
"IRCCyN"
]
] |
0707.3667 | Taekyun Kim | Yilmaz Simsek | p-adic Dedekind and Hardy-Berndt type sum related to Volkenborn Integral
on Z_p | 4 pages | null | null | null | math.NT | null | The purpose of this paper is to construct p-adic Dedekind sums and
Hardy-Berndt type sums. We also construct generating function of the twisted
Bernoulli polynomials and functions. Furthermore, we give some discussions on
elliptic analogue of the Apostol-Dedekind sums.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 04:54:29 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Simsek",
"Yilmaz",
""
]
] |
0707.3668 | Ralph Sutherland | R. S. Sutherland, G. V. Bicknell | Interactions of a Light Hypersonic Jet with a Non-Uniform Interstellar
Medium | 66 pages, 22 figures, PDFLaTeX, aastex macros, graphicx and amssymb
packages, Accepted, to be published 2007 ApJS | null | 10.1086/520640 | null | astro-ph | null | We present three dimensional simulations of the interaction of a light
hypersonic jet with an inhomogeneous thermal and turbulently supported disk in
an elliptical galaxy. We model the jet as a light, supersonic non-relativistic
flow with parameters selected to be consistent with a relativistic jet with
kinetic power just above the FR1/FR2 break.
We identify four generic phases in the evolution of such a jet with the
inhomogeneous interstellar medium: 1) an initial ``flood and channel'' phase,
where progress is characterized by high pressure gas finding changing weak
points in the ISM, flowing through channels that form and re-form over time, 2)
a spherical, energy-driven bubble phase, were the bubble is larger than the
disk scale, but the jet remains fully disrupted close to the nucleus, 3) a
rapid, jet break--out phase the where jet breaks free of the last dense clouds,
becomes collimated and pierces the spherical bubble, and 4) a classical phase,
the jet propagates in a momentum-dominated fashion leading to the classical jet
+ cocoon + bow-shock structure.
Mass transport in the simulations is investigated, and we propose a model for
the morphology and component proper motions in the well-studied Compact
Symmetric Object 4C31.04.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 04:57:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sutherland",
"R. S.",
""
],
[
"Bicknell",
"G. V.",
""
]
] |
0707.3669 | Ralph Sutherland | R. S. Sutherland, G. V. Bicknell | Interaction of Jets with the ISM of Radio Galaxies | 22 pages, 10 figures, PDFLaTeX, aastex macros, graphicx package.
Proceedings of the 5th Stromlo Symposium: Disks, Winds, and Jets - from
Planets to Quasars. Accepted, to be published in Astronomy and Space Physics | Astrophys.Space Sci.311:293-303,2007 | 10.1007/s10509-007-9580-y | null | astro-ph | null | We present three dimensional simulations of the interaction of a light
hypersonic jet with an inhomogeneous thermal and turbulently supported disk in
an elliptical galaxy, including Radio and multi-band X-ray visualisations.
These simulations are applicable to the GPS/CSS phase of some extragalactic
radio sources.
We identify four generic phases in the evolution of such a jet with the
interstellar medium. The first is a `flood and channel'' phase, dominated by
complex jet interactions with the dense cloudy medium close to the nucleus. A
spherical, energy driven, bubble phase follows, where the bubble is larger than
the disk scale, but the jet remains fully disrupted close to the nucleus. Then
in a rapid, jet break--out phase, the jet breaks free of the last obstructing
dense clouds, becomes collimated and pierces the more or less spherical bubble.
In the final classical phase, the jet propagates in a momentum-dominated
fashion similar to jets in single component hot haloes, leading to the
classical jet -- cocoon -- bow-shock structure.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 05:29:56 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sutherland",
"R. S.",
""
],
[
"Bicknell",
"G. V.",
""
]
] |
0707.3670 | Xu Cheng | Xu Cheng and Cameron Dale and Jiangchuan Liu | Understanding the Characteristics of Internet Short Video Sharing:
YouTube as a Case Study | IEEE format, 9 pages, 16 figures | null | null | null | cs.NI cs.MM | null | Established in 2005, YouTube has become the most successful Internet site
providing a new generation of short video sharing service. Today, YouTube alone
comprises approximately 20% of all HTTP traffic, or nearly 10% of all traffic
on the Internet. Understanding the features of YouTube and similar video
sharing sites is thus crucial to their sustainable development and to network
traffic engineering. In this paper, using traces crawled in a 3-month period,
we present an in-depth and systematic measurement study on the characteristics
of YouTube videos. We find that YouTube videos have noticeably different
statistics compared to traditional streaming videos, ranging from length and
access pattern, to their active life span, ratings, and comments. The series of
datasets also allows us to identify the growth trend of this fast evolving
Internet site in various aspects, which has seldom been explored before. We
also look closely at the social networking aspect of YouTube, as this is a key
driving force toward its success. In particular, we find that the links to
related videos generated by uploaders' choices form a small-world network. This
suggests that the videos have strong correlations with each other, and creates
opportunities for developing novel caching or peer-to-peer distribution schemes
to efficiently deliver videos to end users.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 05:39:44 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Cheng",
"Xu",
""
],
[
"Dale",
"Cameron",
""
],
[
"Liu",
"Jiangchuan",
""
]
] |
0707.3671 | Natalia Kudryavtseva | N. N. Kudryavtseva, D. F. Avgustinovich, N. P. Bondar, M. V.
Tenditnik, I. L. Kovalenko, L. A. Koryakina | New method for the study of psychotropic drug effects under simulated
clinical conditions | 15 pages, 9 figures, 5 tables | null | null | null | q-bio.OT q-bio.QM | null | The sensory contact model allows forming different psychopathological states
(anxious depression, catalepsy, social withdrawal, pathological aggression,
hypersensitivity, cognition disturbances, anhedonia, alcoholism etc.) produced
by repeated agonistic interactions in male mice and investigating the
therapeutic and preventive properties of any drug as well as its efficiency
under simulated clinical conditions. This approach can be useful for a better
understanding of the drugs' action in different stages of disease development
in individuals. It is suggested that this pharmacological approach may be
applied for the screening of different novel psychotropic drugs.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 05:56:18 GMT"
},
{
"version": "v2",
"created": "Wed, 21 May 2008 10:03:51 GMT"
}
] | 2008-05-21T00:00:00 | [
[
"Kudryavtseva",
"N. N.",
""
],
[
"Avgustinovich",
"D. F.",
""
],
[
"Bondar",
"N. P.",
""
],
[
"Tenditnik",
"M. V.",
""
],
[
"Kovalenko",
"I. L.",
""
],
[
"Koryakina",
"L. A.",
""
]
] |
0707.3672 | Jean Mairesse | Jean Mairesse (INRIA Sophia Antipolis) | Products of irreducible random matrices in the (Max,+) Algebra | null | Advances in Applied Probability 29, 2 (1997) 444-477 | null | null | cs.OH | null | We consider the recursive equation ``x(n+1)=A(n)x(n)'' where x(n+1) and x(n)
are column vectors of size k and where A(n) is an irreducible random matrix of
size k x k. The matrix-vector multiplication in the (max,+) algebra is defined
by (A(n)x(n))_i= max_j [ A(n)_{ij} +x(n)_j ]. This type of equation can be used
to represent the evolution of Stochastic Event Graphs which include cyclic
Jackson Networks, some manufacturing models and models with general blocking
(such as Kanban). Let us assume that the sequence (A(n))_n is i.i.d or more
generally stationary and ergodic. The main result of the paper states that the
system couples in finite time with a unique stationary regime if and only if
there exists a set of matrices C such that P {A(0) in C} > 0, and the matrices
in C have a unique periodic regime.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 06:49:11 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Mairesse",
"Jean",
"",
"INRIA Sophia Antipolis"
]
] |
0707.3673 | Damien Chablat | Damien Chablat (IRCCyN), Jorge Angeles (CIM) | The Computation of All 4R Serial Spherical Wrists With an Isotropic
Architecture | null | Dans 2nd Workshop on Computational Kinematics - WCK, S\'eoul :
Cor\'ee, R\'epublique de (05/2001) | null | WCK-2001 | cs.RO | null | A spherical wrist of the serial type is said to be isotropic if it can attain
a posture whereby the singular values of its Jacobian matrix are all identical
and nonzero. What isotropy brings about is robustness to manufacturing,
assembly, and measurement errors, thereby guaranteeing a maximum orientation
accuracy. In this paper we investigate the existence of redundant isotropic
architectures, which should add to the dexterity of the wrist under design by
virtue of its extra degree of freedom. The problem formulation leads to a
system of eight quadratic equations with eight unknowns. The Bezout number of
this system is thus 2^8 = 256, its BKK bound being 192. However, the actual
number of solutions is shown to be 32. We list all solutions of the foregoing
algebraic problem. All these solutions are real, but distinct solutions do not
necessarily lead to distinct manipulators. Upon discarding those algebraic
solutions that yield no new wrists, we end up with exactly eight distinct
architectures, the eight corresponding manipulators being displayed at their
isotropic posture.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 06:51:53 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Angeles",
"Jorge",
"",
"CIM"
]
] |
0707.3674 | Dong Jik Kim | D. J. Kim, J. Y. Jo, T. H. Kim, S. M. Yang, B. Chen, Y. S. Kim, and T.
W. Noh | Observation of inhomogeneous domain nucleation in epitaxial Pb(Zr,Ti)O3
capacitors | null | null | 10.1063/1.2790485 | null | cond-mat.mtrl-sci | null | We investigated domain nucleation process in epitaxial Pb(Zr,Ti)O3 capacitors
under a modified piezoresponse force microscope. We obtained domain evolution
images during polarization switching process and observed that domain
nucleation occurs at particular sites. This inhomogeneous nucleation process
should play an important role in an early stage of switching and under a high
electric field. We found that the number of nuclei is linearly proportional to
log(switching time), suggesting a broad distribution of activation energies for
nucleation. The nucleation sites for a positive bias differ from those for a
negative bias, indicating that most nucleation sites are located at
ferroelectric/electrode interfaces.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 06:54:07 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Sep 2007 16:37:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"D. J.",
""
],
[
"Jo",
"J. Y.",
""
],
[
"Kim",
"T. H.",
""
],
[
"Yang",
"S. M.",
""
],
[
"Chen",
"B.",
""
],
[
"Kim",
"Y. S.",
""
],
[
"Noh",
"T. W.",
""
]
] |
0707.3675 | Ludvik Smrcka | L. Smrcka, N.A. Goncharuk, M. Orlita, R. Grill | Electronic structure of unidirectional superlattices in crossed electric
and magnetic fields and related terahertz oscillations | 7 pages, 1 figure, accepted for publication in Phys. Rev. B | Phys. Rev. B 76, 075321 (2007) | 10.1103/PhysRevB.76.075321 | null | cond-mat.mtrl-sci cond-mat.mes-hall | null | We have studied Bloch electrons in a perfect unidirectional superlattice
subject to crossed electric and magnetic fields, where the magnetic field is
oriented ``in-plane'', i.e. in parallel to the sample plane. Two orientation of
the electric field are considered. It is shown that the magnetic field
suppresses the intersubband tunneling of the Zener type, but does not change
the frequency of Bloch oscillations, if the electric field is oriented
perpendicularly to both the sample plane and the magnetic field. The electric
field applied in-plane (but perpendicularly to the magnetic field) yields the
step-like electron energy spectrum, corresponding to the magnetic-field-tunable
oscillations alternative to the Bloch ones.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 07:05:06 GMT"
}
] | 2011-05-05T00:00:00 | [
[
"Smrcka",
"L.",
""
],
[
"Goncharuk",
"N. A.",
""
],
[
"Orlita",
"M.",
""
],
[
"Grill",
"R.",
""
]
] |
0707.3676 | Rajeev K P | S. D. Tiwari (1), K. P. Rajeev (2) ((1) School of Physics and
Materials Science, Thapar University, India,(2) Department of Physics, Indian
Institute of Technology Kanpur, India) | Paramagnetic to Superparamagnetic Transition in Ni(OH)_2 Nanoparticles | 4 pages, 7 figures, a floating reference removed | null | null | null | cond-mat.mes-hall | null | We report the temperature and field dependence of dc magnetization on sol-gel
prepared nanoparticles of Ni(OH)_2. At higher temperature the system is found
to behave as a paramagnet while we find evidence for superparamagnetic blocking
at low temperature. The system shows a paramagnet-superparamagnet transition
and we discuss the underlying mechanism.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 13:21:00 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 10:17:16 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Tiwari",
"S. D.",
""
],
[
"Rajeev",
"K. P.",
""
]
] |
0707.3677 | Sanjay K. Ghosh | Abhijit Bhattacharyya, Sanjay K. Ghosh, Ritam Mallick and Sibaji Raha | General Relativistic effects on the conversion of nuclear to two-flavour
quark matter in compact stars | 4 pages, 4 figures | Phys.Rev.C76:052801,2007 | 10.1103/PhysRevC.76.052801 | null | astro-ph | null | We investigate the General Relativistic (GR) effects on the conversion from
nuclear to two-flavour quark matter in compact stars, both static as well as
rotating. We find that GR effects lead to qualitative differences in rotating
stars, indicating the inadequacy of non-relativistic (NR) or even Special
Relativistic (SR) treatments for these cases.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:44:19 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Bhattacharyya",
"Abhijit",
""
],
[
"Ghosh",
"Sanjay K.",
""
],
[
"Mallick",
"Ritam",
""
],
[
"Raha",
"Sibaji",
""
]
] |
0707.3678 | Louis H. Kauffman | Louis H. Kauffman and Samuel J. Lomonaco Jr | Spin Networks and Anyonic Topological Computing II | 13 pages, 14 figures, LaTeX document | In "Quantum Information and Computation V"', edited by Donkor,
Pirich and Brandt, pp. 64730U1-13, Volume 6573, Intl. Soc. Opt. Eng. (2007) | 10.1117/12.719476 | null | quant-ph | null | We review the q-deformed spin network approach to topological quantum field
theory and apply these methods to produce unitary representations of the braid
groups that are dense in the unitary groups. The simplest case of these models
is the Fibonacci model, itself universal for quantum computation. We here
formulate these braid group representations in a shape suitable for computation
and algebraic work.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 07:31:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kauffman",
"Louis H.",
""
],
[
"Lomonaco",
"Samuel J.",
"Jr"
]
] |
0707.3679 | C\'esar Domingo-Pardo | n_TOF Collaboration: C. Domingo-Pardo, et al | Measurement of the radiative neutron capture cross section of 206Pb and
its astrophysical implications | 11 pages, 8 figures, paper to be submitted to Phys. Rev. C | Phys.Rev.C76:045805,2007 | 10.1103/PhysRevC.76.045805 | null | nucl-ex | null | The (n, gamma) cross section of 206Pb has been measured at the CERN n_TOF
facility with high resolution in the energy range from 1 eV to 600 keV by using
two optimized C6D6 detectors. In the investigated energy interval about 130
resonances could be observed, from which 61 had enough statistics to be
reliably analyzed via the R-matrix analysis code SAMMY. Experimental
uncertainties were minimized, in particular with respect to (i) angular
distribution effects of the prompt capture gamma-rays, and to (ii) the
TOF-dependent background due to sample-scattered neutrons. Other background
components were addressed by background measurements with an enriched 208Pb
sample. The effect of the lower energy cutoff in the pulse height spectra of
the C6D6 detectors was carefully corrected via Monte Carlo simulations.
Compared to previous 206Pb values, the Maxwellian averaged capture cross
sections derived from these data are about 20% and 9% lower at thermal energies
of 5 keV and 30 keV, respectively. These new results have a direct impact on
the s-process abundance of 206Pb, which represents an important test for the
interpretation of the cosmic clock based on the decay of 238U.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 07:43:58 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 12:18:01 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"TOF Collaboration",
"",
""
],
[
"Domingo-Pardo",
"C.",
""
]
] |
0707.3680 | Matteo Merlo | Matteo Merlo, Federica Haupt, Fabio Cavaliere, Maura Sassetti | Sub-Poissonian phononic population in a nanoelectromechanical system | 4 pages, 3 figures | Revised version published in New J. Phys. 10 No 2, 023008 (2008) | 10.1088/1367-2630/10/2/023008 | null | cond-mat.mes-hall | null | Population of a phononic mode coupled to a single-electron transistor in the
sequential tunneling regime is discussed for the experimentally realistic case
of intermediate electron-phonon coupling. Features like a sub-Poissonian
bosonic distribution are found in regimes where electron transport drives the
oscillator strongly out of equilibrium with only few phonon states selectively
populated. The electron Fano factor is compared to fluctuations in the phonon
distribution, showing that all possible combinations of sub- and
super-Poissonian character can be realized.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 07:53:53 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 11:31:58 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Merlo",
"Matteo",
""
],
[
"Haupt",
"Federica",
""
],
[
"Cavaliere",
"Fabio",
""
],
[
"Sassetti",
"Maura",
""
]
] |
0707.3681 | Nicola Maggiore | Alberto Blasi and Nicola Maggiore | On Consistency Of Noncommutative Chern-Simons Theory | 17 pages | JHEP 0710:038,2007 | 10.1088/1126-6708/2007/10/038 | GEF-TH-20/2007 | hep-th | null | We consider the noncommutative extension of Chern-Simons theory. We show the
the theory can be fully expanded in power series of the noncommutative
parameter theta and that no non-analytical sector exists. The theory appears to
be unstable under radiative corrections, but we show that the infinite set of
instabilities, to all orders in \hbar and in theta, is confined to a BRS exact
cocycle. We show also that the theory is anomaly free. The quantum theory
cannot be written in terms of the Groenewald-Moyal star product, and hence
doubts arise on the interpretation of the noncommutative nature of the
underlying spacetime. Nonetheless, the deformed theory is well defined as a
quantum field theory, and the beta function of the Chern-Simons coupling
constant vanishes, as in the ordinary Chern-Simons theory.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:11:51 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Blasi",
"Alberto",
""
],
[
"Maggiore",
"Nicola",
""
]
] |
0707.3682 | Rob de Jeu | Amnon Besser, Paul Buckingham, Rob de Jeu, and Xavier-Francois Roblot | On the p-adic Beilinson conjecture for number fields | Improved presentation of p-adic L-functions; added a remark on the
compatibility of the signs between the complex and p-adic regulators. To
appear in the special volume of the Pure and Applied Math Quarterly on the
occasion of the eightieth birthday of Jean-Pierre Serre | null | null | null | math.KT math.NT | null | We formulate a conjectural p-adic analogue of Borel's theorem relating
regulators for higher K-groups of number fields to special values of the
corresponding zeta-functions, using syntomic regulators and p-adic L-functions.
We also formulate a corresponding conjecture for Artin motives, and state a
conjecture about the precise relation between the p-adic and classical
situations. Parts of he conjectures are proved when the number field (or Artin
motive) is Abelian over the rationals, and all conjectures are verified
numerically in some other cases.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:22:37 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 21:28:58 GMT"
}
] | 2007-11-19T00:00:00 | [
[
"Besser",
"Amnon",
""
],
[
"Buckingham",
"Paul",
""
],
[
"de Jeu",
"Rob",
""
],
[
"Roblot",
"Xavier-Francois",
""
]
] |
0707.3683 | Kazumasa Hattori | K. Hattori and K. Miyake | Theory of Ultrasonic Dispersion in Local Phonon Systems Coupled with
Conduction Electrons | 12 pages, 12 figures. J. Phys. Soc. Jpn. 76 (2007) in press | null | 10.1143/JPSJ.76.094603 | null | cond-mat.str-el | null | The physical origin of frequency dependence in elastic constants, which are
often found in an ultrasound propagation in filled skutterudites and clathrate
compounds, is investigated theoretically. This dependence arises from a
coupling between the acoustic phonon and some optical phonons, which strongly
interact with electrons. Using a self-consistent ladder approximation together
with a pseudofermion mapping of the phonon to the single site Holstein Anderson
model, a soft mode of the optical phonon at zero frequency is shown to emerge.
The temperature dependence of the spectral weight of this soft mode shows an
activation-type behavior, which is characterized by the optical phonon
frequency. These features can generate the frequency dependence and the
shoulder in the elastic constants observed in some filled skutterudites and
clathrate compounds.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:34:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hattori",
"K.",
""
],
[
"Miyake",
"K.",
""
]
] |
0707.3684 | Sintayehu Tesfa Woldemariam Mr | Sintayehu Tesfa | Harmonic entanglement in a degenerate parametric down conversion | 7 pages, 5 figures | null | null | null | quant-ph | null | We study the harmonic entanglement and squeezing in a two-mode radiation
produced in a degenerate parametric down conversion process coupled to a
two-mode vacuum reservoir employing the linearization procedure. It is found
that there is a quadrature entanglement between the harmonically related
fundamental and second-harmonic modes and the superimposed radiation exhibits a
significant two-mode squeezing. The entanglement exits even when there is no
two-mode squeezing, since the correlation leading to these phenomena are
essentially different. In addition, the more the external coherent light is
down converted, the more stronger the entanglement and mean photon number of
the two-mode radiation would be which is not generally true for squeezing.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:34:36 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Tesfa",
"Sintayehu",
""
]
] |
0707.3685 | Ward Struyve | Ward Struyve | Pilot-wave theory and quantum fields | 65 pages, no figures, LaTex; v2 minor changes, some extensions; v3
minor improvements; v4 some typos corrected | Rept.Prog.Phys.73:106001,2010 | 10.1088/0034-4885/73/10/106001 | null | quant-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pilot-wave theories provide possible solutions to the measurement problem. In
such theories, quantum systems are not only described by the state vector, but
also by some additional variables. These additional variables, also called
beables, can be particle positions, field configurations, strings, etc. In this
paper we focus our attention on pilot-wave theories in which the additional
variables are field configurations. The first such theory was proposed by Bohm
for the free electromagnetic field. Since Bohm, similar pilot-wave theories
have been proposed for other quantum fields. The purpose of this paper is to
present an overview and further development of these proposals. We discuss
various bosonic quantum field theories such as the Schroedinger field, the free
electromagnetic field, scalar quantum electrodynamics and the Abelian Higgs
model. In particular, we compare the pilot-wave theories proposed by Bohm and
by Valentini for the electromagnetic field, finding that they are equivalent.
We further discuss the proposals for fermionic fields by Holland and Valentini.
In the case of Holland's model we indicate that further work is required in
order to show that the model is capable of reproducing the standard quantum
predictions. We also consider a similar model, which does not seem to reproduce
the standard quantum predictions. In the case of Valentini's model we point out
a problem that seems hard to overcome.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:41:45 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Jul 2009 23:33:19 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Aug 2010 05:26:17 GMT"
},
{
"version": "v4",
"created": "Tue, 17 Aug 2010 15:39:44 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Struyve",
"Ward",
""
]
] |
0707.3686 | Ulf Leonhardt | Ulf Leonhardt and Thomas G. Philbin | Quantum optics of spatial transformation media | To appear in NANOMETA Special Issue of Journal of Optics A | null | null | null | quant-ph | null | Transformation media are at the heart of invisibility devices, perfect lenses
and artificial black holes. In this paper, we consider their quantum theory. We
show how transformation media map quantum electromagnetism in physical space to
QED in empty flat space.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:46:52 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Leonhardt",
"Ulf",
""
],
[
"Philbin",
"Thomas G.",
""
]
] |
0707.3687 | Donghe | Donghe Pei, Lingling Kong, Jianguo Sun and Qi Wang | $S_t^1\times S_s^1$-valued lightcone Gauss map of a Lorentzian surface
in semi-Euclidean 4-space | 10 pages | null | null | null | math.DG math.SG | null | We define the notions of $S_t^1\times S_s^1$-valued lightcone Gauss maps,
lightcone pedal surface and Lorentzian lightcone height function of Lorentzian
surface in semi-Euclidean 4-space and established the relationships between
singularities of these objects and geometric invariants of the surface as
applications of standard techniques of singularity theory for the Lorentzian
lightcone height function.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:47:04 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Pei",
"Donghe",
""
],
[
"Kong",
"Lingling",
""
],
[
"Sun",
"Jianguo",
""
],
[
"Wang",
"Qi",
""
]
] |
0707.3688 | Adrian Signer | Adrian Signer | Combined fixed-order and effective-theory approach to $b \bar{b}$ sum
rules | 16 pages, 7 figures, | Phys.Lett.B654:206-214,2007 | 10.1016/j.physletb.2007.08.069 | IPPP/07/41 | hep-ph | null | We combine the fixed-order evaluation of the $b\bar{b}$ sum rules with a
non-relativistic effective-theory approach. The combined result for the $n$-th
moment includes all terms suppressed with respect to the leading-order result
by ${\cal O}(\alpha_s^3)$ and ${\cal O}((\alpha_s \sqrt{n})^l \alpha_s^2)$,
counting $\alpha_s \sqrt{n} \sim 1$. When compared to experimental data, the
moments thus obtained show a remarkable consistency and allow for an analysis
in the whole range $1\le n\lesssim 16$.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 08:51:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Signer",
"Adrian",
""
]
] |
0707.3689 | Yoshifumi R. Shimizu | Yoshifumi R. Shimizu, Takuya Shoji, and Masayuki Matsuzaki | Parametrizations of triaxial deformation and E2 transitions of the
wobbling band | 10 pages, 9 figures | Phys.Rev.C77:024319,2008 | 10.1103/PhysRevC.77.024319 | null | nucl-th | null | By the very definition the triaxial deformation parameter $\gamma$ is related
to the expectation values of the K=0 and K=2 components of the intrinsic
quadrupole tensor operator. On the other hand, using the same symbol
"$\gamma$", various different parametrizations of triaxial deformation have
been employed, which are suitable for various types of the mean-field
potentials. It is pointed out that the values of various "$\gamma$" are quite
different for the same actual triaxial deformation, especially for the large
deformation; for example, the difference can be almost a factor two for the
case of the triaxial superdeformed bands recently observed in the Hf and Lu
nuclei. In our previous work, we have studied the wobbling band in Lu nuclei by
using the microscopic framework of the cranked Nilsson mean-field and the
random phase approximation, where the most serious problem is that the
calculated B(E2) value is about factor two smaller. It is shown that the origin
of this underestimation can be mainly attributed to the small triaxial
deformation; if is used the same triaxial deformation as in the analysis of the
particle-rotor model, the calculated B(E2) increases and gives correct
magnitude compared with the experimental data.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:02:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Shimizu",
"Yoshifumi R.",
""
],
[
"Shoji",
"Takuya",
""
],
[
"Matsuzaki",
"Masayuki",
""
]
] |
0707.3690 | Alfredo Iorio | Alfredo Iorio and Siddhartha Sen | Virus Structure: From Crick and Watson to a New Conjecture | 12 pages, 5 eps figures. Invited talk by A.I. at the Fourth
International Summer School and Workshop on Nuclear Physics Methods and
Accelerators in Biology and Medicine - Prague, 8-19 July 2007 | null | null | null | q-bio.QM cond-mat.mtrl-sci cond-mat.soft math-ph math.MP | null | We conjecture that certain patterns (scars), theoretically and numerically
predicted to be formed by electrons arranged on a sphere to minimize the
repulsive Coulomb potential (the Thomson problem) and experimentally found in
spherical crystals formed by self-assembled polystyrene beads (an instance of
the generalized Thomson problem), could be relevant to extend the classic
Caspar and Klug construction for icosahedrally-shaped virus capsids. The main
idea is that scars could be produced at an intermediate stage of the assembly
of the virus capsids and the release of the bending energy present in scars
into stretching energy could allow for a variety of non-spherical capsids'
shapes. The conjecture can be tested in experiments on the assembly of
artificial protein-cages where these scars should appear.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:52:12 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Iorio",
"Alfredo",
""
],
[
"Sen",
"Siddhartha",
""
]
] |
0707.3691 | Michal Bejger | J. L. Zdunik, M. Bejger, P. Haensel, E. Gourgoulhon | Strong first-order phase transition in a rotating neutron star core and
the associated energy release | 9 pages, 12 figures, submitted to A&A | A&A 479, 515-522 (2008) | 10.1051/0004-6361:20078346 | null | astro-ph | null | We calculate the energy release associated with a strong first-order phase
transition, from normal phase N to an "exotic" superdense phase S, in a
rotating neutron star. Such a phase transition, accompanied by a density jump
rho_N --> rho_S, is characterized by rho_S/rho_N > 3/2(1+P_0/rho_N c^2), where
P_0 is the pressure, at which phase transition occurs. Configurations with
small S-phase cores are then unstable and collapse into stars with large
S-phase cores. The energy release is equal to the difference in mass-energies
between the initial (normal) configuration and the final configuration
containing an S-phase core, total stellar baryon mass and angular momentum
being kept constant. The calculations of the energy release are based on
precise numerical 2-D calculations. Polytropic equations of state (EOSs) as
well as realistic EOS with strong first-order phase transition due to kaon
condensation are used. For polytropic EOSs, a large parameter space is studied.
For a fixed "overpressure", dP, defined as the relative excess of central
pressure of collapsing metastable star over the pressure of equilibrium
first-order phase transition, the energy release E_rel does not depend on the
stellar angular momentum. It coincides with that for nonrotating stars with the
same dP. Therefore, results of 1-D calculations of E_rel(dP) for non-rotating
stars can be used to predict, with very high precision, the outcome of much
harder to perform 2-D calculations for rotating stars with the same dP. This
result holds also for dP_min < dP < 0, corresponding to phase transitions with
climbing over the energy barrier separating metastable N-phase configurations
from those with an S-phase core. Such phase transitions could be realized in
the cores of newly born, hot, pulsating neutron stars.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:17:26 GMT"
}
] | 2008-05-13T00:00:00 | [
[
"Zdunik",
"J. L.",
""
],
[
"Bejger",
"M.",
""
],
[
"Haensel",
"P.",
""
],
[
"Gourgoulhon",
"E.",
""
]
] |
0707.3692 | Nataliya A. Goncharuk | L. Smrcka, N. A. Goncharuk, P. Svoboda, P. Vasek, Yu. Krupko, W.
Wegscheider | Electron magnetotransport in GaAs/AlGaAs superlattices with weak and
strong inter-well coupling | 3 pages, 3 figures, elsart/PHYEAUTH macros; presented on the LDSD
2007 Conference in the Caribbean Archipelago San Andres, Colombia. To be
published as a special issue of Microelectronics Journal (Elsevier) | Microelectronics Journal 39, 411 (2008) | 10.1016/j.mejo.2007.07.013 | null | cond-mat.mes-hall cond-mat.other | null | We report on magnetotransport measurements in two MBE-grown GaAs/AlGaAs
superlattices formed by wide and narrow quantum wells and thin Si-doped
barriers subject to tilted magnetic fields. It has been shown that illumination
of the strongly coupled superlattice with narrow wells leads to reduction of
its dimensionality from the 3D to 2D. The illumination-induced transition is
revealed by remarkable change of magnetoresistance curves as compared to those
measured before illumination. The experimental data along with tight-binding
model calculations indicate that the illumination not only enhances the
electron concentration but also suppresses the electron tunneling through the
barriers.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:16:20 GMT"
}
] | 2011-05-05T00:00:00 | [
[
"Smrcka",
"L.",
""
],
[
"Goncharuk",
"N. A.",
""
],
[
"Svoboda",
"P.",
""
],
[
"Vasek",
"P.",
""
],
[
"Krupko",
"Yu.",
""
],
[
"Wegscheider",
"W.",
""
]
] |
0707.3693 | Vasil Bregadze | Vasil G. Bregadze, Eteri S. Gelagutashvili, Irene G. Khutsishvili,
Khatuna G. Sologashvili, Ketevan J. Tsakadze | Thermodynamic model of interaction of small ligands with DNA | 11 pages, 0 figures | null | null | null | physics.bio-ph | null | We have managed to correlate the stability constants of complex formation,
which can be registered in equilibrium state, to the dynamic characteristic of
the complex lifetime. Thus, the principal concept of molecular biophysics
regarding biomolecule, structure-dynamics-function can be reformatted as
structure-stability-function. It should be specially noted that such an
approach highly simplifies end widens the time interval of investigation of
dynamic characteristics of macromolecules.
Study of hydration energy and hydration number by kinetic curves of water
desorption from Na-DNA humidified fibers by glow discharge atomic spectral
analysis of hydrogen allowed us to reveal that after transition of DNA from B
form to unordered state the activation energy of hydrated water desorption
increases by 0.65kcal/Mole of water. This increase of energy is 0.1 kcal/Mole
for transition from B to C form (from 20 to 10 water molecules per nucleotide)
and 0.55 kcal/Mole for the one from C form to A unordered state (from 10 to 5
molecules per nucleotide).
Simultaneous use of UDS and AES allows identifying the number of Wrong
Watson-Crick pairs in DNA. The quantitative analysis is based on increase of
informativity of UDS via its combination with atomic-emission spectroscopy. The
number of the total metal-induced tautomerization makes six hundred per million
base pairs of DNA. Such approach enables estimation of risk factors during
clinical check-ups and evaluation of DNA suitability for nanotechnological
purposes.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:19:02 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Bregadze",
"Vasil G.",
""
],
[
"Gelagutashvili",
"Eteri S.",
""
],
[
"Khutsishvili",
"Irene G.",
""
],
[
"Sologashvili",
"Khatuna G.",
""
],
[
"Tsakadze",
"Ketevan J.",
""
]
] |
0707.3694 | Gwyn Bellamy | Gwyn Bellamy | On singular Calogero-Moser spaces | Conjecture 1.3 of version 1 is proved as Corollary 4.2. Inconsistent
use of notation in the proof of Lemma 3.3 corrected (thanks to Ulrich Thiel
for pointing this out) | null | 10.1112/blms/bdp019 | null | math.RT math.AG math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using combinatorial properties of complex reflection groups, we show that the
generalised Calogero-Moser space associated to the centre of the corresponding
rational Cherednik algebra is singular for all values of its deformation
parameter c if and only if the group is different from the wreath product
$S_n\wr C_m$ and the binary tetrahedral group. This result and a theorem of
Ginzburg and Kaledin imply that there does not exist a symplectic resolution of
the singular symplectic variety h+h*/W outside of these cases; conversely we
show that there exists a symplectic resolution for the binary tetrahedral group
(Hilbert schemes provide resolutions for the wreath product case).
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:29:00 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 19:17:08 GMT"
},
{
"version": "v3",
"created": "Thu, 8 Aug 2013 21:11:25 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Bellamy",
"Gwyn",
""
]
] |
0707.3695 | Alessandro Romito | Alessandro Romito, Yuval Gefen, Yaroslav M. Blanter | Weak values of electron spin in a double quantum dot | 4+ pages, 3 figures, final published version | Phys. Rev. Lett. 100, 056801 (2008) | 10.1103/PhysRevLett.100.056801 | null | cond-mat.mes-hall cond-mat.str-el | null | We propose a protocol for a controlled experiment to measure a weak value of
the electron's spin in a solid state device. The weak value is obtained by a
two step procedure -- weak measurement followed by a strong one
(post-selection), where the outcome of the first measurement is kept provided a
second post-selected outcome occurs. The set-up consists of a double quantum
dot and a weakly coupled quantum point contact to be used as a detector.
Anomalously large values of the spin of a two electron system are predicted, as
well as negative values of the total spin. We also show how to incorporate the
adverse effect of decoherence into this procedure.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:24:35 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 16:41:07 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Mar 2008 14:04:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Romito",
"Alessandro",
""
],
[
"Gefen",
"Yuval",
""
],
[
"Blanter",
"Yaroslav M.",
""
]
] |
0707.3696 | Yurij Holovatch | O.Mryglod, Yu.Holovatch | Towards journalometrical analysis of a scientific periodical: a case
study | null | Condens. Matter Phys., vol. 10 (2007) pp. 129-141 | null | null | physics.data-an physics.soc-ph | null | In this paper we use several approaches to analyse a scientific journal as a
complex system and to make a possibly more complete description of its current
state and evolution. Methods of complex networks theory, statistics, and
queueing theory are used in this study. As a subject of the analysis we have
chosen the journal ``Condensed Matter Physics''
(http://www.icmp.lviv.ua/journal/). In particular, based on the statistical
data regarding the papers published in this journal since its foundation in
1993 up to now we have composed the co-authorship network and extracted its
main quantitative characteristics. Further, we analyse the priorities of
scientific trends reflected in the journal and its impact on the publications
in other editions (the citation ratings). Moreover, to characterize an
efficiency of the paper processing, we study the time dynamics of editorial
processing in terms of queueing theory and human activity analysis.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:19:19 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Mryglod",
"O.",
""
],
[
"Holovatch",
"Yu.",
""
]
] |
0707.3697 | Akhilesh Ranjan | Akhilesh Ranjan and V. Ravishankar | Chromoelectric response functions for quark-gluon plasma | 11 pages, The paper rewritten in collisionless limit; equations are
simplified and made more compact; minor change in the title; and references
added | null | null | null | nucl-th hep-ph | null | We determine the chromoelectric response of quark-gluon plasma (QGP)
systematically within the framework of classical transport equations. The
transport equations are set up in the phase space which includes the SU(3)
group space corresponding to color (which is a dynamical degree of freedom), in
addition to the position - momentum variables. The distribution functions are
defined by projecting the density operators for the quarks and the gluons to
their respective coherent states (defined over the extended phase space). The
full import of the Yang-Mills(YM) dynamics is shown to manifest through the
emergence of an intrinsic nonlinear, nonlocal response, whose behavior we
determine in the long wavelength limit. It also manifests as a tensor response
which is a characteristic of gluons. The response functions are shown to have a
natural interpretation in terms of the renormalizations of the Abelian and the
non-Abelian coupling constants. A detailed analysis of the screening of heavy
quark potential and of the exact role played by the Debye mass screening in the
case of the Cornell potential, is performed. We also discuss the non-Abelian
contribution to Landau damping in QGP.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:52:49 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 07:18:15 GMT"
},
{
"version": "v3",
"created": "Wed, 20 Feb 2008 16:02:39 GMT"
}
] | 2008-02-20T00:00:00 | [
[
"Ranjan",
"Akhilesh",
""
],
[
"Ravishankar",
"V.",
""
]
] |
0707.3698 | Tapio Simula | T. P. Simula, N. Nygaard, S. X. Hu, L. A. Collins, B. I. Schneider,
and K. Molmer | Angular momentum exchange between coherent light and matter fields | 4 pages, 4 figures | Phys. Rev. A 77, 015401 (2008) | 10.1103/PhysRevA.77.015401 | null | cond-mat.soft | null | Full, three dimensional, time-dependent simulations are presented
demonstrating the quantized transfer of angular momentum to a Bose-Einstein
condensate from a laser carrying orbital angular momentum in a
Laguerre-Gaussian mode. The process is described in terms of coherent Bragg
scattering of atoms from a chiral optical lattice. The transfer efficiency and
the angular momentum content of the output coupled vortex state are analyzed
and compared with a recent experiment.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 09:55:13 GMT"
}
] | 2008-07-10T00:00:00 | [
[
"Simula",
"T. P.",
""
],
[
"Nygaard",
"N.",
""
],
[
"Hu",
"S. X.",
""
],
[
"Collins",
"L. A.",
""
],
[
"Schneider",
"B. I.",
""
],
[
"Molmer",
"K.",
""
]
] |
0707.3699 | Changzheng Yuan | X. L. Wang, et al, Belle Collaboration | Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via
Initial State Radiation at Belle | 10 pages, 5 figures, 2 tables, version to appear in Phys. Rev. Lett | Phys.Rev.Lett.99:142002,2007 | 10.1103/PhysRevLett.99.142002 | Belle Preprint 2007-33; KEK Preprint 2007-27 | hep-ex hep-ph | null | The cross section for e+e- to pi+ pi- psi(2S) between threshold and
\sqrt{s}=5.5 GeV is measured using 673 fb^{-1} of data on and off the
\Upsilon(4S) resonance collected with the Belle detector at KEKB. Two resonant
structures are observed in the pi+ pi- psi(2S) invariant mass distribution, one
at 4361\pm 9\pm 9 MeV/c2 with a width of 74\pm 15\pm 10 MeV/c2, and another at
4664\pm 11\pm 5 MeV/c2 with a width of 48\pm 15\pm 3 MeV/c2, if the mass
spectrum is parameterized with the coherent sum of two Breit-Wigner functions.
These values do not match those of any of the known charmonium states.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:01:58 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 00:24:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"X. L.",
""
],
[
"Collaboration",
"Belle",
""
]
] |
0707.3700 | Gianluca Mandanici | Gianluca Mandanici | Undeformed (additive) energy conservation law in Doubly Special
Relativity | 5 pages; A comparison with a previous analysis has been added | null | 10.1142/S0217732309030424 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All the Doubly Special Relativity (DSR) models studied in literature so far
involve a deformation of the energy conservation rule that forces us to release
the hypothesis of the additivity of the energy for composite systems. In view
of the importance of the issue for a consistent formulation of a DSR
statistical mechanics and a DSR thermodynamics, we show that DSR models
preserving the usual (i.e. additive) energy conservation rule can be found.
These models allow the construction of a DSR-covariant extensive energy. The
implications of the analysis for the dynamics of DSR-covariant multiparticle
systems are also briefly discussed.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:08:43 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Nov 2008 20:30:56 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Mandanici",
"Gianluca",
""
]
] |
0707.3701 | R. Winkler | U. Z\"ulicke, R. Winkler, J. Bolte | Nanospintronics meets relativistic quantum physics: Ubiquity of
Zitterbewegung effects | 4 pages, elsart style | Physica E 40, 1434 (2008) | 10.1016/j.physe.2007.09.035 | null | cond-mat.mes-hall | null | We present a unified description of zitterbewegung-like phenomena for
electron and hole systems showing Rashba spin splitting as well as for
electrons in single-layer and bilayer graphene. The former class of systems can
be interpreted as "nonrelativistic" whereas the latter are often called
"ultrarelativistic" so that our unified description indicates an interesting
connection between these two opposite limits.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 14:54:09 GMT"
}
] | 2008-09-26T00:00:00 | [
[
"Zülicke",
"U.",
""
],
[
"Winkler",
"R.",
""
],
[
"Bolte",
"J.",
""
]
] |
0707.3702 | Christian Romelsberger | Christian Romelsberger | Calculating the Superconformal Index and Seiberg Duality | 25 pages | null | null | null | hep-th | null | We develop techniques to calculate an index for four dimensional
superconformal field theories. This superconformal index is counting BPS
operators which preserve only one supercharge. To calculate the superconformal
index we quantize the field theory on S^3 X R and show that the twisted theory
has an appropriate mass gap. This allows for the interactions to be switched
off continuously without the superconformal index being changed. We test those
techniques for theories which go through a non-trivial RG flow and for Seiberg
dual theories. This leads to the conjecture of some group/number theoretical
identities.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 18:18:26 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Romelsberger",
"Christian",
""
]
] |
0707.3703 | Anca Gheorghiu | Ion Spanulescu, Anca Gheorghiu | Economic Amplifier - A New Econophysics Model | 13 pages, 6 figures | null | null | null | q-fin.GN physics.soc-ph | null | Most of the econometric and econophysics models have been borrowed from the
statistical physics, and as a cosequence, a new interdisciplinary science
called econophysics has emerged. In this paper we planned to extend the analogy
between different economic processes or phenomena and processes and phenomena
from different fields of physics, other than statistical physics. On the basis
of the economic development process and amplification phenomenon analogy, a new
econophysics model, named economic amplifier, on the electronic amplification
principle from applied physics was proposed und largely analyzed.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:16:54 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Spanulescu",
"Ion",
""
],
[
"Gheorghiu",
"Anca",
""
]
] |
0707.3704 | Pere Pascual | F. Guillen Santos, V. Navarro, P. Pascual, Agusti Roig | A Cartan-Eilenberg approach to Homotopical Algebra | null | null | null | null | math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose an approach to homotopical algebra where the basic
ingredient is a category with two classes of distinguished morphisms: strong
and weak equivalences. These data determine the cofibrant objects by an
extension property analogous to the classical lifting property of projective
modules. We define a Cartan-Eilenberg category as a category with strong and
weak equivalences such that there is an equivalence between its localization
with respect to weak equivalences and the localised category of cofibrant
objets with respect to strong equivalences. This equivalence allows us to
extend the classical theory of derived additive functors to this non additive
setting. The main examples include Quillen model categories and functor
categories with a triple, in the last case we find examples in which the class
of strong equivalences is not determined by a homotopy relation. Among other
applications, we prove the existence of filtered minimal models for \emph{cdg}
algebras over a zero-characteristic field and we formulate an acyclic models
theorem for non additive functors.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:18:03 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 08:21:59 GMT"
},
{
"version": "v3",
"created": "Thu, 18 Sep 2008 09:33:23 GMT"
}
] | 2008-09-18T00:00:00 | [
[
"Santos",
"F. Guillen",
""
],
[
"Navarro",
"V.",
""
],
[
"Pascual",
"P.",
""
],
[
"Roig",
"Agusti",
""
]
] |
0707.3705 | Fabio Cavaliere | U. De Giovannini, F. Cavaliere, R. Cenni, M. Sassetti, and B. Kramer | Spin projected unrestricted Hartree-Fock ground states for harmonic
quantum dots | 12 pages, 5 tables, 10 figures, submitted to Phys. Rev. B | Phys. Rev. B 77, 035325 (2008) | 10.1103/PhysRevB.77.035325 | null | cond-mat.mes-hall | null | We report results for the ground state energies and wave functions obtained
by projecting spatially unrestricted Hartree Fock states to eigenstates of the
total spin and the angular momentum for harmonic quantum dots with $N\leq 12$
interacting electrons including a magnetic field states with the correct
spatial and spin symmetries have lower energies than those obtained by the
unrestricted method. The chemical potential as a function of a perpendicular
magnetic field is obtained. Signature of an intrinsic spin blockade effect is
found.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:27:45 GMT"
}
] | 2011-10-10T00:00:00 | [
[
"De Giovannini",
"U.",
""
],
[
"Cavaliere",
"F.",
""
],
[
"Cenni",
"R.",
""
],
[
"Sassetti",
"M.",
""
],
[
"Kramer",
"B.",
""
]
] |
0707.3706 | Schoeffel Laurent | L. Schoeffel (DAPNIA, Saclay) | QCD analysis of diffractive phenomena | 9 pages, 10 figures, proceedings of the conference PHYSICS IN
COLLISION, Annecy, France, 26 - 29 june 2007 | Acta Phys.Polon.Supp.1:379-388,2008 | null | null | hep-ph | null | The most important results on subnuclear diffractive phenomena obtained at
HERA and Tevtaron are reviewed and new issues in nucleon tomography are
discussed. Some challenges for understanding diffraction at the LHC, including
the discovering of the Higgs boson, are outlined.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:30:36 GMT"
}
] | 2009-06-12T00:00:00 | [
[
"Schoeffel",
"L.",
"",
"DAPNIA, Saclay"
]
] |
0707.3707 | Moshe Shuker | M. Shuker, O. Firstenberg, R. Pugatch, A. Ron, N. Davidson | Storing images in warm atomic vapor | null | Phys. Rev Lett. 100, 223601 (2008) | 10.1103/PhysRevLett.100.223601 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reversible and coherent storage of light in atomic medium is a key-stone of
future quantum information applications. In this work, arbitrary
two-dimensional images are slowed and stored in warm atomic vapor for up to 30
$\mu$s, utilizing electromagnetically induced transparency. Both the intensity
and the phase patterns of the optical field are maintained. The main limitation
on the storage resolution and duration is found to be the diffusion of atoms. A
techniqueanalogous to phase-shift lithography is employed to diminish the
effect of diffusion on the visibility of the reconstructed image.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 10:38:03 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jun 2008 03:40:40 GMT"
}
] | 2008-06-17T00:00:00 | [
[
"Shuker",
"M.",
""
],
[
"Firstenberg",
"O.",
""
],
[
"Pugatch",
"R.",
""
],
[
"Ron",
"A.",
""
],
[
"Davidson",
"N.",
""
]
] |
0707.3708 | WenAn Yong | Wen-an Yong | An Interesting Class of Partial Differential Equations | null | null | null | null | math-ph math.MP | null | This paper presents an observation that under reasonable conditions, many
partial differential equations from mathematical physics possess three
structural properties. One of them can be understand as a variant of the
celebrated Onsager reciprocal relation in Modern Thermodynamics. It displays a
direct relation of irreversible processes to the entropy change. We show that
the properties imply various entropy dissipation conditions for hyperbolic
relaxation problems. As an application of the observation, we propose an
approximation method to solve relaxation problems. Moreover, the observation is
interpreted physically and verified with eight (sets of) systems from different
fields.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:00:40 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Aug 2007 11:08:58 GMT"
}
] | 2007-08-28T00:00:00 | [
[
"Yong",
"Wen-an",
""
]
] |
0707.3709 | Bart Leurs | B.W.A.Leurs, K.E. Luna and J. Zaanen | Inhomogeneous states and nodal fermions in the SU(2) gauge theory | 16 pages, 8 figures | null | null | null | cond-mat.str-el | null | We discuss the issue of phase separation in the SU(2) slave boson theory of
Wen and Lee of the doped Mott insulator. It is shown that the constraint
structure of the theory leads to the interpretation of the holons to have
hard-core interactions, which is demonstrated further by studying the empty
limit (no electrons). Surprisingly, with hard-core interactions even the empty
limit is described well by the slave-boson theory, both as an energy density
and with the regard to dynamical properties. The consequences are investigated
in the overdoped superconducting regime, where both phase separation and a d+s
structure of the order parameter is obtained. This s-wave component is already
imminent in the description of the hole in the slave boson theory. The
interacting nature of the holons also lead to sound modes in the
single-electron propagator. The novel idea of the isospin spiral is introduced,
based on the projective symmetry principles of Wen. This isospin spiral
explains the coexistence of superconductivity and the Mott insulating state,
being the consequence of phase separation. Secondly, it might be able to
explain why nodal fermions survive in the presence of charge inhomogeneities.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:09:19 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Leurs",
"B. W. A.",
""
],
[
"Luna",
"K. E.",
""
],
[
"Zaanen",
"J.",
""
]
] |
0707.3710 | Davron Matrasulov | D. U. Matrasulov, J. R. Yusupov, P. K. Khabibullaev, A. A. Saidov | Casimir Effect for Quantum Graphs | null | null | null | null | quant-ph | null | The Casimir effects for one-dimensional fractal networks, so-called quantum
graphs is studied. Based on the Green function approach for quantum graphs
zero-point energy for some simplest topologies is written explicitly.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:17:37 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Matrasulov",
"D. U.",
""
],
[
"Yusupov",
"J. R.",
""
],
[
"Khabibullaev",
"P. K.",
""
],
[
"Saidov",
"A. A.",
""
]
] |
0707.3711 | Tetsuya Asai | Tetsuya Asai | Elliptic Gauss Sums and Hecke L-values at s=1 | 39 pages | null | null | null | math.NT | null | The rationality of the elliptic Gauss sum coefficient is shown. The following
is a specific case of our argument.
Let f(u)=sl((1-i)\varpi u), where sl() is the Gauss' lemniscatic sine and
\varpi=2.62205... is the real period of the elliptic curve y^2=x^3-x, so that
f(u) is an elliptic function relative to the period lattice Z[i].
Let \pi be a primary prime of Z[i] such that norm(\pi)\equiv 13\mod 16. Let S
be the quarter set mod \pi consisting of quartic residues.
Let us define G(\pi):=\sum_{\nu\in S} f(\nu/\pi) and
\tilde{\pi}:=\prod_{\nu\in S} f(\nu/\pi).
The former G(\pi) is a typical example of elliptic Gauss sum; the latter is
regarded as a canonical 4-th root of -\pi: (\tilde{\pi})^4=-\pi. Then we have
Theorem: G(\pi)/(\tilde{\pi})^3 is a rational odd integer.
G(\pi) appears naturally in the central value of Hecke L associated to the
quartic residue character mod \pi, and our proof is based on the functional
equation of L and an explicit formula of the root number. In fact, the latter
is nothing but the Cassels-Matthews formula on the quartic Gauss sum.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:27:23 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Asai",
"Tetsuya",
""
]
] |
0707.3712 | Dong Phung Van | P. V. Dong, D. T. Huong, N. T. Thuy, H. N. Long | Higgs phenomenology of supersymmetric economical 3-3-1 model | 33 pages, 1 figure | Nucl.Phys.B795:361-384,2008 | 10.1016/j.nuclphysb.2007.11.035 | null | hep-ph | null | We explore the Higgs sector in the supersymmetric economical 3-3-1 model and
find new features in this sector. The charged Higgs sector is revised i.e., in
difference of the previous work, the exact eigenvalues and states are obtained
without any approximation. In this model, there are three Higgs bosons having
masses equal to that of the gauge bosons--the W and extra X and Y. There is one
scalar boson with mass of 91.4 GeV, which is closed to the $Z$ boson mass and
in good agreement with present limit: 89.8 GeV at 95% CL. The condition of
eliminating for charged scalar tachyon leads to splitting of VEV at the first
symmetry breaking, namely, $w \simeq w^\prime$. The interactions among the
standard model gauge bosons and scalar fields in the framework of the
supersymmetric economical 3-3-1 model are presented. From these couplings, at
some limit, almost scalar Higgs fields can be recognized in accordance with the
standard model. The hadronic cross section for production of the bilepton
charged Higgs boson at the CERN LHC in the effective vector boson approximation
is calculated. Numerical evaluation shows that the cross section can exceed
35.8 fb.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:27:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dong",
"P. V.",
""
],
[
"Huong",
"D. T.",
""
],
[
"Thuy",
"N. T.",
""
],
[
"Long",
"H. N.",
""
]
] |
0707.3713 | Shojiro Kimura | S. Kimura, T. Takeuchi, K. Okunishi, M. Hagiwara, Z. He, K. Kindo, T.
Taniyama and M. Itoh | Novel ordering of an S = 1/2 quasi one-dimensional Ising-like
anitiferromagnet in magnetic field | 4pages, 4figures | null | 10.1103/PhysRevLett.100.057202 | null | cond-mat.str-el | null | High-field specific heat measurements on BaCo2V2O8, which is a good
realization of an S = 1/2 quasi one-dimensional Ising-like antifferomagnet,
have been performed in magnetic fields up to 12 T along the chain and at
temperature down to 200 mK. We have found a new magnetic ordered state in the
field-induced phase above Hc ~ 3.9 T. We suggest that a novel type of the
incommensurate order, which has no correspondence to the classical spin system,
is realized in the field-induced phase.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:38:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kimura",
"S.",
""
],
[
"Takeuchi",
"T.",
""
],
[
"Okunishi",
"K.",
""
],
[
"Hagiwara",
"M.",
""
],
[
"He",
"Z.",
""
],
[
"Kindo",
"K.",
""
],
[
"Taniyama",
"T.",
""
],
[
"Itoh",
"M.",
""
]
] |
0707.3714 | James Dufty | James W. Dufty | Nonequilibrium Statistical Mechanics and Hydrodynamics for a Granular
Fluid | notes prepared as the basis for six lectures at the Second Warsaw
School on Statistical Physics held in Kazimierz, Poland, June 2007 | null | null | null | cond-mat.stat-mech cond-mat.soft | null | Granular fluids consist of collections of activated mesoscopic or macroscopic
particles (e.g., powders or grains) whose flows often appear similar to those
of normal fluids. To explore the qualitative and quantitative description of
these flows an idealized model for such fluids, a system of smooth inelastic
hard spheres, is considered. The single feature distinguishing granular and
normal fluids being explored in this way is the inelasticity of collisions. The
dominant differences observed in real granular fluids are indeed captured by
this feature. Following a brief introductory description of real granular
fluids and motivation for the idealized model, the elements of nonequilibrium
statistical mechanics are recalled (observables, states, and their dynamics).
Peculiarities of the hard sphere interactions are developed in detail. The
exact microscopic balance equations for the number, energy, and momentum
densities are derived and their averages described as the origin for a possible
macroscopic continuum mechanics description. This formally exact analysis leads
to closed, macroscopic hydrodynamic equations through the notion of a "normal"
state. This concept is introduced and the Navier-Stokes constitutive equations
are derived, with associated Green-Kubo expressions for the transport
coefficients. A parallel description of granular gases is described in the
context of kinetic theory, and the Boltzmann limit is identified critically.
The construction of the "normal" solution to the kinetic equation is outlined,
and Navier-Stokes order hydrodynamic equations are re-derived for a low density
granular gas.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:39:06 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Dufty",
"James W.",
""
]
] |
0707.3715 | Bernard Bercu | Bernard Bercu, Abderrahmen Touati | Exponential inequalities for self-normalized martingales with
applications | Published in at http://dx.doi.org/10.1214/07-AAP506 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 5, 1848-1869 | 10.1214/07-AAP506 | IMS-AAP-AAP506 | math.ST math.PR stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose several exponential inequalities for self-normalized martingales
similar to those established by De la Pe\~{n}a. The keystone is the
introduction of a new notion of random variable heavy on left or right.
Applications associated with linear regressions, autoregressive and branching
processes are also provided.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:44:04 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Nov 2008 11:26:18 GMT"
}
] | 2008-11-14T00:00:00 | [
[
"Bercu",
"Bernard",
""
],
[
"Touati",
"Abderrahmen",
""
]
] |
0707.3716 | Lorenzo Farina | Maria Concetta Palumbo, Lorenzo Farina, Alberto De Santis, Alessandro
Giuliani, Alfredo Colosimo, Giorgio Morelli and Ida Ruberti | Post-transcriptional Regulation Drives Temporal Compartmentalization of
the Yeast Metabolic Cycle | 13 pages, 4 figures, 1 table | null | null | null | q-bio.CB q-bio.BM | null | The maintainance of a stable periodicity during the yeast metabolic cycle
involving approximately half of the genome requires a very strict and efficient
control of gene expression. For this reason, the metabolic cycle is a very good
candidate for testing the role of a class of post-transcriptional regulators,
the so called PUF-family, whose genome-wide mRNA binding specificity was
recently experimentally assessed. Here we show that an integrated computational
analysis of gene expression time series during the metabolic cycle and the mRNA
binding specificity of PUF-family proteins allow for a clear demonstration of
the very specific role exerted by selective post-transcriptional mRNA
degradation in yeast metabolic cycle global regulation.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:21:28 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Palumbo",
"Maria Concetta",
""
],
[
"Farina",
"Lorenzo",
""
],
[
"De Santis",
"Alberto",
""
],
[
"Giuliani",
"Alessandro",
""
],
[
"Colosimo",
"Alfredo",
""
],
[
"Morelli",
"Giorgio",
""
],
[
"Ruberti",
"Ida",
""
]
] |
0707.3717 | Yann Busnel | Yann Busnel (IRISA, DIT), Marin Bertier (IRISA), Eric Fleury (INRIA
Rh\^one-Alpes), Anne-Marie Kermarrec (IRISA) | GCP: Gossip-based Code Propagation for Large-scale Mobile Wireless
Sensor Networks | null | null | null | null | cs.NI | null | Wireless sensor networks (WSN) have recently received an increasing interest.
They are now expected to be deployed for long periods of time, thus requiring
software updates. Updating the software code automatically on a huge number of
sensors is a tremendous task, as ''by hand'' updates can obviously not be
considered, especially when all participating sensors are embedded on mobile
entities. In this paper, we investigate an approach to automatically update
software in mobile sensor-based application when no localization mechanism is
available. We leverage the peer-to-peer cooperation paradigm to achieve a good
trade-off between reliability and scalability of code propagation. More
specifically, we present the design and evaluation of GCP ({\emph Gossip-based
Code Propagation}), a distributed software update algorithm for mobile wireless
sensor networks. GCP relies on two different mechanisms (piggy-backing and
forwarding control) to improve significantly the load balance without
sacrificing on the propagation speed. We compare GCP against traditional
dissemination approaches. Simulation results based on both synthetic and
realistic workloads show that GCP achieves a good convergence speed while
balancing the load evenly between sensors.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:52:09 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jul 2007 12:21:45 GMT"
}
] | 2007-07-30T00:00:00 | [
[
"Busnel",
"Yann",
"",
"IRISA, DIT"
],
[
"Bertier",
"Marin",
"",
"IRISA"
],
[
"Fleury",
"Eric",
"",
"INRIA\n Rhône-Alpes"
],
[
"Kermarrec",
"Anne-Marie",
"",
"IRISA"
]
] |
0707.3718 | Janusz Rosiek | Athanasios Dedes, Howard E. Haber and Janusz Rosiek | Seesaw mechanism in the sneutrino sector and its consequences | 69 pages, 5 figures, uses axodraw.sty. Version accepted for
publication in JHEP: some comments and one more Appendix with additional
discussion added, references updated | JHEP 0711:059,2007 | 10.1088/1126-6708/2007/11/059 | IPPP-07-16, CPT-07-32, SCIPP-07/10 | hep-ph | null | The seesaw-extended MSSM provides a framework in which the observed light
neutrino masses and mixing angles can be generated in the context of a natural
theory for the TeV-scale. Sneutrino-mixing phenomena provide valuable tools for
connecting the physics of neutrinos and supersymmetry. We examine the
theoretical structure of the seesaw-extended MSSM, retaining the full
complexity of three generations of neutrinos and sneutrinos. In this general
framework, new flavor-changing and CP-violating sneutrino processes are
allowed, and are parameterized in terms of two $3\times 3$ matrices that
respectively preserve and violate lepton number. The elements of these matrices
can be bounded by analyzing the rate for rare flavor-changing decays of charged
leptons and the one-loop contribution to neutrino masses. In the former case,
new contributions arise in the seesaw extended model which are not present in
the ordinary MSSM. In the latter case, sneutrino--antisneutrino mixing
generates the leading correction at one-loop to neutrino masses, and could
provide the origin of the observed texture of the light neutrino mass matrix.
Finally, we derive general formulae for sneutrino--antisneutrino oscillations
and sneutrino flavor-oscillations. Unfortunately, neither oscillation phenomena
is likely to be observable at future colliders.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:57:25 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 09:27:39 GMT"
},
{
"version": "v3",
"created": "Wed, 7 Nov 2007 21:57:11 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Dedes",
"Athanasios",
""
],
[
"Haber",
"Howard E.",
""
],
[
"Rosiek",
"Janusz",
""
]
] |
0707.3719 | Konstantin Klemm | Konstantin Klemm, Christoph Flamm, Peter F. Stadler | Funnels in Energy Landscapes | 6 pages, 3 figures, submitted to European Conference on Complex
Systems 2007 | null | 10.1140/epjb/e2008-00136-7 | null | q-bio.BM | null | Local minima and the saddle points separating them in the energy landscape
are known to dominate the dynamics of biopolymer folding. Here we introduce a
notion of a "folding funnel" that is concisely defined in terms of energy
minima and saddle points, while at the same time conforming to a notion of a
"folding funnel" as it is discussed in the protein folding literature.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 11:57:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Klemm",
"Konstantin",
""
],
[
"Flamm",
"Christoph",
""
],
[
"Stadler",
"Peter F.",
""
]
] |
0707.3720 | Adam Bzdak | A. Bialas, A. Bzdak | Wounded quarks and diquarks in high energy collisions | version to be published in Phys. Rev. C, minor changes, discussion
extended | Phys.Rev.C77:034908,2008 | 10.1103/PhysRevC.77.034908 | null | hep-ph | null | Particle production in Au-Au, Cu-Cu, d-Au and p-p collisions at 200 GeV c.m.
energy are analyzed in the wounded quark-diquark model. Existing data are well
reproduced. Emission functions of wounded and unwounded constituents are
determined. Implications for the collective evolution of the system are
discussed.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:13:11 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 21:05:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bialas",
"A.",
""
],
[
"Bzdak",
"A.",
""
]
] |
0707.3721 | Nemesio Matos Oliveira Neto | N M Oliveira-Neto, E M F Curado and M A Rego-Monteiro | A class of generalised Jordan-Schwinger maps | 13 pages, 4 figures | null | null | null | math-ph math.MP | null | In this article we introduce a class of generalisations of the
Jordan-Schwinger (JS) map which realises the recent proposed generalised sl(2)
(G-sl(2)) algebra via two independent Generalised Heisenberg Algebras (GHA).
Although the GHA and the G-sl(2) algebra exhibit more general algebraic
structures than the Heisenberg and sl(2) algebras, the generalised JS map
presents a compact and simple structure wich includes the standard JS map as a
particular case. Finally, since in the GHA there is a physical interpretation
in terms of composite particles, we will carry out this assertion in a manner
that the generalised sl(2) algebra could be related to composite particles with
angular momentum.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:13:15 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Oliveira-Neto",
"N M",
""
],
[
"Curado",
"E M F",
""
],
[
"Rego-Monteiro",
"M A",
""
]
] |
0707.3722 | A. Lobel | A. Lobel (Royal Observatory of Belgium) | SpectroWeb: An Interactive Graphical Database of Digital Stellar
Spectral Atlases | 6 pages, 3 figures. To appear in The Ultraviolet Universe: Stars from
Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August
2006, Prague, Czech Republic, p. 167. Eds. Ana I. Gomez de Castro and Martin
A. Barstow, Publ. of Univ. Complutense de Madrid. More information about
SpectroWeb at http://spectra.freeshell.org/spectroweb.html | null | null | null | astro-ph | null | SpectroWeb is an online maintained interactive graphical database of digital
spectral atlases of spectral standard stars at http://spectra.freeshell.org .
It is an efficient and user-friendly research tool for accurate analyses of
stellar spectra observed with large spectral resolution, including the solar
spectrum. The web-interface displays observed and theoretical stellar spectra,
and comprehensively provides detailed atomic and molecular line information via
user interaction. It fully integrates interactive spectrum visualization tools
for the analysis, management, and maintenance of large volumes of spectral
line-identification, -transition, and -property data. SpectroWeb 1.0 currently
offers optical (3300-6800 A) flux normalized high-resolution spectra of
Betelgeuse (M2), Arcturus (K1), The Sun (G2), Beta Aqr (G0), Procyon (F5), and
Canopus (F0). The provided line identifications are based on state of the art
spectrum synthesis calculations. The graphical database is under permanent
development as an online repository of identified (absorption) lines in
spectral standard reference stars, covering a broad range of stellar spectral
types. Its object-oriented (Java) implementation offers future expansion
capabilities to link and read stellar spectral atlases from various public
internet sites.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 13:00:08 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Lobel",
"A.",
"",
"Royal Observatory of Belgium"
]
] |
0707.3723 | Catherine Bourge | Francois Richard | Scenarios for ILC in 2010 | null | null | null | LAL 07-80 | hep-ph | null | Assuming that first significant results from LHC become available, this
presentation assumes 4 different scenarios and discuss the implications for ILC
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:29:17 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Richard",
"Francois",
""
]
] |
0707.3724 | N. D. Tracas | G. K. Leontaris (1), N. D. Tracas (2), N. D. Vlachos (3), O.
Korakianitis (2) ((1)Ioannina Univ., (2)Nat. Techn. Univ. Athens,
(3)Thessaloniki Univ.) | Towards a realistic Standard Model from D-brane configurations | 22 pages, 12 EPS figures, some clarifications/references added | Phys.Rev.D76:115009,2007 | 10.1103/PhysRevD.76.115009 | null | hep-ph | null | Effective low energy models arising in the context of D-brane configurations
with Standard Model (SM) gauge symmetry extended by several gauged abelian
factors are discussed. The models are classified according to their hypercharge
embeddings consistent with the SM spectrum hypercharge assignment. Particular
cases are analyzed according to their perspectives and viability as low energy
effective field theory candidates. The resulting string scale is determined by
means of a two-loop renormalization group calculation. Their implications in
Yukawa couplings, neutrinos and flavor changing processes are also presented.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:38:53 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 13:28:37 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Sep 2007 14:28:31 GMT"
},
{
"version": "v4",
"created": "Mon, 22 Oct 2007 13:00:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Leontaris",
"G. K.",
""
],
[
"Tracas",
"N. D.",
""
],
[
"Vlachos",
"N. D.",
""
],
[
"Korakianitis",
"O.",
""
]
] |
0707.3725 | Muriel Livernet | Fr\'ed\'eric Chapoton (ICJ), Muriel Livernet (LAGA) | Relating two Hopf algebras built from an operad | 21 pages, use graphics, 12 figures Version 2 : references added,
minor changes. This version has not been corrected after submission. The
final and corrected version will appear in IMRN and can be obtained from the
authors | International Mathematics Research Notices 2007 (2007) rnm131, 27
pages | 10.1093/imrn/rnm131 | null | math.RA math.CO | null | Starting from an operad, one can build a family of posets. From this family
of posets, one can define an incidence Hopf algebra. By another construction,
one can also build a group directly from the operad. We then consider its Hopf
algebra of functions. We prove that there exists a surjective morphism from the
latter Hopf algebra to the former one. This is illustrated by the case of an
operad built on rooted trees, the $\NAP$ operad, where the incidence Hopf
algebra is identified with the Connes-Kreimer Hopf algebra of rooted trees.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:40:41 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Oct 2007 08:43:34 GMT"
}
] | 2007-11-20T00:00:00 | [
[
"Chapoton",
"Frédéric",
"",
"ICJ"
],
[
"Livernet",
"Muriel",
"",
"LAGA"
]
] |
0707.3726 | A. Lobel | A. Lobel (1), R. Blomme (1) ((1) Royal Observatory of Belgium) | Three Dimensional Radiative Transfer in Winds of Massive Stars: Wind3D | 6 pages, 4 figures. To appear in The Ultraviolet Universe: Stars from
Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August
2006, Prague, Czech Republic, p. 119. Eds. Ana I. Gomez de Castro and Martin
A. Barstow, Publ. of Univ. Complutense de Madrid. More information about
Wind3D at http://alobel.freeshell.org/conference.html | null | null | null | astro-ph | null | We discuss the development of the new radiative transfer code Wind3D. It
solves the non-LTE radiative transport problem in moving stellar atmosphere
models in three geometric dimensions. The code accepts arbitrary 3D velocity
fields in Cartesian geometry without assumptions of axial symmetry. Wind3D is
currently implemented as a fully parallelized (exact) accelerated lambda
iteration scheme with a two level atom formulation. The numerical transfer
scheme is efficient and very accurate to trace small variations of local
velocity gradients on line opacity in strongly scattering dominated extended
stellar winds. We investigate the detailed formation of P Cygni line profiles
observed in ultraviolet spectra of massive stars. We compute the detailed shape
of these resonance lines to model local enhancements of line opacity that can
for instance be caused by clumping in supersonically expanding winds. Wind3D
will be applied to hydrodynamic models to investigate physical properties of
discrete absorption line components.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:41:53 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Lobel",
"A.",
"",
"Royal Observatory of Belgium"
],
[
"Blomme",
"R.",
"",
"Royal Observatory of Belgium"
]
] |
0707.3727 | Nathan Goldman | N. Goldman | Spatial patterns in optical lattices submitted to gauge potentials | 5 pages | Europhys. Lett. 80 20001 (2007) | 10.1209/0295-5075/80/20001 | null | cond-mat.mes-hall | null | We study the vortex formation in optical lattices submitted to artificial
gauge potentials. We compute the superfluid density for Abelian and non-Abelian
gauge potentials with a mean-field approach of the Bose-Hubbard model and we
determine the rule describing the number of vortices as a function of the
effective magnetic flux. This simple rule is represented by a remarkably rich
figure that represents the superfluid density as a function of the flux. The
phenomena which emanate from this work should be observed experimentally in
optical lattices within which atom tunneling is laser-assisted and described by
commutative or non-commutative tunneling operators.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:42:15 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 09:33:18 GMT"
}
] | 2007-12-17T00:00:00 | [
[
"Goldman",
"N.",
""
]
] |
0707.3728 | Michal Karpinski | Michal Karpinski, Czeslaw Radzewicz and Konrad Banaszek | Fiber-optic realization of anisotropic depolarizing quantum channels | 7 pages, 6 figures | J. Opt. Soc. Am. B 25, 668 (2008) | 10.1364/JOSAB.25.000668 | null | quant-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employed an electrically-driven polarization controller to implement
anisotropic depolarizing quantum channels for the polarization state of single
photons. The channels were characterized by means of ancilla-assisted quantum
process tomography using polarization-entangled photons generated in the
process of spontaneous parametric down-conversion. The demonstrated
depolarization method offers good repeatability, low cost, and compatibility
with fiber-optic setups. It does not perturb the modal structure of single
photons, and therefore can be used to verify experimentally protocols for
managing decoherence effects based on multiphoton interference.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:46:08 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Jul 2010 08:10:22 GMT"
}
] | 2010-07-22T00:00:00 | [
[
"Karpinski",
"Michal",
""
],
[
"Radzewicz",
"Czeslaw",
""
],
[
"Banaszek",
"Konrad",
""
]
] |
0707.3729 | Lasse Leskel\"{a} | Ingemar Kaj, Lasse Leskel\"a, Ilkka Norros, Volker Schmidt | Scaling limits for random fields with long-range dependence | Published at http://dx.doi.org/10.1214/009117906000000700 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Probability 2007, Vol. 35, No. 2, 528-550 | 10.1214/009117906000000700 | IMS-AOP-AOP0191 | math.PR | null | This paper studies the limits of a spatial random field generated by
uniformly scattered random sets, as the density $\lambda$ of the sets grows to
infinity and the mean volume $\rho$ of the sets tends to zero. Assuming that
the volume distribution has a regularly varying tail with infinite variance, we
show that the centered and renormalized random field can have three different
limits, depending on the relative speed at which $\lambda$ and $\rho$ are
scaled. If $\lambda$ grows much faster than $\rho$ shrinks, the limit is
Gaussian with long-range dependence, while in the opposite case, the limit is
independently scattered with infinite second moments. In a special intermediate
scaling regime, there exists a nontrivial limiting random field that is not
stable.
| [
{
"version": "v1",
"created": "Wed, 25 Jul 2007 12:52:42 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Kaj",
"Ingemar",
""
],
[
"Leskelä",
"Lasse",
""
],
[
"Norros",
"Ilkka",
""
],
[
"Schmidt",
"Volker",
""
]
] |
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