id
stringlengths 9
16
| submitter
stringlengths 1
64
⌀ | authors
stringlengths 3
36.7k
| title
stringlengths 1
382
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 1
557
⌀ | doi
stringlengths 7
153
⌀ | report-no
stringlengths 1
479
⌀ | categories
stringlengths 5
125
| license
stringclasses 9
values | abstract
stringlengths 6
6.09k
| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.3214 | Shinji Mukohyama | Shinji Mukohyama | Reheating a multi-throat universe by brane motion | 15 pages. v3: estimate of reheat temperature and reference added;
published version | null | 10.1007/s10714-008-0696-3 | UTAP-580, RESCEU-72/07 | hep-th astro-ph gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a mechanism of reheating after inflation in multi-throat scenarios
of warped extra dimensions. Validity of an effective field theory on the
standard model (SM) brane requires that the position of the SM brane during
inflation be different from the position after inflation. The latter is
supposed to be near the tip of the SM throat but the former is not. After
inflation, when the Hubble expansion rate becomes sufficiently low, the SM
brane starts moving towards the tip and eventually oscillates. The SM fields
are excited by the brane motion and the universe is reheated. Since interaction
between the brane position modulus and the SM fields is suppressed only by the
local string scale, the modulus effectively decays into the SM fields.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 19:46:46 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 02:52:11 GMT"
},
{
"version": "v3",
"created": "Sun, 5 Oct 2008 21:50:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mukohyama",
"Shinji",
""
]
] |
0706.3215 | Subir Sachdev | Sean A. Hartnoll, Pavel K. Kovtun, Markus Mueller, and Subir Sachdev | Theory of the Nernst effect near quantum phase transitions in condensed
matter, and in dyonic black holes | 44 pages, 4 figures; (v3) Added new subsection highlighting negative
Hall resistance at hole densities smaller than 1/8 | Phys.Rev.B76:144502,2007 | 10.1103/PhysRevB.76.144502 | null | cond-mat.str-el cond-mat.supr-con hep-th | null | We present a general hydrodynamic theory of transport in the vicinity of
superfluid-insulator transitions in two spatial dimensions described by
"Lorentz"-invariant quantum critical points. We allow for a weak impurity
scattering rate, a magnetic field B, and a deviation in the density, \rho, from
that of the insulator. We show that the frequency-dependent thermal and
electric linear response functions, including the Nernst coefficient, are fully
determined by a single transport coefficient (a universal electrical
conductivity), the impurity scattering rate, and a few thermodynamic state
variables. With reasonable estimates for the parameters, our results predict a
magnetic field and temperature dependence of the Nernst signal which resembles
measurements in the cuprates, including the overall magnitude. Our theory
predicts a "hydrodynamic cyclotron mode" which could be observable in ultrapure
samples. We also present exact results for the zero frequency transport
co-efficients of a supersymmetric conformal field theory (CFT), which is
solvable by the AdS/CFT correspondence. This correspondence maps the \rho and B
perturbations of the 2+1 dimensional CFT to electric and magnetic charges of a
black hole in the 3+1 dimensional anti-de Sitter space. These exact results are
found to be in full agreement with the general predictions of our hydrodynamic
analysis in the appropriate limiting regime. The mapping of the hydrodynamic
and AdS/CFT results under particle-vortex duality is also described.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:35:17 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Jun 2007 13:29:31 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Jul 2007 18:39:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hartnoll",
"Sean A.",
""
],
[
"Kovtun",
"Pavel K.",
""
],
[
"Mueller",
"Markus",
""
],
[
"Sachdev",
"Subir",
""
]
] |
0706.3216 | L. Jonathan Dursi | L. J. Dursi (CITA, University of Toronto) | Bubble-Wrap for Bullets: The Stability Imparted By A Thin Magnetic Layer | 20pp, 10 figures; ApJ in press. Please email any comments. v2: Typo
in Atwood number definition fixed, and resolution study mentioned. v3: As
accepted by ApJ | ApJ 670:221, Nov 20, 2007 | 10.1086/521997 | CITA-2007-7 | astro-ph physics.flu-dyn physics.plasm-ph | null | There has been significant recent work which examines a situation where a
thin magnetic layer is `draped' over a core merging into a larger cluster; the
same process also appears to be at work at a bubble rising from the cluster
centre. Such a thin magnetic layer could thermally isolate the core from the
cluster medium, but only if the same shear process which generates the layer
does not later disrupt it. On the other hand, if the magnetized layer can
stabilize against the shear instabilities, then the magnetic layer can have the
additional dynamical effect of reducing the shear-driven mixing of the core's
material during the merger process. These arguments could equally well to
underdense cluster bubbles, which would be even more prone to disruption. While
it is well known that magnetic fields can suppress instabilities, it is less
clear that a thin layer can suppress instabilities on scales significantly
larger than its thickness. Here we consider the stability imparted by a thin
magnetized layer. Such a layer can have a significant stabilizing effect even
on modes with wavelengths much larger than the thickness of the layer l; to
stabilize modes ten times larger requires only that the Alfv\'en speed in the
magnetized layer is comparable to the relevant destabilizing velocity -- the
shear velocity in the case of pure Kelvin-Helmholtz like instability, or a
typical buoyancy velocity in the case of pure Rayleigh-Taylor. We confirm our
calculations with two-dimensional numerical experiments using the Athena code.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 20:00:52 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Jun 2007 18:42:55 GMT"
},
{
"version": "v3",
"created": "Fri, 2 Nov 2007 21:53:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dursi",
"L. J.",
"",
"CITA, University of Toronto"
]
] |
0706.3217 | Daniel Oberlin | Daniel Oberlin | Convolution estimates and model surfaces of low codimension | 7 pages | null | null | null | math.CA | null | We give examples of measures on certain k-surfaces in R^d. These measures
satisfy convolution estimates which are nearly optimal.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 20:00:57 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Oberlin",
"Daniel",
""
]
] |
0706.3218 | Jennifer Taback | Matthew Horak, Melanie Stein and Jennifer Taback | Computing word length in alternate presentations of Thompson's group F | 28 pages, 13 figures | International Journal of Algebra and Computation 19, no. 08
(2009): 963-997 | 10.1142/S0218196709005445 | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new method for computing the word length of an element of
Thompson's group F with respect to a "consecutive" generating set of the form
X_n={x_0,x_1,...,x_n}, which is a subset of the standard infinite generating
set for F. We use this method to show that (F,X_n) is not almost convex, and
has pockets of increasing, though bounded, depth dependent on n.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:53:00 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Aug 2008 00:12:17 GMT"
}
] | 2021-09-24T00:00:00 | [
[
"Horak",
"Matthew",
""
],
[
"Stein",
"Melanie",
""
],
[
"Taback",
"Jennifer",
""
]
] |
0706.3219 | Andrei Kirilyuk | Andrei P. Kirilyuk | Universal Science of Complexity: Consistent Understanding of Ecological,
Living and Intelligent System Dynamics | 13 pages, 28 eqs, 15 refs; Invited talk at the International
Conference "Describing Complex Systems 2006" (Brijuni Islands, 12-14 June
2006), see http://decos.znanost.org; Russian translation is published in
Nanosystems, Nanomaterials, Nanotechnologies 11(4) (2013) 679-700, see
http://www.imp.kiev.ua/nanosys/en/articles/2013/4/nano_vol11_iss4_p0679p0700_2013_abstract.html | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A major challenge of interdisciplinary description of complex system
behaviour is whether real systems of higher complexity levels can be understood
with at least the same degree of objective, "scientific" rigour and
universality as "simple" systems of classical, Newtonian science paradigm. The
problem is reduced to that of arbitrary, many-body interaction (unsolved in
standard theory). Here we review its causally complete solution, the ensuing
concept of complexity and applications. The discovered key properties of
dynamic multivaluedness and entanglement give rise to a qualitatively new kind
of mathematical structure providing the exact version of real system behaviour.
The extended mathematics of complexity contains the truly universal definition
of dynamic complexity, randomness (chaoticity), classification of all possible
dynamic regimes, and the unifying principle of any system dynamics and
evolution, the universal symmetry of complexity. Every real system has a
non-zero (and actually high) value of unreduced dynamic complexity determining,
in particular, "mysterious" behaviour of quantum systems and relativistic
effects causally explained now as unified manifestations of complex interaction
dynamics. The observed differences between various systems are due to different
regimes and levels of their unreduced dynamic complexity. We outline
applications of universal concept of dynamic complexity emphasising cases of
"truly complex" systems from higher complexity levels (ecological and living
systems, brain operation, intelligence and consciousness, autonomic information
and communication systems) and show that the urgently needed progress in social
and intellectual structure of civilisation inevitably involves qualitative
transition to unreduced complexity understanding (we call it "revolution of
complexity").
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 20:30:05 GMT"
},
{
"version": "v2",
"created": "Mon, 26 May 2014 14:31:24 GMT"
}
] | 2014-05-27T00:00:00 | [
[
"Kirilyuk",
"Andrei P.",
""
]
] |
0706.3220 | Peter Adshead | Peter Adshead and Steven Furlanetto (Yale) | Reionization and the large-scale 21 cm-cosmic microwave background cross
correlation | 15 pages, 4 figures, submitted to MNRAS | MNRAS, 384, 291 (2008) | 10.1111/j.1365-2966.2007.12681.x | null | astro-ph | null | Of the many probes of reionization, the 21 cm line and the cosmic microwave
background (CMB) are among the most effective. We examine how the
cross-correlation of the 21 cm brightness and the CMB Doppler fluctuations on
large angular scales can be used to study this epoch. We employ a new model of
the growth of large scale fluctuations of the ionized fraction as reionization
proceeds. We take into account the peculiar velocity field of baryons and show
that its effect on the cross correlation can be interpreted as a mixing of
Fourier modes. We find that the cross-correlation signal is strongly peaked
toward the end of reionization and that the sign of the correlation should be
positive because of the inhomogeneity inherent to reionization. The signal
peaks at degree scales (l~100) and comes almost entirely from large physical
scales (k~0.01 Mpc). Since many of the foregrounds and noise that plague low
frequency radio observations will not correlate with CMB measurements, the
cross correlation might appear to provide a robust diagnostic of the
cosmological origin of the 21 cm radiation around the epoch of reionization.
Unfortunately, we show that these signals are actually only weakly correlated
and that cosmic variance dominates the error budget of any attempted detection.
We conclude that the detection of a cross-correlation peak at degree-size
angular scales is unlikely even with ideal experiments.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:08:28 GMT"
}
] | 2014-02-20T00:00:00 | [
[
"Adshead",
"Peter",
"",
"Yale"
],
[
"Furlanetto",
"Steven",
"",
"Yale"
]
] |
0706.3221 | Sergey Tsarev P. | A.I. Bobenko, S.P. Tsarev | Curvature line parametrization from circle patterns | LaTeX, 22 p., 7 EPS figures | null | null | null | math.DG | null | We study local and global approximations of smooth nets of curvature lines
and smooth conjugate nets by respective discrete nets (circular nets and planar
quadrilateral nets) with infinitesimal quads. It is shown that choosing the
points of discrete nets on the smooth surface one can obtain second-order
approximation globally. Also a simple geometric construction for approximate
determination of principal directions of smooth surfaces is given.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 20:52:28 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Bobenko",
"A. I.",
""
],
[
"Tsarev",
"S. P.",
""
]
] |
0706.3222 | Eilat Glikman | Eilat Glikman (1) David J. Helfand (2) Richard L. White (3) Robert H.
Becker (4,5) Michael D. Gregg (4,5) and Mark Lacy (6) ((1) Caltech, (2)
Columbia University, (3) STScI, (4) UC Davis, (5) IGPP-LLNL, (6) Spitzer
Science Center) | The FIRST-2MASS Red Quasar Survey | 80 pages (single-column, preprint format) 20 figures, Accepted for
publicated in ApJ | null | 10.1086/521073 | null | astro-ph | null | Combining radio observations with optical and infrared color selection --
demonstrated in our pilot study to be an efficient selection algorithm for
finding red quasars -- we have obtained optical and infrared spectroscopy for
120 objects in a complete sample of 156 candidates from a sky area of 2716
square degrees. Consistent with our initial results, we find our selection
criteria -- J-K>1.7, R-K>4.0 -- yield a ~50% success rate for discovering
quasars substantially redder than those found in optical surveys. Comparison
with UVX- and optical color-selected samples shows that >~ 10% of the quasars
are missed in a magnitude-limited survey. Simultaneous two-frequency radio
observations for part of the sample indicate that a synchrotron continuum
component is ruled out as a significant contributor to reddening the quasars'
spectra. We go on to estimate extinctions for our objects assuming their red
colors are caused by dust. Continuum fits and Balmer decrements suggest E(B-V)
values ranging from near zero to 2.5 magnitudes. Correcting the K-band
magnitudes for these extinctions, we find that for K <= 14.0, red quasars make
up between 25% and 60% of the underlying quasar population; owing to the
incompleteness of the 2MASS survey at fainter K-band magnitudes, we can only
set a lower limit to the radio-detected red quasar population of >20-30%.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:02:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Glikman",
"Eilat",
""
],
[
"Helfand",
"David J.",
""
],
[
"White",
"Richard L.",
""
],
[
"Becker",
"Robert H.",
""
],
[
"Gregg",
"Michael D.",
""
],
[
"Lacy",
"Mark",
""
]
] |
0706.3223 | Mahuya Datta | Mahuya Datta, Md. Rabiul Islam | Smooth maps of a foliated manifold in a symplectic manifold | 10 pages | Proceedings of the Indian Academy of Science, Mathematical
Sciences v 119, 2009. Pages 333-343 | null | null | math.DG math.AP | null | The immersions of a smooth manifold $M$ in a symplectic manifold $(N,\sigma)$
inducing a given closed form $\omega$ on $M$ satisfy the $C^0$-dense
$h$-principle in the space of all continuous maps which pull back the deRham
cohomology class of $\sigma$ onto that of $\omega$. In this paper we prove a
foliated version of this result due to Gromov.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:05:14 GMT"
}
] | 2010-09-28T00:00:00 | [
[
"Datta",
"Mahuya",
""
],
[
"Islam",
"Md. Rabiul",
""
]
] |
0706.3224 | Michael S Underwood | Michael S. Underwood, Karl-Peter Marzlin | Fermi-Frenet coordinates for space-like curves | 7 pages | Int.J.Mod.Phys.A25:1147-1154,2010 | 10.1142/S0217751X10047841 | null | gr-qc | null | We generalize Fermi coordinates, which correspond to an adapted set of
coordinates describing the vicinity of an observer's worldline, to the
worldsheet of an arbitrary spatial curve in a static spacetime. The spatial
coordinate axes are fixed using a covariant Frenet triad so that the metric can
be expressed using the curvature and torsion of the spatial curve. As an
application of Fermi-Frenet coordinates, we show that they allow covariant
inertial forces to be expressed in a simple and physically intuitive way.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:11:34 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 21:23:34 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Underwood",
"Michael S.",
""
],
[
"Marzlin",
"Karl-Peter",
""
]
] |
0706.3225 | Luciano da Fontoura Costa | F. A. Rodrigues, P. R. Villas Boas, G. Travieso and L. da F. Costa | Seeking the best Internet Model | 11 pages, 2 figures. A working manuscript, suggestions welcomed | null | null | null | physics.soc-ph | null | The models of the Internet reported in the literature are mainly aimed at
reproducing the scale-free structure, the high clustering coefficient and the
small world effects found in the real Internet, while other important
properties (e.g. related to centrality and hierarchical measurements) are not
considered. For a better characterization and modeling of such network, a
larger number of topological properties must be considered. In this work, we
present a sound multivariate statistical approach, including feature spaces and
multivariate statistical analysis (especially canonical projections), in order
to characterize several Internet models while considering a larger set of
relevant measurements. We apply such a methodology to determine, among nine
complex networks models, which are those most compatible with the real Internet
data (on the autonomous systems level) considering a set of 21 network
measurements. We conclude that none of the considered models can reproduce the
Internet topology with high accuracy.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:12:25 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 19:26:49 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Rodrigues",
"F. A.",
""
],
[
"Boas",
"P. R. Villas",
""
],
[
"Travieso",
"G.",
""
],
[
"Costa",
"L. da F.",
""
]
] |
0706.3226 | Stefan Forcey | Stefan Forcey | Convex Hull Realizations of the Multiplihedra | typos fixed, introduction revised | null | null | null | math.AT math.CO math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple algorithm for determining the extremal points in
Euclidean space whose convex hull is the nth polytope in the sequence known as
the multiplihedra. This answers the open question of whether the multiplihedra
could be realized as convex polytopes. We use this realization to unite the
approach to A_n-maps of Iwase and Mimura to that of Boardman and Vogt. We
include a review of the appearance of the nth multiplihedron for various n in
the studies of higher homotopy commutativity, (weak) n-categories,
A_infinity-categories, deformation theory, and moduli spaces. We also include
suggestions for the use of our realizations in some of these areas as well as
in related studies, including enriched category theory and the graph
associahedra.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 18:50:58 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 20:27:49 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Dec 2007 16:49:28 GMT"
},
{
"version": "v4",
"created": "Tue, 11 Mar 2008 20:53:52 GMT"
},
{
"version": "v5",
"created": "Tue, 25 Mar 2008 18:03:14 GMT"
},
{
"version": "v6",
"created": "Tue, 10 Jun 2008 20:47:37 GMT"
}
] | 2008-06-10T00:00:00 | [
[
"Forcey",
"Stefan",
""
]
] |
0706.3227 | Alberto Accardi | Alberto Accardi | Final state interactions and hadron quenching in cold nuclear matter | 14 pages, 7 figures | Phys.Rev.C76:034902,2007 | 10.1103/PhysRevC.76.034902 | null | nucl-th hep-ex hep-ph | null | I examine the role of final state interactions in cold nuclear matter in
modifying hadron production on nuclear targets with leptonic or hadronic beams.
I demonstrate the extent to which available experimental data in
electron-nucleus collisions can give direct information on final state effects
in hadron-nucleus and nucleus-nucleus collisions. For hadron-nucleus
collisions, a theoretical estimate based on a parton energy loss model tested
in lepton-nucleus collisions shows a large effect on mid-rapidity hadrons at
fixed target experiments. At RHIC energy, the effect is large for negative
rapidity hadrons, but mild at midrapidity. This final state cold hadron
quenching needs to be taken into account in jet tomographic analysis of the
medium created in nucleus-nucleus collisions.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:27:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Accardi",
"Alberto",
""
]
] |
0706.3228 | Christopher Herzog | Sean A. Hartnoll, Christopher P. Herzog | Ohm's Law at strong coupling: S duality and the cyclotron resonance | 23 pages, 11 figures, typos corrected and references added. Improved
discussion of S duality | Phys.Rev.D76:106012,2007 | 10.1103/PhysRevD.76.106012 | null | hep-th cond-mat.str-el | null | We calculate the electrical and thermal conductivities and the thermoelectric
coefficient of a class of strongly interacting 2+1 dimensional conformal field
theories with anti-de Sitter space duals. We obtain these transport
coefficients as a function of charge density, background magnetic field,
temperature and frequency. We show that the thermal conductivity and
thermoelectric coefficient are determined by the electrical conductivity alone.
At small frequency, in the hydrodynamic limit, we are able to provide a number
of analytic formulae for the electrical conductivity. A dominant feature of the
conductivity is the presence of a cyclotron pole. We show how bulk
electromagnetic duality acts on the transport coefficients.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 16:03:41 GMT"
},
{
"version": "v2",
"created": "Sat, 7 Jul 2007 12:21:32 GMT"
},
{
"version": "v3",
"created": "Thu, 18 Oct 2007 05:44:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hartnoll",
"Sean A.",
""
],
[
"Herzog",
"Christopher P.",
""
]
] |
0706.3229 | Bernardo Uribe Dr | Edward Becerra and Bernardo Uribe | Stringy product on twisted orbifold K-theory for abelian quotients | 23 pages. A chapter on the stringy product on twisted orbifold
K-theory has been added, including a decomposition formula and examples with
non trivial twisting. The title has been changed accordingly. To appear in
TAMS | null | null | null | math.AT math.AG | null | In this paper we present a model to calculate the stringy product on twisted
orbifold K-theory of Adem-Ruan-Zhang for abelian complex orbifolds.
In the first part we consider the non-twisted case on an orbifold presented
as the quotient of a manifold acted by a compact abelian Lie group. We give an
explicit description of the obstruction bundle, we explain the relation with
the product defined by Jarvis-Kaufmann-Kimura and, via a Chern character map,
with the Chen-Ruan cohomology, and we explicitely calculate the stringy product
for a weighted projective orbifold.
In the second part we consider orbifolds presented as the quotient of a
manifold acted by a finite abelian group and twistings coming from the group
cohomology. We show a decomposition formula for twisted orbifold K-theory that
is suited to calculate the stringy product and we use this formula to calculate
two examples when the group is $(\integer/2)^3$.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 21:45:15 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Dec 2007 16:17:36 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Feb 2008 16:52:28 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Becerra",
"Edward",
""
],
[
"Uribe",
"Bernardo",
""
]
] |
0706.3230 | Pak Yuen Chan | Pak Yuen Chan, Nigel Goldenfeld | Steady states and linear stability analysis of precipitation pattern
formation at geothermal hot springs | 12 pages, 6 figures | null | null | null | nlin.PS cond-mat.soft physics.geo-ph | null | A dynamical theory of geophysical precipitation pattern formation is
presented and applied to irreversible calcium carbonate (travertine)
deposition. Specific systems studied here are the terraces and domes observed
at geothermal hot springs, such as those at Yellowstone National Park, and
speleothems, particularly stalactites and stalagmites. The theory couples the
precipitation front dynamics with shallow water flow, including corrections for
turbulent drag and curvature effects. In the absence of capillarity and with a
laminar flow profile, the theory predicts a one-parameter family of steady
state solutions to the moving boundary problem describing the precipitation
front. These shapes match well the measured shapes near the vent at the top of
observed travertine domes. Closer to the base of the dome, the solutions
deviate from observations, and circular symmetry is broken by a fluting
pattern, which we show is associated with capillary forces causing thin film
break-up. We relate our model to that recently proposed for stalactite growth,
and calculate the linear stability spectrum of both travertine domes and
stalactites. Lastly, we apply the theory to the problem of precipitation
pattern formation arising from turbulent flow down an inclined plane, and
identify a linear instability that underlies scale-invariant travertine terrace
formation at geothermal hot springs.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 22:01:51 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 23:03:20 GMT"
}
] | 2007-08-23T00:00:00 | [
[
"Chan",
"Pak Yuen",
""
],
[
"Goldenfeld",
"Nigel",
""
]
] |
0706.3231 | Jan Ambjorn | Jan Ambjorn and Jens A. Gesser | World-sheet dynamics of ZZ branes | 14 pages | Phys.Lett.B653:439-444,2007 | 10.1016/j.physletb.2007.08.024 | null | hep-th | null | We show how non-compact space-time (ZZ branes) emerges as a limit of compact
space-time (FZZT branes) for specific ratios between the square of the boundary
cosmological constant and the bulk cosmological constant in the (2,2m-1)
minimal model coupled to two-dimensional quantum gravity.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 22:16:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ambjorn",
"Jan",
""
],
[
"Gesser",
"Jens A.",
""
]
] |
0706.3232 | Fernando Oscar Minotti | F. O. Minotti and E. Speranza | Asymptotic probability density functions in turbulence | 16 pages, no figures | null | null | null | physics.flu-dyn | null | A formalism is presented to obtain closed evolution equations for asymptotic
probability distribution functions of turbulence magnitudes. The formalism is
derived for a generic evolution equation, so that the final result can be
easily applied to rather general problems. Although the approximation involved
cannot be ascertained a priori, we show that application of the formalism to
well known problems gives the correct results.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 22:25:48 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Minotti",
"F. O.",
""
],
[
"Speranza",
"E.",
""
]
] |
0706.3233 | Hua Feng | Hua Feng, Philip Kaaret (Univ. of Iowa) | Origin of the X-ray Quasi-Periodic Oscillations and Identification of a
Transient Ultraluminous X-Ray Source in M82 | 9 pages, 6 figures, submitted to ApJ on May 08, 2007 | Astrophys. J. 668: 941-948, 2007 | 10.1086/521352 | null | astro-ph | null | The starburst galaxy M82 contains two ultraluminous X-ray sources (ULXs),
CXOM82 J095550.2+694047 (=X41.4+60) and CXOM82 J095551.1+694045 (=X42.3+59),
which are unresolved by XMM-Newton. We revisited the two XMM-Newton
observations of M82 and analyzed the surface brightness profiles using the
known Chandra source positions. We show that the quasi-periodic oscillations
(QPOs) detected with XMM-Newton originate from X41.4+60, the brightest X-ray
source in M82. Correcting for the contributions of the unresolved sources, the
QPO at a frequency of 55.8+/-1.3 mHz on 2001 May 06 had a fractional rms
amplitude of 32%, and the QPO at 112.9+/-1.3 mHz on 2004 April 21 had an
amplitude of 21%. The QPO frequency may possibly be correlated with the source
flux, similar to the type C QPOs in XTE 1550-564 and GRS 1915+105, but at
luminosities two orders of magnitude higher. X42.3+59, the second brightest
source in M82, displayed a strikingly high flux of 1.4E-11 ergs/cm^2/s in the
2-10 keV band on 2001 May 6. A seven-year light curve of X42.3+59 shows extreme
variability over a factor of 1000; the source is not detected in several
Chandra observations. This transient behavior suggests accretion from an
unstable disk. If the companion star is massive, as might be expected in the
young stellar environment, then the compact object would likely be an IMBH.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 22:41:27 GMT"
}
] | 2010-05-25T00:00:00 | [
[
"Feng",
"Hua",
"",
"Univ. of Iowa"
],
[
"Kaaret",
"Philip",
"",
"Univ. of Iowa"
]
] |
0706.3234 | Edgar Delgado-Eckert MS | Edgar Delgado-Eckert | Reverse engineering time discrete finite dynamical systems: A feasible
undertaking? | Submitted to journal, currently under review | PLoS ONE, 4(3), 2009 | 10.1371/journal.pone.0004939. | null | q-bio.QM math.DS q-bio.MN | null | With the advent of high-throughput profiling methods, interest in reverse
engineering the structure and dynamics of biochemical networks is high.
Recently an algorithm for reverse engineering of biochemical networks was
developed by Laubenbacher and Stigler. It is a top-down approach using time
discrete dynamical systems. One of its key steps includes the choice of a term
order. The aim of this paper is to identify minimal requirements on data sets
to be used with this algorithm and to characterize optimal data sets. We found
minimal requirements on a data set based on how many terms the functions to be
reverse engineered display. Furthermore, we identified optimal data sets, which
we characterized using a geometric property called "general position".
Moreover, we developed a constructive method to generate optimal data sets,
provided a codimensional condition is fulfilled. In addition, we present a
generalization of their algorithm that does not depend on the choice of a term
order. For this method we derived a formula for the probability of finding the
correct model, provided the data set used is optimal. We analyzed the
asymptotic behavior of the probability formula for a growing number of
variables n (i.e. interacting chemicals). Unfortunately, this formula converges
to zero as fast as r^(q^n), where q is a natural number and 0<r<1. Therefore,
even if an optimal data set is used and the restrictions in using term orders
are overcome, the reverse engineering problem remains unfeasible, unless
prodigious amounts of data are available. Such large data sets are
experimentally impossible to generate with today's technologies.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 22:52:50 GMT"
}
] | 2010-01-18T00:00:00 | [
[
"Delgado-Eckert",
"Edgar",
""
]
] |
0706.3235 | Swagato Banerjee | Swagato Banerjee, Bolek Pietrzyk, J. Michael Roney, Zbigniew Was | Tau and muon pair production cross-sections in electron-positron
annihilations at sqrt{s} = 10.58 GeV | 7 pages, 3 tables, 1 figure (published in Physical Review D 77,
054012 (2008)) | Phys.Rev.D77:054012,2008 | 10.1103/PhysRevD.77.054012 | null | hep-ph | null | The calculational precision of $\ee\to\tautau$ and $\ee\to\mumu$ production
cross-sections in electron-positron annihilations at \roots = 10.58 \gev are
studied for the \kk Monte Carlo simulation program. We determine
$\sigma(\ee\to\tautau) = (0.919 \pm 0.003) \nb$ and $\sigma(\ee\to\mumu) =
(1.147 \pm 0.005) \nb$, where the error represents the precision of the
calculation.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 19:33:53 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Mar 2008 22:16:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Banerjee",
"Swagato",
""
],
[
"Pietrzyk",
"Bolek",
""
],
[
"Roney",
"J. Michael",
""
],
[
"Was",
"Zbigniew",
""
]
] |
0706.3236 | Segev BenZvi | S.Y. BenZvi, F. Arqueros, R. Cester, M. Chiosso, B.M. Connolly, B.
Fick, A. Filipcic, B. Garc\'ia, A. Grillo, F. Guarino, M. Horvat, M. Iarlori,
C. Macolino, M. Malek, J. Matthews, J.A.J. Matthews, D. Melo, R. Meyhandan,
M. Micheletti, M. Monasor, M. Mostaf\'a, R. Mussa, J. Pallotta, S. Petrera,
M. Prouza, V. Rizi, M. Roberts, J.R. Rodriguez Rojo, D. Rodr\'iguez-Fr\'ias,
F. Salamida, M. Santander, G. Sequeiros, P. Sommers, A. Tonachini, L. Valore,
D. Verberic, E. Visbal, S. Westerhoff, L. Wiencke, D. Zavrtanik, M. Zavrtanik
(for the Pierre Auger Collaboration) | Measurement of Aerosols at the Pierre Auger Observatory | Contribution to the 30th International Cosmic Ray Conference, Merida
Mexico, July 2007; 4 pages, 4 figures | null | null | null | astro-ph | null | The air fluorescence detectors (FDs) of the Pierre Auger Observatory are
vital for the determination of the air shower energy scale. To compensate for
variations in atmospheric conditions that affect the energy measurement, the
Observatory operates an array of monitoring instruments to record hourly
atmospheric conditions across the detector site, an area exceeding 3,000 square
km. This paper presents results from four instruments used to characterize the
aerosol component of the atmosphere: the Central Laser Facility (CLF), which
provides the FDs with calibrated laser shots; the scanning backscatter lidars,
which operate at three FD sites; the Aerosol Phase Function monitors (APFs),
which measure the aerosol scattering cross section at two FD locations; and the
Horizontal Attenuation Monitor (HAM), which measures the wavelength dependence
of aerosol attenuation.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 23:02:05 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"BenZvi",
"S. Y.",
"",
"for the Pierre Auger Collaboration"
],
[
"Arqueros",
"F.",
"",
"for the Pierre Auger Collaboration"
],
[
"Cester",
"R.",
"",
"for the Pierre Auger Collaboration"
],
[
"Chiosso",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Connolly",
"B. M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Fick",
"B.",
"",
"for the Pierre Auger Collaboration"
],
[
"Filipcic",
"A.",
"",
"for the Pierre Auger Collaboration"
],
[
"García",
"B.",
"",
"for the Pierre Auger Collaboration"
],
[
"Grillo",
"A.",
"",
"for the Pierre Auger Collaboration"
],
[
"Guarino",
"F.",
"",
"for the Pierre Auger Collaboration"
],
[
"Horvat",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Iarlori",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Macolino",
"C.",
"",
"for the Pierre Auger Collaboration"
],
[
"Malek",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Matthews",
"J.",
"",
"for the Pierre Auger Collaboration"
],
[
"Matthews",
"J. A. J.",
"",
"for the Pierre Auger Collaboration"
],
[
"Melo",
"D.",
"",
"for the Pierre Auger Collaboration"
],
[
"Meyhandan",
"R.",
"",
"for the Pierre Auger Collaboration"
],
[
"Micheletti",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Monasor",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Mostafá",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Mussa",
"R.",
"",
"for the Pierre Auger Collaboration"
],
[
"Pallotta",
"J.",
"",
"for the Pierre Auger Collaboration"
],
[
"Petrera",
"S.",
"",
"for the Pierre Auger Collaboration"
],
[
"Prouza",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Rizi",
"V.",
"",
"for the Pierre Auger Collaboration"
],
[
"Roberts",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Rojo",
"J. R. Rodriguez",
"",
"for the Pierre Auger Collaboration"
],
[
"Rodríguez-Frías",
"D.",
"",
"for the Pierre Auger Collaboration"
],
[
"Salamida",
"F.",
"",
"for the Pierre Auger Collaboration"
],
[
"Santander",
"M.",
"",
"for the Pierre Auger Collaboration"
],
[
"Sequeiros",
"G.",
"",
"for the Pierre Auger Collaboration"
],
[
"Sommers",
"P.",
"",
"for the Pierre Auger Collaboration"
],
[
"Tonachini",
"A.",
"",
"for the Pierre Auger Collaboration"
],
[
"Valore",
"L.",
"",
"for the Pierre Auger Collaboration"
],
[
"Verberic",
"D.",
"",
"for the Pierre Auger Collaboration"
],
[
"Visbal",
"E.",
"",
"for the Pierre Auger Collaboration"
],
[
"Westerhoff",
"S.",
"",
"for the Pierre Auger Collaboration"
],
[
"Wiencke",
"L.",
"",
"for the Pierre Auger Collaboration"
],
[
"Zavrtanik",
"D.",
"",
"for the Pierre Auger Collaboration"
],
[
"Zavrtanik",
"M.",
"",
"for the Pierre Auger Collaboration"
]
] |
0706.3237 | KiHyun Yun | Mikyoung Lim, KiHyun Yun | Blow-up of Electric Fields between Closely Spaced Spherical Perfect
Conductors | Prof. Mikyoung Lim is added as an auther to the revison, 27 pages | null | null | null | math.AP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electric field increases toward infinity in the narrow region between
closely adjacent perfect conductors as they approach each other. Much attention
has been devoted to the blow-up estimate, especially in two dimensions, for the
practical relevance to high stress concentration in fiber-reinforced elastic
composites. In this paper, we establish optimal estimates for the electric
field associated with the distance between two spherical conductors in
$n-${dimensional spaces for $n \geq 2$}. {The novelty of these estimates is
that they explicitly describe the dependency of the blow-up rate on the
geometric parameters: the radii of the conductors.}
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 23:07:27 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Jun 2007 21:34:12 GMT"
},
{
"version": "v3",
"created": "Fri, 29 Jun 2007 19:52:26 GMT"
},
{
"version": "v4",
"created": "Sun, 1 Jul 2007 05:17:17 GMT"
},
{
"version": "v5",
"created": "Mon, 1 Sep 2008 05:28:27 GMT"
}
] | 2008-09-01T00:00:00 | [
[
"Lim",
"Mikyoung",
""
],
[
"Yun",
"KiHyun",
""
]
] |
0706.3238 | Hamilton | A. J. S. Hamilton (JILA, U. Colorado) | Perturbation theory of spherically symmetric self-similar black holes | 63 pages, 1 eps figure | null | null | null | gr-qc astro-ph | null | The theory of perturbations of spherically symmetric self-similar black holes
is presented, in the Newman-Penrose formalism. It is shown that the wave
equations for gravitational, electromagnetic, and scalar waves are separable,
though not decoupled. A generalization of the Teukolsky equation is given.
Monopole and dipole modes are treated. The Newman-Penrose wave equations
governing polar and axial spin-0 perturbations are explored.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 19:40:33 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 20:01:11 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Hamilton",
"A. J. S.",
"",
"JILA, U. Colorado"
]
] |
0706.3239 | Stephen D. H. Hsu | Stephen D.H. Hsu, David Reeb | Black hole entropy, curved space and monsters | 5 pages, revtex. Final version to appear Physics Letters B | Phys.Lett.B658:244-248,2008 | 10.1016/j.physletb.2007.09.021 | null | hep-th gr-qc hep-ph | null | We investigate the microscopic origin of black hole entropy, in particular
the gap between the maximum entropy of ordinary matter and that of black holes.
Using curved space, we construct configurations with entropy greater than their
area in Planck units. These configurations have pathological properties and we
refer to them as monsters. When monsters are excluded we recover the entropy
bound on ordinary matter $S < A^{3/4}$. This bound implies that essentially all
of the microstates of a semiclassical black hole are associated with the growth
of a slightly smaller black hole which absorbs some additional energy. Our
results suggest that the area entropy of black holes is the logarithm of the
number of distinct ways in which one can form the black hole from ordinary
matter and smaller black holes, but only after the exclusion of monster states.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 23:50:06 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Oct 2007 21:10:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hsu",
"Stephen D. H.",
""
],
[
"Reeb",
"David",
""
]
] |
0706.3240 | Vladimir Litvinov | V.I. Litvinov | Spin current and electrical polarization in GaN double-barrier
structures | 13 pages, 6 figures | null | 10.1103/PhysRevB.76.245305 | null | cond-mat.other | null | Tunnel spin polarization in a piezoelectric AlGaN/GaN double barrier
structure is calculated. It is shown that the piezoelectric field and the
spontaneous electrical polarization increase an efficiency of the tunnel spin
injection. The relation between the electrical polarization and the spin
orientation allows engineering a zero magnetic field spin injection
manipulating the lattice-mismatch strain with an Al-content in the barriers.
| [
{
"version": "v1",
"created": "Thu, 21 Jun 2007 23:57:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Litvinov",
"V. I.",
""
]
] |
0706.3241 | Daijiro Suematsu | Daijiro Suematsu | Phenomenological features in a model with non-universal gaugino CP
phases | 25 pages, 4 figures, accepted for publication in EPJC | Eur.Phys.J.C52:211-221,2007 | 10.1140/epjc/s10052-007-0362-z | KANAZAWA-07-08 | hep-ph | null | We study phenomenological features in an extended gauge mediation SUSY
breaking model which has non-universal gaugino masses and CP phases. We show
that large CP phases in soft SUSY breaking parameters can be consistent with
the constraints coming from the electric dipole moment (EDM) of an electron, a
neutron, and also a mercury atom. Masses of the superpartners are not
necessarily required to be larger than 1 TeV but allowed to be O(100) GeV. We
also investigate the mass spectrum of Higgs scalars and their couplings to
gauge bosons in that case. Compatibility of this model with the present
experimental data on the Higgs sector is discussed.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:18:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Suematsu",
"Daijiro",
""
]
] |
0706.3242 | Maciej Zworski | Stephane Nonnenmacher and Maciej Zworski | Quantum decay rates in chaotic scattering | 73 pages, 5 figures | null | null | null | math-ph math.MP math.SP | null | In this article we prove that for a large class of operators, including
Schroedinger operators, with hyperbolic classical flows, the smallness of
dimension of the trapped set implies that there is a gap between the resonances
and the real axis. In other words, the quantum decay rate is bounded from below
if the classical repeller is sufficiently filamentary. The higher dimensional
statement is given in terms of the topological pressure. Under the same
assumptions we also prove a resolvent estimate with a logarithmic loss compared
to nontrapping estimates.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:20:14 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 20:34:30 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Nonnenmacher",
"Stephane",
""
],
[
"Zworski",
"Maciej",
""
]
] |
0706.3243 | Chun-Yuan Gao | Chang-Qun Ma and Chun-Yuan Gao | Quark deconfinement in neutron star cores and the ground state of
neutral matter | 13 pages, 4 figures | Eur.Phys.J.A34:153-160,2007 | 10.1140/epja/i2007-10497-y | null | astro-ph | null | Whether or not deconfined quark phase exists in neutron star cores and
represents the ground state of neutral matter at moderate densities are open
questions. We use two realistic effective quark models, the three-flavor
Nambu-Jona-Lasinio model and the modified quark-meson coupling model, to
describe the neutron star matter. After constructing possible hybrid equations
of state (EOSes) with unpaired or color superconducting quark phase, we
systematically discuss the observational constraints of neutron stars on the
EOSes. It is found that the neutron star with pure quark matter core is
unstable and the hadronic phase with hyperons is denied, while hybrid EOSes
with two-flavor color superconducting phase or unpaired quark matter phase are
both allowed by the tight and most reliable constraints from two stars Ter 5 I
and EXO 0748-676. And the hybrid EOS with unpaired quark matter phase is
allowed even compared with the tightest constraint from the most massive pulsar
star PSR J0751+1807. Therefore, we conclude that the ground state of neutral
matter at moderate densities is in deconfined quark phase likely.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:28:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ma",
"Chang-Qun",
""
],
[
"Gao",
"Chun-Yuan",
""
]
] |
0706.3244 | Jun Nishimura | J. Nishimura, W. Bietenholz, Y. Susaki, J. Volkholz | A non-perturbative study of non-commutative U(1) gauge theory | 7 pages, 4 figures, Talk presented by J. Nishimura at the 21st
Nishinomiya-Yukawa Memorial Symposium on Theoretical Physics:
``Noncommutative Geometry and Quantum Spacetime in Physics'', Nishinomiya and
Kyoto (2006) | null | 10.1143/PTPS.171.178 | null | hep-th hep-lat | null | We study U(1) gauge theory on a 4d non-commutative torus, where two
directions are non-commutative. Monte Carlo simulations are performed after
mapping the regularized theory onto a U(N) lattice gauge theory in d=2. At
intermediate coupling strength, we find a phase in which open Wilson lines
acquire non-zero vacuum expectation values, which implies the spontaneous
breakdown of translational invariance. In this phase, various physical
quantities obey clear scaling behaviors in the continuum limit with a fixed
non-commutativity parameter theta, which provides evidence for a possible
continuum theory. In the weak coupling symmetric phase, the dispersion relation
involves a negative IR-singular term, which is responsible for the observed
phase transition.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:39:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nishimura",
"J.",
""
],
[
"Bietenholz",
"W.",
""
],
[
"Susaki",
"Y.",
""
],
[
"Volkholz",
"J.",
""
]
] |
0706.3245 | Yu-Xiao Liu | Yu-Xiao Liu, Zhen-Hua Zhao, Jie Yang, Yi-Shi Duan | The total energy-momentum of the universe in teleparallel gravity | 14 pages, no figures, V2: 13 pages, section II reorganized | null | null | null | gr-qc | null | We investigate the conservation law of energy-momentum in teleparallel
gravity by using general Noether theorem. The energy-momentum current has also
superpotential and is therefore identically conserved. The total
energy-momentum, which includes the contributions of both matter and
gravitational fields, is given by the integral of scalar densities over a
three-dimensional spacelike hypersurface. As an example, the universe in
teleparallel gravity is investigated. It is shown that the total
energy-momentum vanishes independently of both the curvature parameter and the
three dimensionless coupling constants of teleparallel gravity.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:42:03 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Aug 2007 10:31:35 GMT"
}
] | 2007-08-27T00:00:00 | [
[
"Liu",
"Yu-Xiao",
""
],
[
"Zhao",
"Zhen-Hua",
""
],
[
"Yang",
"Jie",
""
],
[
"Duan",
"Yi-Shi",
""
]
] |
0706.3246 | Balazs Szegedy | Karoly Podoski, Balazs Szegedy | On finite groups whose derived subgroup has bounded rank | null | null | null | null | math.GR | null | Let $G$ be a finite group with derived subgroup of rank $r$. We prove that
$\gzz\leq |G'|^{2r}$. Motivated by the results of I. M. Isaacs in \cite{isa} we
show that if $G$ is capable then $\gz\leq |G'|^{4r}$. This answers a question
of L. Pyber. We prove that if $G$ is a capable $p$-group then the rank of
$G/\mathbf{Z}(G)$ is bounded above in terms of the rank of $G'$.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 01:43:58 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Podoski",
"Karoly",
""
],
[
"Szegedy",
"Balazs",
""
]
] |
0706.3247 | Alma Wilson | Alma Teao Wilson | Relativistic rapidity as change in musical pitch | null | null | null | null | physics.gen-ph | null | Relativistic rapidity is usually presented as a computational device. As
Levy-Leblond has shown, it is also the velocity that would be imputed by an
ideal Newtonian inertial guidance system, taking c=1*neper=1. Here, we show
that it can also be interpreted as the change in musical pitch of radiation
fore and aft along the direction of motion.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 02:07:23 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Wilson",
"Alma Teao",
""
]
] |
0706.3248 | Katsunobu Oide | T. Abe, K. Akai, M. Akemoto, A. Akiyama, M. Arinaga, K. Ebihara, K.
Egawa, A. Enomoto, J. Flanagan, S. Fukuda, H. Fukuma, Y. Funakoshi, K.
Furukawa, T. Furuya, K. Hara, T. Higo, S. Hiramatsu, H. Hisamatsu, H. Honma,
T. Honma, K. Hosoyama, T. Ieiri, N. Iida, H. Ikeda, M. Ikeda, S. Inagaki, S.
Isagawa, H. Ishii, A. Kabe, E. Kadokura, T. Kageyama, K. Kakihara, E. Kako,
S. Kamada, T. Kamitani, K. Kanazawa, H. Katagiri, S. Kato, T. Kawamoto, S.
Kazakov, M. Kikuchi, E. Kikutani, K. Kitagawa, H. Koiso, Y. Kojima, I.
Komada, T. Kubo, K. Kudo, N. Kudo, K. Marutsuka, M. Masuzawa, S. Matsumoto,
T. Matsumoto, S. Michizono, K. Mikawa, T. Mimashi, S. Mitsunobu, K. Mori, A.
Morita, Y. Morita, H. Nakai, H. Nakajima, T. T. Nakamura, H. Nakanishi, K.
Nakanishi, K. Nakao, S. Ninomiya, Y. Ogawa, K. Ohmi, S. Ohsawa, Y. Ohsawa, Y.
Ohnishi, N. Ohuchi, K. Oide, M. Ono, T. Ozaki, K. Saito, H. Sakai, Y.
Sakamoto, M. Sato, M. Satoh, K. Shibata, T. Shidara, M. Shirai, A. Shirakawa,
T. Sueno, M. Suetake, Y. Suetsugu, R. Sugahara, T. Sugimura, T. Suwada, O.
Tajima, S. Takano, S. Takasaki, T. Takenaka, Y. Takeuchi, M. Tawada, M.
Tejima, M. Tobiyama, N. Tokuda, S. Uehara, S. Uno, Y. Yamamoto, Y. Yano, K.
Yokoyama, Ma. Yoshida, Mi. Yoshida, S. Yoshimoto, K. Yoshino, KEK, Oho,
Tsukuba, (Ibaraki, Japan) E. Perevedentsev, D. N. Shatilov, BINP,
(Novosibirsk, Russia) | Compensation of the Crossing Angle with Crab Cavities at KEKB | Submitted to Particle Accelerator Conference 2007, MOZAKI01,
Albuquerque | Conf.Proc.C070625:27,2007 | null | null | physics.ins-det | null | Crab cavities have been installed in the KEKB B--Factory rings to compensate
the crossing angle at the collision point and thus increase luminosity. The
beam operation with crab crossing has been done since February 2007. This is
the first experience with such cavities in colliders or storage rings. The crab
cavities have been working without serious issues. While higher specific
luminosity than the geometrical gain has been achieved, further study is
necessary and under way to reach the prediction of simulation.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 02:35:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Abe",
"T.",
""
],
[
"Akai",
"K.",
""
],
[
"Akemoto",
"M.",
""
],
[
"Akiyama",
"A.",
""
],
[
"Arinaga",
"M.",
""
],
[
"Ebihara",
"K.",
""
],
[
"Egawa",
"K.",
""
],
[
"Enomoto",
"A.",
""
],
[
"Flanagan",
"J.",
""
],
[
"Fukuda",
"S.",
""
],
[
"Fukuma",
"H.",
""
],
[
"Funakoshi",
"Y.",
""
],
[
"Furukawa",
"K.",
""
],
[
"Furuya",
"T.",
""
],
[
"Hara",
"K.",
""
],
[
"Higo",
"T.",
""
],
[
"Hiramatsu",
"S.",
""
],
[
"Hisamatsu",
"H.",
""
],
[
"Honma",
"H.",
""
],
[
"Honma",
"T.",
""
],
[
"Hosoyama",
"K.",
""
],
[
"Ieiri",
"T.",
""
],
[
"Iida",
"N.",
""
],
[
"Ikeda",
"H.",
""
],
[
"Ikeda",
"M.",
""
],
[
"Inagaki",
"S.",
""
],
[
"Isagawa",
"S.",
""
],
[
"Ishii",
"H.",
""
],
[
"Kabe",
"A.",
""
],
[
"Kadokura",
"E.",
""
],
[
"Kageyama",
"T.",
""
],
[
"Kakihara",
"K.",
""
],
[
"Kako",
"E.",
""
],
[
"Kamada",
"S.",
""
],
[
"Kamitani",
"T.",
""
],
[
"Kanazawa",
"K.",
""
],
[
"Katagiri",
"H.",
""
],
[
"Kato",
"S.",
""
],
[
"Kawamoto",
"T.",
""
],
[
"Kazakov",
"S.",
""
],
[
"Kikuchi",
"M.",
""
],
[
"Kikutani",
"E.",
""
],
[
"Kitagawa",
"K.",
""
],
[
"Koiso",
"H.",
""
],
[
"Kojima",
"Y.",
""
],
[
"Komada",
"I.",
""
],
[
"Kubo",
"T.",
""
],
[
"Kudo",
"K.",
""
],
[
"Kudo",
"N.",
""
],
[
"Marutsuka",
"K.",
""
],
[
"Masuzawa",
"M.",
""
],
[
"Matsumoto",
"S.",
""
],
[
"Matsumoto",
"T.",
""
],
[
"Michizono",
"S.",
""
],
[
"Mikawa",
"K.",
""
],
[
"Mimashi",
"T.",
""
],
[
"Mitsunobu",
"S.",
""
],
[
"Mori",
"K.",
""
],
[
"Morita",
"A.",
""
],
[
"Morita",
"Y.",
""
],
[
"Nakai",
"H.",
""
],
[
"Nakajima",
"H.",
""
],
[
"Nakamura",
"T. T.",
""
],
[
"Nakanishi",
"H.",
""
],
[
"Nakanishi",
"K.",
""
],
[
"Nakao",
"K.",
""
],
[
"Ninomiya",
"S.",
""
],
[
"Ogawa",
"Y.",
""
],
[
"Ohmi",
"K.",
""
],
[
"Ohsawa",
"S.",
""
],
[
"Ohsawa",
"Y.",
""
],
[
"Ohnishi",
"Y.",
""
],
[
"Ohuchi",
"N.",
""
],
[
"Oide",
"K.",
""
],
[
"Ono",
"M.",
""
],
[
"Ozaki",
"T.",
""
],
[
"Saito",
"K.",
""
],
[
"Sakai",
"H.",
""
],
[
"Sakamoto",
"Y.",
""
],
[
"Sato",
"M.",
""
],
[
"Satoh",
"M.",
""
],
[
"Shibata",
"K.",
""
],
[
"Shidara",
"T.",
""
],
[
"Shirai",
"M.",
""
],
[
"Shirakawa",
"A.",
""
],
[
"Sueno",
"T.",
""
],
[
"Suetake",
"M.",
""
],
[
"Suetsugu",
"Y.",
""
],
[
"Sugahara",
"R.",
""
],
[
"Sugimura",
"T.",
""
],
[
"Suwada",
"T.",
""
],
[
"Tajima",
"O.",
""
],
[
"Takano",
"S.",
""
],
[
"Takasaki",
"S.",
""
],
[
"Takenaka",
"T.",
""
],
[
"Takeuchi",
"Y.",
""
],
[
"Tawada",
"M.",
""
],
[
"Tejima",
"M.",
""
],
[
"Tobiyama",
"M.",
""
],
[
"Tokuda",
"N.",
""
],
[
"Uehara",
"S.",
""
],
[
"Uno",
"S.",
""
],
[
"Yamamoto",
"Y.",
""
],
[
"Yano",
"Y.",
""
],
[
"Yokoyama",
"K.",
""
],
[
"Yoshida",
"Ma.",
""
],
[
"Yoshida",
"Mi.",
""
],
[
"Yoshimoto",
"S.",
""
],
[
"Yoshino",
"K.",
""
],
[
"KEK",
"",
""
],
[
"Oho",
"",
""
],
[
"Tsukuba",
"",
""
],
[
"Perevedentsev",
"E.",
""
],
[
"Shatilov",
"D. N.",
""
],
[
"BINP",
"",
""
]
] |
0706.3249 | Stephanie van Willigenburg | Kristin M. Shaw and Stephanie van Willigenburg | Multiplicity free expansions of Schur $P$-functions | 10 pages | Ann. Comb. 11:69--77 (2007) | null | null | math.CO | null | After deriving inequalities on coefficients arising in the expansion of a
Schur $P$-function in terms of Schur functions we give criteria for when such
expansions are multiplicity free. From here we study the multiplicity of an
irreducible spin character of the twisted symmetric group in the product of a
basic spin character with an irreducible character of the symmetric group, and
determine when it is multiplicity free.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 02:41:26 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Shaw",
"Kristin M.",
""
],
[
"van Willigenburg",
"Stephanie",
""
]
] |
0706.3250 | Stephanie van Willigenburg | Hugh Thomas and Stephanie van Willigenburg | Compact symmetric solutions to the postage stamp problem | 6 pages, final version to appear in FJMS | FJMS 30:55--63 (2008) | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive lower and upper bounds on possible growth rates of certain sets of
positive integers $A_k=\{1= a_1 < a_2 < ... < a_{k}\}$ such that all integers
$n\in \{0, 1, 2, ..., ka_{k}\}$ can be represented as a sum of no more than $k$
elements of $A_k$, with repetition.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 02:48:40 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Oct 2008 17:09:04 GMT"
}
] | 2014-01-30T00:00:00 | [
[
"Thomas",
"Hugh",
""
],
[
"van Willigenburg",
"Stephanie",
""
]
] |
0706.3251 | Stephanie van Willigenburg | Kevin Purbhoo and Stephanie van Willigenburg | On tensor products of polynomial representations | 9 pages; final version to appear in Canad. Math. Bull | Can. Math. Bull. 51 (2008) 584-592 | 10.4153/CMB-2008-058-x | null | math.CO | null | We determine the necessary and sufficient combinatorial conditions for which
the tensor product of two irreducible polynomial representations of
$GL(n,\mathbb{C})$ is isomorphic to another. As a consequence we discover
families of Littlewood-Richardson coefficients that are non-zero, and a
condition on Schur non-negativity.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 02:58:49 GMT"
}
] | 2019-08-15T00:00:00 | [
[
"Purbhoo",
"Kevin",
""
],
[
"van Willigenburg",
"Stephanie",
""
]
] |
0706.3252 | Jian-Sheng Wang | Jian-Sheng Wang | Quantum thermal transport from classical molecular dynamics | 4 pages with 2 figures | Phys. Rev. Lett. 99, 160601 (2007) | 10.1103/PhysRevLett.99.160601 | null | cond-mat.stat-mech | null | Using a generalized Langevin equation of motion, quantum ballistic thermal
transport is obtained from classical molecular dynamics. This is possible
because the heat baths are represented by random noises obeying quantum
Bose-Einstein statistics. The numerical method gives asymptotically exact
results in both the low-temperature ballistic transport regime and
high-temperature strongly nonlinear classical regime. The method can be thought
of as a semi-classical approximation to the quantum transport problem. A
one-dimensional quartic on-site model is used to demonstrate the crossover from
ballistic to diffusive thermal transport.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 02:59:09 GMT"
}
] | 2007-10-16T00:00:00 | [
[
"Wang",
"Jian-Sheng",
""
]
] |
0706.3253 | Stephanie van Willigenburg | Ronald C. King, Trevor A. Welsh and Stephanie J. van Willigenburg | Schur positivity of skew Schur function differences and applications to
ribbons and Schubert classes | 30 pages; final version to appear in Journal of Algebraic
Combinatorics, Manfred Schocker Memorial Volume | J. Algebraic Combin. 28:139--167 (2008), volume in memory of M
Schocker | null | null | math.CO | null | Some new relations on skew Schur function differences are established both
combinatorially using Sch\"utzenberger's jeu de taquin, and algebraically using
Jacobi-Trudi determinants. These relations lead to the conclusion that certain
differences of skew Schur functions are Schur positive. Applying these results
to a basis of symmetric functions involving ribbon Schur functions confirms the
validity of a Schur positivity conjecture due to McNamara. A further
application reveals that certain differences of products of Schubert classes
are Schubert positive.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:10:43 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 19:58:57 GMT"
}
] | 2014-01-30T00:00:00 | [
[
"King",
"Ronald C.",
""
],
[
"Welsh",
"Trevor A.",
""
],
[
"van Willigenburg",
"Stephanie J.",
""
]
] |
0706.3254 | Marcos Rigol Madrazo | Marcos Rigol, Tyler Bryant, Rajiv R. P. Singh | Numerical Linked-Cluster Algorithms. I. Spin systems on square,
triangular, and kagome lattices | 14 pages, 16 figures, as published | Phys. Rev. E 75, 061118 (2007) | 10.1103/PhysRevE.75.061118 | null | cond-mat.stat-mech cond-mat.str-el | null | We discuss recently introduced numerical linked-cluster (NLC) algorithms that
allow one to obtain temperature-dependent properties of quantum lattice models,
in the thermodynamic limit, from exact diagonalization of finite clusters. We
present studies of thermodynamic observables for spin models on square,
triangular, and kagome lattices. Results for several choices of clusters and
extrapolations methods, that accelerate the convergence of NLC, are presented.
We also include a comparison of NLC results with those obtained from exact
analytical expressions (where available), high-temperature expansions (HTE),
exact diagonalization (ED) of finite periodic systems, and quantum Monte Carlo
simulations.For many models and properties NLC results are substantially more
accurate than HTE and ED.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:39:11 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Rigol",
"Marcos",
""
],
[
"Bryant",
"Tyler",
""
],
[
"Singh",
"Rajiv R. P.",
""
]
] |
0706.3255 | Marcos Rigol Madrazo | Marcos Rigol, Tyler Bryant, Rajiv R. P. Singh | Numerical Linked-Cluster Algorithms. II. t-J models on the square
lattice | 7 pages, 12 figures, as published | Phys. Rev. E 75, 061119 (2007) | 10.1103/PhysRevE.75.061119 | null | cond-mat.str-el cond-mat.stat-mech | null | We discuss the application of a recently introduced numerical linked-cluster
(NLC) algorithm to strongly correlated itinerant models. In particular, we
present a study of thermodynamic observables: chemical potential, entropy,
specific heat, and uniform susceptibility for the t-J model on the square
lattice, with J/t=0.5 and 0.3. Our NLC results are compared with those obtained
from high-temperature expansions (HTE) and the finite-temperature Lanczos
method (FTLM). We show that there is a sizeable window in temperature where NLC
results converge without extrapolations whereas HTE diverges. Upon
extrapolations, the overall agreement between NLC, HTE, and FTLM is excellent
in some cases down to 0.25t. At intermediate temperatures NLC results are
better controlled than other methods, making it easier to judge the convergence
and numerical accuracy of the method.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:54:59 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Rigol",
"Marcos",
""
],
[
"Bryant",
"Tyler",
""
],
[
"Singh",
"Rajiv R. P.",
""
]
] |
0706.3256 | Jinzhi Lei JL | Jinzhi Lei, Kerson Huang | Dynamics of Alpha-Helix Formation in the CSAW Model | 18 pages, 10 figures | The European physical Journal E, 2008, vol. 27(2), pp. 197-204 | 10.1140/epje/i2007-10371-4 | null | cond-mat.soft | null | We study the folding dynamics of polyalanine (Ala$_{20}$), a protein fragment
with 20 residues whose native state is a single alpha helix. We use the CSAW
model (conditioned self-avoiding walk), which treats the protein molecule as a
chain in Brownian motion, with interactions that include hydrophobic forces and
internal hydrogen bonding. We find that large scale structures form before
small scale structures, and obtain the relevant relaxation times. We find that
helix nucleation occurs at two separate points on the protein chain. The
evolution of small and large scale structures involve different mechanisms.
While the former can be describe by rate equations governing the growth of
helical content, the latter is akin to the relaxation of an elastic solid.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:42:41 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 03:15:00 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Aug 2007 02:25:43 GMT"
}
] | 2013-10-09T00:00:00 | [
[
"Lei",
"Jinzhi",
""
],
[
"Huang",
"Kerson",
""
]
] |
0706.3257 | Hong Wu | Hong Wu (1,2) Yi-Nan Zhu (1,3), Chen Cao (1,3), Bo Qin (1)((1)
National Astronomical Observatories, Chinese Academy of Sciences, (2)
Visiting Scholar, Institute for Astronomy, University of Hawaii (3) Graduate
School, Chinese Academy of Sciences) | The Effects of Metallicity and AGN Activity on the Mid-Infrared Dust
Emission of Galaxies | 15 pages, 8 figures; accepted publication in ApJ | null | 10.1086/521070 | null | astro-ph | null | Using a sample of the $Spitzer$ SWIRE-field galaxies whose optical spectra
are taken from the Data Release 4 of the Sloan Digital Sky Survey, we study
possible correlations between the Mid-InfraRed (MIR) dust emission from these
galaxies and both their metallicities and AGN activities. We find that both
metallicity and AGN activity are well correlated with the following ratios:
PAH(Polycyclic Aromatic Hydrocarbon)-to-star, VSG(Very Small Grain)-to-star and
PAH-to-VSG, which can be characterized by $\nu L_{\nu}[8\mu m({\rm dust})]/\nu
L_{\nu}[3.6\mu m]$, $\nu L_{\nu}[24\mu m]/\nu L_{\nu}[3.6\mu m]$, and$\nu
L_{\nu}[8\mu m({\rm dust})]/\nu L_{\nu}[24\mu m]$ respectively. We argue that
our MIR-metallicity correlation could be explained by either the amount of dust
(ongoing dust formation) or dust destruction (PAHs and VSGs could be destroyed
by hard and intense radiation fields), and that the MIR-AGN correlation could
arise due to either PAH destruction or an enhanced VSG continuum by the central
AGN.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:44:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wu",
"Hong",
""
],
[
"Zhu",
"Yi-Nan",
""
],
[
"Cao",
"Chen",
""
],
[
"Qin",
"Bo",
""
]
] |
0706.3258 | Manmohan Gupta | Harleen Dahiya and Manmohan Gupta | Strangeness in the Nucleon | 4 pages, To appear in the Proceedings of International Workshop on
Theoretical High Energy Physics, 15-20 March 2007, Roorkee, India | AIPConf.Proc.939:3-6,2007 | 10.1063/1.2803778 | null | hep-ph | null | There are several different experimental indications, such as the strangeness
contribution to the magnetic moment of the proton, sigma_{\pi N} term, strange
spin polarization, ratio of strange and non strange quark flavor distributions
which suggest that the nucleon contains a hidden strangeness component which is
contradictory to the naive constituent quark model. Chiral constituent quark
model with configuration mixing (\chiCQM_{{\rm config}}) is known to provide a
satisfactory explanation of the ``proton spin problem'' and related issues. In
the present work, we have extended the model to carry out the calculations for
the parameters pertaining to the strange quark content of the nucleon, for
example, the strange spin polarization \Delta s, strange components of the weak
axial vector form factors \Delta \Sigma and \Delta_8 as well as F and D,
strangeness magnetic moment of the proton \mu_p^s, the strange quark content in
the nucleon f_s coming from the \sigma_{\pi N} term, the ratios between strange
and non-strange quarks \frac{2 s}{u+d} and \frac{2 s}{\bar u+ \bar d},
contribution of strangeness to angular momentum sum rule etc.. Our result
demonstrates the broad consistency with the experimental observations as well
as other theoretical considerations.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:51:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dahiya",
"Harleen",
""
],
[
"Gupta",
"Manmohan",
""
]
] |
0706.3259 | Yutaka Ihara | Yutaka Ihara, Jin Ozaki, Mamoru Doi, Toshikazu Shigeyama, Nobunari
Kashikawa, Yutaka Komiyama, Takashi Hattori | Searching for a Companion Star of Tycho's Type Ia Supernova with Optical
Spectroscopic Observations | 17 pages, 28 figures, accepted for publication in PASJ | null | 10.1093/pasj/59.4.811 | null | astro-ph | null | We report our first results of photometric and spectroscopic observations for
Tycho's supernova remnant (SNR Tycho) to search for the companion star of a
type Ia supernova (SN Ia). From photometric observations using Suprime-Cam on
the Subaru Telescope, we have picked up stars brighter than 22 mag (in
$V$-band) for spectroscopy, which are located within a circular region with the
radius of 30" around the center of SNR Tycho. If the ejecta of young supernova
remnants, such as SNR Tycho, have a sufficient amount of Fe I, we should be
able to detect absorption lines at 3720 \AA and 3860 \AA associated with
transitions from the ground state of Fe I in the spectrum of the companion
star. To identify the companion star of a SN Ia using these characteristic
absorption lines of Fe I, we made optical low-resolution spectroscopy of their
targets using FOCAS on the Subaru Telescope. In our spectroscopic observations,
we obtained spectra of 17 stars in the SNR Tycho region and compare them with
template stellar spectra. We detect significant absorption lines from two stars
at 3720 \AA. Since widths of their absorption lines are broad, it is likely
that the detected absorptions are due to Fe I in the expanding ejecta of SNR
Tycho. However, none of stars exhibits a clear red wing in the observed
profiles of the absorption, though a star in the background of the SNR should
show it. Hence, we suggest another interpretation that the detected absorption
lines might be caused by the peculiarity of stars. A star named Tycho(E) has
the absorption line at 3720 \AA and its projected position is close to the
center of SNR Tycho. Based on our observations, Tycho(E) is a new candidate as
the companion star of Tycho's supernova.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 03:55:12 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ihara",
"Yutaka",
""
],
[
"Ozaki",
"Jin",
""
],
[
"Doi",
"Mamoru",
""
],
[
"Shigeyama",
"Toshikazu",
""
],
[
"Kashikawa",
"Nobunari",
""
],
[
"Komiyama",
"Yutaka",
""
],
[
"Hattori",
"Takashi",
""
]
] |
0706.3260 | \'Ard\'is El\'iasd\'ottir | \'Ard\'is El\'iasd\'ottir and Ole M\"oller | A comparison of the strong lensing properties of the Sersic and the NFW
profiles | 19 pages (single column format), 11 figures. Accepted for publication
by JCAP | JCAP07(2007)006 | 10.1088/1475-7516/2007/07/006 | NSF-KITP-06-101 | astro-ph | null | We investigate the strong lensing properties of the Sersic profile as an
alternative to the NFW profile, focusing on applications to lens modelling of
clusters. Given an underlying Sersic dark matter profile, we study whether an
NFW profile can provide an acceptable fit to strong lensing constraints in the
form of single or multiple measured Einstein radii. We conclude that although
an NFW profile that fits the lensing constraints can be found in many cases,
the derived parameters may be biased. In particular, we find that for n~2,
which corresponds to massive clusters, the mass at r_200 of the best fit NFW is
overestimated (by a factor of ~2) and the concentration is very low (c~2). The
differences are important enough to warrant the inclusion of Sersic profile for
future analysis of strong lensing clusters.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 04:33:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Elíasdóttir",
"Árdís",
""
],
[
"Möller",
"Ole",
""
]
] |
0706.3261 | Aleksandr I. Sokolov | Y. L. Wang, A. K. Tagantsev, D. Damjanovic, N. Setter, V. K.
Yarmarkin, A. I. Sokolov, and I. A. Lukyanchuk | Landau thermodynamic potential for BaTiO_3 | 7 figures, 5 tables | J. Appl. Phys. 101, 104115 (2007) | 10.1063/1.2733744 | null | cond-mat.stat-mech cond-mat.mtrl-sci | null | In the paper, the description of the dielectric and ferroelectric properties
of BaTiO_3 single crystals using Landau thermodynamic potential is addressed.
Our results suggest that when using the sixth-power free energy expansion of
the thermodynamic potential, remarkably different values of the fourth-power
coefficient, \beta (the coefficient of P^4_i terms), are required to adequately
reproduce the nonlinear dielectric behavior of the paraelectric phase and the
electric field induced ferroelectric phase, respectively. In contrast, the
eighth-power expansion with a common set of coefficients enables a good
description for both phases at the same time. These features, together with the
data available in literature, strongly attest to the necessity of the
eighth-power terms in Landau thermodynamic potential of BaTiO_3. In addition,
the fourth-power coefficients, \beta and \xi (the coefficient of P^2_i P^2_j
terms), were evaluated from the nonlinear dielectric responses along [001],
[011], and [111] orientations in the paraelectric phase. Appreciable
temperature dependence was evidenced for both coefficients above T_C. Further
analysis on the linear dielectric response of the single domain crystal in the
tetragonal phase demonstrated that temperature dependent anharmonic
coefficients are also necessary for an adequate description of the dielectric
behavior in the ferroelectric phase. As a consequence, an eighth-power
thermodynamic potential, with some of the anharmonic coefficients being
temperature dependent, was proposed and compared with the existing potentials.
In general, the potential proposed in this work exhibits a higher quality in
reproducing the dielectric and ferroelectric properties of this prototypic
ferroelectric substance.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:05:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Y. L.",
""
],
[
"Tagantsev",
"A. K.",
""
],
[
"Damjanovic",
"D.",
""
],
[
"Setter",
"N.",
""
],
[
"Yarmarkin",
"V. K.",
""
],
[
"Sokolov",
"A. I.",
""
],
[
"Lukyanchuk",
"I. A.",
""
]
] |
0706.3262 | Kengo Matsumoto | Wolfgang Krieger and Kengo Matsumoto | Zeta functions and topological entropy of the Markov-Dyck shifts | 12 pages, 1 figure | M\"unster J. Math. 4(2011), 171-185 | null | null | math.DS math.OA | null | The Markov-Dyck shifts arise from finite directed graphs. An expression for
the zeta function of a Markov-Dyck shift is given. The derivation of this
expression is based on a formula in Keller (G. Keller, {\it Circular codes,
loop counting, and zeta-functions}, J. Combinatorial Theory {\bf 56} (1991),
pp. 75--83). For a class of examples that includes the Fibonacci-Dyck shift the
zeta functions and topological entropy ae determined.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:05:38 GMT"
}
] | 2013-06-10T00:00:00 | [
[
"Krieger",
"Wolfgang",
""
],
[
"Matsumoto",
"Kengo",
""
]
] |
0706.3263 | Arthur Yang | Beifang Chen, Arthur L. B. Yang, Terence Y. J. Zhang | A Blass-Sagan bijection on Eulerian equivalence classes | 10 pages, 2 figures | null | null | null | math.CO | null | Following the treatment of Blass and Sagan, we present an algorithmic
bijection between the Eulerian equivalence classes of totally cyclic
orientations and the spanning trees without internal activity edges for a given
graph.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:07:12 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Chen",
"Beifang",
""
],
[
"Yang",
"Arthur L. B.",
""
],
[
"Zhang",
"Terence Y. J.",
""
]
] |
0706.3264 | Adam L. Scott | CDF Collaboration: T. Aaltonen, et al | Search for New Particles Leading to Z+jets Final States in $p\bar{p}$
Collisions at $\sqrt{s}=1.96$ TeV | To be submitted to PRD | Phys.Rev.D76:072006,2007 | 10.1103/PhysRevD.76.072006 | FERMILAB-PUB-07-261-E | hep-ex | null | We present the results of a search for new particles that lead to a \Z boson
plus jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using the Collider
Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06 \ifb\
collected using \Z boson decays to $ee$ and $\mu\mu$ is used. We describe a
completely data-based method to predict the dominant background from
standard-model \Z+jet events. This method can be similarly applied to other
analyses requiring background predictions in multi-jet environments, as shown
when validating the method by predicting the background from $W$+jets in \ttbar
production. No significant excess above the background prediction is observed,
and a limit is set using a fourth generation quark model to quantify the
acceptance. Assuming $BR(b' \to b\Z) = 100%$ and using a leading-order
calculation of the $b'$ cross section, $b'$ quark masses below 268 $\gev/c^2$
are excluded at 95% confidence level.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:24:27 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"CDF Collaboration",
"",
""
],
[
"Aaltonen",
"T.",
""
]
] |
0706.3265 | Rudy Raymond | Kazuo Iwama, Harumichi Nishimura, Rudy Raymond, Shigeru Yamashita | Unbounded-error One-way Classical and Quantum Communication Complexity | 9 pages. To appear in Proc. ICALP 2007 | Proc. of the 34th International Colloquium on Automata, Languages
and Programming (ICALP 2007), LNCS 4596 pages 110 -- 121 | 10.1007/978-3-540-73420-8_12 | null | quant-ph | null | This paper studies the gap between quantum one-way communication complexity
$Q(f)$ and its classical counterpart $C(f)$, under the {\em unbounded-error}
setting, i.e., it is enough that the success probability is strictly greater
than 1/2. It is proved that for {\em any} (total or partial) Boolean function
$f$, $Q(f)=\lceil C(f)/2 \rceil$, i.e., the former is always exactly one half
as large as the latter. The result has an application to obtaining (again an
exact) bound for the existence of $(m,n,p)$-QRAC which is the $n$-qubit random
access coding that can recover any one of $m$ original bits with success
probability $\geq p$. We can prove that $(m,n,>1/2)$-QRAC exists if and only if
$m\leq 2^{2n}-1$. Previously, only the construction of QRAC using one qubit,
the existence of $(O(n),n,>1/2)$-RAC, and the non-existence of
$(2^{2n},n,>1/2)$-QRAC were known.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:43:28 GMT"
}
] | 2007-09-18T00:00:00 | [
[
"Iwama",
"Kazuo",
""
],
[
"Nishimura",
"Harumichi",
""
],
[
"Raymond",
"Rudy",
""
],
[
"Yamashita",
"Shigeru",
""
]
] |
0706.3266 | Shintaro Sawayama | Shintaro Sawayama | Quantization of the metric diagonal spacetime with Gaussian normal
coordinates | 3 pages, no figures | null | null | null | gr-qc | null | In the analysis of the Wheeler-DeWitt equation, we have simplified the
Hamiltonian constraint of the Wheeler-DeWitt equation using the coordinate
transformation. The coordinate is choose such that metric becomes diagonal and
as Gaussian normal coordinate. Or we treat small universe so that the metric
become diagonal and universe is covered by Gaussian normal coordinates. We have
solved the Wheeler-DeWitt equation of such universes. Such that universe
contains Biancki I type universe or the black hole universe.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:39:14 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Sawayama",
"Shintaro",
""
]
] |
0706.3267 | Lesfari Ahmed | A. Lesfari | Affine parts of abelian surfaces as complete intersection of three
quartics | 15 pages | null | null | null | nlin.SI | null | We consider an integrable system in five unknowns having three quartics
invariants. We show that the complex affine variety defined by putting these
invariants equal to generic constants, completes into an abelian surface; the
jacobian of a genus two hyperelliptic curve. This system is algebraic
completely integrable and it can be integrated in genus two hyperelliptic
functions.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:40:31 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Lesfari",
"A.",
""
]
] |
0706.3268 | Keitaro Kuwahara | K. Kuwahara, K. Iwasa, M. Kohgi, N. Aso, M. Sera, F. Iga | Detection of Neutron Scattering from Phase IV of Ce0.7La0.3B6: A
Confirmation of the Octupole Order | 4 pages, 4 figures | null | 10.1143/JPSJ.76.093702 | null | cond-mat.str-el | null | We have performed a single crystal neutron scattering experiment on
Ce0.7La0.3B6 to investigate the order parameter of phase IV microscopically.
Below the phase transition temperature 1.5 K of phase IV, weak but distinct
superlattice reflections at the scattering vector (h/2,h/2,l/2) (h, l = odd
number) have been observed by neutron scattering for the first time. The
intensity of the superlattice reflections is stronger for high scattering
vectors, which is quite different from the usual magnetic form factor of
magnetic dipoles. This result directly evidences that the order parameter of
phase IV has a complex magnetization density, consistent with the recent
experimental and theoretical prediction in which the order parameter is the
magnetic octupoles Tbeta with Gamma5 symmetry of point group Oh. Neutron
scattering experiments using short wavelength neutrons, as done in this study,
could become a general method to study the high-rank multipoles in f electron
systems.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:43:25 GMT"
},
{
"version": "v2",
"created": "Sat, 4 Aug 2007 08:54:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kuwahara",
"K.",
""
],
[
"Iwasa",
"K.",
""
],
[
"Kohgi",
"M.",
""
],
[
"Aso",
"N.",
""
],
[
"Sera",
"M.",
""
],
[
"Iga",
"F.",
""
]
] |
0706.3269 | James DiGuglielmo | James DiGuglielmo, Boris Hage, Alexander Franzen, Jaromir Fiurasek and
Roman Schnabel | Experimental characterization of Gaussian quantum communication channels | 9 pages, 4 figures, submitted to Physical Review A | null | 10.1103/PhysRevA.76.012323 | null | quant-ph | null | We present a full experimental characterization of continuous variable
quantum communication channels established by shared entanglement together with
local operations and classical communication. The resulting teleportation
channel was fully characterized by measuring all elements of the covariance
matrix of the shared two-mode squeezed Gaussian state. From the experimental
data we determined the lower bound to the quantum channel capacity, the
teleportation fidelity of coherent states and the logarithmic negativity and
the purity of the shared state. Additionally, a positive secret key rate was
obtained for two of the established channels.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 06:58:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"DiGuglielmo",
"James",
""
],
[
"Hage",
"Boris",
""
],
[
"Franzen",
"Alexander",
""
],
[
"Fiurasek",
"Jaromir",
""
],
[
"Schnabel",
"Roman",
""
]
] |
0706.3270 | Takehito Yokoyama | Takehito Yokoyama, Seiichiro Onari, and Yukio Tanaka | Theory of Fulde-Ferrell-Larkin-Ovchinnikov state of superconductors with
and without inversion symmetry: Hubbard model approach | 9 pages, 15 figures, 1 table | J. Phys. Soc. Jpn. 77, 064711 (2008) | 10.1143/JPSJ.77.064711 | null | cond-mat.supr-con cond-mat.str-el | null | We study Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state of superconductors
with and without inversion symmetry based on the Hubbard model on the square
lattice near half-filling, using the random phase approximation. We show that
center of mass momentum $Q$ tends to be parallel to $x$- or y-axis in the
presence of inversion symmetry, while $Q$ vector is likely to be perpendicular
to the magnetic field in the absence of inversion symmetry. We also clarify
that $d+f$-wave pairing is favored and the hetero spin triplet $f$-wave state
is present in the FFLO state unlike state in the superconductors only with the
Rashba type spin-orbit coupling (RSOC) originating from the broken inversion
symmetry. The triplet $f$-wave state is enhanced by magnetic field and the
RSOC. This stems from the reduction of the spin susceptibilities by the
magnetic field and the RSOC.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:40:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yokoyama",
"Takehito",
""
],
[
"Onari",
"Seiichiro",
""
],
[
"Tanaka",
"Yukio",
""
]
] |
0706.3271 | Valentina Klochkova | Tonu Kipper (1) and Valentina Klochkova (2) ((1) - Tartu Observatory,
Toravere, Estonia; (2) - Special Astrophysical Observatory RAS, Nizhnij
Arkhyz, Russia) | A cool R Coronae Borealis star Z UMi | 11 pages, 3 figures, 2 tables | BalticAstron.15:531-537,2006 | null | null | astro-ph | null | The high resolution spectra of a R CrB type star Z UMi are analysed. The
atmospheric parameters of Z UMi are estimated: Teff=5250+/-250K and log
g=0.5+/-0.3. This places Z UMi among the coolest R CrB stars. The hydrogen
deficiency of Z UMi is confirmed. The abundances of other elements resemble
those found for the minority group of R CrB stars. We note very low iron
abundance, [Fe/H]=-1.85, and an excess of lithium, [Li/Fe]=+1.9.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:40:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kipper",
"Tonu",
""
],
[
"Klochkova",
"Valentina",
""
]
] |
0706.3272 | Marica Branchesi | M. Branchesi (1,2), I. M. Gioia (1), C. Fanti (1), R. Fanti (1) ((1)
Istituto di Radioastronomia INAF, Bologna, Italy,(2) Universita' di Bologna,
Italy) | High redshift X-ray galaxy clusters. I. The impact of point sources on
the cluster properties | 16 pages, 18 postscript figures. Accepted for publication in
Astronomy & Astrophysics | null | 10.1051/0004-6361:20077466 | null | astro-ph | null | The current generation of X-ray observatories like Chandra allows studies
with very fine spatial details. It is now possible to resolve X-ray point
sources projected into the cluster diffuse emission and exclude them from the
analysis to estimate the ``correct'' X-ray observables. In order to verify the
incidence of point sources on the cluster thermal emission and to evaluate the
impact of their non-thermal emission on the determination of cluster
properties, we used a sample of 18 high-z (0.25 < z < 1.01) clusters from the
Chandra archive. We performed a detailed analysis of the cluster properties and
compared the changes observed in the X-ray observables, like temperature and
luminosity or their inter-relation, when one keeps the point sources in the
analysis. The point sources projected into the cluster extended emission affect
the estimates of cluster temperature or luminosity considerably (up to 13% and
17% respectively). These percentages become even larger for clusters with z >
0.7 where temperature and luminosity increase up to 24% and 22%, respectively.
Thus the point sources should be removed to correctly estimate the cluster
properties. However the inclusion of the point sources does not impact
significantly the slope and normalization of the L-T relationship since for
each cluster the correction to be applied to T and L produces a moderate shift
in the L-T plane almost parallel to the best-fit of the ``correct'' L-T
relation.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:46:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Branchesi",
"M.",
""
],
[
"Gioia",
"I. M.",
""
],
[
"Fanti",
"C.",
""
],
[
"Fanti",
"R.",
""
]
] |
0706.3273 | Beifang Chen | Beifang Chen | Orientations, lattice polytopes, and group arrangements I: Chromatic and
tension polynomials of graphs | 25 pages, 3 figures | null | null | null | math.CO | null | This is the first one of a series of papers on association of orientations,
lattice polytopes, and abelian group arrangements to graphs. The purpose is to
interpret the integral and modular tension polynomials of graphs at zero and
negative integers. The whole exposition is put under the framework of subgroup
arrangements and the application of Ehrhart polynomials. Such viewpoint leads
to the following main results of the paper: (i) the reciprocity law for
integral tension polynomials; (ii) the reciprocity law for modular tension
polynomials; and (iii) a new interpretation for the value of the Tutte
polynomial $T(G;x,y)$ of a graph $G$ at $(1,0)$ as the number of
cut-equivalence classes of acyclic orientations on $G$.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:37:20 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Chen",
"Beifang",
""
]
] |
0706.3274 | Maryline Briquet | M. Briquet, T. Morel, A. Thoul, R. Scuflaire, A. Miglio, J. Montalban,
M.-A. Dupret, C. Aerts | An asteroseismic study of the beta Cephei star theta Ophiuchi:
constraints on global stellar parameters and core overshooting | Accepted for publication in Monthly Notices of the Royal Astronomical
Society Main Journal on 2007-06-21, 8 pages, 4 figures | null | 10.1111/j.1365-2966.2007.12142.x | null | astro-ph | null | We present a seismic study of the beta Cephei star theta Ophiuchi. Our
analysis is based on the observation of one radial mode, one rotationally split
l = 1 triplet and three components of a rotationally split l = 2 quintuplet for
which the m-values were well identified by spectroscopy. We identify the radial
mode as fundamental, the triplet as p_1 and the quintuplet as g_1. Our NLTE
abundance analysis results in a metallicity and CNO abundances in full
agreement with the most recent updated solar values. With X \in [0.71,0.7211]
and Z \in [0.009,0.015], and using the Asplund et al. (2005) mixture but with a
Ne abundance about 0.3 dex larger (Cunha et al. 2006), the matching of the
three independent modes, enables us to deduce constrained ranges for the mass
(M = 8.2 +/- 0.3 Msun) and central hydrogen abundance (X_c = 0.38 +/- 0.02) of
theta Oph and to prove the occurrence of core overshooting (alpha_ov = 0.44 +/-
0.07). We also derive an equatorial rotation velocity of 29 +/- 7 km/s.
Moreover, we show that the observed non-equidistance of the l=1 triplet can be
reproduced by second order effects of rotation. Finally, we show that the
observed rotational splitting of two modes cannot rule out a rigid rotation
model.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:52:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Briquet",
"M.",
""
],
[
"Morel",
"T.",
""
],
[
"Thoul",
"A.",
""
],
[
"Scuflaire",
"R.",
""
],
[
"Miglio",
"A.",
""
],
[
"Montalban",
"J.",
""
],
[
"Dupret",
"M. -A.",
""
],
[
"Aerts",
"C.",
""
]
] |
0706.3275 | Lorenzo Ulivi | L. Ulivi, M. Celli, A. Giannasi, A.J. Ramirez-Cuesta, D.J. Bull, M.
Zoppi | Quantum rattling of molecular hydrogen in clathrate hydrate nanocavities | null | null | 10.1103/PhysRevB.76.161401 | null | cond-mat.mtrl-sci | null | We have performed high-resolution inelastic neutron scattering studies on
three samples of hydrogenated tetrahydrofuran-water clathrates, containing
either H2 at different para/ortho concentrtion, or HD. By a refined analysis of
the data, we are able to assign the spectral bands to rotational and
center-of-mass translational transitions of either para- or ortho-H2. The H2
molecule rotates almost freely, while performing a translational motion
(rattling) in the nanometric-size cage, resulting a paradigmatic example of
quantum dynamics in a non-harmonic potential well. Both the H2 rotational
transition and the fundamental of the rattling transition split into triplets,
having different separation. The splitting is a consequence of a substantial
anisotropy of the environment with respect to the orientation of the molecule
in the cage, in the first case, or with respect to the center-of-mass position
inside the cage, in the second case. The values of the transition frequencies
and band intensities have been quantitatively related to the details of the
interaction potential between H2 and the water molecules, with a very good
agreement.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:56:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ulivi",
"L.",
""
],
[
"Celli",
"M.",
""
],
[
"Giannasi",
"A.",
""
],
[
"Ramirez-Cuesta",
"A. J.",
""
],
[
"Bull",
"D. J.",
""
],
[
"Zoppi",
"M.",
""
]
] |
0706.3276 | Wang Lei | Lei Wang, Giuliano Benenti, Giulio Casati, Baowen Li | The ratchet effect and the transporting islands in the chaotic sea | 5 pages, 6 figures | Phys. Rev. Lett. 99, 244101 (2007) | 10.1103/PhysRevLett.99.244101 | null | cond-mat.stat-mech | null | We study directed transport in a classical deterministic dissipative system.
We consider the generic case of mixed phase space and show that large ratchet
currents can be generated thanks to the presence, in the Hamiltonian limit, of
transporting stability islands embedded in the chaotic sea. Due to the
simultaneous presence of chaos and dissipation the stationary value of the
current is independent of initial conditions, except for initial states with
very small measure.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:56:45 GMT"
}
] | 2007-12-29T00:00:00 | [
[
"Wang",
"Lei",
""
],
[
"Benenti",
"Giuliano",
""
],
[
"Casati",
"Giulio",
""
],
[
"Li",
"Baowen",
""
]
] |
0706.3277 | Marica Branchesi | M. Branchesi (1,2), I. M. Gioia (1), C. Fanti (1), R. Fanti (1) ((1)
Istituto di Radioastronomia INAF, Bologna, Italy,(2) Universita' di Bologna,
Italy) | High redshift X-ray galaxy clusters. II. The L_X-T relationship
revisited | 14 pages, 10 postscript figures. Accepted for publication in
Astronomy & Astrophysics. Corrected typos | null | 10.1051/0004-6361:20077467 | null | astro-ph | null | In this paper we re-visit the observational relation between X-ray luminosity
and temperature for high-z galaxy clusters and compare it with the local L_X-T
and with theoretical models. To these ends we use a sample of 17 clusters
extracted from the Chandra archive supplemented with additional clusters from
the literature, either observed by Chandra or XMM-Newton, to form a final
sample of 39 high redshift (0.25 < z < 1.3) objects. Different statistical
approaches are adopted to analyze the L_X-T relation. The slope of the L_X-T
relation of high redshift clusters is steeper than expected from the
self-similar model predictions and steeper, even though still compatible within
the errors, than the local L_X-T slope. The distant cluster L_X-T relation
shows a significant evolution with respect to the local Universe: high-z
clusters are more luminous than the local ones by a factor ~2 at any given
temperature. The evolution with redshift of the L_X-T relation cannot be
described by a single power law nor by the evolution predicted by the
self-similar model. We find a strong evolution, similar or stronger than the
self-similar model, from z = 0 to z <0.3 followed by a much weaker, if any,
evolution at higher redshift. The weaker evolution is compatible with
non-gravitational models of structure formation. According to us a
statistically significant sample of nearby clusters (z < 0.25) should be
observed with the current available X-ray telescopes to completely exclude
observational effects due to different generation detectors and to understand
this novel result.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 07:59:01 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 12:56:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Branchesi",
"M.",
""
],
[
"Gioia",
"I. M.",
""
],
[
"Fanti",
"C.",
""
],
[
"Fanti",
"R.",
""
]
] |
0706.3278 | Hong Miao | Hong Miao, Chongshou Gao | Simulations on the Heavy Hadron Transport at RHIC | 5 pages, 4 figures | null | null | null | nucl-th hep-ph nucl-ex | null | Based on the hadron transport frames, detailed simulations are carried out to
discuss $\phi$, $\Omega$ productions and the significant enhancements in the
very low $p_T$ region for some of the soft spectra in RHIC. Elastic
interactions are introduced in the simulations. The elastic cross sections vary
from different hadrons and energy scales, which can qualitatively explain the
different collective motions of various hadrons.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:56:04 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Miao",
"Hong",
""
],
[
"Gao",
"Chongshou",
""
]
] |
0706.3279 | Atsuko Kibayashi | The Belle Collaboration: K.Abe, et al | Measurement of the Branching Fraction for B^0 --> a1(1260)+-pi-+ with
535 Million BBbar Pairs | 9 pages, 2 figures, presented at FPCP 2007; small correction in a
reference | null | null | BELLE-CONF-0728 | hep-ex | null | We present a measurement of the branching fraction for the decay
B^0->a1+(1260)pi- with a1+->pi+pi+pi- using a data sample containing 535x10^6
BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy
e+e- collider operating at the Upsilon(4S) resonance. We measure the branching
fraction Br(B^0->a1+pi-)Br(a1+->pi+pi+pi-) = (14.9 +- 1.6 +- 2.3)x10^-6, where
the first and second errors are statistical and systematic, respectively.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:36:49 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Jun 2007 03:51:10 GMT"
},
{
"version": "v3",
"created": "Mon, 9 Jul 2007 01:38:21 GMT"
}
] | 2007-07-09T00:00:00 | [
[
"The Belle Collaboration",
"",
""
],
[
"Abe",
"K.",
""
]
] |
0706.3280 | Andrey Sotnikov | Yuriy V. Slyusarenko and Andrey G. Sotnikov | Theoretical background for observing ultra-slow microwaves in a
Bose-Einstein condensate of alkali atoms | 6 pages, 2 figures | null | null | null | cond-mat.stat-mech cond-mat.other | null | We represent a new microscopic approach that allows studying the propagation
properties of microwaves in a Bose-Einstein condensate of alkali atoms. It is
assumed that the frequency of signal is tuned up to the transition between
hyperfine ground state levels of such atoms. Pulse slowing conditions
dependence on the system parameters is found. It is shown that the slowed
signal can propagate in mentioned system with rather small energy loss. Such
phenomenon is also studied in case of hyperfine levels Zeeman splitting. A
possibility of ultra-slow microwaves observing in a condensed gas of cesium
atoms is discussed.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:31:41 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Slyusarenko",
"Yuriy V.",
""
],
[
"Sotnikov",
"Andrey G.",
""
]
] |
0706.3281 | Davide Fedele | D. Fedele (Universita' di Padova, ESO), M.E. van den Ancker (ESO),
M.G. Petr-Gotzens (ESO) and P. Rafanelli (Universita' di Padova) | Optical and infrared properties of V1647 Orionis during the 2003-2006
outburst. II. Temporal evolution of the eruptive source | 12 pages, 7 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20077725 | null | astro-ph | null | The occurrence of new FU Orionis-like objects is fundamental to understand
the outburst mechanism in young stars and their role in star formation and disk
evolution. Our work is aimed at investigating the properties of the recent
outburst of V1647 Ori. Using optical and mid infrared long slit spectroscopy we
monitored V1647 Ori in outburst between February 2004 and January 2006. The
optical spectrum is characterized by Halpha and Hbeta in P-Cygni profile and by
many weak FeI and FeII emission lines. Short timescale variability was measured
in the continuum and line emission. On January 2006 we detected for the first
time forbidden emission lines ([OI], [SII] and [FeII]). These lines are likely
produced by an Herbig-Haro object driven by V1647 Ori. The mid infrared the
spectrum of V1647 Ori is flat and featureless at all epochs. The SED changed
drastically: the source was much redder in the early outburst than in the final
phase. The magnitude rise and the SED of V1647 Ori resembles that of a FUor
while the duration and recurrence of the outburst resemble that of a EXor. The
optical spectrum is clearly distinct from either the absorption line spectrum
of a FUor or the T Tauri-like spectrum of an EXor. Our data are consistent with
a disk instability event which led to an increase of the mass accretion rate.
The data also suggest the presence of a circumstellar envelope around the
star+disk system. The peculiar N band spectrum might be explained by dust
sublimation in the outer layers of the disk. The presence of the envelope and
the outburst statistics suggest that these instability events occur only in a
specific stage of a Class I source (e.g. in the transition phase to an
optically visible star surrounded by a protoplanetary disk). We discuss the
outburst mechanisms in term of the thermal instability model.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:40:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fedele",
"D.",
"",
"Universita' di Padova, ESO"
],
[
"Ancker",
"M. E. van den",
"",
"ESO"
],
[
"Petr-Gotzens",
"M. G.",
"",
"ESO"
],
[
"Rafanelli",
"P.",
"",
"Universita' di Padova"
]
] |
0706.3282 | Tao Zhang | Tao Zhang | Braided Hom-Lie bialgebras | 35 pages, a first version | null | null | null | math.QA math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the new concept of braided Hom-Lie bialgebras which is a
generalization of Sommerh\"{a}user-Majid's braided Lie bialgebras and Yau's
Hom-Lie bialgebras. Using this concept we give the unified product construction
for Hom-Lie bialgebras which can be seen as a Hom-Lie version of
Bespalov-Drabant's cocycle cross product bialgebras. Some special cases of
unified products such as crossed product and matched pair of braided Hom-Lie
bialgebras are investigated. As an application, we solve the Agore-Militaru
extending problem for Hom-Lie bialgebras by using some non-abelian cohomology
theory. Furthermore, one dimensional flag extending structures for Hom-Lie
bialgebras are also investigated.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:45:12 GMT"
},
{
"version": "v10",
"created": "Mon, 14 Mar 2022 05:52:21 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 03:54:47 GMT"
},
{
"version": "v3",
"created": "Sat, 26 Jan 2008 02:47:53 GMT"
},
{
"version": "v4",
"created": "Mon, 15 Jun 2009 07:10:19 GMT"
},
{
"version": "v5",
"created": "Thu, 26 Aug 2021 20:21:57 GMT"
},
{
"version": "v6",
"created": "Mon, 30 Aug 2021 04:51:07 GMT"
},
{
"version": "v7",
"created": "Sun, 19 Sep 2021 17:55:00 GMT"
},
{
"version": "v8",
"created": "Fri, 11 Feb 2022 15:09:34 GMT"
},
{
"version": "v9",
"created": "Fri, 11 Mar 2022 01:04:25 GMT"
}
] | 2022-03-15T00:00:00 | [
[
"Zhang",
"Tao",
""
]
] |
0706.3283 | Galina L. Klimchitskaya | R.S.Decca, D.Lopez, E.Fischbach, G.L.Klimchitskaya, D.E.Krause,
V.M.Mostepanenko | Novel constraints on light elementary particles and extra-dimensional
physics from the Casimir effect | 13 pages, 6 figures, 2 tables, svjor.cls is used, to appear in Eur.
Phys. J. C | Eur.Phys.J.C51:963-975,2007 | 10.1140/epjc/s10052-007-0346-z | null | hep-ph quant-ph | null | We present supplementary information on the recent indirect measurement of
the Casimir pressure between two parallel plates using a micromachined
oscillator. The equivalent pressure between the plates is obtained by means of
the proximity force approximation after measuring the force gradient between a
gold coated sphere and a gold coated plate. The data are compared with a new
theoretical approach to the thermal Casimir force based on the use of the
Lifshitz formula, combined with a generalized plasma-like dielectric
permittivity which takes into account interband transitions of core electrons.
The theoretical Casimir pressures calculated using the new approach are
compared with those computed in the framework of the previously used impedance
approach and also with the Drude model approach. The latter is shown to be
excluded by the data at a 99.9% confidence level within a wide separation range
from 210 to 620 nm. The level of agreement between the data and theoretical
approaches based on the generalized plasma model, or the Leontovich surface
impedance, is used to set stronger constraints on the Yukawa forces predicted
from the exchange of light elementary particles and/or extra-dimensional
physics. The resulting constraints are the strongest in the interaction region
from 20 to 86 nm with a largest improvement by a factor of 4.4 at 26 nm.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:46:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Decca",
"R. S.",
""
],
[
"Lopez",
"D.",
""
],
[
"Fischbach",
"E.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Krause",
"D. E.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] |
0706.3284 | Kai Cieliebak | Kai Cieliebak, Janko Latschev | The role of string topology in symplectic field theory | 40 pages, 19 figures, last section changed into a joint appendix with
K. Mohnke | null | null | null | math.SG | null | We outline a program for incorporating holomorphic curves with Lagrangian
boundary conditions into symplectic field theory, with an emphasis on ideas,
geometric intuition, and a description of the resulting algebraic structures.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:57:27 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 05:20:09 GMT"
}
] | 2007-10-09T00:00:00 | [
[
"Cieliebak",
"Kai",
""
],
[
"Latschev",
"Janko",
""
]
] |
0706.3285 | Nick Evans | Nick Evans and Ed Threlfall | Quark Mass in the Sakai-Sugimoto Model of Chiral Symmetry Breaking | 14 pages, 4 figures, added discussion | null | null | SHEP-07-18 | hep-th | null | We re-analyze D8 brane embeddings in the geometry of a D4 brane wrapped on a
circle that describe chiral symmetry breaking in a strongly coupled
non-supersymmetric gauge theory. We argue that if the holographic fields are
correctly interpreted, the original embeddings describe a complex quark mass
and condensate in the theory. We show that in this interpretation when a quark
mass is present there is a massive pseudo Goldstone boson (pion). A previously
identified massless fluctuation is, we argue, not a physical state in the field
theory. We also determine the behaviour of the quark condensate as a function
of the quark mass.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:51:07 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Oct 2007 15:01:29 GMT"
}
] | 2007-10-23T00:00:00 | [
[
"Evans",
"Nick",
""
],
[
"Threlfall",
"Ed",
""
]
] |
0706.3286 | Yohan Payan | Antoine Leroy (TIMC - Imag), Pierre Mozer (TIMC - Imag), Yohan Payan
(TIMC - Imag), Jocelyne Troccaz (TIMC - Imag) | Intensity-Based Registration of Freehand 3D Ultrasound and CT-scan
Images of the Kidney | null | International Journal of Computer Assisted Radiology and Surgery
2, 1 (2007) 31-41 | 10.1007/s11548-007-0077-5 | null | physics.med-ph | null | This paper presents a method to register a pre-operative Computed-Tomography
(CT) volume to a sparse set of intra-operative Ultra-Sound (US) slices. In the
context of percutaneous renal puncture, the aim is to transfer planning
information to an intra-operative coordinate system. The spatial position of
the US slices is measured by optically localizing a calibrated probe. Assuming
the reproducibility of kidney motion during breathing, and no deformation of
the organ, the method consists in optimizing a rigid 6 Degree Of Freedom (DOF)
transform by evaluating at each step the similarity between the set of US
images and the CT volume. The correlation between CT and US images being
naturally rather poor, the images have been preprocessed in order to increase
their similarity. Among the similarity measures formerly studied in the context
of medical image registration, Correlation Ratio (CR) turned out to be one of
the most accurate and appropriate, particularly with the chosen non-derivative
minimization scheme, namely Powell-Brent's. The resulting matching transforms
are compared to a standard rigid surface registration involving segmentation,
regarding both accuracy and repeatability. The obtained results are presented
and discussed.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:51:28 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Leroy",
"Antoine",
"",
"TIMC - Imag"
],
[
"Mozer",
"Pierre",
"",
"TIMC - Imag"
],
[
"Payan",
"Yohan",
"",
"TIMC - Imag"
],
[
"Troccaz",
"Jocelyne",
"",
"TIMC - Imag"
]
] |
0706.3287 | Marcella Grasso | M. Grasso, Z.Y. Ma, E. Khan, J. Margueron, N. Van Giai | Evolution of the proton sd states in neutron-rich Ca isotopes | 7 figures | Phys.Rev.C76:044319,2007 | 10.1103/PhysRevC.76.044319 | null | nucl-th | null | We analyze the evolution with increasing isospin asymmetry of the proton
single-particle states 2s1/2 and 1d3/2 in Ca isotopes, using non-relativistic
and relativistic mean field approaches. Both models give similar trends and it
is shown that this evolution is sensitive to the neutron shell structure, the
two states becoming more or less close depending on the neutron orbitals which
are filled. In the regions where the states get closer some parametrizations
predict an inversion between them. This inversion occurs near $^{48}$Ca as well
as very far from stability where the two states systematically cross each other
if the drip line predicted in the model is located far enough. We study in
detail the modification of the two single-particle energies by using the
equivalent potential in the Schroedinger-like Skyrme-Hartree-Fock equations.
The role played by central, kinetic and spin-orbit contributions is discussed.
We finally show that the effect of a tensor component in the effective
interaction considerably favors the inversion of the two proton states in
$^{48}$Ca.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:53:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grasso",
"M.",
""
],
[
"Ma",
"Z. Y.",
""
],
[
"Khan",
"E.",
""
],
[
"Margueron",
"J.",
""
],
[
"Van Giai",
"N.",
""
]
] |
0706.3288 | Leonid Glozman | L. Ya. Glozman | Alternative experimental evidence for chiral restoration in excited
baryons | 4 pp. A new footnote with an alternative proof of impossibility of
parity doublet decay into pi + N is added. To appear in Phys. Rev. Lett | Phys.Rev.Lett.99:191602,2007 | 10.1103/PhysRevLett.99.191602 | null | hep-ph hep-ex nucl-ex nucl-th | null | Given existing empirical spectral patterns of excited hadrons it has been
suggested that chiral symmetry is approximately restored in excited hadrons at
zero temperature/density (effective symmetry restoration). If correct, this
implies that mass generation mechanisms and physics in excited hadrons is very
different as compared to the lowest states. One needs an alternative and
independent experimental information to confirm this conjecture. Using very
general chiral symmetry arguments it is shown that strict chiral restoration in
a given excited nucleon forbids its decay into the N \pi channel. Hence those
excited nucleons which are assumed from the spectroscopic patterns to be in
approximate chiral multiplets must only "weakly" decay into the N \pi channel,
(f_{N^*N\pi}/f_{NN\pi})^2 << 1. However, those baryons which have no chiral
partner must decay strongly with a decay constant comparable with f_{NN\pi}.
Decay constants can be extracted from the existing decay widths and branching
ratios. It turnes out that for all those well established excited nucleons
which can be classified into chiral doublets N_+(1440) - N_-(1535), N_+(1710) -
N_-(1650), N_+(1720) - N_-(1700), N_+(1680) - N_-(1675), N_+(2220) - N_-(2250),
N_+(?) - N_-(2190), N_+(?) - N_-(2600), the ratio is (f_{N^*N\pi}/f_{NN\pi})^2
~ 0.1 or much smaller for the high-spin states. In contrast, the only well
established excited nucleon for which the chiral partner cannot be identified
from the spectroscopic data, N(1520), has a decay constant into the N\pi
channel that is comparable with f_{NN\pi}. This gives an independent
experimental verification of the chiral symmetry restoration scenario.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 08:55:34 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 17:25:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Glozman",
"L. Ya.",
""
]
] |
0706.3289 | Alexander Tsukanov | Alexander V. Tsukanov | Single-qubit operations in the double-donor structure driven by optical
and voltage pulses | to appear in Phys. Rev. B | null | 10.1103/PhysRevB.76.035328 | null | cond-mat.mes-hall | null | We study theoretically the quantum dynamics of an electron in the
singlyionized double-donor structure in the semiconductor host under the
influence of laser pulses whose frequencies are close to structure resonant
frequencies. This system can be used as a charge qubit where the logical states
are defined by the lowest two energy states of the remaining valence electron
localized around one or another donor. The quantum operations are performed via
resonant or Raman-like transitions between the localized (qubit) states and the
excited states delocalized over the structure, combined with phase shifts
between qubit states generated by voltage pulses. The possibility of
realization of arbitrary single-qubit rotations is demonstrated.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:01:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tsukanov",
"Alexander V.",
""
]
] |
0706.3290 | Michael Hauer | M. Hauer, V.V. Begun, M.I. Gorenstein | Multiplicity Distributions in Canonical and Microcanonical Statistical
Ensembles | 53 pages, 7 figures | Eur.Phys.J.C58:83-110,2008 | 10.1140/epjc/s10052-008-0724-1 | null | nucl-th | null | The aim of this paper is to introduce a new technique for calculation of
observables, in particular multiplicity distributions, in various statistical
ensembles at finite volume. The method is based on Fourier analysis of the
grand canonical partition function. Taylor expansion of the generating function
is used to separate contributions to the partition function in their power in
volume. We employ Laplace's asymptotic expansion to show that any equilibrium
distribution of multiplicity, charge, energy, etc. tends to a multivariate
normal distribution in the thermodynamic limit. Gram-Charlier expansion allows
additionally for calculation of finite volume corrections. Analytical formulas
are presented for inclusion of resonance decay and finite acceptance effects
directly into the system partition function. This paper consolidates and
extends previously published results of current investigation into properties
of statistical ensembles.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:26:54 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Nov 2007 17:27:56 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Hauer",
"M.",
""
],
[
"Begun",
"V. V.",
""
],
[
"Gorenstein",
"M. I.",
""
]
] |
0706.3291 | Bernhard Wolf | John Eckelt, B.A. Wolf | Continuous Spin Fractionation: A large scale method to improve the
performance of polymers | 10 pages, 5 figures | null | null | null | cond-mat.mtrl-sci | null | Most technical polymers and many biopolymers contain very different molecular
species (unlike chain length, molecular architecture and/or chemical
composition) in contrast to pure low molecular weight compounds. This
inconsistent constitution of macromolecules proves very adverse in many cases.
An adequate fractionation of polydisperse polymers is therefore mandatory.
Very efficient means are available for analytical purposes. However, these
methods break down as soon as the required amount of product exceeds some ten
grams. In order to gain access to large enough quantities of sufficiently
uniform polymer samples, we have developed a special kind of extraction process
called Continuous Spin Fractiona-tion (CSF). The better soluble macromolecular
species are preferentially transferred from a feed phase (concentrated polymer
solution) into a pickup phase (solvent of tai-lored thermodynamic quality). The
main problem of the procedure lies in the high vis-cosities of reasonably
concentrated polymer solutions, impeding the attainment of ther-modynamic
equilibria. This hurdle could be cleared by means of spinning nozzles through
which the feed is pressed into the pickup phase. CSF can be implemented to any
soluble polymer and is likewise apt for the production of small and of large
amounts of polymer samples with the required uniformity. This contribution
explains how to customize CSF to the polymer of interest and presents a number
of typical ex-amples.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:22:48 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Eckelt",
"John",
""
],
[
"Wolf",
"B. A.",
""
]
] |
0706.3292 | Evgeny Strahov | Eugene Strahov | A Differential Model for the Deformation of the Plancherel Growth
Process | 33 pages | null | null | null | math.CO math-ph math.MP | null | In the present paper we construct and solve a differential model for the
q-analog of the Plancherel growth process. The construction is based on a
deformation of the Makrov-Krein correspondence between continual diagrams and
probability distributions.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:25:04 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 03:58:33 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Strahov",
"Eugene",
""
]
] |
0706.3293 | J. Schnack | J. Schnack (U. Bielefeld), P. Hage and H.-J. Schmidt (U. Osnabrueck) | Optimized implementation of the Lanczos method for magnetic systems | 9 pages, 2 figues, submitted to Journal of Computational Physics | J. Comput. Phys. 227 (2008) 4512-4517 | 10.1016/j.jcp.2008.01.027 | null | cond-mat.str-el cond-mat.stat-mech | null | Numerically exact investigations of interacting spin systems provide a major
tool for an understanding of their magnetic properties. For medium size systems
the approximate Lanczos diagonalization is the most common method. In this
article we suggest two improvements: efficient basis coding in subspaces and
simple restructuring for openMP parallelization.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:26:44 GMT"
}
] | 2008-06-02T00:00:00 | [
[
"Schnack",
"J.",
"",
"U. Bielefeld"
],
[
"Hage",
"P.",
"",
"U. Osnabrueck"
],
[
"Schmidt",
"H. -J.",
"",
"U. Osnabrueck"
]
] |
0706.3294 | Christian Corda cordac | Christian Corda | Moriond 07 proceedings:"Extension of the frequency-range of
interferometers for the "magnetic" components of gravitational waves?" | To appear in proceedings of the Rencontres de Moriond, Gravitational
Waves and Experimental Gravity, La Thuile, Val d'Aosta, Italy (March 11-18,
2007) | Proceedings of the XLIInd Rencontres de Moriond, Gravitational
Waves and Experimental Gravity, p. 95, Ed. J. Dumarchez and J. T. Tran, Than
Van, THE GIOI Publishers (2007) | null | null | gr-qc | null | Recently some papers in the literature have shown the presence and importance
of the so-called {}"magnetic" components of gravitational waves (GWs), which
have to be taken into account in the context of the total response functions of
interferometers for GWs propagating from arbitrary directions. In this paper
the response functions for the magnetic components are re-analysed in the full
frequency dependence answering to the question of the title.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:28:04 GMT"
}
] | 2010-01-25T00:00:00 | [
[
"Corda",
"Christian",
""
]
] |
0706.3295 | Beniamin Mounits Mr | Beniamin Mounits | Lower bounds on the minimum average distance of binary codes | 19 pages | null | null | null | cs.IT math.CO math.IT | null | New lower bounds on the minimum average Hamming distance of binary codes are
derived. The bounds are obtained using linear programming approach.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:32:50 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Mounits",
"Beniamin",
""
]
] |
0706.3296 | Michael Marek Koza | M.M. Koza, R.P. May, H. Schober | On the heterogeneous character of water's amorphous polymorphism | null | J. Appl. Cryst. 40, s517-s521, (2007) | 10.1107/S0021889807004992 | null | cond-mat.dis-nn cond-mat.soft | null | In this letter we report {\it in situ} small--angle neutron scattering
results on the high--density (HDA) and low-density amorphous (LDA) ice
structures and on intermediate structures as found during the temperature
induced transformation of HDA into LDA. We show that the small--angle signal is
characterised by two $Q$ regimes featuring different properties ($Q$ is the
modulus of the scattering vector defined as $Q =
4\pi\sin{(\Theta)}/\lambda_{\rm i}$ with $\Theta$ being half the scattering
angle and $\lambda_{\rm i}$ the incident neutron wavelength). The very low--$Q$
regime ($< 5\times 10^{-2}$ \AA $^{-1}$) is dominated by a Porod--limit
scattering. Its intensity reduces in the course of the HDA to LDA
transformation following a kinetics reminiscent of that observed in wide--angle
diffraction experiments. The small--angle neutron scattering formfactor in the
intermediate regime of $5 \times 10^{-2} < Q < 0.5$ \AA$^{-1}$ HDA and LDA
features a rather flat plateau. However, the HDA signal shows an ascending
intensity towards smaller $Q$ marking this amorphous structure as
heterogeneous. When following the HDA to LDA transition the formfactor shows a
pronounced transient excess in intensity marking all intermediate structures as
strongly heterogeneous on a length scale of some nano--meters.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 12:07:09 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Koza",
"M. M.",
""
],
[
"May",
"R. P.",
""
],
[
"Schober",
"H.",
""
]
] |
0706.3297 | Mikhail Rogal | M. Rogal and S. Moch | Higher Mellin moments for charged current DIS | Contribution to the proceedings of the conference DIS 2007, Munich,
April 2007 | PoSACAT2007:086,2007 | 10.3360/dis.2007.48 | DESY 07-086 | hep-ph | null | We report on our recent results for deep-inelastic neutrino-proton
scattering. We have computed the perturbative QCD corrections to three loops
for the harged current structure functions F_2, F_L and F_3 for the combination
nu P - nubar P. In leading twist approximation we have calculated the first six
odd-integer Mellin moments in the case of F_2 and F_L and the first six
even-integer moments in the case of F_3. As a new result we have obtained the
coefficient functions to O(alpha_s^3) and we have found the corresponding
anomalous dimensions to agree with known results in the literature.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:10:26 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Rogal",
"M.",
""
],
[
"Moch",
"S.",
""
]
] |
0706.3298 | Alexander Yampolsky | Alexander Yampolsky | On geodesics of Berger tangent sphere bundle of Hermitian locally
symmetric manifold | 13 pages | null | null | null | math.DG math.MG | null | We propose a special deformation of the Sasaki metric on tangent and unit
tangent bundle of a Hermitian locally symmetric manifold. Geodesics of this
deformed metric have different projections on a base manifold for tangent or
unit tangent bundle cases in contrast to usual Sasaki metric. Nevertheless, the
projections of geodesics of the unit tangent bundle still preserve the property
to have all geodesic curvatures constant.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:41:55 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Yampolsky",
"Alexander",
""
]
] |
0706.3299 | Mariel Saez | Mariel Saez Trumper | Relaxation of the flow of triods by Curve Shortening Flow via the
vector-valued parabolic Allen-Cahn equation | 20 pages, 2 figures | null | null | null | math.AP math.DG | null | In this paper we find solutions $u_\epsilon$ to a certain class of
vector-valued parabolic Allen-Cahn equation that as $\epsilon \to 0$ develops
as interface a given triod evolving under curve shortening flow.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 18:08:07 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Trumper",
"Mariel Saez",
""
]
] |
0706.3300 | Dmitri Fedorov V | M. Th{\o}gersen, D.V. Fedorov, and A.S. Jensen | Trapped Bose gases with large positive scattering length | null | EPL 79 (2007) 40002 | 10.1209/0295-5075/79/40002 | null | quant-ph cond-mat.quant-gas | null | We calculate the energy and the condensate fraction of a system of trapped
bosons interacting via a short-range two-body potential with positive
scattering length. The potential is attractive and has a two-body bound state.
When the scattering length is small compared to the trap length the system is
model independent: all potential models -- attractive, repulsive and zero-range
-- provide similar results. When the scattering length is large the attractive
model differs qualitatively from the repulsive and zero-range models. In this
regime the system with attractive potential becomes independent of the
scattering length, with both the energy and the condensate fraction converging
towards finite constants.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 09:43:14 GMT"
}
] | 2009-07-17T00:00:00 | [
[
"Thøgersen",
"M.",
""
],
[
"Fedorov",
"D. V.",
""
],
[
"Jensen",
"A. S.",
""
]
] |
0706.3301 | Joan Josep Ferrando | Joan Josep Ferrando and Juan Antonio S\'aez | On the invariant symmetries of the $\mathcal{D}$-metrics | 18 pages; v2: minor changes | J.Math.Phys.48:102504,2007 | 10.1063/1.2799264 | null | gr-qc | null | We analyze the symmetries and other invariant qualities of the
$\mathcal{D}$-metrics (type D aligned Einstein Maxwell solutions with
cosmological constant whose Debever null principal directions determine
shear-free geodesic null congruences). We recover some properties and deduce
new ones about their isometry group and about their quadratic first integrals
of the geodesic equation, and we analyze when these invariant symmetries
characterize the family of metrics. We show that the subfamily of the Kerr-NUT
solutions are those admitting a Papapetrou field aligned with the Weyl tensor.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 12:57:32 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 10:09:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ferrando",
"Joan Josep",
""
],
[
"Sáez",
"Juan Antonio",
""
]
] |
0706.3302 | Bart van Tiggelen | B.A. van Tiggelen | Zero-point momentum in Complex media | submitted to EPJ D | null | 10.1140/epjd/e2008-00027-1 | null | quant-ph | null | In this work we apply field regularization techniques to formulate a number
of new phenomena related to momentum induced by electromagnetic zero-point
fluctuations. We discuss the zero-point momentum associated with
magneto-electric media, with moving media, and with magneto-chiral media.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:05:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"van Tiggelen",
"B. A.",
""
]
] |
0706.3303 | Victor Abramovsky | A.V. Dmitriev, N.V.Radchenko | Soft colour interactions in hadron-hadron hard diffraction | 5 pages, 3 figures | null | null | null | hep-ph | null | SCI model gives a good and natural description of DDIS cross-sections.
Howevere, this model is pure phenomenological, and does not explain the nature
of soft color rearrangment. In this paper we argue, that the most capabilities
of SCI model can be derived from low constituent model and overview
applicability of low constituent model to DDIS processes.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:17:21 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Dmitriev",
"A. V.",
""
],
[
"Radchenko",
"N. V.",
""
]
] |
0706.3304 | Fabrizio Nesti | F. Nesti | Standard Model and Gravity from Spinors | 7 pages, added clarifications | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to unify the Gravity and Standard Model gauge groups by using
algebraic spinors of the standard four-dimensional Clifford algebra, in
left-right symmetric fashion. This generates exactly a Standard Model family of
fermions, and a Pati-Salam unification group emerges, at the Planck scale,
where (chiral) self-dual gravity decouples. As a remnant of the unification,
isospin-triplets spin-two particles may naturally appear at the weak scale,
providing a striking signal at the LHC.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:40:44 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Jun 2008 11:07:08 GMT"
}
] | 2008-06-20T00:00:00 | [
[
"Nesti",
"F.",
""
]
] |
0706.3305 | Ayan Mahalanobis | Ayan Mahalanobis | A simple generalization of the ElGamal cryptosystem to non-abelian
groups II | null | null | null | null | cs.CR math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a study of the MOR cryptosystem using the special linear group over
finite fields. The automorphism group of the special linear group is analyzed
for this purpose. At our current state of knowledge, I show that the MOR
cryptosystem has better security than the ElGamal cryptosystem over finite
fields.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:28:28 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jun 2007 16:41:57 GMT"
},
{
"version": "v3",
"created": "Sat, 29 Dec 2007 21:36:10 GMT"
},
{
"version": "v4",
"created": "Fri, 6 Mar 2009 19:09:55 GMT"
},
{
"version": "v5",
"created": "Tue, 25 Jan 2011 04:57:52 GMT"
}
] | 2011-01-26T00:00:00 | [
[
"Mahalanobis",
"Ayan",
""
]
] |
0706.3306 | Christian Bruun Madsen | C. B. Madsen and L. B. Madsen | Theoretical studies of high-harmonic generation: Effects of symmetry,
degeneracy and orientation | 9 pages, 6 figures, 1 table | Phys. Rev. A 76, 043419 (2007) | 10.1103/PhysRevA.76.043419 | null | physics.atom-ph | null | Using a quantum mechanical three-step model we present numerical calculations
on the high-harmonic generation from four polyatomic molecules. Ethylene
(C$_2$H$_4$) serves as an example where orbital symmetry directly affects the
harmonic yield. We treat the case of methane (CH$_4$) to address the
high-harmonic generation resulting from a molecule with degenerate orbitals. To
this end we illustrate how the single orbital contributions show up in the
total high-harmonic signal. This example illustrates the importance of adding
coherently amplitude contributions from the individual degenerate orbitals.
Finally, we study the high-harmonic generation from propane (C$_3$H$_8$) and
butane (C$_4$H$_{10}$). These two molecules, being extended and far from
spherical in structure, produce harmonics with non-trivial orientational
dependencies. In particular, propane can be oriented so that very
high-frequency harmonics are favorized, and thus the molecule contains
prospects for the generation of UV attosecond pulses.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:14:47 GMT"
}
] | 2007-10-20T00:00:00 | [
[
"Madsen",
"C. B.",
""
],
[
"Madsen",
"L. B.",
""
]
] |
0706.3307 | Fabrizio Nesti | F. Nesti, R. Percacci | Graviweak Unification | 18 pages, typos corrected and improved wording | J.Phys.A41:075405,2008 | 10.1088/1751-8113/41/7/075405 | null | hep-th | null | The coupling of chiral fermions to gravity makes use only of the selfdual
SU(2) subalgebra of the (complexified) SO(3,1) algebra. It is possible to
identify the antiselfdual subalgebra with the SU(2)_L isospin group that
appears in the Standard Model, or with its right-handed counterpart SU(2)_R
that appears in some extensions. Based on this observation, we describe a form
of unification of the gravitational and weak interactions. We also discuss
models with fermions of both chiralities, the inclusion strong interactions,
and the way in which these unified models of gravitational and gauge
interactions avoid conflict with the Coleman-Mandula theorem.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:36:52 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2007 16:26:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nesti",
"F.",
""
],
[
"Percacci",
"R.",
""
]
] |
0706.3308 | Emiliano Merlin | Emiliano Merlin and Cesare Chiosi | Simulating the formation and evolution of galaxies: Multi-phase
description of the interstellar medium, star formation, and energy feedback | 17 pages, 17 figures | null | 10.1051/0004-6361:20077465 | null | astro-ph | null | We present a multi-phase representation of the ISM in NB-TSPH simulations of
galaxy formation and evolution with particular attention to the case of
early-type galaxies. Cold gas clouds are described by the so-called sticky
particles algorithm. They can freely move throughout the hot ISM medium; stars
form within these clouds and the mass exchange among the three baryonic phases
(hot gas, cold clouds, stars) is governed by radiative and Compton cooling and
energy feedback by supernova (SN) explosions, stellar winds, and UV radiation.
We also consider thermal conduction, cloud-cloud collisions, and chemical
enrichment. Our model agrees with and improves upon previous studies on the
same subject. The results for the star formation rate are very promising and
agree with recent observational data on early-type galaxies. These models lend
further support to the revised monolithic scheme of galaxy formation, which has
recently been also strengthened by high redshift data leading to the so-called
downsizing and top-down scenarios.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 10:42:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Merlin",
"Emiliano",
""
],
[
"Chiosi",
"Cesare",
""
]
] |
0706.3309 | Mathieu Lewin | Maria J. Esteban (CEREMADE), Mathieu Lewin (AGM), Eric s\'er\'e
(CEREMADE) | Variational methods in relativistic quantum mechanics | null | Bull. Amer. Math. Soc. (N.S.) 45, 4 (2008) 535--593 | null | null | math-ph math.AP math.MP | null | This review is devoted to the study of stationary solutions of linear and
nonlinear equations from relativistic quantum mechanics, involving the Dirac
operator. The solutions are found as critical points of an energy functional.
Contrary to the Laplacian appearing in the equations of nonrelativistic quantum
mechanics, the Dirac operator has a negative continuous spectrum which is not
bounded from below. This has two main consequences. First, the energy
functional is strongly indefinite. Second, the Euler-Lagrange equations are
linear or nonlinear eigenvalue problems with eigenvalues lying in a spectral
gap (between the negative and positive continuous spectra). Moreover, since we
work in the space domain R^3, the Palais-Smale condition is not satisfied. For
these reasons, the problems discussed in this review pose a challenge in the
Calculus of Variations. The existence proofs involve sophisticated tools from
nonlinear analysis and have required new variational methods which are now
applied to other problems.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:06:30 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jan 2008 20:03:33 GMT"
}
] | 2008-10-27T00:00:00 | [
[
"Esteban",
"Maria J.",
"",
"CEREMADE"
],
[
"Lewin",
"Mathieu",
"",
"AGM"
],
[
"séré",
"Eric",
"",
"CEREMADE"
]
] |
0706.3310 | Sergey Lebedev G. | Sergey G.Lebedev | Josephson-Like Behaviour of Granular Carbon Films | 18 pages, 6 figures. The report will presented on the European
Conference on Applied Superconductivity (EUCAS2007) | Priroda, N8, p.38-44 (2007) | null | null | cond-mat.supr-con cond-mat.soft | null | This work presents the study of some new anomalous electromagnetic effects in
graphite-like thin carbon films. These are: The fast switching (1nanosecond) of
electrical conductivity The detection of microwave radiation and its
temperature dependence The oscillations of film stack magnetization in the
magnetic field of 1-5 T. The optical radiation under process of spasmodic
switching of conductivity Results of magnetic force microscopy (MFM), DC SQUID
magnetization, reversed Josephson effect (RJE), and resistance measurements in
thin carbon arc (CA) films are presented. The observation of a RJE induced
voltage as well as its rf frequency, input amplitude, and temperature
dependence reveals the existence of Josephson-like Junction arrays. Oscillating
behavior of the DC SQUID magnetization reminiscent of the Fraunhofer-like
behavior of superconducting (SC) critical current in the range of 10000-50000
Oe has been observed. The DC SQUID magnetization measurement indicates a
possible elementary 102 nm SC loop; this is compared to MFM direct observations
of magnetic clusters with a median size of 165 nm. The results obtained
provides a basis for non-cryogenic elecrtonic devices utilizing the Josephson
effect.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:20:05 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Lebedev",
"Sergey G.",
""
]
] |
0706.3311 | Michela Mapelli | M. Mapelli (1), E. Ripamonti (2), E. Tolstoy (2), S. Sigurdsson (3),
M. J. Irwin (4), G. Battaglia (2) ((1) University of Z\"urich, (2) Kapteyn
Astronomical Institute, University of Groningen, (3) Pennsylvania State
University, (4) Royal Greenwich Observatory) | Blue straggler stars in dwarf spheroidal galaxies | 16 pages, 10 figures, MNRAS, in press | null | 10.1111/j.1365-2966.2007.12148.x | null | astro-ph | null | Blue straggler star (BSS) candidates have been observed in all old dwarf
spheroidal galaxies (dSphs), however whether or not they are authentic BSSs or
young stars has been a point of debate. To both address this issue and obtain a
better understanding of the formation of BSSs in different environments we have
analysed a sample of BSS candidates in two nearby Galactic dSphs, Draco and
Ursa Minor. We have determined their radial and luminosity distributions from
wide field multicolour imaging data extending beyond the tidal radii of both
galaxies.
BSS candidates are uniformly distributed through the host galaxy, whereas a
young population is expected to show a more clumpy distribution. Furthermore,
the observed radial distribution of BSSs, normalized to both red giant branch
(RGB) and horizontal branch (HB) stars, is almost flat, with a slight decrease
towards the centre. Such a distribution is at odds with the predictions for a
young stellar population, which should be more concentrated. Instead, it is
consistent with model predictions for BSS formation by mass transfer in
binaries (MT-BSSs). Such results, although not decisive, suggest that these
candidates are indeed BSSs and that MT-BSSs form in the same way in Draco and
Ursa Minor as in globular clusters. This favours the conclusion that Draco and
Ursa Minor are truly 'fossil' galaxies, where star formation ceased completely
more than 8 billion years ago.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 15:06:05 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Jul 2007 12:03:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mapelli",
"M.",
""
],
[
"Ripamonti",
"E.",
""
],
[
"Tolstoy",
"E.",
""
],
[
"Sigurdsson",
"S.",
""
],
[
"Irwin",
"M. J.",
""
],
[
"Battaglia",
"G.",
""
]
] |
0706.3312 | Fabien Casse | Fabien Casse (APC), Zakaria Meliani (FOM Rijnhuizen) and C.Sauty
(LUTh) | Two-flow magnetohydrodynamical jets around young stellar objects | Accepted for publication in Astrophysics & Space Science. Referred
proceeding of the fifth Mont Stromlo Symposium Dec. 1-8 2006, Canberra,
Australia. 5 pages, 3 figures. For high resolution version of the paper,
please click here http://www.apc.univ-paris7.fr/~fcasse/publications.html | Astrophys.SpaceSci.311:57-61,2007 | 10.1007/s10509-007-9561-1 | null | astro-ph | null | We present the first-ever simulations of non-ideal magnetohydrodynamical
(MHD) stellar winds coupled with disc-driven jets where the resistive and
viscous accretion disc is self-consistently described. The transmagnetosonic,
collimated MHD outflows are investigated numerically using the VAC code. Our
simulations show that the inner outflow is accelerated from the central object
hot corona thanks to both the thermal pressure and the Lorentz force. In our
framework, the thermal acceleration is sustained by the heating produced by the
dissipated magnetic energy due to the turbulence. Conversely, the outflow
launched from the resistive accretion disc is mainly accelerated by the
magneto-centrifugal force. We also show that when a dense inner stellar wind
occurs, the resulting disc-driven jet have a different structure, namely a
magnetic structure where poloidal magnetic field lines are more inclined
because of the pressure caused by the stellar wind. This modification leads to
both an enhanced mass ejection rate in the disc-driven jet and a larger radial
extension which is in better agreement with the observations besides being more
consistent.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:48:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Casse",
"Fabien",
"",
"APC"
],
[
"Meliani",
"Zakaria",
"",
"FOM Rijnhuizen"
],
[
"Sauty",
"C.",
"",
"LUTh"
]
] |
0706.3313 | Konstantinos Drakakis | Konstantinos Drakakis, Rod Gow, Scott rickard | Parity properties of Costas arrays defined via finite fields | To appear in Advances in Mathematics of Communications | null | null | null | math.CO math.NT | null | A Costas array of order $n$ is an arrangement of dots and blanks into $n$
rows and $n$ columns, with exactly one dot in each row and each column, the
arrangement satisfying certain specified conditions. A dot occurring in such an
array is even/even if it occurs in the $i$-th row and $j$-th column, where $i$
and $j$ are both even integers, and there are similar definitions of odd/odd,
even/odd and odd/even dots. Two types of Costas arrays, known as Golomb-Costas
and Welch-Costas arrays, can be defined using finite fields. When $q$ is a
power of an odd prime, we enumerate the number of even/even odd/odd, even/odd
and odd/even dots in a Golomb-Costas array. We show that three of these numbers
are equal and they differ by $\pm 1$ from the fourth. For a Welch-Costas array
of order $p-1$, where $p$ is an odd prime, the four numbers above are all equal
to $(p-1)/4$ when $p\equiv 1\pmod{4}$, but when $p\equiv 3\pmod{4}$, we show
that the four numbers are defined in terms of the class number of the imaginary
quadratic field $\mathbb{Q}(\sqrt{-p})$, and thus behave in a much less
predictable manner.
| [
{
"version": "v1",
"created": "Fri, 22 Jun 2007 11:49:07 GMT"
}
] | 2007-06-25T00:00:00 | [
[
"Drakakis",
"Konstantinos",
""
],
[
"Gow",
"Rod",
""
],
[
"rickard",
"Scott",
""
]
] |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.