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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.4114 | Emmanuel Sauvan | E. Sauvan (on behalf of the H1 and ZEUS Collaborations) | Searches for New Physics at HERA | 5 pages, 5 figures; To appear in the proceedings of Hadron Collider
Physics Symposium 2007 (HCP2007), La Biodola, Isola d'Elba (Italy), May 20 -
26, 2007 | Nucl.Phys.Proc.Suppl.177-178:246-250,2008 | 10.1016/j.nuclphysbps.2007.11.117 | HCP07-proceedings | hep-ex | null | The high energy programme of the HERA collider ended in March 2007. During
the whole HERA programme, a combined total integrated luminosity of 1 fb$^{-1}$
was collected by the H1 and ZEUS experiments. In this context, an overview of
the most recent results of both experiments concerning searches for new physics
is presented. The topics covered are searches for contact interactions,
leptoquarks and excited leptons, as well as studies of the isolated lepton and
multi-lepton topologies, and a general signature based search.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 22:33:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sauvan",
"E.",
"",
"on behalf of the H1 and ZEUS Collaborations"
]
] |
0706.4115 | Scott Schnee | S. Schnee, P. Caselli, A. Goodman, H. G. Arce, J. Ballesteros-Paredes,
and K. Kuchibhotla | TMC-1C: an accreting starless core | 29 pages, including 5 tables and 15 figures | null | 10.1086/521577 | null | astro-ph | null | We have mapped the starless core TMC-1C in a variety of molecular lines with
the IRAM 30m telescope. High density tracers show clear signs of
self-absorption and sub-sonic infall asymmetries are present in N2H+ (1-0) and
DCO+ (2-1) lines. The inward velocity profile in N2H+ (1-0) is extended over a
region of about 7,000 AU in radius around the dust continuum peak, which is the
most extended ``infalling'' region observed in a starless core with this
tracer. The kinetic temperature (~12 K) measured from C17O and C18O suggests
that their emission comes from a shell outside the colder interior traced by
the mm continuum dust. The C18O (2-1) excitation temperature drops from 12 K to
~10 K away from the center. This is consistent with a volume density drop of
the gas traced by the C18O lines, from ~4x10^4 cm^-3 towards the dust peak to
~6x10^3 cm^-3 at a projected distance from the dust peak of 80" (or 11,000 AU).
The column density implied by the gas and dust show similar N2H+ and CO
depletion factors (f_D < 6). This can be explained with a simple scenario in
which: (i) the TMC-1C core is embedded in a relatively dense environment (H2
~10^4 cm^-3), where CO is mostly in the gas phase and the N2H+ abundance had
time to reach equilibrium values; (ii) the surrounding material (rich in CO and
N2H+) is accreting onto the dense core nucleus; (iii) TMC-1C is older than
3x10^5 yr, to account for the observed abundance of N2H+ across the core
(~10^-10 w.r.t. H2); and (iv) the core nucleus is either much younger (~10^4
yr) or ``undepleted'' material from the surrounding envelope has fallen towards
it in the past 10,000 yr.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 22:48:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schnee",
"S.",
""
],
[
"Caselli",
"P.",
""
],
[
"Goodman",
"A.",
""
],
[
"Arce",
"H. G.",
""
],
[
"Ballesteros-Paredes",
"J.",
""
],
[
"Kuchibhotla",
"K.",
""
]
] |
0706.4116 | Neal J. Evans II | Neal J. Evans II | Star Formation in Molecular Clouds? | 11 pages, 1 figure, ASP format, to be published in "Pathways Through
an Eclectic Universe", eds. J. Knapen, T. Mahoney, & A. Vazdekis | null | null | null | astro-ph | null | Using studies of nearby star formation with Spitzer, I will argue that star
formation is restricted to dense cores within molecular clouds. The nature of
these dense cores and their connection to star formation will be discussed.
Their distribution over masses and over the cloud is similar to that of stars,
and their efficiency of forming stars is much higher than that of the whole
cloud. Moving to regions forming more massive stars, we find that the mass
distribution of the dense clumps is similar to that of OB associations. The
infrared luminosity per unit mass of dense gas is high and comparable to that
seen in starburst galaxies. The relation between star formation and dense gas
appears to be linear. Understanding the Kennicutt-Schmidt law requires an
understanding of what controls the conversion of gas into the dense entities
where stars actually form.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 22:52:26 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Evans",
"Neal J.",
"II"
]
] |
0706.4117 | Stefano Moretti Dr | M. Moretti, S. Moretti, F. Piccinini, R. Pittau, J. Rathsman | Vector-Boson Production of Light Higgs Pairs in 2-Higgs Doublet Models | LaTeX, 25 pages, 11 Figures, 3 Tables, expanded discussion of
unitarity constraints, the calculational method and uncertainties in
background, accepted for publication in JHEP | JHEP0712:075,2007 | 10.1088/1126-6708/2007/12/075 | SHEP-07-11, FNT/T 2007-04 | hep-ph | null | At the Large Hadron Collider, we prove the feasibility to detect pair
production of the lightest CP-even Higgs boson $h$ of Type II 2-Higgs Doublet
Models through $q q^{(')}\to q q^{(')} {hh}$ (vector-boson fusion). We also
show that, through the $hh\to 4b$ decay channel in presence of heavy-flavour
tagging, further exploiting forward/backward jet sampling, one has direct
access to the $\lambda_{Hhh}$ triple Higgs coupling -- which constrains the
form of the Higgs potential.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 22:53:25 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 09:07:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Moretti",
"M.",
""
],
[
"Moretti",
"S.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Pittau",
"R.",
""
],
[
"Rathsman",
"J.",
""
]
] |
0706.4118 | Edriss Titi | Yanping Cao, Ziad H. Musslimani, Edriss S. Titi | Nonlinear Schrodinger-Helmholtz Equation as Numerical Regularization of
the Nonlinear Schrodinger Equation | null | null | 10.1088/0951-7715/21/5/001 | null | math.AP math-ph math.MP | null | A regularized $\alpha-$system of the Nonlinear Schr\"{o}dinger Equation (NLS)
with $2\sigma$ nonlinear power in dimension $N$ is studied. We prove existence
and uniqueness of local solution in the case $1 \le \sigma <\frac{4}{N-2}$ and
existence and uniqueness of global solution in the case $1 \le \sigma <
\frac{4}{N}$. When $\alpha \to 0^+$, this regularized system will converge to
the classical NLS in the appropriate range. In particular, the purpose of this
numerical regularization is to shed light on the profile of the blow up
solutions of the original Nonlinear Schr\"{o}dinger Equation in the range
$\frac{2}{N}\le \sigma <\frac{4}{N}$, and in particular for the critical case
$\sigma = \frac{2}{N}$.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 22:59:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cao",
"Yanping",
""
],
[
"Musslimani",
"Ziad H.",
""
],
[
"Titi",
"Edriss S.",
""
]
] |
0706.4119 | Eef van Beveren | Eef van Beveren and George Rupp | Relating multichannel scattering and production amplitudes in a
microscopic OZI-based model | 16 pages, 3 figures, plain LaTeX; | Annals Phys.323:1215-1229,2008 | 10.1016/j.aop.2007.11.012 | null | hep-ph | null | Relations between scattering and production amplitudes are studied in a
microscopic multichannel model for meson-meson scattering, with coupling to
confined quark-antiquark channels. Overlapping resonances and a proper
threshold behaviour are treated exactly in the model. Under the spectator
assumption, it is found that the two-particle production amplitude shares a
common denominator with the elastic scattering amplitude, besides a numerator
consisting of a linear combination of all elastic and some inelastic matrix
elements. The coefficients in these linear combinations are shown to be
generally complex. Finally, the standard operator expressions relating
production and scattering amplitudes, viz. A=T/V and Im(A)=T*A, are fulfilled,
while in the small-coupling limit the usual isobar model is recovered.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:19:59 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Oct 2007 12:51:23 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
0706.4120 | Andrea Alu | Andrea Alu, Nader Engheta | Optical 'Shorting Wires' | 13 pages, 4 figures, under review | null | 10.1364/OE.15.013773 | null | cond-mat.mtrl-sci | null | Connecting lumped circuit elements in a conventional circuit is usually
accomplished by conducting wires that act as conduits for the conduction
currents with negligible potential drops. More challenging, however, is to
extend these concepts to optical nanocircuit elements. Here, following our
recent development of optical lumped circuit elements, we show how a special
class of nanowaveguides formed by a thin core with relatively large (positive
or negative) permittivity surrounded by a thin concentric shell with low
permittivity may provide the required analogy to 'wires' for optical
nano-circuits.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 23:36:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alu",
"Andrea",
""
],
[
"Engheta",
"Nader",
""
]
] |
0706.4121 | Andrei Belitsky | A.V. Belitsky | Analytic Bethe Ansatz and Baxter equations for long-range psl(2|2) spin
chain | 32 pages, 2 figures | Nucl.Phys.B793:363-395,2008 | 10.1016/j.nuclphysb.2007.09.009 | null | hep-th | null | We study the largest particle-number-preserving sector of the dilatation
operator in maximally supersymmetric gauge theory. After exploring one-loop
Bethe Ansatze for the underlying spin chain with psl(2|2) symmetry for simple
root systems related to several Kac-Dynkin diagrams, we use the analytic Bethe
Anzats to construct eigenvalues of transfer matrices with finite-dimensional
atypical representations in the auxiliary space. We derive closed Baxter
equations for eigenvalues of nested Baxter operators. We extend these
considerations for a non-distinguished root system with FBBF grading to all
orders of perturbation theory in 't Hooft coupling. We construct generating
functions for all transfer matrices with auxiliary space determined by Young
supertableaux (1^a) and (s) and find determinant formulas for transfer matrices
with auxiliary spaces corresponding to skew Young supertableaux. The latter
yields fusion relations for transfer matrices with auxiliary space
corresponding to representations labelled by square Young supertableaux. We
derive asymptotic Baxter equations which determine spectra of anomalous
dimensions of composite Wilson operators in noncompact psl(2|2) subsector of
N=4 super-Yang-Mills theory.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 23:39:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Belitsky",
"A. V.",
""
]
] |
0706.4122 | Manolis K. Georgoulis | M. K. Georgoulis and Barry J. LaBonte | Magnetic Energy and Helicity Budgets in the Active-Region Solar Corona.
I. Linear Force-Free Approximation | 44 pages, 8 figures, 2 tables. The Astrophysical Journal, in press | null | 10.1086/521417 | null | astro-ph | null | We self-consistently derive the magnetic energy and relative magnetic
helicity budgets of a three-dimensional linear force-free magnetic structure
rooted in a lower boundary plane. For the potential magnetic energy we derive a
general expression that gives results practically equivalent to those of the
magnetic Virial theorem. All magnetic energy and helicity budgets are
formulated in terms of surface integrals applied to the lower boundary, thus
avoiding computationally intensive three-dimensional magnetic field
extrapolations. We analytically and numerically connect our derivations with
classical expressions for the magnetic energy and helicity, thus presenting a
so-far lacking unified treatment of the energy/helicity budgets in the
constant-alpha approximation. Applying our derivations to photospheric vector
magnetograms of an eruptive and a noneruptive solar active regions, we find
that the most profound quantitative difference between these regions lies in
the estimated free magnetic energy and relative magnetic helicity budgets. If
this result is verified with a large number of active regions, it will advance
our understanding of solar eruptive phenomena. We also find that the
constant-alpha approximation gives rise to large uncertainties in the
calculation of the free magnetic energy and the relative magnetic helicity.
Therefore, care must be exercised when this approximation is applied to
photospheric magnetic field observations. Despite its shortcomings, the
constant-alpha approximation is adopted here because this study will form the
basis of a comprehensive nonlinear force-free description of the energetics and
helicity in the active-region solar corona, which is our ultimate objective.
| [
{
"version": "v1",
"created": "Wed, 27 Jun 2007 23:39:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Georgoulis",
"M. K.",
""
],
[
"LaBonte",
"Barry J.",
""
]
] |
0706.4123 | Jason Kestner | J. P. Kestner, L.-M. Duan | Level crossing in the three-body problem for strongly interacting
fermions in a harmonic trap | 5 pages, 6 figures, typos corrected, references added | Phys. Rev. A 76, 033611 (2007) | 10.1103/PhysRevA.76.033611 | null | cond-mat.other | null | We present a solution of the three-fermion problem in a harmonic potential
across a Feshbach resonance. We compare the spectrum with that of the two-body
problem and show that it is energetically unfavorable for the three fermions to
occupy one lattice site rather than two. We also demonstrate the existence of
an energy level crossing in the ground state with a symmetry change of its wave
function, suggesting the possibility of a phase transition for the
corresponding many-body case.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 00:22:57 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 13:39:20 GMT"
}
] | 2007-09-26T00:00:00 | [
[
"Kestner",
"J. P.",
""
],
[
"Duan",
"L. -M.",
""
]
] |
0706.4124 | Qingwen Wu | Qingwen Wu (1,2,3), Feng Yuan (1,2) and Xinwu Cao (1,2) ((1)Shanghai
Astronomical Observatory, Chinese Academy of Sciences, Shanghai,
China;(2)Joint Institute for Galaxy and Cosmology (JOINGC) of SHAO and USMC;
(3)Graduate School of Chinese Academy of Sciences, Beijing) | On the origin of X-ray emission in some FR Is: ADAF or jet? | 31 pages, 8 figures, accepted for publication in ApJ | null | 10.1086/521212 | null | astro-ph | null | We investigate the X-ray origin in FR Is using the radio, submillimetre,
optical, and {\em Chandra} X-ray data of a small sample consisting of eight FR
I sources. These sources are very dim, with X-ray luminosities $L_{\rm
X}/L_{\rm Edd} \sim 10^{-4}-10^{-8}$ ($L_{\rm X}$ is the X-ray luminosity
between 2-10 keV). We try to fit the multiwaveband spectrum using a coupled
accretion-jet model. In this model, the accretion flow is described by an
advection-dominated accretion flow (ADAF) while in the innermost region of ADAF
a fraction of accretion flow is transferred into the vertical direction and
forms a jet. We find that X-ray emission in the source with the highest $L_{\rm
X}$ ($\sim 1.8 \times 10^{-4}L_{\rm Edd}$) is from the ADAF. The results for
the four sources with moderate $L_{\rm X}$ ($\sim$ several $\times
10^{-6}L_{\rm Edd}$) are complicated. Two are mainly from the ADAFs, one from
the jet, and the other from the sum of the jet and ADAF. The X-ray emission in
the three least luminous sources ($L_{\rm X} \lesssim 1.0\times 10^{-6}L_{\rm
Edd}$) is dominated by the jet although for one source it can also be
interpreted by the ADAF since the quality of X-ray data is low. We conclude
that these results roughly support the predictions of Yuan & Cui (2005) where
they predict that when the X-ray luminosity of the system is below a critical
value, the X-radiation will not be dominated by the emission from the ADAF any
longer, but by the jet. We also investigate the fuel supply in these sources.
We find that the accretion rates in four sources among the five in which we can
have good constraints to their accretion rates must be higher than the Bondi
rates. This implies that other fuel supply, such as the gas released by the
stellar population inside the Bondi radius, should be important.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 00:21:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wu",
"Qingwen",
""
],
[
"Yuan",
"Feng",
""
],
[
"Cao",
"Xinwu",
""
]
] |
0706.4125 | Noah Graham | N. Graham | Numerical Simulation of an Electroweak Oscillon | 12 pages, 8 figures, uses RevTeX4; v2: expanded results section,
fixed typos | Phys.Rev.D76:085017,2007 | 10.1103/PhysRevD.76.085017 | null | hep-th hep-lat hep-ph nlin.AO | null | Numerical simulations of the bosonic sector of the $SU(2)\times U(1)$
electroweak Standard Model in 3+1 dimensions have demonstrated the existence of
an oscillon -- an extremely long-lived, localized, oscillatory solution to the
equations of motion -- when the Higgs mass is equal to twice the $W^\pm$ boson
mass. It contains total energy roughly 30 TeV localized in a region of radius
0.05 fm. A detailed description of these numerical results is presented.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 00:47:04 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Oct 2007 00:53:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Graham",
"N.",
""
]
] |
0706.4126 | John Lawson | Charles W. Bauschlicher, Jr. and John W. Lawson | Current-voltage curves for molecular junctions: the effect of
substituents | null | Phys. Rev. B 75, 115406 (2007) | 10.1103/PhysRevB.75.115406 | null | cond-mat.mes-hall | null | We present current-voltage (I-V) curves for phenylene ethynylene oligomers
between two Au surfaces computed using a Density Functional Theory/Green's
Function approach. In addition to the parent molecule, two different
substituents are considered: one where all the hydrogens are replaced by
chlorines and a second where one H is replaced by an NO2 group. In this way, we
can study the difference between electron withdrawing and pi orbital effects.
For low biases, a reduced current for the derived species is consistent with a
shift of HOMO to lower energy due to the electron withdrawal by Cl or NO2. At
higher biases, the LUMO becomes important, and the Cl and NO2 substituted
species carry more current than the parent because the LUMO is stabilized
(shifted to lower energy) due to the withdrawal of electrons by the Cl and NO2.
In these molecules, the C2 bridging units as well as the thiol anchor group are
shown to create bottlenecks to current flow.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 00:38:36 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Bauschlicher,",
"Charles W.",
"Jr."
],
[
"Lawson",
"John W.",
""
]
] |
0706.4127 | Alfonso Agnew | Alfonso F. Agnew and Alain Bourget | Semiclassical Density of States for the Quantum Asymmetric Top | null | null | null | null | math-ph math.MP | null | In the quantization of a rotating rigid body, a {\it top,} one is concerned
with the Hamiltonian operator $L_\alpha=\alpha_0^2 L_x^2 + \alpha_1^2 L_y^2 +
\alpha_2^2 L_z^2,$ where $\alpha_0 < \alpha_1 <\alpha_2.$ An explicit formula
is known for the eigenvalues of $L_\alpha$ in the case of the spherical top
($\alpha_1 = \alpha_2 = \alpha_3$) and symmetrical top ($\alpha_1 = \alpha_2
\neq \alpha_3$) \cite{LL}. However, for the asymmetrical top, no such explicit
expression exists, and the study of the spectrum is much more complex. In this
paper, we compute the semiclassical density of states for the eigenvalues of
the family of operators $L_\alpha=\alpha_0^2 L_x^2 + \alpha_1^2 L_y^2 +
\alpha_2^2 L_z^2$ for any $\alpha_0 < \alpha_1 <\alpha_2$.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 00:39:49 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Agnew",
"Alfonso F.",
""
],
[
"Bourget",
"Alain",
""
]
] |
0706.4128 | Andrew Sullivan | A.L. Sullivan | A review of wildland fire spread modelling, 1990-present 2: Empirical
and quasi-empirical models | 22 pages + 7 pages references + 2 pages tables + 2 pages figures.
Submitted to International Journal of Wildland Fire | Sullivan, A. L. 2009. Wildland surface fire spread modelling,
1990-2007. 2: Empirical and quasi-empirical models. International Journal of
Wildland Fire 18, 369-386 | 10.1071/WF06142 | null | physics.geo-ph physics.ao-ph | null | In recent years, advances in computational power and spatial data analysis
(GIS, remote sensing, etc) have led to an increase in attempts to model the
spread and behaviour of wildland fires across the landscape. This series of
review papers endeavours to critically and comprehensively review all types of
surface fire spread models developed since 1990. This paper reviews models of
an empirical or quasi-empirical nature. These models are based solely on the
statistical analysis of experimentally obtained data with or without some
physical framework for the basis of the relations. Other papers in the series
review models of a physical or quasi-physical nature, and mathematical
analogues and simulation models. The main relations of empirical models are
that of wind speed and fuel moisture content with rate of forward spread.
Comparisons are made of the different functional relationships selected by
various authors for these variables.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 01:07:24 GMT"
}
] | 2010-07-28T00:00:00 | [
[
"Sullivan",
"A. L.",
""
]
] |
0706.4129 | W. David Kulp III | W. D. Kulp, J. L. Wood, P. E. Garrett, C. Y. Wu, D. Cline, J. M.
Allmond, D. Bandyopadhyay, D. Dashdorj, S. N. Choudry, A. B. Hayes, H. Hua,
S. R. Lesher, M. Mynk, M. T. McEllistrem, C. J. McKay, J. N. Orce, R. Teng,
S. W. Yates | Shape Coexistence and Mixing in 152Sm | 8 single-spaced, single-column pages, 4 figures, 1 table. Submitted
to Physical Review Letters | null | null | null | nucl-ex | null | Experimental studies of 152Sm using multiple-step Coulomb excitation and
inelastic neutron scattering provide key data that clarify the low-energy
collective structure of this nucleus. No candidates for two-phonon
beta-vibrational states are found. Experimental level energies of the
ground-state and first excited (0+ state) rotational bands, electric monopole
transition rates, reduced quadrupole transition rates, and the isomer shift of
the first excited 2+ state are all described within ~10% precision using
two-band mixing calculations. The basic collective structure of 152Sm is
described using strong mixing of near-degenerate coexisting quasi-rotational
bands with different deformations.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 01:24:24 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 20:18:10 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Kulp",
"W. D.",
""
],
[
"Wood",
"J. L.",
""
],
[
"Garrett",
"P. E.",
""
],
[
"Wu",
"C. Y.",
""
],
[
"Cline",
"D.",
""
],
[
"Allmond",
"J. M.",
""
],
[
"Bandyopadhyay",
"D.",
""
],
[
"Dashdorj",
"D.",
""
],
[
"Choudry",
"S. N.",
""
],
[
"Hayes",
"A. B.",
""
],
[
"Hua",
"H.",
""
],
[
"Lesher",
"S. R.",
""
],
[
"Mynk",
"M.",
""
],
[
"McEllistrem",
"M. T.",
""
],
[
"McKay",
"C. J.",
""
],
[
"Orce",
"J. N.",
""
],
[
"Teng",
"R.",
""
],
[
"Yates",
"S. W.",
""
]
] |
0706.4130 | Andrew Sullivan | A.L. Sullivan | A review of wildland fire spread modelling, 1990-present 3: Mathematical
analogues and simulation models | 20 pages + 9 pages references + 1 page figures. Submitted to the
International Journal of Wildland Fire | Sullivan, A. L. 2009. Wildland surface fire spread modelling,
1990-2007. 3: Simulation and mathematical analogue models. International
Journal of Wildland Fire, 18, 387-403 | 10.1071/WF06144 | null | physics.geo-ph physics.ao-ph | null | In recent years, advances in computational power and spatial data analysis
(GIS, remote sensing, etc) have led to an increase in attempts to model the
spread and behvaiour of wildland fires across the landscape. This series of
review papers endeavours to critically and comprehensively review all types of
surface fire spread models developed since 1990. This paper reviews models of a
simulation or mathematical analogue nature. Most simulation models are
implementations of existing empirical or quasi-empirical models and their
primary function is to convert these generally one dimensional models to two
dimensions and then propagate a fire perimeter across a modelled landscape.
Mathematical analogue models are those that are based on some mathematical
conceit (rather than a physical representation of fire spread) that
coincidentally simulates the spread of fire. Other papers in the series review
models of an physical or quasi-physical nature and empirical or quasi-empirical
nature. Many models are extensions or refinements of models developed before
1990. Where this is the case, these models are also discussed but much less
comprehensively.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 01:15:11 GMT"
}
] | 2010-07-28T00:00:00 | [
[
"Sullivan",
"A. L.",
""
]
] |
0706.4131 | Johan Andersson | Johan Andersson | On some power sum problems of Montgomery and Turan | v1: 9 pages; v2: Minor changes. Fixed error in last three lines of
proof of Theorem 2: v3: New title. Minor changes | null | null | null | math.NT | null | We use an estimate for character sums over finite fields of Katz to solve
open problems of Montgomery and Turan. Let h=>2 be an integer. We prove that
inf_{|z_k| => 1} max_{v=1,...,n^h} |sum_{k=1}^n z_k^v| <= (h-1+o(1)) sqrt n.
This gives the right order of magnitude for the quantity and improves on a
bound of Erdos-Renyi by a factor of the order sqrt log n.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:56:13 GMT"
},
{
"version": "v2",
"created": "Sat, 30 Jun 2007 00:03:44 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Jul 2007 15:43:00 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Andersson",
"Johan",
""
]
] |
0706.4132 | Farrukh A. Chishtie | F.A. Chishtie, T. Hanif, D.G.C. McKeon | Using the Renormalization Group Functions to Uniquely Determine the
Effective Potential in Massless Scalar Electrodynamics | Results of this work are now combined with findings in
arXiv:0706.1760. These results will appear in Phys. Rev. D 77, 065007 (2008).
As a result, this manuscript is being withdrawn | null | null | null | hep-th | null | It has been demonstrated that the effective potential V(\phi) in a massless
O(N) \lambda \phi^4_4 model is determined completely by the renormalization
group functions provided the renormalization condition \frac{d^4V}{d
\phi^4}|_{\phi=\mu}=\lambda is used. This is shown to also hold in massless
scalar electrodynamics. By employing a variant of the method of
characteristics, the sums contributing to the leading-log, next-to-leading-log
etc. contributions to V(\phi) can be evaluated.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 01:40:39 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 17:01:03 GMT"
}
] | 2008-03-12T00:00:00 | [
[
"Chishtie",
"F. A.",
""
],
[
"Hanif",
"T.",
""
],
[
"McKeon",
"D. G. C.",
""
]
] |
0706.4133 | Andrea Stolte | Andrea Stolte, Andrea M. Ghez, Mark Morris, Jessica R. Lu, Wolfgang
Brandner, Keith Matthews | The proper motion of the Arches cluster with Keck Laser-Guide Star
Adaptive Optics | 22 pdflatex pages including 12 figures, reviewed version accepted by
ApJ | null | 10.1086/527027 | null | astro-ph | null | We present the first measurement of the proper motion of the young, compact
Arches cluster near the Galactic center from near-infrared adaptive optics (AO)
data taken with the recently commissioned laser-guide star (LGS) at the Keck
10-m telescope. The excellent astrometric accuracy achieved with LGS-AO
provides the basis for a detailed comparison with VLT/NAOS-CONICA data taken
4.3 years earlier. Over the 4.3 year baseline, a spatial displacement of the
Arches cluster with respect to the field population is measured to be 24.0 +/-
2.2 mas, corresponding to a proper motion of 5.6 +/- 0.5 mas/yr or 212 +/- 29
km/s at a distance of 8 kpc. In combination with the known line-of-sight
velocity of the cluster, we derive a 3D space motion of 232 +/- 30 km/s of the
Arches relative to the field. The large proper motion of the Arches cannot be
explained with any of the closed orbital families observed in gas clouds in the
bar potential of the inner Galaxy, but would be consistent with the Arches
being on a transitional trajectory from x1 to x2 orbits. We investigate a
cloud-cloud collision as the possible origin for the Arches cluster. The
integration of the cluster orbit in the potential of the inner Galaxy suggests
that the cluster passes within 10 pc of the supermassive black hole only if its
true GC distance is very close to its projected distance. A contribution of
young stars from the Arches cluster to the young stellar population in the
inner few parsecs of the GC thus appears increasingly unlikely. The measurement
of the 3D velocity and orbital analysis provides the first observational
evidence that Arches-like clusters do not spiral into the GC. This confirms
that no progenitor clusters to the nuclear cluster are observed at the present
epoch.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 01:55:53 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Nov 2007 23:50:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stolte",
"Andrea",
""
],
[
"Ghez",
"Andrea M.",
""
],
[
"Morris",
"Mark",
""
],
[
"Lu",
"Jessica R.",
""
],
[
"Brandner",
"Wolfgang",
""
],
[
"Matthews",
"Keith",
""
]
] |
0706.4134 | Frank Sottile | Daniel J. Bates (IMA), Fr\'ed\'eric Bihan (Universit\'e de Savoie),
and Frank Sottile (Texas A&M) | Bounds on the number of real solutions to polynomial equations | 5 pages | null | null | null | math.AG | null | We use Gale duality for polynomial complete intersections and adapt the proof
of the fewnomial bound for positive solutions to obtain the bound (e^4+3) 2^(k
choose 2) n^k/4 for the number of non-zero real solutions to a system of n
polynomials in n variables having n+k+1 monomials whose exponent vectors
generate a subgroup of Z^n of odd index. This bound exceeds the bound for
positive solutions only by the constant factor (e^4+3)/(e^2+3) and it is
asymptotically sharp for k fixed and n large.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 02:03:02 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Oct 2007 21:34:27 GMT"
}
] | 2007-10-04T00:00:00 | [
[
"Bates",
"Daniel J.",
"",
"IMA"
],
[
"Bihan",
"Frédéric",
"",
"Université de Savoie"
],
[
"Sottile",
"Frank",
"",
"Texas A&M"
]
] |
0706.4135 | Masamichi Nishino | Masamichi Nishino, Kamel Boukheddaden, Yusuk\'e Konishi, and Seiji
Miyashita | Simple Two-Dimensional Model for the Elastic Origin of Cooperativity
among Spin States of Spin-Crossover Complexes | 4 pages, 4 figures | Phys. Rev. Lett. 98, 247203 (2007) | 10.1103/PhysRevLett.98.247203 | null | cond-mat.str-el cond-mat.stat-mech | null | We study the origin of the cooperative nature of spin crossover (SC) between
low spin (LS) and high spin (HS) states from the view point of elastic
interactions among molecules. As the size of each molecule changes depending on
its spin state, the elastic interaction among the lattice distortions provides
the cooperative interaction of the spin states. We develop a simple model of SC
with intra and intermolecular potentials which accounts for the elastic
interaction including the effect of the inhomogeneity of the spin states, and
apply constant temperature molecular dynamics based on the Nos\'e-Hoover
formalism. We demonstrate that, with increase of the strength of the
intermolecular interactions, the temperature dependence of the HS component
changes from a gradual crossover to a first-order transition.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 02:06:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nishino",
"Masamichi",
""
],
[
"Boukheddaden",
"Kamel",
""
],
[
"Konishi",
"Yusuké",
""
],
[
"Miyashita",
"Seiji",
""
]
] |
0706.4136 | Eric Howell Mr | E. Howell, D. Coward, R. Burman and D. Blair | An improved method for estimating source densities using the temporal
distribution of Cosmological Transients | Submitted to ApJ Letters | Astrophys.J.666:L65-L68,2007 | 10.1086/521709 | null | astro-ph | null | It has been shown that the observed temporal distribution of transient events
in the cosmos can be used to constrain their rate density. Here we show that
the peak flux--observation time relation takes the form of a power law that is
invariant to the luminosity distribution of the sources, and that the method
can be greatly improved by invoking time reversal invariance and the temporal
cosmological principle. We demonstrate how the method can be used to constrain
distributions of transient events, by applying it to Swift gamma-ray burst data
and show that the peak flux--observation time relation is in good agreement
with recent estimates of source parameters. We additionally show that the
intrinsic time dependence allows the method to be used as a predictive tool.
Within the next year of Swift observation, we find a 50% chance of obtaining a
peak flux greater than that of GRB 060017 -- the highest Swift peak flux to
date -- and the same probability of detecting a burst with peak flux > 100
photons s^{-1} cm^{-2} within 6 years.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 02:51:12 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Howell",
"E.",
""
],
[
"Coward",
"D.",
""
],
[
"Burman",
"R.",
""
],
[
"Blair",
"D.",
""
]
] |
0706.4137 | Christopher Gauthier | Ratindranath Akhoury and Christopher S. Gauthier | Propagation Constraints and Classical Solutions in K-essence Like
Theories | 10 pages, no figures | null | null | null | hep-th | null | We consider two examples of solutions of the equations of motion of scalar
field theories with higher derivatives. These are the cosmology of the rolling
tachyon and static spherically symmetric solutions of the scalar field in flat
space. By requiring that the field equations always be hyperbolic and that the
speed of propagation of the small fluctuations are not superluminal, we find
constraints on the form of the allowed interactions in the first case and on
the choice of boundary conditions in the latter. For the rolling tachyon we
find a general class of models which have the property that at large times the
tachyon matter behaves essentially like a non-relativistic gas of dust. For the
spherically symmetric solutions we show how causality influences the choice of
boundary conditions and those which are finite at the origin are shown to have
negative energy density there.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 02:52:53 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Akhoury",
"Ratindranath",
""
],
[
"Gauthier",
"Christopher S.",
""
]
] |
0706.4138 | Benjamin Recht | Benjamin Recht and Maryam Fazel and Pablo A. Parrilo | Guaranteed Minimum-Rank Solutions of Linear Matrix Equations via Nuclear
Norm Minimization | null | SIAM Review, Volume 52, Issue 3, pp. 471-501 (2010) | 10.1137/070697835 | null | math.OC math.ST stat.TH | null | The affine rank minimization problem consists of finding a matrix of minimum
rank that satisfies a given system of linear equality constraints. Such
problems have appeared in the literature of a diverse set of fields including
system identification and control, Euclidean embedding, and collaborative
filtering. Although specific instances can often be solved with specialized
algorithms, the general affine rank minimization problem is NP-hard. In this
paper, we show that if a certain restricted isometry property holds for the
linear transformation defining the constraints, the minimum rank solution can
be recovered by solving a convex optimization problem, namely the minimization
of the nuclear norm over the given affine space. We present several random
ensembles of equations where the restricted isometry property holds with
overwhelming probability. The techniques used in our analysis have strong
parallels in the compressed sensing framework. We discuss how affine rank
minimization generalizes this pre-existing concept and outline a dictionary
relating concepts from cardinality minimization to those of rank minimization.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 04:54:42 GMT"
}
] | 2010-08-09T00:00:00 | [
[
"Recht",
"Benjamin",
""
],
[
"Fazel",
"Maryam",
""
],
[
"Parrilo",
"Pablo A.",
""
]
] |
0706.4139 | Richard O'Shaughenssy | R. O'Shaughnessy (1), V. Kalogera (1), K. Belczynski (2) ((1)
Northwestern University, (2) New Mexico State University) | Short Gamma-Ray Bursts and Binary Mergers in Spiral and Elliptical
Galaxies: Redshift Distribution and Hosts | 14 figures, using bitmapped fonts (via eps2eps) to fit in archive
space restrictions; better resolution figures are available from the author.
Accepted for publication in ApJ. v3 updates references | Astrophys.J.675:566-585,2008 | 10.1086/526334 | null | astro-ph | null | To test whether the short GRB rates, redshift distribution and host galaxies
are consistent with current theoretical predictions, we use avery large
database of population synthesis calculations to examine BH-NS and NS-NS merger
rates in the universe, factoring in (i) the star formation history of the
universe, (ii) a heterogeneous population of star-forming galaxies, including
spirals and ellipticals, and (iii) a simple flux-limited selection model for
short GRB detection. When we require our models reproduce the known short GRB
rates and redshift measurements (and, for NS-NS, the merger rates extrapolated
from binary pulsars in the Galaxy), a small fraction of models reproduce all
observations, both when we assume a NS-NS and a BH-NS origin for bursts. Most
commonly models produce mergers preferentially in spiral galaxies if short GRBs
arise from NS-NS mergers alone. Model universes where present-day binary
mergers occur preferentially in elliptical galaxies necessarily include a
significant fraction of binaries with long delay times between birth and merger
(often $O(10{\rm Gyr})$). Though long delays occur, almost all of our models
predict that a higher proportion of short GRBs should occur at moderate to high
redshift (e.g., $z>1$) than has presently been observed, in agreement with
recent observations which suggest a selection bias towards successful follow-up
of low-redshift short GRBs. Finally, if only a fraction of BH-NS mergers have
the right combination of masses and spins to make GRBs, then at best only a
small fraction of BH-NS models could be consistent with all {\em current}
available data. (Abridged)
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 03:27:27 GMT"
},
{
"version": "v2",
"created": "Sun, 4 Nov 2007 20:03:03 GMT"
},
{
"version": "v3",
"created": "Mon, 26 Nov 2007 17:20:07 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"O'Shaughnessy",
"R.",
""
],
[
"Kalogera",
"V.",
""
],
[
"Belczynski",
"K.",
""
]
] |
0706.4140 | Qiu-he Peng | Hao Tong, Qiu-he Peng | Improbability of DUrca process constraints EOS | null | Chin.J.Astron.Astrophys.7:809,2007 | 10.1088/1009-9271/7/6/08 | null | astro-ph | null | According to recent observational and theoretical progresses, the DUrca
process (direct Urca process) may be excluded from the category of neutron star
cooling mechanisms. This result combined with the latest nuclear symmetry
energy experiments, will provide us an independent way of testing the EOS
(equation of state) for supranormal density. For example, soft EOSs such as FPS
will probably be excluded.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 03:35:26 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Dec 2007 01:05:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tong",
"Hao",
""
],
[
"Peng",
"Qiu-he",
""
]
] |
0706.4141 | Kristian McDonald | Kristian L. McDonald | Quark-Lepton Symmetry and Quartification in Five Dimensions | Talk given at the Festschrift in honour of Girish Joshi and Bruce
McKellar, to appear in a special edition of IJMPA | Int.J.Mod.Phys.A22:5023-5031,2007 | 10.1142/S0217751X07038372 | null | hep-ph | null | We outline some features of higher dimensional models possessing a
Quark-Lepton (QL) symmetry. The QL symmetric model in five dimensions is
discussed, with particular emphasis on the use of split fermions. An
interesting fermionic geography which utilises the QL symmetry to suppress the
proton decay rate and to motivate the flavor differences in the quark and
leptonic sectors is considered. We discuss the quartification model in five
dimensions and contrast the features of this model with traditional four
dimensional constructs.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 03:54:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"McDonald",
"Kristian L.",
""
]
] |
0706.4142 | Monica Forte | Luis Chimento and Monica Forte | Unified model of baryonic matter and dark components | 8 pages, 6 figures A new section added | Phys.Lett.B666:205-211,2008 | 10.1016/j.physletb.2008.07.064 | null | astro-ph hep-ph | null | We investigate an interacting two-fluid cosmological model and introduce a
scalar field representation by means of a linear combination of the individual
energy densities. Applying the integrability condition to the scalar field
equation we show that this "exotic quintessence" is driven by an exponential
potential and the two-fluid mixture can be considered as a model of three
components. These components are associated with baryonic matter, dark matter
and dark energy respectively. We use the Simon, Verde & Jimenez (2005)
determination of the redshift dependence of the Hubble parameter to constrain
the current density parameters of this model. With the best fit density
parameters we obtain the transition redshift between non accelerated and
accelerated regimes z_{acc}=0.66 and the time elapsed since the initial
singularity t_0= 19.8 Gyr. We study the perturbation evolution of this model
and find that the energy density perturbation decreases with the cosmological
time.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 04:28:59 GMT"
},
{
"version": "v2",
"created": "Tue, 27 May 2008 15:34:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chimento",
"Luis",
""
],
[
"Forte",
"Monica",
""
]
] |
0706.4143 | Jean-Luc Garden | Jean-Luc Garden (NEEL) | Macroscopic non-equilibrium thermodynamics in dynamic calorimetry | review article (21 pages) | Thermochimica Acta 452, Issue 2 (15/01/2007) 85-105 | 10.1016/j.tca.2006.08.017 | null | cond-mat.soft | null | What is really measured in dynamic calorimetric experiments is still an open
question. This paper is devoted to this question, which can be usefully
envisaged by means of macroscopic non-equilibrium thermodynamics. From the
pioneer work of De Donder on chemical reactions and with other authors along
the 20th century, the question is tackled under an historical point of view. A
special attention is paid about the notions of frequency dependent complex heat
capacity and entropy production due to irreversible processes occurring during
an experiment. This phenomenological approach based on thermodynamics, not
widely spread in the literature of calorimetry, could open significant
perspectives on the study of macro-systems undergoing physico-chemical
transformations probed by dynamic calorimetry.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 04:45:57 GMT"
}
] | 2007-07-15T00:00:00 | [
[
"Garden",
"Jean-Luc",
"",
"NEEL"
]
] |
0706.4144 | S. K. Roushon | S.K. Roushon | The Borel conjecture for manifolds with virtually solvable fundamental
groups | This paper has been withdrawn | null | null | null | math.GT math.KT | null | The article has been withdrawn by the author. Wolfgang Lueck and Peter
Linnell pointed out that the proof of Lemma 3.8 does not apply to the
unrestricted case of wreath product. It is not clear at this stage how to
complete the proof of Theorem 3.1 using the present version of Lemma 3.8. The
valid results originating from this article will be added in a later paper.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:57:21 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jul 2007 08:40:39 GMT"
}
] | 2007-07-19T00:00:00 | [
[
"Roushon",
"S. K.",
""
]
] |
0706.4145 | Surjeet Singh | Surjeet Singh (ICMMO), R. Suryanarayanan (ICMMO), R. Tackett, G.
Lawes, A. K. Sood, P. Berthet (ICMMO), A. Revcolevschi (ICMMO) | Ordered spin-ice state in the geometrically frustrated
metallic-ferromagnet Sm2Mo2O7 | null | null | 10.1103/PhysRevB.77.020406 | null | cond-mat.str-el cond-mat.mtrl-sci | null | The recent discovery of Spin-ice is a spectacular example of non-coplanar
spin arrangements that can arise in the pyrochlore A2B2O7 structure. We present
magnetic and thermodynamic studies on the metallic-ferromagnet pyrochlore
Sm2Mo2O7. Our studies, carried out on oriented crystals, suggest that the Sm
spins have an ordered spin-ice ground state below about T* = 15 K. The
temperature- and field-evolution of the ordered spin-ice state are governed by
an antiferromagnetic coupling between the Sm and Mo spins. We propose that as a
consequence of a robust feature of this coupling, the tetrahedra aligned with
the external field adopt a "1-in, 3-out" spin structure as opposed to "3-in,
1-out" in dipolar spin ices, as the field exceeds a critical value.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 04:51:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Singh",
"Surjeet",
"",
"ICMMO"
],
[
"Suryanarayanan",
"R.",
"",
"ICMMO"
],
[
"Tackett",
"R.",
"",
"ICMMO"
],
[
"Lawes",
"G.",
"",
"ICMMO"
],
[
"Sood",
"A. K.",
"",
"ICMMO"
],
[
"Berthet",
"P.",
"",
"ICMMO"
],
[
"Revcolevschi",
"A.",
"",
"ICMMO"
]
] |
0706.4146 | Hiroya Yamaguchi | Hiroya Yamaguchi, Katsuji Koyama, Satoru Katsuda, Hiroshi Nakajima,
John P. Hughes, Aya Bamba, Junko S. Hiraga, Koji Mori, Masanobu Ozaki, and
Takeshi Go Tsuru | X-Ray Spectroscopy of SN 1006 with Suzaku | 12 pages, 9 figures (14 figure files), accepted for publication in
PASJ | Publ. Astron. Soc. Japan (PASJ), Vol.60, S141, 2008 | 10.1093/pasj/60.sp1.S141 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on observations of SN 1006 with the X-ray Imaging Spectrometers
(XIS) on board Suzaku. We firmly detected K-shell emission from Fe, for the
first time, and find that the Fe ionization state is quite low. The broad band
spectrum extracted from the southeast of the remnant is well fitted with a
model consisting of three optically thin thermal non-equilibrium ionization
plasmas and a power-law component. Two of the thermal models are highly
overabundant in heavy elements and, hence, are likely due to ejecta. These
components have different ionization parameters: $n_et \sim 1.4\times 10^{10}$
cm$^{-3}$ s and $n_et \sim 7.7\times 10^8$ cm$^{-3}$ s and it is the later one
that produces the Fe-K emission. This suggests that Fe has been heated by the
reverse shock more recently than the other elements, consistent with a picture
where the ejecta are stratified by composition with Fe in the interior. On the
other hand, the third thermal component is assumed to be solar abundance, and
we associate it with emission from the interstellar medium (ISM). The electron
temperature and ionization parameter are $kT_e \sim $0.5 keV and $n_et \sim
5.8\times 10^9$ cm$^{-3}$ s. The electron temperature is lower than that
expected from the shock velocity which suggests a lack of collisionless
electron heating at the forward shock. The extremely low ionization parameter
and extreme non-equilibrium state are due to the low density of the ambient
medium.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 05:01:57 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Apr 2009 08:03:09 GMT"
}
] | 2017-01-18T00:00:00 | [
[
"Yamaguchi",
"Hiroya",
""
],
[
"Koyama",
"Katsuji",
""
],
[
"Katsuda",
"Satoru",
""
],
[
"Nakajima",
"Hiroshi",
""
],
[
"Hughes",
"John P.",
""
],
[
"Bamba",
"Aya",
""
],
[
"Hiraga",
"Junko S.",
""
],
[
"Mori",
"Koji",
""
],
[
"Ozaki",
"Masanobu",
""
],
[
"Tsuru",
"Takeshi Go",
""
]
] |
0706.4147 | Ruida Chen | Ruida Chen | Established pseudo solution of second-order Dirac-Coulomb equation with
position-dependent mass | 11 pages,no figure,52 equations | null | null | null | physics.gen-ph | null | We show that one of exact solutions of the second-order Dirac-Coulomb
equation were pseudo. In the corresponding original literature, it was
considered that the mass of the electron with a Coulomb potential was
position-dependent, but the obtained eigenvalues set was not the inevitable
mathematical deduction of the given second-order Dirac equation, and the
second-order Dirac equations were not the inevitable mathematical deduction of
the given couplet first-order Dirac equation with the position-dependent mass
of the electron. In the present paper, we obtain the correct solution of the
introduced first-order differential equations. This new solution would be
tenable only when the wave equation is correct, but there is not any experiment
date to validate the so-called position-dependent of the electron in the
Coulomb field.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:07:44 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 05:46:02 GMT"
},
{
"version": "v3",
"created": "Thu, 5 Jul 2007 08:50:43 GMT"
},
{
"version": "v4",
"created": "Fri, 13 Jul 2007 13:02:25 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Chen",
"Ruida",
""
]
] |
0706.4148 | Mil\'an Mosonyi | Fumio Hiai, Milan Mosonyi, Hiromichi Ohno, Denes Petz | Free energy density for mean field perturbation of states of a
one-dimensional spin chain | 29 pages, Section 5 added, to appear in Rev. Math. Phys | Rev. Math. Phys. 20, 335-365, (2008) | 10.1142/S0129055X08003298 | null | math-ph math.MP | null | Motivated by recent developments on large deviations in states of the spin
chain, we reconsider the work of Petz, Raggio and Verbeure in 1989 on the
variational expression of free energy density in the presence of a mean field
type perturbation. We extend their results from the product state case to the
Gibbs state case in the setting of translation-invariant interactions of finite
range. In the special case of a locally faithful quantum Markov state, we
clarify the relation between two different kinds of free energy densities (or
pressure functions).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 05:38:41 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Jan 2008 14:50:14 GMT"
}
] | 2009-12-09T00:00:00 | [
[
"Hiai",
"Fumio",
""
],
[
"Mosonyi",
"Milan",
""
],
[
"Ohno",
"Hiromichi",
""
],
[
"Petz",
"Denes",
""
]
] |
0706.4149 | Thomas Purdy | T.P. Purdy, D.M. Stamper-Kurn | Integrating cavity quantum electrodynamics and ultracold-atom chips with
on-chip dielectric mirrors and temperature stabilization | 5 pages, 4 figures, corrected typos in eq. 2 | null | 10.1007/s00340-007-2879-0 | null | quant-ph | null | We have fabricated an atom chip device which combines the circuitry for
magnetic trapping of cold atoms with high-finesse optical resonators suitable
for cavity QED in the single-atom strong coupling regime. Fabry-Perot optical
resonators with finesse F > 2 X 10^5 were formed between a micropatterned
on-chip planar mirror with lateral dimension of < 100 um and a curved mirror
suspended above the chip. The strong and rapid thermal coupling between on-chip
electrical and optical elements was utilized to stabilize the cavity mirror
separation with servo bandwidth exceeding 100 kHz during simulated operation of
the atom chip.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:04:14 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 18:01:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Purdy",
"T. P.",
""
],
[
"Stamper-Kurn",
"D. M.",
""
]
] |
0706.4150 | N Court | N. A. Court, A.J. Ferguson and R.G. Clark | Energy gap measurement of nanostructured thin aluminium films for use in
single Cooper-pair devices | null | Supercond. Sci. Technol. 21, 015013 (2008) | 10.1088/0953-2048/21/01/015013 | null | cond-mat.supr-con cond-mat.mes-hall | null | Within the context of superconducting gap engineering, Al-\alox-Al tunnel
junctions have been used to study the variation in superconducting gap,
$\Delta$, with film thickness. Films of thickness 5, 7, 10 and 30 nm were used
to form the small area superconductor-insulator-superconductor (SIS) tunnel
junctions. In agreement with previous measurements we have observed an increase
in the superconducting energy gap of aluminium with a decrease in film
thickness. In addition, we find grain size in small area films with thickness
\textbf{$\geq$} 10 nm has no appreciable effect on energy gap. Finally, we
utilize 7 and 30 nm films in a single Cooper-pair transistor, and observe the
modification of the finite bias transport processes due to the engineered gap
profile.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:29:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Court",
"N. A.",
""
],
[
"Ferguson",
"A. J.",
""
],
[
"Clark",
"R. G.",
""
]
] |
0706.4151 | Kazumasa Takeuchi | Kazumasa A. Takeuchi, Masafumi Kuroda, Hugues Chat\'e, and Masaki Sano | Directed percolation criticality in turbulent liquid crystals | 4 pages, 4 figures | Phys. Rev. Lett. 99, 234503 (2007). | 10.1103/PhysRevLett.99.234503 | null | cond-mat.stat-mech | null | We experimentally investigate the critical behavior of a phase transition
between two topologically different turbulent states of electrohydrodynamic
convection in nematic liquid crystals. The statistical properties of the
observed spatiotemporal intermittency regimes are carefully determined,
yielding a complete set of static critical exponents in full agreement with
those defining the directed percolation class in (2+1) dimensions. This
constitutes the first clear and comprehensive experimental evidence of an
absorbing phase transition in this prominent non-equilibrium universality
class.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:46:32 GMT"
}
] | 2008-01-14T00:00:00 | [
[
"Takeuchi",
"Kazumasa A.",
""
],
[
"Kuroda",
"Masafumi",
""
],
[
"Chaté",
"Hugues",
""
],
[
"Sano",
"Masaki",
""
]
] |
0706.4152 | Kazumasa Takeuchi | Kazumasa A. Takeuchi | Scaling of hysteresis loops at phase transitions into a quasiabsorbing
state | 4 pages, 4 figures, 1 table | Phys. Rev. E 77, 030103(R) (2008) | 10.1103/PhysRevE.77.030103 | null | cond-mat.stat-mech | null | Models undergoing a phase transition to an absorbing state weakly broken by
the addition of a very low spontaneous nucleation rate are shown to exhibit
hysteresis loops whose width $\Delta\lambda$ depends algebraically on the ramp
rate $r$. Analytical arguments and numerical simulations show that
$\Delta\lambda \sim r^{\kappa}$ with $\kappa = 1/(\beta'+1)$, where $\beta'$ is
the critical exponent governing the survival probability of a seed near
threshold. These results explain similar hysteresis scaling observed before in
liquid crystal convection experiments. This phenomenon is conjectured to occur
in a variety of other experimental systems.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:47:43 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 09:01:16 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Takeuchi",
"Kazumasa A.",
""
]
] |
0706.4153 | Filippo Palombi | Filippo Palombi, Mauro Papinutto, Carlos Pena, Hartmut Wittig | Non-perturbative renormalization of static-light four-fermion operators
in quenched lattice QCD | 33 pages, 7 figures | JHEP0709:062,2007 | 10.1088/1126-6708/2007/09/062 | null | hep-lat hep-ph | null | We perform a non-perturbative study of the scale-dependent renormalization
factors of a multiplicatively renormalizable basis of $\Delta{B}=2$ parity-odd
four-fermion operators in quenched lattice QCD. Heavy quarks are treated in the
static approximation with various lattice discretizations of the static action.
Light quarks are described by non-perturbatively ${\rm O}(a)$ improved
Wilson-type fermions. The renormalization group running is computed for a
family of Schroedinger functional (SF) schemes through finite volume techniques
in the continuum limit. We compute non-perturbatively the relation between the
renormalization group invariant operators and their counterparts renormalized
in the SF at a low energy scale. Furthermore, we provide non-perturbative
estimates for the matching between the lattice regularized theory and all the
SF schemes considered.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:45:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Palombi",
"Filippo",
""
],
[
"Papinutto",
"Mauro",
""
],
[
"Pena",
"Carlos",
""
],
[
"Wittig",
"Hartmut",
""
]
] |
0706.4154 | Yuichirou Sekiguchi | Yuichiro Sekiguchi and Masaru Shibata | A Formation Mechanism of Collapsar Black Hole -- early evolution phase | Figures are in low resolution | Prog.Theor.Phys.117:1029,2007 | 10.1143/PTP.117.1029 | null | astro-ph | null | The latest studies of massive star evolution indicate that an initially
rapidly rotating star with sufficiently low metallicity can produce a rapidly
rotating, massive stellar core that could be a progenitor of long-soft
gamma-ray bursts (LGRBs). Motivated by these studies, we follow the collapse of
a rapidly rotating massive stellar core to a 'collapsar' black hole (BH)
surrounded by a massive, hot accretion disk performing fully general
relativistic simulations. We focus on the general relativistic dynamics of the
collapse, and the relevant microphysics is treated in a qualitative manner. The
simulations are performed until the system consisting of the BH and the disk
has relaxed to a quasi-stationary state. A novel mechanism found in this study
is that strong shock waves are formed at the inner part of the disk after the
formation of the BH. These shock waves propagate mainly along the rotation
axis, heating the disk and sweeping materials around the rotational axis, and
thereby forming a low density region. The temperature of the disk is high
enough for copious neutrino emission. All these features indicate that the
direct formation of a rapidly rotating BH is a promising source of LGRBs even
in the absence of strong magnetic fields.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 06:54:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sekiguchi",
"Yuichiro",
""
],
[
"Shibata",
"Masaru",
""
]
] |
0706.4155 | Ulrich Hohenester | Ulrich Hohenester, Gernot Pfanner, Marek Seliger | Phonon-assisted decoherence in the production of polarization-entangled
photons in a single semiconductor quantum dot | 4 pages, 3 figure, to appear in Physical Review Letters | null | 10.1103/PhysRevLett.99.047402 | null | cond-mat.mes-hall | null | We theoretically investigate the production of polarization-entangled photons
through the biexciton cascade decay in a single semiconductor quantum dot. In
the intermediate state the entanglement is encoded in the polarizations of the
first emitted photon and the exciton, where the exciton state can be
effectively ``measured'' by the solid state environment through the formation
of a lattice distortion. We show that the resulting loss of entanglement
becomes drastically enhanced if the phonons contributing to the lattice
distortion are subject to elastic scatterings at the device boundaries, which
might constitute a serious limitation for quantum-dot based entangled-photon
devices.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 07:01:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hohenester",
"Ulrich",
""
],
[
"Pfanner",
"Gernot",
""
],
[
"Seliger",
"Marek",
""
]
] |
0706.4156 | Rim Dib | Rim Dib, Victoria M. Kaspi and Fotis P. Gavriil | Glitches in Anomalous X-ray Pulsars | 48 pages, 17 figures, 8 tables, To be published in ApJ (accepted) | AIPConf.Proc.983:239-243,2008 | 10.1063/1.2900151 | null | astro-ph | null | (Abridged) We report on 8.7 and 7.6 yr of RXTE observations of the Anomalous
X-ray Pulsars (AXPs) RXS J170849.0-400910 and 1E 1841-045, respectively. These
observations, part of a larger RXTE AXP monitoring program, have allowed us to
study the long-term timing, pulsed flux, and pulse profile evolution of these
objects. We report on four new glitches, one from RXS J170849.0-400910 and
three from 1E 1841-045. With nearly all known persistent AXPs now seen to
glitch, such behavior is clearly generic to this source class. We show that in
terms of fractional frequency change, AXPs are among the most actively
glitching neutron stars. However, in terms of absolute glitch amplitude, AXP
glitches are unremarkable. We show that the largest AXP glitches observed thus
far have recoveries that are unusual among those of radio pulsar glitches, with
the combination of recovery time scale and fraction yielding changes in
spin-down rates following the glitch similar to, or larger than, the long-term
average. We also observed a large long-term fractional increase in the
magnitude of the spin-down rate of 1E 1841-045 following its largest glitch.
These observations are challenging to interpret in standard glitch models, as
is the frequent occurence of large glitches given AXPs' high measured
temperatures. We speculate that the stellar core may be involved in the largest
AXP glitches. Furthermore, we show that AXP glitches appear to fall in two
classes: radiatively loud and radiatively quiet. The latter, of which the
glitches of J170849.0-400910 and 1E 1841-045 are examples, show little evidence
for an accompanying radiative event. We also show, however, that pulse profile
and pulsed flux changes are common in these AXPs, but do not apprear closely
correlated with any timing behavior.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 07:27:05 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Oct 2007 08:59:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dib",
"Rim",
""
],
[
"Kaspi",
"Victoria M.",
""
],
[
"Gavriil",
"Fotis P.",
""
]
] |
0706.4157 | Nicolas Champagnat | Nicolas Champagnat, Amaury Lambert (FESE) | Adaptive dynamics in logistic branching populations | null | Banach Center Publ., vol. 80 (2008) 235-244 | 10.4064/bc80-0-14 | null | math.PR | null | We consider a trait-structured population subject to mutation, birth and
competition of logistic type, where the number of coexisting types may
fluctuate. Applying a limit of rare mutations to this population while keeping
the population size finite leads to a jump process, the so-called `trait
substitution sequence', where evolution proceeds by successive invasions and
fixations of mutant types. The probability of fixation of a mutant is
interpreted as a fitness landscape that depends on the current state of the
population. It was in adaptive dynamics that this kind of model was first
invented and studied, under the additional assumption of large population.
Assuming also small mutation steps, adaptive dynamics' theory provides a
deterministic ODE approximating the evolutionary dynamics of the dominant trait
of the population, called `canonical equation of adaptive dynamics'. In this
work, we want to include genetic drift in this models by keeping the population
finite. Rescaling mutation steps (weak selection) yields in this case a
diffusion on the trait space that we call `canonical diffusion of adaptive
dynamics', in which genetic drift (diffusive term) is combined with directional
selection (deterministic term) driven by the fitness gradient. Finally, in
order to compute the coefficients of this diffusion, we seek explicit
first-order formulae for the probability of fixation of a nearly neutral mutant
appearing in a resident population. These formulae are expressed in terms of
`invasibility coefficients' associated with fertility, defense, aggressiveness
and isolation, which measure the robustness (stability w.r.t. selective
strengths) of the resident type. Some numerical results on the canonical
diffusion are also given.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 07:43:02 GMT"
}
] | 2011-12-05T00:00:00 | [
[
"Champagnat",
"Nicolas",
"",
"FESE"
],
[
"Lambert",
"Amaury",
"",
"FESE"
]
] |
0706.4158 | Soichiro Katayama | Soichiro Katayama and Hideo Kubo | Decay estimates of a tangential derivative to the light cone for the
wave equation and their application | 12 pages | SIAM J. Math. Anal. Vol.39 (2008), no.6, 1851-1862 | 10.1137/070694417 | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider wave equations in three space dimensions, and obtain new weighted
$L^\infty$-$L^\infty$ estimates for a tangential derivative to the light cone.
As an application, we give a new proof of the global existence theorem, which
was originally proved by Klainerman and Christodoulou, for systems of nonlinear
wave equations under the null condition. Our new proof has the advantage of
using neither the scaling nor the pseudo-rotation operators.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:29:47 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Aug 2009 06:35:07 GMT"
}
] | 2009-08-28T00:00:00 | [
[
"Katayama",
"Soichiro",
""
],
[
"Kubo",
"Hideo",
""
]
] |
0706.4159 | Anne Ersbak Bang Nielsen | Anne E. B. Nielsen and Klaus Molmer | Multimode analysis of the light emitted from a pulsed optical parametric
oscillator | 11 pages, 6 figures | Phys. Rev. A 76, 033832 (2007). | 10.1103/PhysRevA.76.033832 | null | quant-ph | null | We present a multimode treatment of the optical parametric oscillator, which
is valid for both pulsed and continuous-wave pump fields. The two-time
correlation functions of the output field are derived, and we apply the theory
to analyze a scheme for heralded production of non-classical field states that
may be subsequently stored in an atomic quantum memory.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 07:50:25 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 09:49:47 GMT"
}
] | 2007-09-30T00:00:00 | [
[
"Nielsen",
"Anne E. B.",
""
],
[
"Molmer",
"Klaus",
""
]
] |
0706.4160 | Dorel Fetcu D | D. Fetcu and C. Oniciuc | Explicit formulas for biharmonic submanifolds in Sasakian space forms | 17 pages | null | null | null | math.DG | null | We classify the biharmonic Legendre curves in a Sasakian space form, and
obtain their explicit parametric equations in the $(2n+1)$-dimensional unit
sphere endowed with the canonical and deformed Sasakian structures defined by
Tanno. Then, composing with the flow of the Reeb vector field, we transform a
biharmonic integral submanifold into a biharmonic anti-invariant submanifold.
Using this method we obtain new examples of biharmonic submanifolds in spheres
and, in particular, in $\mathbb{S}^{7}$.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:01:36 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Fetcu",
"D.",
""
],
[
"Oniciuc",
"C.",
""
]
] |
0706.4161 | Maurice Margenstern | Maurice Margenstern | The Domino Problem of the Hyperbolic Plane Is Undecidable | 18 pages, This is a synthesis of previous deposits | The Bulletin of EATCS, 93(Oct.), (2007), 220-237 | null | null | cs.CG cs.DM | null | In this paper, we prove that the general tiling problem of the hyperbolic
plane is undecidable by proving a slightly stronger version using only a
regular polygon as the basic shape of the tiles. The problem was raised by a
paper of Raphael Robinson in 1971, in his famous simplified proof that the
general tiling problem is undecidable for the Euclidean plane, initially proved
by Robert Berger in 1966.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:16:19 GMT"
}
] | 2008-04-19T00:00:00 | [
[
"Margenstern",
"Maurice",
""
]
] |
0706.4162 | Naomichi Hatano | Masashi Fujinaga and Naomichi Hatano (IIS, U. Tokyo) | The entanglement of the XY spin chain in a random magnetic field | 8 pages, to appear in J. Phys. Soc. Jpn | J. Phys. Soc. Jpn. 76 (2007) 094001 | 10.1143/JPSJ.76.094001 | null | quant-ph cond-mat.dis-nn cond-mat.stat-mech | null | We investigate the entanglement of the ferromagnetic XY model in a random
magnetic field at zero temperature and in the uniform magnetic field at finite
temperatures. We use the concurrence to quantify the entanglement. We find
that, in the ferromagnetic region of the uniform magnetic field $h$, all the
concurrences are \textit{generated} by the random magnetic field and by the
thermal fluctuation. In one particular region of $h$, the next-nearest neighbor
concurrence is generated by the random field but not at finite temperatures. We
also find that the qualitative behavior of the maximum point of the
entanglement in the random magnetic field depends on whether the variance of
its distribution function is finite or not.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:16:30 GMT"
}
] | 2007-09-27T00:00:00 | [
[
"Fujinaga",
"Masashi",
"",
"IIS, U. Tokyo"
],
[
"Hatano",
"Naomichi",
"",
"IIS, U. Tokyo"
]
] |
0706.4163 | Z. Ya. Turakulov | A. T. Muminov | Variational Principles for Constrained Electromagnetic Field and
Papapetrou Equation | 14 pages. submitted to Zeitschrift fuer Naturforschung | null | null | null | gr-qc | null | In our previous article [4] an approach to derive Papapetrou equations for
constrained electromagnetic field was demonstrated by use of field variational
principles. The aim of current work is to present more universal technique of
deduction of the equations which could be applied to another types of
non-scalar fields. It is based on Noether theorem formulated in terms of
Cartan' formalism of orthonormal frames. Under infinitesimal coordinate
transformation the one leads to equation which includes volume force of
spin-gravitational interaction. Papapetrou equation for vector of propagation
of the wave is derived on base of the equation. Such manner of deduction allows
to formulate more accurately the constraints and clarify equations for the
potential and for spin.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:17:29 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Muminov",
"A. T.",
""
]
] |
0706.4164 | Davar Khoshnevisan | Davar Khoshnevisan and Yimin Xiao | Harmonic analysis of additive Levy processes | submitted; 54 pages | null | null | null | math.PR | null | Let $X_1,...,X_N$ denote $N$ independent $d$-dimensional L\'evy processes,
and consider the $N$-parameter random field \[\X(\bm{t}):=
X_1(t_1)+...+X_N(t_N).\] First we demonstrate that for all nonrandom Borel sets
$F\subseteq\R^d$, the Minkowski sum $\X(\R^N_+)\oplus F$, of the range
$\X(\R^N_+)$ of $\X$ with $F$, can have positive $d$-dimensional Lebesgue
measure if and only if a certain capacity of $F$ is positive. This improves our
earlier joint effort with Yuquan Zhong \ycite{KXZ:03} by removing a
symmetry-type condition there. Moreover, we show that under mild regularity
conditions, our necessary and sufficient condition can be recast in terms of
one-potential densities. This rests on developing results in classical
[non-probabilistic] harmonic analysis that might be of independent interest. As
was shown in \fullocite{KXZ:03}, the potential theory of the type studied here
has a large number of consequences in the theory of L\'evy processes. We
present a few new consequences here.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:23:38 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Khoshnevisan",
"Davar",
""
],
[
"Xiao",
"Yimin",
""
]
] |
0706.4165 | Dmitry Zhuridov Dr. | A. Ali, A.V. Borisov, D.V. Zhuridov | Probing new physics in the Neutrinoless double beta decay using electron
angular correlation | 37 pages, 5 figures; crucial error in Appendix A is corrected that
reveals higher significance of the scalar part due to the P-wave effect, the
updates match Erratum submitted to PRD. arXiv admin note: text overlap with
arXiv:hep-ph/0606072 | Phys.Rev.D76:093009,2007 | 10.1103/PhysRevD.76.093009 | DESY 07-097 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angular correlation of the electrons emitted in the neutrinoless double
beta decay ($0\nu2\beta$) is presented using a general Lorentz invariant
effective Lagrangian for the leptonic and hadronic charged weak currents. We
show that the coefficient $K$ in the angular correlation $d\Gamma/d\cos \theta
\propto (1-K\cos \theta)$ is essentially independent of the nuclear matrix
element models and present its numerical values for the five nuclei of interest
($^{76}{Ge}$, $^{82}{Se}$, $^{100}{Mo}$, $^{130}{Te}$, and $^{136}{Xe}$),
assuming that the $0\nu2\beta$-decays in these nuclei are induced solely by a
light Majorana neutrino, $\nu_M$. This coefficient varies between $K=0.81$ (for
the $^{76}{Ge}$ nucleus) and $K=0.88$ (for the $^{82}{Se}$ and $^{100}{Mo}$
nuclei), calculated taking into account the effects from the nucleon recoil,
the $S$ and $P$-waves for the outgoing electrons and the electron mass.
Deviation of $K$ from its values derived here would indicate the presence of
New Physics (NP) in addition to a light Majorana neutrino, and we work out the
angular coefficients in several $\nu_M + {NP}$ scenarios for the $^{76}{Ge}$
nucleus. As an illustration of the correlations among the $0\nu2\beta$
observables (half-life $T_{1/2}$, the coefficient $K$, and the effective
Majorana neutrino mass $|< m>|$) and the parameters of the underlying NP model,
we analyze the left-right symmetric models, taking into account current
phenomenological bounds on the right-handed $W_R$-boson mass and the left-right
mixing parameter $\zeta$.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:42:53 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 15:31:18 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Jan 2008 16:27:13 GMT"
},
{
"version": "v4",
"created": "Sat, 23 Apr 2022 06:55:36 GMT"
}
] | 2022-04-26T00:00:00 | [
[
"Ali",
"A.",
""
],
[
"Borisov",
"A. V.",
""
],
[
"Zhuridov",
"D. V.",
""
]
] |
0706.4166 | Raghavan Rangarajan | Raghavan Rangarajan | WMAPping the Inflationary Universe | 6 pages; Invited talk at the 17th DAE-BRNS High Energy Physics
Symposium at the Indian Institute of Technology, Kharagpur, December 11-15,
2006 | null | null | null | hep-ph astro-ph | null | An epoch of accelerated expansion, or inflation, in the early universe solves
several cosmological problems. While there are many models of inflation only
recently has it become possible to discriminate between some of the models
using observations of the cosmic microwave background radiation and large-scale
structure. In this talk, we discuss inflation and its observational
consequences, and then the status of current cosmological observations and
their implications for different models of inflation.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:49:32 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Rangarajan",
"Raghavan",
""
]
] |
0706.4167 | Minzu Wang | J.-T. Wei, M.-Z. Wang, et al | Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+ | 15 pages, 5 figures (14 figure files), revisions to Phys. Lett. B | Phys.Lett.B659:80-86,2008 | 10.1016/j.physletb.2007.11.063 | Belle Preprint 2007-26, KEK Preprint 2007-15 | hep-ex | null | We study the characteristics of the low mass ppbar enhancements near
threshold in the three-body decays B+ to p pbar K+ and B+ to p pbar pi+. We
observe that the proton polar angle distributions in the ppbar helicity frame
in the two decays have the opposite polarity, and measure the forward-backward
asymmetries as a function of the ppbar mass for the p pbar K+ mode. We also
search for the intermediate two-body decays, B+ to pbar Delta++ and B+ to p
Delta0bar, and set upper limits on their branching fractions. These results are
obtained from a 414 fb^{-1} data sample that contains 449 times 10^6 BBbar
events collected near the Upsilon(4S) resonance with the Belle detector at the
KEKB asymmetric-energy e+ e- collider.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 08:51:12 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 10:35:34 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Oct 2007 09:48:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wei",
"J. -T.",
""
],
[
"Wang",
"M. -Z.",
""
]
] |
0706.4168 | Rudra Prakash Malik | R. P. Malik (BHU and SISSA) | Symmetry invariance, anticommutativity and nilpotency in BRST approach
to QED: superfield formalism | LaTeX file, 18 pages, journal version | J. Phys. Math. 3: 2011, P110503 | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide the geometrical interpretation for the Becchi-Rouet-Stora-Tyutin
(BRST) and anti-BRST symmetry invariance of the Lagrangian density of a four (3
+ 1)-dimensional (4D) interacting U(1) gauge theory within the framework of
superfield approach to BRST formalism. This interacting theory, where there is
an explicit coupling between the U(1) gauge field and matter (Dirac) fields, is
considered on a (4, 2)-dimensional supermanifold parametrized by the four
spacetime variables x^\mu (\mu = 0, 1, 2, 3) and a pair of Grassmannian
variables \theta and \bar\theta (with \theta^2 = \bar \theta^2 = 0, \theta
\bar\theta + \bar \theta \theta = 0$). We express the Lagrangian density and
(anti-)BRST charges in the language of the superfields and show that (i) the
(anti-)BRST invariance of the 4D Lagrangian density is equivalent to the
translation of the super Lagrangian density along the Grassmannian direction(s)
(\theta and/or \bar\theta) of the (4, 2)-dimensional supermanifold such that
the outcome of the above translation(s) is zero, and (ii) the anticommutativity
and nilpotency of the (anti-)BRST charges are the automatic consequences of our
superfield formulation.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:01:47 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 12:37:02 GMT"
},
{
"version": "v3",
"created": "Thu, 4 Aug 2011 06:50:31 GMT"
},
{
"version": "v4",
"created": "Thu, 17 Nov 2011 07:00:59 GMT"
}
] | 2011-11-18T00:00:00 | [
[
"Malik",
"R. P.",
"",
"BHU and SISSA"
]
] |
0706.4169 | Domenico Marinucci | P. Baldi, G. Kerkyacharian, D. Marinucci, D. Picard | Subsampling needlet coefficients on the sphere | Published in at http://dx.doi.org/10.3150/08-BEJ164 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm) | Bernoulli 2009, Vol. 15, No. 2, 438-463 | 10.3150/08-BEJ164 | IMS-BEJ-BEJ164 | math.ST astro-ph math.PR stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, we analyzed the properties of a new kind of spherical
wavelets (called needlets) for statistical inference procedures on spherical
random fields; the investigation was mainly motivated by applications to
cosmological data. In the present work, we exploit the asymptotic uncorrelation
of random needlet coefficients at fixed angular distances to construct
subsampling statistics evaluated on Voronoi cells on the sphere. We illustrate
how such statistics can be used for isotropy tests and for bootstrap estimation
of nuisance parameters, even when a single realization of the spherical random
field is observed. The asymptotic theory is developed in detail in the high
resolution sense.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:06:36 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Jun 2009 07:27:41 GMT"
}
] | 2009-06-12T00:00:00 | [
[
"Baldi",
"P.",
""
],
[
"Kerkyacharian",
"G.",
""
],
[
"Marinucci",
"D.",
""
],
[
"Picard",
"D.",
""
]
] |
0706.4170 | Alessandro Mirone | Alessandro Mirone | Hilbert++ Manual | null | null | null | null | cs.OH cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here an installation guide, a hand-on mini-tutorial through
examples, and the theoretical foundations of the Hilbert++ code.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:09:55 GMT"
},
{
"version": "v2",
"created": "Sun, 1 Mar 2009 09:03:37 GMT"
}
] | 2009-03-03T00:00:00 | [
[
"Mirone",
"Alessandro",
""
]
] |
0706.4171 | Arthur Chernin | A.D. Chernin, I.D. Karachentsev, O.G. Kashibadze, D.I. Makarov, P.
Teerikorpi, M.J. Valtonen, V.P. Dolgachev, L.M. Domozhilova | Local dark energy: HST evidence from the vicinity of the M 81/M 82
galaxy group | 17 pages, 1 figure | Astrophys.50:405-415,2007 | 10.1007/s10511-007-0038-2 | null | astro-ph | null | The Hubble Space Telescope observations of the nearby galaxy group M 81/M 82
and its vicinity indicate that the expansion outflow around the group is
dominated by the antigravity of the dark energy background. The local density
of dark energy in the area is estimated to be near the global dark energy
density or perhaps exactly equal to it. This conclusion agrees with our
previous results for the Local group vicinity and the vicinity of the Cen A/M
83 group.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:10:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chernin",
"A. D.",
""
],
[
"Karachentsev",
"I. D.",
""
],
[
"Kashibadze",
"O. G.",
""
],
[
"Makarov",
"D. I.",
""
],
[
"Teerikorpi",
"P.",
""
],
[
"Valtonen",
"M. J.",
""
],
[
"Dolgachev",
"V. P.",
""
],
[
"Domozhilova",
"L. M.",
""
]
] |
0706.4172 | Eduardo Mart\'inez | T.K. Yamada, E. Martinez, A. Vega, R. Robles, D. Stoeffler, A.L.
Vazquez de Parga, T. Mizoguchi and H. van Kempen | Spin configuration in a frustrated ferromagnetic/antiferromagnetic thin
film system | 10 pages, 5 figures | Nanotechnology 18, 235702 (2007) | 10.1088/0957-4484/18/23/235702 | null | cond-mat.mtrl-sci | null | We have studied the magnetic configuration in ultrathin antiferromagnetic Mn
films grown around monoatomic steps on an Fe(001) surface by spin-polarized
scanning tunneling microscopy/spectroscopy and ab-initio-parametrized
self-consistent real-space tight binding calculations in which the spin
quantization axis is independent for each site thus allowing noncollinear
magnetism. Mn grown on Fe(001) presents a layered antiferromagnetic structure.
In the regions where the Mn films overgrows Fe steps the magnetization of the
surface layer is reversed across the steps. Around these defects a frustration
of the antiferromagnetic order occurs. Due to the weakened magnetic coupling at
the central Mn layers, the amount of frustration is smaller than in Cr and the
width of the wall induced by the step does not change with the thickness, at
least for coverages up to seven monolayers.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:23:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamada",
"T. K.",
""
],
[
"Martinez",
"E.",
""
],
[
"Vega",
"A.",
""
],
[
"Robles",
"R.",
""
],
[
"Stoeffler",
"D.",
""
],
[
"de Parga",
"A. L. Vazquez",
""
],
[
"Mizoguchi",
"T.",
""
],
[
"van Kempen",
"H.",
""
]
] |
0706.4173 | Benjamin Grinstein | Benjamin Grinstein | FPCP Theory Overview | Talk presented at Flavor Physics & CP Violation Conference, Bled,
2007; latex, 7 pp | ECONFC070512:005,2007 | null | fpcp07_123; UCSD-PTH-07-08 | hep-ph | null | We first review some aspects of the determination of the sides and angles of
the unitarity triangle. We pay particular attention to theory shortcomings, and
present many alternative proposals for the determination of |Vub| (which at
present is problematic). We then turn our attention to the more general
question: What have we learned so far about flavor physics and where do we go
from here? We argue that the aim of Flavor Physics should be to establish or
rule out Minimal Flavor Violating interactions up to a scale of 10 TeV.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:53:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grinstein",
"Benjamin",
""
]
] |
0706.4174 | Davide Marenduzzo | D. Marenduzzo, E. Orlandini, M. E. Cates, J. M. Yeomans | Lattice Boltzmann simulations of spontaneous flow in active liquid
crystals: the role of boundary conditions | 17 pages, 6 figures, accepted for publication in J. non-Newt. Fluid
Mech | null | null | null | cond-mat.soft cond-mat.stat-mech | null | Active liquid crystals or active gels are soft materials which can be
physically realised e.g. by preparing a solution of cytoskeletal filaments
interacting with molecular motors. We study the hydrodynamics of an active
liquid crystal in a slab-like geometry with various boundary conditions, by
solving numerically its equations of motion via lattice Boltzmann simulations.
In all cases we find that active liquid crystals can sustain spontaneous flow
in steady state contrarily to their passive counterparts, and in agreement with
recent theoretical predictions. We further find that conflicting anchoring
conditions at the boundaries lead to spontaneous flow for any value of the
'activity' parameter, while with unfrustrated anchoring at all boundaries
spontaneous flow only occurs when the activity exceeds a critical threshold. We
finally discuss the dynamic pathway leading to steady state in a few selected
cases.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:56:26 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Marenduzzo",
"D.",
""
],
[
"Orlandini",
"E.",
""
],
[
"Cates",
"M. E.",
""
],
[
"Yeomans",
"J. M.",
""
]
] |
0706.4175 | Cedric Adjih | Song Yean Cho (INRIA Rocquencourt), C\'edric Adjih (INRIA
Rocquencourt), Philippe Jacquet (INRIA Rocquencourt) | Heuristics for Network Coding in Wireless Networks | null | null | null | null | cs.NI | null | Multicast is a central challenge for emerging multi-hop wireless
architectures such as wireless mesh networks, because of its substantial cost
in terms of bandwidth. In this report, we study one specific case of multicast:
broadcasting, sending data from one source to all nodes, in a multi-hop
wireless network. The broadcast we focus on is based on network coding, a
promising avenue for reducing cost; previous work of ours showed that the
performance of network coding with simple heuristics is asymptotically optimal:
each transmission is beneficial to nearly every receiver. This is for
homogenous and large networks of the plan. But for small, sparse or for
inhomogeneous networks, some additional heuristics are required. This report
proposes such additional new heuristics (for selecting rates) for broadcasting
with network coding. Our heuristics are intended to use only simple local
topology information. We detail the logic of the heuristics, and with
experimental results, we illustrate the behavior of the heuristics, and
demonstrate their excellent performance.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 09:56:50 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 12:24:12 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Cho",
"Song Yean",
"",
"INRIA Rocquencourt"
],
[
"Adjih",
"Cédric",
"",
"INRIA\n Rocquencourt"
],
[
"Jacquet",
"Philippe",
"",
"INRIA Rocquencourt"
]
] |
0706.4176 | Abolfazl Bayat | Abolfazl Bayat, Sugato Bose | Entanglement Transfer Through an Antiferromagnetic Spin Chain | 5 pages, 5 figures. Modified version with more explanation | Advances in Mathematical Physics, Vol: 2010, 127182 (2010) | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of using an uniformly coupled finite
antiferromagnetic spin-1/2 Heisenberg chain as a channel for transmitting
entanglement. One member of a pair of maximally entangled spins is initially
appended to one end of a chain in its ground state and the dynamical
propagation of this entanglement to the other end is calculated. We show that
compared to the analogous scheme with a ferromagnetic chain in its ground
state, here the entanglement is transmitted faster, with less decay, with a
much higher purity and as a narrow pulse form rising non-analytically from
zero. Here non-zero temperatures and depolarizing environments are both found
to be less destructive in comparison to the ferromagnetic case. The
entanglement is found to propagate through the chain in a peculiar fashion
whereby it hops to skip alternate sites.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:07:05 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 19:09:20 GMT"
},
{
"version": "v3",
"created": "Tue, 20 Oct 2009 20:59:48 GMT"
},
{
"version": "v4",
"created": "Mon, 1 Feb 2010 13:00:09 GMT"
}
] | 2010-02-01T00:00:00 | [
[
"Bayat",
"Abolfazl",
""
],
[
"Bose",
"Sugato",
""
]
] |
0706.4177 | Stefan Maubach | Stefan Maubach | \C-flows A^z of linear maps A expressed in terms of
A^{-1},A^{-2},...,A^{-n} and analytic functions of z | null | null | null | null | math.AC math.AG math.CV | null | Suppose A\in GL_n(\C) has a relation A^p=c_{p-1}A^{p-1}+.... + c_1 A+ c_0I
where the c_i in \C. This article describes how to construct analytic functions
c_i(z) such that A^z=c_{p-1}(z)A^{p-1}+... + c_1(z) A+ c_0(z)I . One of the
theorems gives a possible description of the c_i(z): c_i(z)=C^z\alpha where
C\in Mat_p(\C) is (similar to) the companion matrix of X^p-c_{p-1}X^{p-1}-...
-c_1X-c_0I, and \alpha:= (c_{p-1},...,c_1,c_0)^t.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:07:51 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Maubach",
"Stefan",
""
]
] |
0706.4178 | Jaron Treutlein | Jaron Treutlein | Lattice polytopes of degree 2 | 8 pages | null | null | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A theorem of Scott gives an upper bound for the normalized volume of lattice
polygons with exactly $i>0$ interior lattice points. We will show that the same
bound is true for the normalized volume of lattice polytopes of degree 2 even
in higher dimensions. In particular, there is only a finite number of quadratic
polynomials with fixed leading coefficient being the $h^*$-polynomial of a
lattice polytope.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:11:34 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 09:59:14 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Jan 2009 08:45:48 GMT"
}
] | 2009-01-13T00:00:00 | [
[
"Treutlein",
"Jaron",
""
]
] |
0706.4179 | Benjamin Grinstein | Benjamin Grinstein | Overview: Sides of the Unitarity Triangle | Talk presented at 4th International Workshop on the CKM Unitarity
Triangle, December 12-16, 2006, Nagoya, Japan; latex, 6 pp | null | null | UCSD-PTH-07-06 | hep-ph | null | This is an opening talk for the workshop and is intended to be provocative.
We take a stab at the following questions: How well do we really know the sides
of the unitarity triangle? What else could we do to improve? (I propose several
new measurements). What precision should we ultimately aim at in the
determination of CKM elements? What have we learned so far about flavor
physics? Where do we go from here?
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:12:54 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Grinstein",
"Benjamin",
""
]
] |
0706.4180 | Daegene Song | Daegene Song | Universal Grammar and Consciousness | 4 pages, 6 figures | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The orthodox interpretation of quantum theory treats the subject and the
object on an equal footing. It has been suggested that the cyclical-time
process, which resolves self-reference in consciousness, interconnects the
observed universe and the mind of the subject. Based on the analogy between
cryptography and language, the concept of the common innate structure of
language, also known as universal grammar, may be associated with the
continuity in consciousness. Extending this connection, Levi-Strauss's proposal
on universal culture may be considered as a shared structure of continuity
among the consciousness of multiple subjects.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:13:37 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2019 08:11:08 GMT"
}
] | 2019-01-08T00:00:00 | [
[
"Song",
"Daegene",
""
]
] |
0706.4181 | Xavier Le Breton | Xavier Le Breton | A characterization property on field equivalent to algebraicity on
Banach spaces | null | null | null | null | math.NT math.LO | null | In his article "A discrete form of the theorem that each field endomorphism
of $\mathbb{R}$ ($\mathbb{Q}_p$) is the identity", Tyszka introduce a logical
property which is equivalent to algebraicity in $\mathbb{R}$ and in
$\mathbb{Q}_p$. Amazingly, the property is no longer equivalent to algebraicity
in $\mathbb{C}$. This article present a similirar property which is equivalent
to algebraicity in any field of characteristic zero which is also a Banach
space, and prove a weaker equivalency for fields of positive charcteristic
(which are also Banach spaces).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:01:29 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Breton",
"Xavier Le",
""
]
] |
0706.4182 | David d'Enterria | David d'Enterria | Experimental tests of small-x QCD | Invited talk at "42th Rencontres de Moriond-QCD" (La Thuile, Apr.'07)
and at "9th Workshop on non-perturbative QCD" (Paris, June'07). 6 pages, 4
figs. Figure 1b corrected | ECONF C0706044:17,2007 | null | null | hep-ex nucl-ex nucl-th | null | Current and future experimental studies of the high-energy limit of QCD,
dominated by non-linear gluon dynamics in the low-x sector of the hadron
wavefunctions, are presented. Results at HERA (proton) and RHIC (nucleus)
pointing to the possible onset of parton saturation phenomena, and perspectives
at the LHC and new proposed DIS facilities are outlined.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:14:50 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 22:35:02 GMT"
},
{
"version": "v3",
"created": "Wed, 25 Jul 2007 09:42:58 GMT"
}
] | 2009-05-13T00:00:00 | [
[
"d'Enterria",
"David",
""
]
] |
0706.4183 | Stefan Maubach | Stefan Maubach | Infinitely generated Derksen and Makar-Limanov invariant | Accepted to Osaka J. Math | null | null | null | math.AG math.AC | null | In this paper, we give an example of a finitely generated 3-dimensional
C-algebra which has infinitely generated Derksen invariant as well as
Makar-Limaonv invariant.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:15:16 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Maubach",
"Stefan",
""
]
] |
0706.4184 | Stefan Maubach | David Finston, Stefan Maubach | Constructing (almost) rigid rings and a UFD having infinitely generated
Derksen and Makar-Limanov invariant | Accepted to Canad. Math. Bull | null | null | null | math.AG math.AC | null | An example is given of a UFD which has infinitely generated Derksen
invariant. The ring is \textquotedblleft almost rigid\textquotedblright\
meaning that the Derksen invariant is equal to the Makar-Limanov invariant.
Techniques to show that a ring is (almost) rigid are discussed, among which is
a generalization of Mason's abc-theorem.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:20:05 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Finston",
"David",
""
],
[
"Maubach",
"Stefan",
""
]
] |
0706.4185 | Benjamin Grinstein | Benjamin Grinstein | Minimal Flavor Violation | Talk presented at the 4th International Workshop on the CKM Unitarity
Triangle, December 12-16, 2006, Nagoya, Japan; latex, 4 pp | null | null | UCSD-PTH-07-07 | hep-ph | null | If new physics is called upon to explain away fine tunings, like the
hierarchy problem, then, we argue, the principle of Minimal Flavor Violation is
inescapable. We review the principle and recent extensions to the lepton sector
and to Grand-Unified theories.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:25:07 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Grinstein",
"Benjamin",
""
]
] |
0706.4186 | Badri Dvalishvili | B. P. Dvalishvili | Zero-Bidimension and Various Classes of Bitopological Spaces | 35 pages | null | null | null | math.GN | null | The sum theorem and its corollaries are proved for a countable family of
zero-dimensional (in the sense of small and large inductive bidimensions)
p-closed sets, using a new notion of relative normality whose topological
correspondent is also new. The notion of almost $n$-dimensionality is
considered from the bitopological point of view.
Bitopological spaces in which every subset is i-open in its $j$-closure
(i.e.,(i,j)-submaximal spaces) are introduced and their properties are studied.
Based on the investigations begun in [5] and [14], sufficient conditions are
found for bitopological spaces to be(1,2)-Baire in the class of p-normal
spaces. Furthermore, (i,j)-I-spaces are introduced and both the relations
between(i,j)-submaximal, (i,j)-nodec and (i,j)-I-spaces, and their properties
are studied when two topologies on a set are either independent of each other
or interconnected by the inclusion, S-, C- and N-relations or by their
combinations.
The final part of the paper deals with the questions of preservation of
$(i,j)$-submaximal and $(2,1)\dd I$-spaces to an image, of $D$-spaces to an
image and an inverse image for both the topological and the bitopological
cases. Two theorems are formulated containing, on the one hand, topological
conditions and, on the other hand, bitopological ones, under which a
topological space is a $D$-space.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:23:40 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Dvalishvili",
"B. P.",
""
]
] |
0706.4187 | Stefan Maubach | David Finston, Stefan Maubach | The Automorphism Group of Certain Factorial Threefolds and a
Cancellation Problem | To appear in Isr. J. Math | null | null | null | math.AG math.AC | null | The automorphism groups of certain factorial complex affine threefolds
admitting locally trivial actions of the additive group are determined. As a
consequence new counterexamples to a generalized cancellation problem are
obtained.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:26:41 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Finston",
"David",
""
],
[
"Maubach",
"Stefan",
""
]
] |
0706.4188 | Sumit Das | Sumit R. Das | Holography and Cosmological Singularities | Anomaly equation corrected. References added | Int.J.Mod.Phys.A22:5638-5655,2007 | 10.1142/S0217751X0703889X | UK/07-02 | hep-th | null | Certain null singularities in ten dimensional supergravity have natural
holographic duals in terms of Matrix Theory and generalizations of the AdS/CFT
correspondence. In many situations the holographic duals appear to be well
defined in regions where the supergravity develops singularities. We describe
some recent progress in this area.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:30:11 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 14:43:06 GMT"
},
{
"version": "v3",
"created": "Tue, 20 Nov 2007 13:17:56 GMT"
}
] | 2010-11-03T00:00:00 | [
[
"Das",
"Sumit R.",
""
]
] |
0706.4189 | Xiaoping Xu | Xiaoping Xu | Stable-Range Approach to the Equation of Nonstationary Transonic Gas
Flows | 19pages,accepted by Quarterly of Applied Mathematics | null | null | null | physics.flu-dyn math-ph math.AP math.MP nlin.SI | null | Using certain finite-dimensional stable range of the nonlinear terms, we
obtain large families of exact solutions parameterized by functions for the
equation of nonstationary transonic gas flows discovered by Lin, Reisner and
Tsien, and its three-dimensional generalization.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:34:03 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Xu",
"Xiaoping",
""
]
] |
0706.4190 | Cheolwoo Park | Vitaliana Rondonotti, J. S. Marron, Cheolwoo Park | SiZer for time series: A new approach to the analysis of trends | Published at http://dx.doi.org/10.1214/07-EJS006 in the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2007, Vol. 1, 268-289 | 10.1214/07-EJS006 | IMS-EJS-EJS_2007_6 | stat.ME | null | Smoothing methods and SiZer are a useful statistical tool for discovering
statistically significant structure in data. Based on scale space ideas
originally developed in the computer vision literature, SiZer (SIgnificant ZERo
crossing of the derivatives) is a graphical device to assess which observed
features are `really there' and which are just spurious sampling artifacts. In
this paper, we develop SiZer like ideas in time series analysis to address the
important issue of significance of trends. This is not a straightforward
extension, since one data set does not contain the information needed to
distinguish `trend' from `dependence'. A new visualization is proposed, which
shows the statistician the range of trade-offs that are available. Simulation
and real data results illustrate the effectiveness of the method.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:39:45 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Rondonotti",
"Vitaliana",
""
],
[
"Marron",
"J. S.",
""
],
[
"Park",
"Cheolwoo",
""
]
] |
0706.4191 | Ritesh Singh K. | Abdelhak Djouadi, Gregory Moreau, Ritesh K. Singh | Kaluza--Klein excitations of gauge bosons at the LHC | 31 pages, 9 figures, usages axodraw.sty (included) | Nucl.Phys.B797:1-26,2008 | 10.1016/j.nuclphysb.2007.12.024 | LPT-Orsay 07-45 | hep-ph | null | We consider the Randall-Sundrum extra dimensional model with fields
propagating in the bulk based on an extended electroweak gauge symmetry with
specific fermion charges and localizations that allow to explain the LEP
anomaly of the forward--backward asymmetry for $b$--quarks, $A_{FB}^b$. We
study the manifestations of the strongly--interacting and electroweak gauge
boson Kaluza--Klein excitations $\vkk$ at the LHC, with masses of the order of
a few TeV, which dominantly decays into top and bottom quark pairs. We first
analyze the two--body tree--level production processes $pp \to t\bar t$ and
$b\bar b$ in which the Kaluza--Klein (KK) excitations of gauge bosons are
exchanged. We find that the additional channels can lead to a significant
excess of events with respect to the Standard Model prediction; characteristic
top quark polarization and angular asymmetries are quantitatively studied and
turn out to probe the chiral structure of couplings to excited states. We then
analyze higher order production processes for the gauge boson excitations which
have too weak or no couplings to light quarks and, in particular, the loop
induced process $gg \to \vkk \to t\bar t$ and $b\bar b$ in which the anomalous
$gg \vkk $ four--dimensional vertex has to be regulated. The RS effects in this
process, as well as in the four--body reactions $pp \to t\bar t b\bar b$,
$t\bar t t\bar t$, $b\bar b b\bar b$ and in the related three--body reactions
$gb \to b t \bar t$, $b b\bar b$, in which the $\vkk$ excitations are mainly
radiated off the eavy quarks, are shown to be potentially difficult to test at
LHC, due to small hase space and low parton density for $\mkk \gsim 3$ TeV.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:41:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Djouadi",
"Abdelhak",
""
],
[
"Moreau",
"Gregory",
""
],
[
"Singh",
"Ritesh K.",
""
]
] |
0706.4192 | Viktor Ivanov | V.A.Ivanov, E.A.An, L.A.Spirin, M.R.Stukan, M. Mueller, W.Paul,
K.Binder | Equation of State for Macromolecules of Variable Flexibility in Good
Solvents: A Comparison of Techniques for Monte Carlo Simulations of Lattice
Models | 32 pages, 18 figures, submitted to Phys.Rev.E; one paragraph added to
conclusions section | null | 10.1103/PhysRevE.76.026702 | null | cond-mat.soft | null | The osmotic equation of state for the athermal bond fluctuation model on the
simple cubic lattice is obtained from extensive Monte Carlo simulations. For
short macromolecules (chain length N=20) we study the influence of various
choices for the chain stiffness on the equation of state. Three techniques are
applied and compared in order to critically assess their efficiency and
accuracy: the repulsive wall method, the thermodynamic integration method
(which rests on the feasibility of simulations in the grand canonical
ensemble), and the recently advocated sedimentation equilibrium method, which
records the density profile in an external (e.g. gravitation-like) field and
infers, via a local density approximation, the equation of state from the
hydrostatic equilibrium condition. We confirm the conclusion that the latter
technique is far more efficient than the repulsive wall method, but we find
that the thermodynamic integration method is similarly efficient as the
sedimentation equilibrium method. For very stiff chains the onset of nematic
order enforces the formation of isotropic-nematic interface in the
sedimentation equilibrium method leading to strong rounding effects and
deviations from the true equation of state in the transition regime.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:44:50 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 10:18:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ivanov",
"V. A.",
""
],
[
"An",
"E. A.",
""
],
[
"Spirin",
"L. A.",
""
],
[
"Stukan",
"M. R.",
""
],
[
"Mueller",
"M.",
""
],
[
"Paul",
"W.",
""
],
[
"Binder",
"K.",
""
]
] |
0706.4193 | Arnaud Guillin | Arnaud Guillin (LATP), Christian Leonard (CMAP, MODAL'X), Liming Wu,
Nian Yao | Transportation-information inequalities for Markov processes | null | Probability Theory and Related Fields 144, 3-4 (2009) 669-695 | null | null | math.PR math.FA | null | In this paper, one investigates the following type of
transportation-information $T_cI$ inequalities: $\alpha(T_c(\nu,\mu))\le
I(\nu|\mu)$ for all probability measures $\nu$ on some metric space $(\XX, d)$,
where $\mu$ is a given probability measure, $T_c(\nu,\mu)$ is the
transportation cost from $\nu$ to $\mu$ with respect to some cost function
$c(x,y)$ on $\XX^2$, $I(\nu|\mu)$ is the Fisher-Donsker-Varadhan information of
$\nu$ with respect to $\mu$ and $\alpha: [0,\infty)\to [0,\infty]$ is some left
continuous increasing function. Using large deviation techniques, it is shown
that $T_cI$ is equivalent to some concentration inequality for the occupation
measure of a $\mu$-reversible ergodic Markov process related to $I(\cdot|\mu)$,
a counterpart of the characterizations of transportation-entropy inequalities,
recently obtained by Gozlan and L\'eonard in the i.i.d. case . Tensorization
properties of $T_cI$ are also derived.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:50:35 GMT"
}
] | 2010-04-13T00:00:00 | [
[
"Guillin",
"Arnaud",
"",
"LATP"
],
[
"Leonard",
"Christian",
"",
"CMAP, MODAL'X"
],
[
"Wu",
"Liming",
""
],
[
"Yao",
"Nian",
""
]
] |
0706.4194 | Aaron Hammack | A.T. Hammack, L.V. Butov, L. Mouchliadis, A.L. Ivanov, A.C. Gossard | Kinetics of indirect excitons in the optically-induced exciton trap | 4 pages, 3 figures | Phys. Rev. B 76, 193308 (2007) | 10.1103/PhysRevB.76.193308 | null | cond-mat.mes-hall | null | We report on the kinetics of a low-temperature gas of indirect excitons in
the optically-induced exciton trap. The excitons in the region of laser
excitation are found to rapidly -- within 4 ns -- cool to the lattice
temperature T = 1.4 K, while the excitons at the trap center are found to be
cold -- essentially at the lattice temperature -- even during the excitation
pulse. The loading time of excitons to the trap center is found to be about 40
ns, longer than the cooling time yet shorter than the lifetime of the indirect
excitons. The observed time hierarchy is favorable for creating a dense and
cold exciton gas in optically-induced traps and for in situ control of the gas
by varying the excitation profile in space and time before the excitons
recombine.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:49:03 GMT"
}
] | 2010-03-22T00:00:00 | [
[
"Hammack",
"A. T.",
""
],
[
"Butov",
"L. V.",
""
],
[
"Mouchliadis",
"L.",
""
],
[
"Ivanov",
"A. L.",
""
],
[
"Gossard",
"A. C.",
""
]
] |
0706.4195 | Xiaoping Xu | Xiaoping Xu | Flag Partial Differential Equations and Representations of Lie Algebras | 30pages | null | null | null | math.RT math-ph math.AP math.MP nlin.SI | null | In this paper, we solve the initial value problems of variable-coefficient
generalized wave equations associated with trees and a large family of linear
constant-coefficient partial differential equation by algebraic methods.
Moreover, we find all the polynomial solutions for a 3-dimensional
variable-coefficient flag partial differential equation of any order, the
linear wave equation with dissipation and the generalized anisymmetrical
Laplace equation. Furthermore, the polynomial-trigonometric solutions of a
generalized Klein-Gordan equation associated with 3-dimensional generalized
Tricomi operator $\ptl_x^2+x\ptl_y^2+y\ptl_z^2$ are also given. As applications
to representations of Lie algebras, we find certain irreducible polynomial
representations of the Lie algebras $sl(n,\mbb{F}), so(n,\mbb{F})$ and the
simple Lie algebra of type $G_2$.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:57:14 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Xu",
"Xiaoping",
""
]
] |
0706.4196 | N. I. Stoilova | S. Lievens, N. I. Stoilova, J. Van der Jeugt | The paraboson Fock space and unitary irreducible representations of the
Lie superalgebra osp(1|2n) | typos corrected | Commun.Math.Phys.282:575,2008 | 10.1007/s00220-008-0567-5 | null | hep-th math-ph math.GR math.MP math.RT quant-ph | null | It is known that the defining relations of the orthosymplectic Lie
superalgebra osp(1|2n) are equivalent to the defining (triple) relations of n
pairs of paraboson operators $b^\pm_i$. In particular, with the usual star
conditions, this implies that the ``parabosons of order p'' correspond to a
unitary irreducible (infinite-dimensional) lowest weight representation V(p) of
osp(1|2n). Apart from the simple cases p=1 or n=1, these representations had
never been constructed due to computational difficulties, despite their
importance. In the present paper we give an explicit and elegant construction
of these representations V(p), and we present explicit actions or matrix
elements of the osp(1|2n) generators. The orthogonal basis vectors of V(p) are
written in terms of Gelfand-Zetlin patterns, where the subalgebra u(n) of
osp(1|2n) plays a crucial role. Our results also lead to character formulas for
these infinite-dimensional osp(1|2n) representations. Furthermore, by
considering the branching $ osp(1|2n) \supset sp(2n) \supset u(n)$, we find
explicit infinite-dimensional unitary irreducible lowest weight representations
of sp(2n) and their characters.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 10:59:20 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 13:08:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lievens",
"S.",
""
],
[
"Stoilova",
"N. I.",
""
],
[
"Van der Jeugt",
"J.",
""
]
] |
0706.4197 | Badri Dvalishvili | B. P. Dvalishvili | On the Theory of Relative Bitopological and Topological Properties | 133 pages | null | null | null | math.GN | null | In the first part of the work (Sections 2-6) a special attention is given to
relative separation axioms and relative connectedness, in particular, many
relative versions of p-T_0, p-T_1, p-T_2, (i,j)- and p-regularities, (i,j)- and
p-complete regularities, p-real normality and p-normality are discussed.
Moreover, relative properties of (i,j)- and p-compactness types, including
relative versions of (i,j)- and p-paracompactness, (i,j)- and p-Lindeofness,
(i,j)- and p-pseudocompactness are also introduced and investigated. The second
part (Sections 7-12) is devoted, on the one hand, to relative bitopological
inductive and covering dimension functions and, on the other hand, to relative
versions of Baire spaces for both the topological and the bitopological case.
At the end, note that relative (bi)topological properties play a special role
not only in the development of respective theories, but also in the
strengthening of the previously known results.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:01:04 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Dvalishvili",
"B. P.",
""
]
] |
0706.4198 | Yvonne Wong | Steen Hannestad, Alessandro Mirizzi, Georg G. Raffelt, Yvonne Y. Y.
Wong | Cosmological constraints on neutrino plus axion hot dark matter | 13 pages, 2 figures, uses iopart.cls | JCAP 0708:015,2007 | 10.1088/1475-7516/2007/08/015 | MPP-2007-81 | astro-ph hep-ph | null | We use observations of the cosmological large-scale structure to derive
limits on two-component hot dark matter consisting of mass-degenerate neutrinos
and hadronic axions, both components having velocity dispersions corresponding
to their respective decoupling temperatures. We restrict the data samples to
the safely linear regime, in particular excluding the Lyman-alpha forest. Using
standard Bayesian inference techniques we derive credible regions in the
two-parameter space of m_a and sum(m_nu). Marginalising over sum(m_nu) provides
m_a < 1.2 eV (95% C.L.). In the absence of axions the same data and methods
give sum(m_nu) < 0.65 eV (95% C.L.). We also derive limits on m_a for a range
of axion-pion couplings up to one order of magnitude larger or smaller than the
hadronic value.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:04:31 GMT"
}
] | 2009-06-12T00:00:00 | [
[
"Hannestad",
"Steen",
""
],
[
"Mirizzi",
"Alessandro",
""
],
[
"Raffelt",
"Georg G.",
""
],
[
"Wong",
"Yvonne Y. Y.",
""
]
] |
0706.4199 | Raquel Salmeron | Raquel Salmeron (The Australian National University), Arieh K\"onigl
(The University of Chicago) and Mark Wardle (Macquarie University) | Radial and vertical angular momentum transport in protostellar discs | 5 pages, 2 figures, 1 table, aastex.cls. Accepted for publication in
Astrophysics & Space Science | null | 10.1007/s10509-007-9563-z | null | astro-ph | null | Angular momentum in protostellar discs can be transported either radially,
through turbulence induced by the magnetorotational instability (MRI), or
vertically, through the torque exerted by a large-scale magnetic field. We
present a model of steady-state discs where these two mechanisms operate at the
same radius and derive approximate criteria for their occurrence in an
ambipolar diffusion dominated disc. We obtain "weak field'' solutions - which
we associate with the MRI channel modes in a stratified disc - and transform
them into accretion solutions with predominantly radial angular-momentum
transport by implementing a turbulent-stress prescription based on published
results of numerical simulations. We also analyze "intermediate field
strength'' solutions in which both radial and vertical transport operate at the
same radial location. Our results suggest, however, that this overlap is
unlikely to occur in real discs.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:07:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Salmeron",
"Raquel",
"",
"The Australian National University"
],
[
"Königl",
"Arieh",
"",
"The University of Chicago"
],
[
"Wardle",
"Mark",
"",
"Macquarie University"
]
] |
0706.4200 | Doron Gazit | Doron Gazit and Nir Barnea | Few body Calculation of Neutrino Neutral Inelastic scattering on 4He | 4 pages; talk at 18th International Conference on Few-Body Problems
in Physics (FB18), Santos, SP, Brazil, August 2006 | Nucl.Phys.A790:356-359,2007 | 10.1016/j.nuclphysa.2007.03.064 | null | nucl-th | null | The inelastic neutral reaction of neutrino on 4He is calculated using two
modern nucleon--nucleon potentials. Full final state interaction among the four
nucleons is considered, via the Lorentz integral transform (LIT) method. The
effective interaction hyperspherical-harmonic (EIHH) approach is used to solve
the resulting Schrodinger like equations. A detailed energy dependent
calculation is given in the impulse approximation.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:13:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gazit",
"Doron",
""
],
[
"Barnea",
"Nir",
""
]
] |
0706.4201 | Xiaoping Xu | Xiaoping Xu | Tree Diagram Lie Algebras of Differential Operators and Evolution
Partial Differential Equations | 31pages | Journal of Lie Theory, Vol 16 (2006), 691-718 | null | null | math.RT math-ph math.AP math.MP nlin.SI | null | A tree diagram is a tree with positive integral weight on each edge, which is
a notion generalized from the Dynkin diagrams of finite-dimensional simple Lie
algebras. We introduce two nilpotent Lie algebras and their extended solvable
Lie algebras associated with each tree diagram. The solvable tree diagram Lie
algebras turn out to be complete Lie algebras of maximal rank analogous to the
Borel subalgebras of finite-dimensional simple Lie algebras. Their abelian
ideals are completely determined. Using a high-order Campbell-Hausdorff formula
and certain abelian ideals of the tree diagram Lie algebras, we solve the
initial value problem of first-order evolution partial differential equations
associated with nilpotent tree diagram Lie algebras and high-order evolution
partial differential equations, including heat conduction type equations
related to generalized Tricomi operators associated with trees.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:13:42 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Xu",
"Xiaoping",
""
]
] |
0706.4202 | Andreas Wacker | Andreas Wacker | Coherence and Spatial Resolution of Transport in Quantum Cascade Lasers | 6 pages, figures included, submitted to Proceedings of HCIS-15,
physica status solidi (c) | physica status solidi c 5, 215 (2008) | 10.1002/pssc.200776508 | null | cond-mat.mes-hall | null | The method of nonequilibrium Greens functions allows for a spatial and
energetical resolution of the electron current in Quantum Cascade Lasers. While
scattering does not change the spatial position of carriers, the entire spatial
evolution of charge can be attributed to coherent transport by complex wave
functions. We discuss the hierarchy of transport models and derive the density
matrix equations as well as the hopping model starting from the nonequilibrium
Greens functions approach.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:40:41 GMT"
}
] | 2008-01-02T00:00:00 | [
[
"Wacker",
"Andreas",
""
]
] |
0706.4203 | Alexey Zaytsev Ivanovich | Alexey Zaytsev | Optimal curves of low genus over finite fields | a proof of the theorem 5.6 was corrected | null | null | null | math.AG math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hasse-Weil-Serre bound is improved for curves of low genera over finite
fields with discriminant in {-3,-4,-7,-8,-11,-19} by studying optimal curves.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:26:36 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Jun 2011 21:50:51 GMT"
},
{
"version": "v3",
"created": "Wed, 31 Aug 2011 05:08:32 GMT"
}
] | 2011-09-01T00:00:00 | [
[
"Zaytsev",
"Alexey",
""
]
] |
0706.4204 | Nadezhda Tsoneva Larionova | N. Tsoneva, H. Lenske | Investigation of Pygmy Dipole Resonances in the Tin Region | 41 pages, 10 figures, PRC | Phys.Rev.C77:024321,2008 | 10.1103/PhysRevC.77.024321 | null | nucl-th | null | The evolution of the low-energy electromagnetic dipole response with the
neutron excess is investigated along the Sn isotopic chain within an approach
incorporating Hartree-Fock-Bogoljubov (HFB) and multi-phonon
Quasiparticle-Phonon-Model (QPM) theory. General aspects of the relationship of
nuclear skins and dipole sum rules are discussed. Neutron and proton transition
densities serve to identify the Pygmy Dipole Resonance (PDR) as a generic mode
of excitation. The PDR is distinct from the GDR by its own characteristic
pattern given by a mixture of isoscalar and isovector components. Results for
the $^{100}$Sn-$^{132}$Sn isotopes and the several N=82 isotones are presented.
In the heavy Sn-isotopes the PDR excitations are closely related to the
thickness of the neutron skin. Approaching $^{100}$Sn a gradual change from a
neutron to a proton skin is found and the character of the PDR is changed
correspondingly. A delicate balance between Coulomb and strong interaction
effects is found. The fragmentation of the PDR strength in $^{124}$Sn is
investigated by multi-phonon calculations. Recent measurements of the dipole
response in $^{130,132}$Sn are well reproduced.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:34:13 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 13:52:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tsoneva",
"N.",
""
],
[
"Lenske",
"H.",
""
]
] |
0706.4205 | Andrew Rose | Andrew Rose | The extended Burnside ring and module categories | This paper has been superceded by 1110.4722 | null | null | null | math.RT | null | In this note an `extended Burnside ring' is defined, generated by classes of
semisimple module categories over Rep(G) with quasifibre functors. Here G is a
finite group and representations are taken over an algebraically closed field
of characteristic 0. It is shown that this is equivalent to a ring generated by
centrally extended G-sets and hence the name. Ring homomorphisms into the
multiplicative group of the field are computed with an explicit formula and
tables of these homomorphisms are given for the groups S_4 and S_5 which are of
particular interest in the context of reductive algebraic groups.
-----
L'anneau de Burnside \'etendu et cat\'egories de modules. Dans cette note un
`Anneau de Burnside \'etendu' est d\'efini, gener\'e par des classes de
cat\'egories de modules semisimples sur Rep(G) avec des foncteurs quasifibres.
Ici G est un groupe fini, et des repr\'esentations sont prises sur un corps
alg\'ebriquement clos de caract\'eristique nulle. Il est demontr\'e que ceci
\'equivaut \`a un anneau gener\'e par des G-ensembles centralement \'etendus,
d'o\`u le nom. Des homomorphismes d'anneau dans le groupe multiplicatif du
corps sont comput\'ees avec une formule explicite et des tableaux de ces
homomorphismes sont fournis pour les groupes S_4 et S_5 qui sont d'un
int\'er\^et particulier dans le contexte de groupes alg\'ebriques r\'eductifs.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:36:31 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Oct 2011 15:57:03 GMT"
}
] | 2011-10-28T00:00:00 | [
[
"Rose",
"Andrew",
""
]
] |
0706.4206 | E. -Michael Ilgenfritz | V. G. Bornyakov, E.-M. Ilgenfritz, B. V. Martemyanov, S. M. Morozov,
M. M\"uller-Preussker, A. I. Veselov | Calorons and dyons at the thermal phase transition analyzed by overlap
fermions | 17 pages, 8 figures, minor changes (typos, grants, ..) | Phys.Rev.D76:054505,2007 | 10.1103/PhysRevD.76.054505 | HU-EP-07/10, ITEP-LAT/2007-23 | hep-lat hep-ph | null | In a pilot study, we use the topological charge density defined by the
eigenmodes of the overlap Dirac operator (with ultraviolet filtering by
mode-truncation) to search for lumps of topological charge in SU(2) pure gauge
theory. Augmenting this search with periodic and antiperiodic temporal boundary
conditions for the overlap fermions, we demonstrate that the lumps can be
classified either as calorons or as separate caloron constituents (dyons).
Inside the topological charge clusters the (smeared) Polyakov loop is found to
show the typical profile characteristic for calorons and dyons. This
investigation, motivated by recent caloron/dyon model studies, is performed at
the deconfinement phase transition for SU(2) gluodynamics on 20^3 x 6 lattices
described by the tadpole improved L\"uscher-Weisz action. The transition point
has been carefully located. As a necessary condition for the caloron/dyon
detection capability, we check that the LW action, in contrast to the Wilson
action, generates lattice ensembles, for which the overlap Dirac eigenvalue
spectrum smoothly behaves under smearing and under the change of the boundary
conditions.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:38:10 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 07:50:00 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Jul 2007 14:43:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bornyakov",
"V. G.",
""
],
[
"Ilgenfritz",
"E. -M.",
""
],
[
"Martemyanov",
"B. V.",
""
],
[
"Morozov",
"S. M.",
""
],
[
"Müller-Preussker",
"M.",
""
],
[
"Veselov",
"A. I.",
""
]
] |
0706.4207 | Richard Jozsa | Richard Jozsa | Complex weak values in quantum measurement | 5 pages | null | 10.1103/PhysRevA.76.044103 | null | quant-ph | null | In the weak measurement formalism of Y. Aharonov et al. the so-called weak
value A_w of any observable A is generally a complex number. We derive a
physical interpretation of its value in terms of the shift in the measurement
pointer's mean position and mean momentum. In particular we show that the mean
position shift contains a term jointly proportional to the imaginary part of
the weak value and the rate at which the pointer is spreading in space as it
enters the measurement interaction.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:40:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jozsa",
"Richard",
""
]
] |
0706.4208 | Itay Asulin | Itay Asulin, Ofer Yuli, Israel Felner, Gad Koren, and Oded Millo | Penetration of Andreev bound states into the ferromagnet in a
SrRuO$_{3}$/(110)YBa$_2$Cu$_3$O$_{7-\delta}$ bilayer: a scanning tunneling
spectroscopy study | 4 figures | null | 10.1103/PhysRevB.76.064507 | null | cond-mat.supr-con | null | Scanning tunneling spectroscopy of thin epitaxial
$SrRuO_{3}/(110)YBa_2Cu_3O_{7-\delta}$ ferromagnet/superconductor bilayers,
reveal a clear penetration of the Andreev bound states into the ferromagnetic
layer. The penetration is manifested in the density of states of the
ferromagnet as a split zero bias conductance peak with an imbalance between
peak heights. Our data indicate that the splitting occurs at the superconductor
side as a consequence of induced magnetization, confirming recent theoretical
predictions. The imbalance is attributed to the spin polarization in the
ferromagnet.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 11:52:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Asulin",
"Itay",
""
],
[
"Yuli",
"Ofer",
""
],
[
"Felner",
"Israel",
""
],
[
"Koren",
"Gad",
""
],
[
"Millo",
"Oded",
""
]
] |
0706.4209 | Pierre Muller | P.Muller, P.turban, L.Lapena, S.Andrieu | Elastic relaxation during 2D epitaxial growth: a study of in-plane
lattice spacing oscillations | 39 pages, 10 figures | Surface Science 488 (2001) 52 | 10.1016/S0039-6028(01)01081-0 | null | cond-mat.mtrl-sci | null | The purpose of this paper is to report some new experimental and theoretical
results about the analysis of in-plane lattice spacing oscillations during
two-dimensional (2D) homo and hetero epitaxial growth. The physical origin of
these oscillations comes from the finite size of the strained islands. The 2D
islands may thus relax by their edges, leading to in-plane lattice spacing
oscillations during the birth and spread of these islands. On the one hand, we
formulate the problem of elastic relaxation of a coherent 2D epitaxial deposits
by using the concept of point forces and demonstrate that the mean deformation
in the islands exhibits an oscillatory behaviour. On the other hand, we
calculate the intensity diffracted by such coherently deposited 2D islands by
using a mean model of a pile-up of weakly deformed layers. The amplitude of
in-plane lattice spacing oscillations is found to depend linearly on the misfit
and roughly linearly on the nucleation density. We show that the nucleation
density may be approximated from the full-width at half maximum of the
diffracted rods at half coverages. The predicted dependence of the in-plane
lattice spacing oscillations amplitude with the nucleation density is thus
experimentally verified on V/Fe(001), Mn/Fe(001), Ni/Fe(001), Co/Cu(001) and
V/V(001).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:00:23 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Muller",
"P.",
""
],
[
"turban",
"P.",
""
],
[
"Lapena",
"L.",
""
],
[
"Andrieu",
"S.",
""
]
] |
0706.4210 | Yi Song | Yi Song, Xu Xu and Stephen P. Banks (ACSE, University of Sheffield) | Automorphic Forms and Reeb-Like Foliations on Three-Manifolds | 22 pages with 22 figures, submitted to J. of Mathmatical analysis and
applications | null | null | null | math.DS | null | In this paper, we consider different ways of generating dynamical systems on
3-manifolds. We first derive explicit differential equations for dynamical
systems defined on generic hyperbolic 3-manifolds by using automorphic function
theory to uniformize the upper half-space model. It is achieved via the
modification of the standard Poincare theta series to generate systems
invariant within each individual fundamental region such that the solution
trajectories match up on the appropriate sides after the identifications which
generate a hyperbolic 3-manifold. Then we consider the gluing pattern in the
conformal ball model. At the end we shall study the construction of dynamical
systems by using the Reeb foliation.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:07:53 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Song",
"Yi",
"",
"ACSE, University of Sheffield"
],
[
"Xu",
"Xu",
"",
"ACSE, University of Sheffield"
],
[
"Banks",
"Stephen P.",
"",
"ACSE, University of Sheffield"
]
] |
0706.4211 | Thibaut Le Bertre | Y. Libert, E. Gerard and T. Le Bertre | The formation of a detached shell around the carbon star Y CVn | Accepted for publication in Monthly Notices of the Royal Astronomical
Society | null | 10.1111/j.1365-2966.2007.12154.x | null | astro-ph | null | Y CVn is a carbon star surrounded by a detached dust shell that has been
imaged by the Infrared Space Observatory at 90 microns. With the Nancay Radio
Telescope we have studied the gaseous counterpart in the 21-cm HI emission
line. New data have been acquired and allow to improve the signal to noise
ratio on this line. The high spectral resolution line profiles obtained at the
position of the star and at several offset positions set strong constraints on
the gas temperature and kinematics within the detached shell; the bulk of the
material should be at ~ 100-200 K and in expansion at ~ 1-2 km/s. In addition,
the line profile at the central position shows a quasi-rectangular pedestal
that traces an 8 km/s outflow of ~ 1.0 10^-7 Msol/yr, stable for about 2 10^4
years, which corresponds to the central outflow already studied with CO
rotational lines. We present a model in which the detached shell results from
the slowing-down of the stellar wind by surrounding matter. The inner radius
corresponds to the location where the stellar outflow is abruptly slowed down
from ~ 8 km/s to 2 km/s (termination shock). The outer radius corresponds to
the location where external matter is compressed by the expanding shell (bow
shock). In this model the mass loss rate of Y CVn has been set constant, at the
same level of 1.0 10^-7 Msol/yr, for ~ 4.5 10^5 years. The gas temperature
varies from ~ 1800 K at the inner limit to 165 K at the interface between
circumstellar matter and external matter. Our modelling shows that the presence
of a detached shell around an AGB star may not mean that a drastic reduction of
the mass loss rate has occurred in the past. The inner radius of such a shell
might only be the effect of a termination shock rather than of an interruption
of the mass loss process.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:10:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Libert",
"Y.",
""
],
[
"Gerard",
"E.",
""
],
[
"Bertre",
"T. Le",
""
]
] |
0706.4212 | Andrej El | A. El, C. Greiner, Z. Xu | Shear Viscosity to Entropy within a Parton Cascade | 2 pages, 4 Figures. Contributed by C.Greiner by Workshop on Heavy Ion
Collisions at the LHC: Last Call for Predictions, Geneva, Switzerland, 14
May-8 Jun 2007 | null | null | null | hep-ph | null | The shear viscosity is calculated by means of the perturbative kinetic
partonic cascade BAMPS with CGC initial conditons for various saturation
momentum scale Q_s. eta/s ~ 0.15 stays approximately constant when going from
RHIC to LHC.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:30:50 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"El",
"A.",
""
],
[
"Greiner",
"C.",
""
],
[
"Xu",
"Z.",
""
]
] |
0706.4213 | Dan H\"uvonen | D. H\"uvonen, U. Nagel, T. R\~o\~om, P. Haas, M. Dressel, Y.-J. Wang,
J. Akimitsu | Magneto-optic far-infrared study of Sr$_{14}$Cu$_{24}$O$_{41}$: triplet
excitations in chains | null | null | 10.1103/PhysRevB.76.134418 | null | cond-mat.other | null | Using far-infrared spectroscopy we have studied the magnetic field and
temperature dependence of the spin gap modes in the chains of
Sr$_{14}$Cu$_{24}$O$_{41}$. Two triplet modes T$_1$ and T$_2$ were found in the
center of the Brillouin zone at $\Delta_1=9.65$ meV and $\Delta_2=10.86$ meV in
zero magnetic field. The T$_1$ mode was excited when the electric field vector
${\bf E}$ of the light was polarized along the b axis (perpendicular to the
planes of chains and ladders) and T$_2$ was excited for ${\bf E}\parallel {\bf
a}$ (perpendicular to the chains and along the rungs). Up to the maximum
magnetic field of 18 T, applied along the chains, the electron $g$ factors of
these two modes were similar, $g_{1c}=2.049$ and $g_{2c}=2.044$. Full linewidth
at half maximum for both modes was 1 cm$^{-1}$ (0.12 meV) at 4K and increased
with $T$. The temperature dependence of mode energies and line intensities was
in agreement with the inelastic neutron scattering results from two groups
[Matsuda {\it et al.}, Phys. Rev. B {\bf 59}, 1060 (1999) and Regnault {\it et
al.}, Phys. Rev. B {\bf 59}, 1055 (1999)]. The T$_1$ mode has not been observed
by inelastic neutron scattering in the points of the $k$-space equivalent to
the center of the Brillouin zone. Our study indicates that the zone structure
model of magnetic excitations of Sr$_{14}$Cu$_{24}$O$_{41}$ must be modified to
include a triplet mode at 9.65 meV in the center of the magnetic Brillouin
zone.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:32:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hüvonen",
"D.",
""
],
[
"Nagel",
"U.",
""
],
[
"Rõõm",
"T.",
""
],
[
"Haas",
"P.",
""
],
[
"Dressel",
"M.",
""
],
[
"Wang",
"Y. -J.",
""
],
[
"Akimitsu",
"J.",
""
]
] |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.