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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.0598 | Jun Zhang Dr. | Jun Zhang, Guiping Zhou, Jingxiu Wang and Haimin Wang | Magnetic Evolution and Temperature Variation in a Coronal Hole | null | Astrophys.J.655:L113-L116,2007 | 10.1086/511974 | null | astro-ph | null | We have explored the magnetic flux evolution and temperature variation in a
coronal-hole region, using Big Bear Solar Observatory (BBSO) deep magnetograms
and {\it SOHO}/EIT images observed from 2005 October 10 to 14. For comparison,
we also investigated a neighboring quiet region of the Sun. The coronal hole
evolved from its mature stage to its disappearance during the observing period.
We have obtained the following results: (1) When the coronal hole was well
developed on October 10, about 60 % of the magnetic flux was positive. The EUV
brightness was 420 counts pixel$^{-1}$, and the coronal temperature, estimated
from the line ratio of the EIT 195 {\AA} and 171 {\AA} images, was 1.07 MK. (2)
On October 14, when the coronal hole had almost disappeared, 51 % of the
magnetic flux was positive, the EUV radiance was 530 counts pixel$^{-1}$, and
the temperature was 1.10 MK. (3) In the neighboring quiet region, the fraction
of positive flux varied between 0.49 and 0.47. The EUV brightness displayed an
irregular variation, with a mean value of 870 counts pixel$^{-1}$. The
temperature was almost constant at 1.11 MK during the five-day observation. Our
results demonstrate that in a coronal hole less imbalance of the magnetic flux
in opposite polarities leads to stronger EUV brightness and higher coronal
temperatures.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 11:48:40 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Zhang",
"Jun",
""
],
[
"Zhou",
"Guiping",
""
],
[
"Wang",
"Jingxiu",
""
],
[
"Wang",
"Haimin",
""
]
] |
0705.0599 | Nathalie Henry | Nathalie Henry, Jean-Daniel Fekete, Michael Mcguffin | NodeTrix: Hybrid Representation for Analyzing Social Networks | null | null | 10.1109/TVCG.2007.70582 | null | cs.HC | null | The need to visualize large social networks is growing as hardware
capabilities make analyzing large networks feasible and many new data sets
become available. Unfortunately, the visualizations in existing systems do not
satisfactorily answer the basic dilemma of being readable both for the global
structure of the network and also for detailed analysis of local communities.
To address this problem, we present NodeTrix, a hybrid representation for
networks that combines the advantages of two traditional representations:
node-link diagrams are used to show the global structure of a network, while
arbitrary portions of the network can be shown as adjacency matrices to better
support the analysis of communities. A key contribution is a set of interaction
techniques. These allow analysts to create a NodeTrix visualization by dragging
selections from either a node-link or a matrix, flexibly manipulate the
NodeTrix representation to explore the dataset, and create meaningful summary
visualizations of their findings. Finally, we present a case study applying
NodeTrix to the analysis of the InfoVis 2004 coauthorship dataset to illustrate
the capabilities of NodeTrix as both an exploration tool and an effective means
of communicating results.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 11:50:07 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 08:53:45 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Jun 2007 13:32:58 GMT"
}
] | 2020-08-04T00:00:00 | [
[
"Henry",
"Nathalie",
""
],
[
"Fekete",
"Jean-Daniel",
""
],
[
"Mcguffin",
"Michael",
""
]
] |
0705.0600 | Schehr Gregory | H. J. Hilhorst, G. Schehr | A note on q-Gaussians and non-Gaussians in statistical mechanics | 17 pages including 3 figures. Introduction and references expanded | J. Stat. Mech. (2007) P06003 | 10.1088/1742-5468/2007/06/P06003 | null | cond-mat.stat-mech | null | The sum of $N$ sufficiently strongly correlated random variables will not in
general be Gaussian distributed in the limit N\to\infty. We revisit examples of
sums x that have recently been put forward as instances of variables obeying a
q-Gaussian law, that is, one of type (cst)\times[1-(1-q)x^2]^{1/(1-q)}. We show
by explicit calculation that the probability distributions in the examples are
actually analytically different from q-Gaussians, in spite of numerically
resembling them very closely. Although q-Gaussians exhibit many interesting
properties, the examples investigated do not support the idea that they play a
special role as limit distributions of correlated sums.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 11:52:04 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 13:46:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hilhorst",
"H. J.",
""
],
[
"Schehr",
"G.",
""
]
] |
0705.0601 | Anjan Kumar Chandra | Anjan Kumar Chandra, Subinay Dasgupta | Floating Phase in 2D ANNNI Model | 9 pages, 17 figures | J. Phys. A: Math. Theor. 40 (2007) 6251-6265 | 10.1088/1751-8113/40/24/001 | null | cond-mat.stat-mech | null | We investigate whether the floating phase (where the correlation length is
infinite and the spin-spin correlation decays algebraically with distance)
exists in the temperature($T$) - frustration parameter ($\kappa$) phase diagram
of 2D ANNNI model. To identify this phase, we look for the region where (i)
finite size effect is prominent and (ii) some relevant physical quantity
changes somewhat sharply and this change becomes sharper as the system size
increases. For $\kappa < 0.5 $, the low temperature phase is ferromagnetic and
we study energy and magnetization. For $\kappa > 0.5 $, the low temperature
phase is antiphase and we study energy, layer magnetization, length of domain
walls running along the direction of frustration, number of domain-intercepts
that are of length 2 along the direction of frustration, and the number of
domain walls that do not touch the upper and/or lower boundary. In agreement
with some previous studies, our final conclusion is that, the floating phase
exists, if at all, only along a line.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 11:53:15 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Chandra",
"Anjan Kumar",
""
],
[
"Dasgupta",
"Subinay",
""
]
] |
0705.0602 | Alejandro Chinea Manrique De Lara | Alejandro Chinea Manrique De Lara (INRIA Rocquencourt), Michel Parent
(INRIA Rocquencourt) | Risk Assessment Algorithms Based On Recursive Neural Networks | null | Dans International Joint Conference On Neural Networks - IJCNN
2007 (2007) | null | null | cs.NE | null | The assessment of highly-risky situations at road intersections have been
recently revealed as an important research topic within the context of the
automotive industry. In this paper we shall introduce a novel approach to
compute risk functions by using a combination of a highly non-linear processing
model in conjunction with a powerful information encoding procedure.
Specifically, the elements of information either static or dynamic that appear
in a road intersection scene are encoded by using directed positional acyclic
labeled graphs. The risk assessment problem is then reformulated in terms of an
inductive learning task carried out by a recursive neural network. Recursive
neural networks are connectionist models capable of solving supervised and
non-supervised learning problems represented by directed ordered acyclic
graphs. The potential of this novel approach is demonstrated through well
predefined scenarios. The major difference of our approach compared to others
is expressed by the fact of learning the structure of the risk. Furthermore,
the combination of a rich information encoding procedure with a generalized
model of dynamical recurrent networks permit us, as we shall demonstrate, a
sophisticated processing of information that we believe as being a first step
for building future advanced intersection safety systems
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 11:53:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"De Lara",
"Alejandro Chinea Manrique",
"",
"INRIA Rocquencourt"
],
[
"Parent",
"Michel",
"",
"INRIA Rocquencourt"
]
] |
0705.0603 | Pedro Daniel Gonzalez Perez | Pedro Daniel Gonzalez Perez, Fernando Hernando | Quasi Ordinary Singularities, Essential Divisors and Poincare Series | The version corrects some misprints | null | 10.1112/jlms/jdp014 | null | math.AG | null | We define Poincar\'e series associated to a toric or analytically irreducible
quasi-ordinary hypersurface singularity, (S,0), by a finite sequence of
monomial valuations, such that at least one of them is centered at the origin
0. This involves the definition of a multi-graded ring associated to the
analytic algebra of the singularity by the sequence of valuations. We prove
that the Poincar\'e series is a rational function with integer coefficients,
which can be defined also as an integral with respect of the Euler
characteristic, over the projectivization of the analytic algebra of the
singularity, of a function defined by the valuations. In particular, the
Poincar\'e series associated to the set of divisorial valuations associated to
the essential divisors, considered both over the singular locus and over the
point 0, is an analytic invariant of the singularity. In the quasi-ordinary
hypersurface case we prove that this Poincar\'e series determines and it is
determined by the normalized sequence of characteristic monomials. These
monomials in the analytic case define a complete invariant of the embedded
topological type of the hypersurface singularity.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 11:57:24 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 18:35:41 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Jan 2008 18:42:57 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Perez",
"Pedro Daniel Gonzalez",
""
],
[
"Hernando",
"Fernando",
""
]
] |
0705.0604 | Jun Zhang Dr. | Jun Zhang, S. Solanki, and J. Woch | Discovery of inward moving magnetic enhancements in sunspot penumbrae | 4 pages, 4 figures, submitted to ApJ Letters | null | 10.1051/0004-6361:20077829 | null | astro-ph | null | Sunspot penumbrae show a fine structure in continuum intensity that displays
considerable dynamics. The magnetic field, in contrast, although also highly
structured, has appeared to be relatively static. Here we report the discovery
of inward moving magnetic enhancements in the penumbrae of two regular sunspots
based on time series of SOHO/MDI magnetograms. Local enhancements of the LOS
component of the magnetic field in the inner part of the penumbral region move
inward to the umbra-penumbra boundary with a radial speed of about 0.3 km
s$^{-1}$. These local inward-moving enhancements of the LOS component of the
magnetic fields appear to be relatively common. They are associated with dark
structures and tend to display downflows relatively to the penumbral
background. Possible explanations are discussed.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:02:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhang",
"Jun",
""
],
[
"Solanki",
"S.",
""
],
[
"Woch",
"J.",
""
]
] |
0705.0605 | Kirill Sokolovsky | S.V. Antipin, K.V. Sokolovsky, T.I. Ignatieva | TYC 1031 01262 1: The First Known Galactic Eclipsing Binary with a Type
II Cepheid Component | 3 pages, 3 figures, accepted to MNRAS Letters | Mon.Not.Roy.Astron.Soc.379:L60-L62,2007 | 10.1111/j.1745-3933.2007.00335.x | null | astro-ph | null | We present the discovery and CCD observations of the first eclipsing binary
with a Type II Cepheid component in our Galaxy. The pulsation and orbital
periods are found to be 4.1523 and 51.38 days, respectively, i.e. this variable
is a system with the shortest orbital period among known Cepheid binaries.
Pulsations dominate the brightness variations. The eclipses are assumed to be
partial. The EB-subtype eclipsing light curve permits to believe that the
binary's components are non-spherical.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:26:07 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 10:32:16 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Antipin",
"S. V.",
""
],
[
"Sokolovsky",
"K. V.",
""
],
[
"Ignatieva",
"T. I.",
""
]
] |
0705.0606 | Konrad Swanepoel | Konrad J Swanepoel | A new proof of Vazsonyi's conjecture | 4 pages | Journal of Combinatorial Theory, Ser. A 115 (2008) 888-892. | 10.1016/j.jcta.2007.08.006 | null | math.CO math.MG | null | We present a self-contained proof that the number of diameter pairs among n
points in Euclidean 3-space is at most 2n-2. The proof avoids the ball
polytopes used in the original proofs by Grunbaum, Heppes and Straszewicz. As a
corollary we obtain that any three-dimensional diameter graph can be embedded
in the projective plane.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:18:43 GMT"
}
] | 2008-05-13T00:00:00 | [
[
"Swanepoel",
"Konrad J",
""
]
] |
0705.0607 | Jun Zhang Dr. | Jun Zhang, Leping Li, and Qiao Song | Interaction between a fast rotating sunspot and ephemeral regions as the
origin of the major solar event on 2006 December 13 | 4 pages, 6 figures, ApJ Letters inpress | null | 10.1086/519280 | null | astro-ph | null | The major solar event on 2006 December 13 is characterized by the
approximately simultaneous occurrence of a heap of hot ejecta, a great
two-ribbon flare and an extended Earth-directed coronal mass ejection. We
examine the magnetic field and sunspot evolution in active region NOAA AR
10930, the source region of the event, while it transited the solar disk centre
from Dec. 10 to Dec. 13. We find that the obvious changes in the active region
associated with the event are the development of magnetic shear, the appearance
of ephemeral regions and fast rotation of a smaller sunspot. Around the area of
the magnetic neutral line of the active region, interaction between the fast
rotating sunspot and the ephemeral regions triggers continual brightening and
finally the major flare. It is indicative that only after the sunspot rotates
up to 200$^{\circ}$ does the major event take place. The sunspot rotates at
least 240$^{\circ}$ about its centre, the largest sunspot rotation angle which
has been reported.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:56:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhang",
"Jun",
""
],
[
"Li",
"Leping",
""
],
[
"Song",
"Qiao",
""
]
] |
0705.0608 | Laurette S. Tuckerman | Piotr Boronski and Laurette S. Tuckerman | Poloidal-toroidal decomposition in a finite cylinder. I. Influence
matrices for the magnetohydrodynamic equations | null | Journal of Computational Physics 227, 1523-1543 (2007) | 10.1016/j.jcp.2007.08.023 | null | math.NA physics.comp-ph | null | The Navier-Stokes equations and magnetohydrodynamics equations are written in
terms of poloidal and toroidal potentials in a finite cylinder. This
formulation insures that the velocity and magnetic fields are divergence-free
by construction, but leads to systems of partial differential equations of
higher order, whose boundary conditions are coupled. The influence matrix
technique is used to transform these systems into decoupled parabolic and
elliptic problems. The magnetic field in the induction equation is matched to
that in an exterior vacuum by means of the Dirichlet-to-Neumann mapping, thus
eliminating the need to discretize the exterior. The influence matrix is scaled
in order to attain an acceptable condition number.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:22:29 GMT"
}
] | 2007-11-22T00:00:00 | [
[
"Boronski",
"Piotr",
""
],
[
"Tuckerman",
"Laurette S.",
""
]
] |
0705.0609 | Hasan Karabulut | Hasan Karabulut | The physical meaning of Lagrange multipliers | 15 pages(12 pts) with no figures | European Journal of Physics, 27, 709-718 (2006) | 10.1088/0143-0807/27/4/003 | null | physics.ed-ph physics.gen-ph | null | A rule to assign a physical meaning to Lagrange multipliers is discussed.
Examples from mechanics, statistical mechanics and quantum mechanics are given.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:22:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Karabulut",
"Hasan",
""
]
] |
0705.0610 | Aleksandr Smorodin Vyacheslavovich | Yu.Z. Kovdrya, V.A. Nikolaenko, and A.V. Smorodin | Influence of substrate charge on electron transport in narrow conducting
channel | 6 pages, 3 figures | null | 10.1088/0953-8984/20/03/035221 | null | cond-mat.str-el cond-mat.other | null | The electron transport in inhomogeneous quasi-one-dimensional conducting
channels on the liquid helium surface are studied in the temperature range
0.6-1.5 K. Inhomogeneities are created by charging the substrate on which the
conducting channels are formed. It has been established that the electron
conductivity practically does not depend on temperature at some substrate
charge. The results obtained are explained by localization of carriers and
creation of electron polarons.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:24:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kovdrya",
"Yu. Z.",
""
],
[
"Nikolaenko",
"V. A.",
""
],
[
"Smorodin",
"A. V.",
""
]
] |
0705.0611 | Paul de Jong | Paul de Jong | Challenges for early discovery in ATLAS and CMS | 6 pages, 17 figures | null | null | NIKHEF-2007-011 | hep-ex | null | The challenges for a discovery of new physics with 1 fb^-1 of LHC data for
ATLAS and CMS are discussed. Four specific examples are chosen: a deviation of
QCD jet distributions at high E_T, high-mass dilepton pairs, Higgs search in
the WW decay channel, and low mass supersymmetry.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:28:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"de Jong",
"Paul",
""
]
] |
0705.0612 | Katrin Borcea-Pfitzmann | Katrin Borcea-Pfitzmann, Anne-Katrin Stange | Privacy - an Issue for eLearning? A Trend Analysis Reflecting the
Attitude of European eLearning Users | null | null | null | TUD-FI07-01 | cs.CY | null | Availing services provided via the Internet became a widely accepted means in
organising one's life. Beside others, eLearning goes with this trend as well.
But, while employing Internet service makes life more convenient, at the same
time, it raises risks with respect to the protection of the users' privacy.
This paper analyses the attitudes of eLearning users towards their privacy by,
initially, pointing out terminology and legal issues connected with privacy.
Further, the concept and implementation as well as a result analysis of a
conducted study is presented, which explores the problem area from different
perspectives. The paper will show that eLearning users indeed care for the
protection of their personal information when using eLearning services.
However, their attitudes and behaviour slightly differ. In conclusion, we
provide first approaches of assisting possibilities for users how to resolve
the difference of requirements and their actual activities with respect to
privacy protection.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:30:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Borcea-Pfitzmann",
"Katrin",
""
],
[
"Stange",
"Anne-Katrin",
""
]
] |
0705.0613 | Rachel Martins | Rachel A.D. Martins | Finite temperature corrections and embedded strings in noncommutative
geometry and the standard model with neutrino mixing | 42 pages | J.Math.Phys.48:083509,2007 | 10.1063/1.2771551 | null | hep-th | null | The recent extension of the standard model to include massive neutrinos in
the framework of noncommutative geometry and the spectral action principle
involves new scalar fields and their interactions with the usual complex scalar
doublet. After ensuring that they bring no unphysical consequences, we address
the question of how these fields affect the physics predicted in Weinberg-Salam
theory, particularly in the context of the Electroweak phase transition.
Applying the Dolan-Jackiw procedure, we calculate the finite temperature
corrections, and find that the phase transition is first order. The new scalar
interactions significantly improve the stability of the Electroweak Z string,
through the ``bag'' phenomenon described by Watkins and Vachaspati. (Recently
cosmic strings have climbed back into interest due to new evidence). Sourced by
static embedded strings, an internal space analogy of Cartan's torsion is
drawn, and a possible Higgs-force-like `gravitational' effect of this
non-propagating torsion on the fermion masses is described. We also check that
the field generating the Majorana mass for the $\nu_R$ is non-zero in the
physical vacuum.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:34:56 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Aug 2007 17:00:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Martins",
"Rachel A. D.",
""
]
] |
0705.0614 | Yuri Sachkov | Yu. L. Sachkov | Maxwell strata in Euler's elastic problem | 101 page, 54 figures | null | null | null | math.OC | null | The classical Euler's problem on stationary configurations of elastic rod
with fixed endpoints and tangents at the endpoints is considered as a
left-invariant optimal control problem on the group of motions of a
two-dimensional plane $\E(2)$.
The attainable set is described, existence and boundedness of optimal
controls are proved. Extremals are parametrized by Jacobi's elliptic functions
of natural coordinates induced by the flow of the mathematical pendulum on
fibers of the cotangent bundle of $\E(2)$.
The group of discrete symmetries of Euler's problem generated by reflections
in the phase space of the pendulum is studied. The corresponding Maxwell points
are completely described via the study of fixed points of this group. As a
consequence, an upper bound on cut points in Euler's problem is obtained.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 23:25:56 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sachkov",
"Yu. L.",
""
]
] |
0705.0615 | Markus Kuster | R. Battesti (1), B. Beltran (2), H. Davoudiasl (3), M. Kuster (4), P.
Pugnat (5), R. Rabadan (6), A. Ringwald (7), N. Spooner (8), K. Zioutas (9),
((1) Laboratoire National des Champs Magn\'etiques Puls\'es, (2) Queen's
University, (3) University of Wisconsin, (4) TU Darmstadt, (5) CERN, (6)
Institute for Advanced Study, (7) DESY, (8) University of Sheffield, (9)
University of Patras) | Axion Searches in the Past, at Present, and in the Near Future | 38 pages, 26 figures and images, to appear in the Lecture Notes in
Physics volume on Axions (Springer Verlag) | Lect.Notes Phys.741:199-237,2008 | 10.1007/978-3-540-73518-2_10 | null | hep-ex astro-ph | null | Theoretical axion models state that axions are very weakly interacting
particles. In order to experimentally detect them, the use of colorful and
inspired techniques becomes mandatory. There is a wide variety of experimental
approaches that were developed during the last 30 years, most of them make use
of the Primakoff effect, by which axions convert into photons in the presence
of an electromagnetic field. We review the experimental techniques used to
search for axions and will give an outlook on experiments planned for the near
future.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:41:47 GMT"
}
] | 2011-04-11T00:00:00 | [
[
"Battesti",
"R.",
""
],
[
"Beltran",
"B.",
""
],
[
"Davoudiasl",
"H.",
""
],
[
"Kuster",
"M.",
""
],
[
"Pugnat",
"P.",
""
],
[
"Rabadan",
"R.",
""
],
[
"Ringwald",
"A.",
""
],
[
"Spooner",
"N.",
""
],
[
"Zioutas",
"K.",
""
]
] |
0705.0616 | Naceur-Eddine Khelifa | N.-E. Kh\'elifa (LNE- Inm), P. Pinot (LNE- Inm) | Monitoring Air Moisture with Laser Absorption Spectroscopy | 4 | actes du congr\`es (18/06/2007) 4 | null | AXZE SE 61229 | physics.ins-det | null | Determination of air density and the quantitative estimates of water vapour
adsorbed or desorbed by the surface of mass standard, remain the principals
sources of uncertainties when weighing mass standard made from stainless steel
or super alloy. The classical method, for air density determination, use the so
called CIPM-1981/91 formula and the measured air parameters. An other approach
is based only on the results of comparisons, realized successively in air and
in vacuum, between special artefacts. The distribution and the state of water
molecules inside the chamber of mass comparator influence the results of
weighing. Also, the instruments used for air moisture measurement are either,
not very sensitive (capacitive hygrometer) or disturbing for environment
(dew-point hygrometer). To control that, a proposal method is given and
observations of water vapour behaviour inside the enclosure for different
conditions are reported. Keywords. mass metrology, air density, water vapour
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:48:38 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Khélifa",
"N. -E.",
"",
"LNE- Inm"
],
[
"Pinot",
"P.",
"",
"LNE- Inm"
]
] |
0705.0617 | Shailesh Chandrasekharan | Shailesh Chandrasekharan and Abhijit C. Mehta (Duke University) | Effects of the anomaly on the two-flavor QCD chiral phase transition | 4 pages, 5 figures | Phys.Rev.Lett.99:142004,2007 | 10.1103/PhysRevLett.99.142004 | null | hep-lat hep-ph hep-th | null | We use strongly coupled lattice QED with two flavors of massless staggered
fermions to model the physics of pions in two-flavor massless QCD. Our model
has the right chiral symmetries and can be studied efficiently with cluster
algorithms. In particular we can tune the strength of the QCD anomaly and thus
study its effects on the chiral phase transition. Our study confirms the widely
accepted view point that the chiral phase transition is first order in the
absence of the anomaly. Turning on the anomaly weakens the transition and turns
it second order at a critical anomaly strength. The anomaly strength at the
tricritical point is characterized using $r = (M_{\eta'}-M_{\pi})/\rho_{\eta'}$
where $M_{\eta'}, M_{\pi}$ are the screening masses of the anomalous and
regular pions and $\rho_{\eta'}$ is the mass-scale that governs the low energy
fluctuations of the anomalous symmetry. We estimate that $r \sim 7 $ in our
model. This suggests that a strong anomaly at the two-flavor QCD chiral phase
transition is necessary to wash out the first order transition.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:52:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chandrasekharan",
"Shailesh",
"",
"Duke University"
],
[
"Mehta",
"Abhijit C.",
"",
"Duke University"
]
] |
0705.0618 | Alister W. Graham | Alister W. Graham | The Black Hole Mass - Spheroid Luminosity relation | 12 pages, to appaer in MNRAS | Mon.Not.Roy.Astron.Soc.379:711-722,2007 | 10.1111/j.1365-2966.2007.11950.x | null | astro-ph | null | The differing M_bh-Luminosity relations presented in McLure & Dunlop, Marconi
& Hunt and Erwin et al. have been investigated. A number of issues have been
identified and addressed in each of these studies, including but not limited
to: the removal of a dependency on the Hubble constant; a correction for dust
attenuation in the bulges of disc galaxies; the identification of lenticular
galaxies previously treated as elliptical galaxies; and application of the same
(Y|X) regression analysis. These adjustments result in relations which now
predict similar black hole masses. The optimal K-band relation is
log(M_bh/M_sun) = -0.37(+/-0.04)[M_K +24] + 8.29(+/-0.08), with a total (not
intrinsic) scatter in log M_bh equal to 0.33 dex. This level of scatter is
similar to the value of 0.34 dex from the M_bh-sigma relation of Tremaine et
al. and compares favourably with the value of 0.31 dex from the M_bh-n relation
of Graham & Driver. Using different photometric data, consistent relations in
the B- and R-band are also provided, although we do note that the small (N=13)
R-band sample used by Erwin et al. is found here to have a slope of
-0.30(+/-0.06) and a total scatter of 0.31 dex. Performing a symmetrical
regression on the larger K-band sample gives a slope of -0.40, implying M_bh ~
L^{1.00}. Implications for galaxy-black hole coevolution, in terms of dry
mergers, are briefly discussed, as are predictions for intermediate mass black
holes. Finally, as previously noted by Tundo et al., a potential bias in the
galaxy sample used to define the M_bh-L relations is shown and a corrective
formula provided.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:52:58 GMT"
},
{
"version": "v2",
"created": "Sun, 6 May 2007 01:56:03 GMT"
}
] | 2012-04-26T00:00:00 | [
[
"Graham",
"Alister W.",
""
]
] |
0705.0619 | Sergey P. Emelyanov | Sergey Emelyanov | Optical detection of anyons in an integer quantum Hall system | This paper has been withdrawn by the author because further
experiments show incorrectness of the proposed interpretation | null | null | null | cond-mat.mes-hall cond-mat.other | null | Further experiments showed the incorrectness of proposed interpretation. We
have studied an in-plane resonant photo-response of an integer quantum Hall
system in which time-reversal and parity symmetries are broken. The response of
initially homogeneous system exhibits a complicate spatial structure sensitive
to the system macroscopic sizes. Conceptually, the effect is explained by the
large-scale quantum entanglement originated from an indistinguishable particle
statistics. The concept is supported by the demonstration of
entanglement-related transfer of information in the system interior.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 12:54:22 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2007 07:04:32 GMT"
},
{
"version": "v3",
"created": "Fri, 1 Jun 2007 14:17:09 GMT"
},
{
"version": "v4",
"created": "Tue, 13 Apr 2010 13:20:16 GMT"
},
{
"version": "v5",
"created": "Mon, 11 Feb 2013 13:06:08 GMT"
}
] | 2013-02-12T00:00:00 | [
[
"Emelyanov",
"Sergey",
""
]
] |
0705.0620 | Dale Li | Dale Li, A. E. Dementyev, Yanqun Dong, R. G. Ramos, and S. E. Barrett | Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses | null | null | null | null | quant-ph | null | This submission has been withdrawn by arXiv administrators because it is a
duplicate of 0705.0667.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:54:25 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Li",
"Dale",
""
],
[
"Dementyev",
"A. E.",
""
],
[
"Dong",
"Yanqun",
""
],
[
"Ramos",
"R. G.",
""
],
[
"Barrett",
"S. E.",
""
]
] |
0705.0621 | Akira Chikamatsu | A. Chikamatsu, H. Wadati, H. Kumigashira, M. Oshima, A. Fujimori, M.
Lippmaa, K. Ono, M. Kawasaki, and H. Koinuma | Gradual Disappearance of the Fermi Surface near the Metal-Insulator
Transition in La$_{1-x}$Sr$_{x}$MnO$_{3}$ | 11 pages, 4 figures | Phys. Rev. B 76, 201103(R) (2007). | 10.1103/PhysRevB.76.201103 | null | cond-mat.str-el | null | We report the first observation of changes in the electronic structure of
La$_{1-x}$Sr$_{x}$MnO$_{3}$ (LSMO) across the filling-control metal-insulator
(MI) transition by means of in situ angle-resolved photoemission spectroscopy
(ARPES) of epitaxial thin films. The Fermi surface gradually disappears near
the MI transition by transferring the spectral weight from the coherent band
near the Fermi level ($E_{F}$) to the lower Hubbard band, whereas a pseudogap
behavior also exists in the ARPES spectra in the close vicinity of $E_{F}$ for
the metallic LSMO. These results indicate that the spectral weight transfer
derived from strong electron-electron interaction dominates the gap formation
in LSMO associated with the filling-control MI transition.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:12:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chikamatsu",
"A.",
""
],
[
"Wadati",
"H.",
""
],
[
"Kumigashira",
"H.",
""
],
[
"Oshima",
"M.",
""
],
[
"Fujimori",
"A.",
""
],
[
"Lippmaa",
"M.",
""
],
[
"Ono",
"K.",
""
],
[
"Kawasaki",
"M.",
""
],
[
"Koinuma",
"H.",
""
]
] |
0705.0622 | Peter Markos | P. Markos and L. Schweitzer | Critical conductance of two-dimensional chiral systems with random
magnetic flux | to appear in Phys. Rev. B | Phys. Rev. B 76, 115318 (2007) | 10.1103/PhysRevB.76.115318 | null | cond-mat.mes-hall | null | The zero temperature transport properties of two-dimensional lattice systems
with static random magnetic flux per plaquette and zero mean are investigated
numerically. We study the two-terminal conductance and its dependence on
energy, sample size, and magnetic flux strength. The influence of boundary
conditions and of the oddness of the number of sites in the transverse
direction is also studied. We confirm the existence of a critical chiral state
in the middle of the energy band and calculate the critical exponent nu=0.35
+/- 0.03 for the divergence of the localization length. The sample averaged
scale independent critical conductance <g>_c turns out to be a function of the
amplitude of the flux fluctuations whereas the variance of the respective
conductance distributions appears to be universal. All electronic states
outside of the band center are found to be localized.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:18:06 GMT"
},
{
"version": "v2",
"created": "Tue, 8 May 2007 08:47:47 GMT"
},
{
"version": "v3",
"created": "Thu, 23 Aug 2007 13:54:53 GMT"
}
] | 2010-10-01T00:00:00 | [
[
"Markos",
"P.",
""
],
[
"Schweitzer",
"L.",
""
]
] |
0705.0623 | J. M. Barr | J. M. Barr (1), A. G. Bedregal (1), A. Aragon-Salamanca (1), M. R.
Merrifield (1), S. P. Bamford (1,2) ((1) School of Physics and Astronomy,
University of Nottingham, (2) Institute of Cosmology and Gravitation,
University of Portsmouth) | The formation of S0 galaxies: evidence from globular clusters | 6 pages, 4 figures, accepted for publication in Astronomy &
Astrophysics | null | 10.1051/0004-6361:20077151 | null | astro-ph | null | We test the theory that lenticular (S0) galaxies form from spirals whose star
formation has been shut down. We use the globular cluster specific frequency
S_N, defined as the number of globular clusters normalised by the galaxy
luminosity as a diagnostic. NTT/EMMI long-slit spectroscopic observations of 11
S0 galaxies at z < 0.006 are used to measure the absorption-line indices,
Hdelta, Hgamma, Mgb, Fe5270 and Fe5335 within the central r_e/8. By inverting
single-stellar population models, luminosity-weighted mean ages, metallicities
and alpha-element abundance ratios are derived. We estimate the amount of
fading a galaxy has undergone by comparing each galaxy's S_N with its deviation
from the mean spiral S_N. Galaxies with higher S_N have older stellar
populations. Moreover, we find that the zero-point and amount of fading is
consistent with a scenario where lenticulars are formed by the quenching of
star formation in spiral galaxies. Our data also rule out any formation method
for S0s which creates a large number of new globular clusters. We confirm that
previous results showing a relationship between S_N and color are driven by the
S_N - Age relation. Five galaxies show detectable Hbeta, [OIII], Halpha or
[NII] emission lines. However, only in the two youngest galaxies is this
emission unambiguously from star formation. Our results are consistent with the
theory that S0 galaxies are formed when gas in normal spirals is removed,
possibly as a result of a change in environment. The on-going star formation in
the youngest galaxies hints that the timescale of quenching is ~< 1 Gyr. We
speculate, therefore, that the truncation of star formation is a rather gentle
process unlikely to involve a rapid burst of star formation.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:27:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barr",
"J. M.",
""
],
[
"Bedregal",
"A. G.",
""
],
[
"Aragon-Salamanca",
"A.",
""
],
[
"Merrifield",
"M. R.",
""
],
[
"Bamford",
"S. P.",
""
]
] |
0705.0624 | Gerhard Ecker | G. Ecker and C. Zauner | Tensor meson exchange at low energies | 20 pages, comparison with previous work updated, typos removed,
results unchanged, version to appear in EPJC | Eur.Phys.J.C52:315-323,2007 | 10.1140/epjc/s10052-007-0372-x | UWThPh-2007-10 | hep-ph | null | We complete the analysis of meson resonance contributions to chiral
low-energy constants of O(p^4) by including all quark-antiquark bound states
with orbital angular momentum less or equal to one. Different tensor meson
Lagrangians used in previous work are shown to produce the same final results
for the low-energy constants once QCD short-distance constraints are properly
implemented. We also discuss the possible relevance of axial-vector mesons with
odd C-parity.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:39:28 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 12:31:42 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Jul 2007 11:28:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ecker",
"G.",
""
],
[
"Zauner",
"C.",
""
]
] |
0705.0625 | Yun-Su Kim | Yun-Su Kim | N^p Spaces | 9 pages | null | null | null | math.OA math.FA | null | We introduce a new norm, called $N^{p}$-norm $(1\leq{p}<\infty)$ on a space
$N^{p}(V,W)$ where $V$ and $W$ are abstract operator spaces. By proving some
fundamental properties of the space $N^{p}(V,W)$, we also obtain that if $W$ is
complete, then the space $N^{p}(V,W)$ is also a Banach space with respect to
this norm for $1\leq{p}<\infty$.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:49:41 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 03:51:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kim",
"Yun-Su",
""
]
] |
0705.0626 | Daniele Coslovich | D. Coslovich and G. Pastore | Understanding fragility in supercooled Lennard-Jones mixtures. I.
Locally preferred structures | 14 pages, 14 figures, minor revisions, one figure added | J. Chem. Phys. 127, 124504 (2007) | 10.1063/1.2773716 | null | cond-mat.stat-mech cond-mat.soft | null | We reveal the existence of systematic variations of isobaric fragility in
different supercooled Lennard-Jones binary mixtures by performing molecular
dynamics simulations. The connection between fragility and local structures in
the bulk is analyzed by means of a Voronoi construction. We find that clusters
of particles belonging to locally preferred structures form slow, long-lived
domains, whose spatial extension increases by decreasing temperature. As a
general rule, a more rapid growth, upon supercooling, of such domains is
associated to a more pronounced super-Arrhenius behavior, hence to a larger
fragility.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:49:44 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 14:26:22 GMT"
}
] | 2007-10-02T00:00:00 | [
[
"Coslovich",
"D.",
""
],
[
"Pastore",
"G.",
""
]
] |
0705.0627 | Takeo Kojima | B.Feigin, T.Kojima, J.Shiraishi, H.Watanabe | The Integrals of Motion for the Deformed W-Algebra Wqt(sl_N^) | Proceedings for Representation Theory 2006, Atami, Japan, p.102-114,
(2006), [ISBN4-9902328-2-8] | Proceedings for Representation Theory 2006 | null | null | math-ph math.MP | null | We review the deformed W-algebra Wqt(sl_N^) and its screening currents. We
explicitly construct the local integrals of motion I_n for this deformed
W-algebra. We explicitly construct the nonlocal integrals of motion G_n by
means of the screening currents. Our integrals of motion commute with each
other, and give the elliptic version of those for the Virasoro algebra and the
W-algebra W(sl_3^), obtained by V.Bazhanov, A.Hibberd, S.Khoroshkin, S.Lukyanov
and Al.Zamolodchikov.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:51:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Feigin",
"B.",
""
],
[
"Kojima",
"T.",
""
],
[
"Shiraishi",
"J.",
""
],
[
"Watanabe",
"H.",
""
]
] |
0705.0628 | Bryan Armentrout | B.K. Armentrout (1), S.B. Kraemer (1), T.J. Turner (2) ((1) Department
of Physics, Catholic University of America, (2) Joint Institute for
Astrophysics, Physics Department, University of Maryland Baltimore County) | A Photoionization Model For The Soft X-Ray Spectrum Of NGC 4151 | 49 pages, 7 tables, 17 figures, accepted for publication in ApJ | Astrophys.J.665:237-246,2007 | 10.1086/519512 | null | astro-ph | null | We present analysis of archival data from multiple XMM-Newton observations of
the Seyfert 1 galaxy NGC 4151. Spectral data from the RGS instruments reveal
several strong soft X-ray emission lines, chiefly from hydrogen-like and
helium-like oxygen, nitrogen, neon and carbon. Radiative recombination continua
(RRC) from oxygen and carbon are also detected. Our analysis suggests that the
emission data are consistent with photoionization. Using the CLOUDY
photoionization code, we found that, while a two-component, high column density
model (10e23 cm-2) with low covering factor proved adequate in reproducing all
detected Lyman series lines, it proved insufficient in modeling He-like
triplets observed (neon, oxygen, and nitrogen). If resonance line data were
ignored, the two-component model was sufficient to match flux from
intercombination and forbidden lines. However, with the inclusion of resonance
line data, He-like triplets could no longer be modeled with only two
components. We found that observed oxygen G and R ratios especially were
anomalous in parameter space investigated. We investigated, and were forced to
dismiss, the possibility that a third purely collisional component could be
responsible for enhanced resonance line contributions. We succeeded in modeling
the observed spectrum with the addition of a third, lower column density
(10e20.5 cm-2) component with non-zero microturbulence and high covering
factor. While sufficient to reproduce observed soft X-ray flux, our model faces
certain shortcomings, particularly in a less-than-ideal visual fit to the line
profile. Two of the three emission model components bear similarities to
components determined by Kraemer et al. (2005) in their study of NGC 4151
absorption spectra.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 13:52:50 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Armentrout",
"B. K.",
""
],
[
"Kraemer",
"S. B.",
""
],
[
"Turner",
"T. J.",
""
]
] |
0705.0629 | Daniele Coslovich | D. Coslovich and G. Pastore | Understanding fragility in supercooled Lennard-Jones mixtures. II.
Potential energy surface | 13 pages, 13 figures, minor revisions, one figure added | J. Chem. Phys. 127, 124505 (2007) | 10.1063/1.2773720 | null | cond-mat.stat-mech cond-mat.soft | null | We numerically investigated the connection between isobaric fragility and the
properties of high-order stationary points of the potential energy surface in
different supercooled Lennard-Jones mixtures. The increase of effective
activation energies upon supercooling appears to be driven by the increase of
average potential energy barriers measured by the energy dependence of the
fraction of unstable modes. Such an increase is sharper, the more fragile is
the mixture. Correlations between fragility and other properties of high-order
stationary points, including the vibrational density of states and the
localization features of unstable modes, are also discussed.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:01:31 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 14:27:58 GMT"
}
] | 2007-10-02T00:00:00 | [
[
"Coslovich",
"D.",
""
],
[
"Pastore",
"G.",
""
]
] |
0705.0630 | Andrei Nemilentsau | A.M. Nemilentsau, G.Ya. Slepyan, S.A. Maksimenko | Thermal Radiation From Carbon Nanotube in Terahertz Range | 5 pages, 3 figures | Phys. Rev. Lett. 99, 147403, 2007 | 10.1103/PhysRevLett.99.147403 | null | cond-mat.mes-hall | null | The thermal radiation from an isolated finite-length carbon nanotube (CNT) is
theoretically investigated both in near- and far-field zones. The formation of
the discrete spectrum in metallic CNTs in the terahertz range is demonstrated
due to the reflection of strongly slowed-down surface-plasmon modes from CNT
ends. The effect does not appear in semiconductor CNTs. The concept of CNT as a
thermal nanoantenna is proposed.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:36:12 GMT"
}
] | 2007-10-09T00:00:00 | [
[
"Nemilentsau",
"A. M.",
""
],
[
"Slepyan",
"G. Ya.",
""
],
[
"Maksimenko",
"S. A.",
""
]
] |
0705.0631 | Indranil Chakrabarty ic | Satyabrata Adhikari, A. K. Pati, Indranil Chakrabarty, B. S. Choudhury | Hybrid Quantum Cloning Machine | Accepted in Quantum Information Processing | Quantum Information Processing,Volume 6, Number 4, 2007 | null | null | quant-ph | null | In this work, we introduce a special kind of quantum cloning machine called
Hybrid quantum cloning machine. The introduced Hybrid quantum cloning machine
or transformation is nothing but a combination of pre-existing quantum cloning
transformations. In this sense it creates its own identity in the field of
quantum cloners. Hybrid quantum cloning machine can be of two types: (i) State
dependent and (ii) State independent or Universal. We study here the above two
types of Hybrid quantum cloning machines. Later we will show that the state
dependent hybrid quantum-cloning machine can be applied on only four input
states. We will also find in this paper another asymmetric universal quantum
cloning machine constructed from the combination of optimal universal B-H
quantum cloning machine and universal anti-cloning machine. The fidelities of
the two outputs are different and their values lie in the neighborhood of
${5/6} $
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:38:00 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Jun 2007 15:50:39 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Adhikari",
"Satyabrata",
""
],
[
"Pati",
"A. K.",
""
],
[
"Chakrabarty",
"Indranil",
""
],
[
"Choudhury",
"B. S.",
""
]
] |
0705.0632 | Glenn Barnich | Glenn Barnich, Andres Gomberoff | Dyons with potentials: duality and black hole thermodynamics | 33 pages Latex file, additional typos corrected, references added | Phys.Rev.D78:025025,2008 | 10.1103/PhysRevD.78.025025 | ULB-TH/07-14 | hep-th gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modified version of the double potential formalism for the electrodynamics
of dyons is constructed. Besides the two vector potentials, this manifestly
duality invariant formulation involves four additional potentials, scalar
potentials which appear as Lagrange multipliers for the electric and magnetic
Gauss constraints and potentials for the longitudinal electric and magnetic
fields. In this framework, a static dyon appears as a Coulomb-like solution
without string singularities. Dirac strings are needed only for the Lorentz
force law, not for Maxwell's equations. The magnetic charge no longer appears
as a topological conservation law but as a surface integral on a par with
electric charge. The theory is generalized to curved space. As in flat space,
the string singularities of dyonic black holes are resolved. As a consequence
all singularities are protected by the horizon and the thermodynamics is shown
to follow from standard arguments in the grand canonical ensemble.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:36:45 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Mar 2008 18:51:16 GMT"
},
{
"version": "v3",
"created": "Mon, 2 Jun 2008 18:34:12 GMT"
},
{
"version": "v4",
"created": "Wed, 9 Jul 2008 16:01:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barnich",
"Glenn",
""
],
[
"Gomberoff",
"Andres",
""
]
] |
0705.0633 | Votyakov Evgeny | E.V. Votyakov and E. Zienicke | Numerical study of liquid metal flow in a rectangular duct under the
influence of a heterogenous magnetic field | accepted for FDMP, 18 pages, 18 figures | FDMP, Vol. 3, No. 2, pp. 97-114 (2007) | null | null | physics.flu-dyn | null | The paper presents 3D numerical results for the laminar liquid metal flow in
a rectangular duct compared with experimental results. It is shown that the
magnetic interaction parameter $N$ is the main parameter governing the flow
provided turbulent pulsations are locally suppressed by magnetic field.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:40:13 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Votyakov",
"E. V.",
""
],
[
"Zienicke",
"E.",
""
]
] |
0705.0634 | Daniele Galli | Frank H. Shu, Ronald J. Allen, Susana Lizano, Daniele Galli | Formation of OB Associations in Galaxies | The Astrophysical Journal Letters, in press | null | 10.1086/519375 | null | astro-ph | null | We consider the formation of OB associations from two perspectives: (a) the
fractional gas consumption in star formation,epsilon, per dynamical time scale
t_dyn in a galaxy, and (b) the origin of the so-called Kennicutt-Schmidt law
that the rate of star formation per unit area is proportional to a power,
alpha, of the surface density in HI and H_2 gas when certain thresholds are
crossed. The empirical findings that epsilon is approximately 0.01 and alpha is
approximately 1.4 or 1.5 have simple explanations if the rate of star formation
is magnetically regulated. An empirical test of the ideas resides in an
analysis of why giant OB associations are ``strung out like pearls along the
arms" of spiral galaxies.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:40:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shu",
"Frank H.",
""
],
[
"Allen",
"Ronald J.",
""
],
[
"Lizano",
"Susana",
""
],
[
"Galli",
"Daniele",
""
]
] |
0705.0635 | Jean Cardinal | J. Cardinal, S. Collette, F. Hurtado, S. Langerman and B. Palop | Moving Walkways, Escalators, and Elevators | 16 pages. Presented at XII Encuentros de Geometria Computacional,
Valladolid, Spain | null | null | null | cs.CG | null | We study a simple geometric model of transportation facility that consists of
two points between which the travel speed is high. This elementary definition
can model shuttle services, tunnels, bridges, teleportation devices, escalators
or moving walkways. The travel time between a pair of points is defined as a
time distance, in such a way that a customer uses the transportation facility
only if it is helpful.
We give algorithms for finding the optimal location of such a transportation
facility, where optimality is defined with respect to the maximum travel time
between two points in a given set.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:52:06 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 11:30:09 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Cardinal",
"J.",
""
],
[
"Collette",
"S.",
""
],
[
"Hurtado",
"F.",
""
],
[
"Langerman",
"S.",
""
],
[
"Palop",
"B.",
""
]
] |
0705.0636 | J. Marshall Ash | Bruce Anderson, J. Marshall Ash, Roger Jones, Daniel G. Rider, Bahman
Saffari | Exponential sums with coefficients 0 or 1 and concentrated L^{p} norms | null | null | null | null | math.CA | null | Let f be a sum of exponentials of the form exp(2 pi i N x), where the N are
distinct integers. We call f an idempotent trigonometric polynomial (because
the convolution of f with itself is f) or, simply, an idempotent. We show that
for every p > 1, and every set E of the torus T = R/Z with |E| > 0, there are
idempotents concentrated on E in the Lp sense. More precisely, for each p > 1,
there is an explicitly calculated constant Cp > 0 so that for each E with |E| >
0 and epsilon > 0 one can find an idempotent f such that the pth root of the
ratio of the integral over E of the pth power of |f| to the integral over T of
the pth power of |f| is greater than Cp - epsilon. This is in fact a lower
bound result and, though not optimal, it is close to the best that our method
gives. We also give both heuristic and computational evidence for the still
open problem of whether the Lp concentration phenomenon fails to occur when p =
1.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:53:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Anderson",
"Bruce",
""
],
[
"Ash",
"J. Marshall",
""
],
[
"Jones",
"Roger",
""
],
[
"Rider",
"Daniel G.",
""
],
[
"Saffari",
"Bahman",
""
]
] |
0705.0637 | Matthias Fuchs | O. Henrich, A.M. Puertas, M. Sperl, J. Baschnagel, and M. Fuchs | Bond formation and slow heterogeneous dynamics in adhesive spheres with
long--ranged repulsion: Quantitative test of Mode Coupling Theory | 10 pages, 8 figures | Phys. Rev. E 76, 031404 (2007) | 10.1103/PhysRevE.76.031404 | null | cond-mat.soft cond-mat.stat-mech | null | A colloidal system of spheres interacting with both a deep and narrow
attractive potential and a shallow long-ranged barrier exhibits a prepeak in
the static structure factor. This peak can be related to an additional
mesoscopic length scale of clusters and/or voids in the system. Simulation
studies of this system have revealed that it vitrifies upon increasing the
attraction into a gel-like solid at intermediate densities. The dynamics at the
mesoscopic length scale corresponding to the prepeak represents the slowest
mode in the system. Using mode coupling theory with all input directly taken
from simulations, we reveal the mechanism for glassy arrest in the system at
40% packing fraction. The effects of the low-q peak and of polydispersity are
considered in detail. We demonstrate that the local formation of physical bonds
is the process whose slowing down causes arrest.
It remains largely unaffected by the large-scale heterogeneities, and sets
the clock for the slow cluster mode. Results from mode-coupling theory without
adjustable parameters agree semi-quantitatively with the local density
correlators but overestimate the lifetime of the mesoscopic structure (voids).
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:54:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Henrich",
"O.",
""
],
[
"Puertas",
"A. M.",
""
],
[
"Sperl",
"M.",
""
],
[
"Baschnagel",
"J.",
""
],
[
"Fuchs",
"M.",
""
]
] |
0705.0638 | Stephen Sawin | Dana Fine, Stephen Sawin | A Rigorous Path Integral for Supersymmetric Quantum Mechanics and the
Heat Kernel | 14 pages, LaTeX, no figs | Commun.Math.Phys.284:79-91,2008 | 10.1007/s00220-008-0606-2 | null | math-ph math.DG math.MP | null | In a rigorous construction of the path integral for supersymmetric quantum
mechanics on a Riemann manifold, based on B\"ar and Pf\"affle's use of
piecewise geodesic paths, the kernel of the time evolution operator is the heat
kernel for the Laplacian on forms. The path integral is approximated by the
integral of a form on the space of piecewise geodesic paths which is the
pullback by a natural section of Mathai and Quillen's Thom form of a bundle
over this space.
In the case of closed paths, the bundle is the tangent space to the space of
geodesic paths, and the integral of this form passes in the limit to the
supertrace of the heat kernel.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 14:58:03 GMT"
},
{
"version": "v2",
"created": "Tue, 20 Nov 2007 15:54:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fine",
"Dana",
""
],
[
"Sawin",
"Stephen",
""
]
] |
0705.0639 | Tom Millar | T. J. Millar, C. Walsh, M. A. Cordiner, R. N\'i Chuim\'in and Eric
Herbst | Hydrocarbon anions in interstellar clouds and circumstellar envelopes | To be be published in The Astrophysical Journal Letters. 16 pages, 5
tables, 3 figures. Latex typos corrected | null | 10.1086/519376 | null | astro-ph | null | The recent detection of the hydrocarbon anion C6H- in the interstellar medium
has led us to investigate the synthesis of hydrocarbon anions in a variety of
interstellar and circumstellar environments. We find that the anion/neutral
abundance ratio can be quite large, on the order of at least a few percent,
once the neutral has more than five carbon atoms. Detailed modeling shows that
the column densities of C6H- observed in IRC+10216 and TMC-1 can be reproduced.
Our calculations also predict that other hydrocarbon anions, such as C4H- and
C8H-, are viable candidates for detection in IRC+10216, TMC-1 and
photon-dominated regions such as the Horsehead Nebula.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:13:47 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 21:52:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Millar",
"T. J.",
""
],
[
"Walsh",
"C.",
""
],
[
"Cordiner",
"M. A.",
""
],
[
"Chuimín",
"R. Ní",
""
],
[
"Herbst",
"Eric",
""
]
] |
0705.0640 | Bin Meng | Bin Meng | Additive preserving rank one maps on Hilbert $C^\ast$-modules | 9 pages | null | null | null | math.OA | null | In this paper, we characterize a class of additive maps on Hilbert
$C^\ast$-modules which maps a "rank one" adjointable operators to another rank
one operators.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:02:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Meng",
"Bin",
""
]
] |
0705.0641 | Armen M. Gulian | A. M. Gulian, V. R. Nikoghosyan, D. Van Vechten, and K. S. Wood | Simultaneous recording of two- and four-probe resistive transitions in
doped laser-processed Sr-Ru-O | null | null | 10.3103/S1068337207060187 | null | cond-mat.supr-con | null | To confirm previously reported evidence of high-temperature superconductivity
in laser processed Sr-Ru-O, we performed simultaneous two-probe and four-probe
resistive measurements using bar-geometry samples. A superconducting-type
transition with an onset at about 250K was recorded in one of the samples,
consistent with our previously reported measurements in the X-bridge geometry.
Some compositional details of the samples are also provided which were not
known at the time of previous web-publication.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:08:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gulian",
"A. M.",
""
],
[
"Nikoghosyan",
"V. R.",
""
],
[
"Van Vechten",
"D.",
""
],
[
"Wood",
"K. S.",
""
]
] |
0705.0642 | Toby Moore | T J T Moore, D E Bretherton, T Fujiyoshi, N A Ridge, J Allsopp, M G
Hoare, S L Lumsden, J S Richer | The star-forming content of the W3 giant molecular cloud | 13 pages, 8 figures, 1 table (full source table available on
request). Accepted for publication in Monthly Notices of the Royal
Astronomical Society (Main Journal) | Mon.Not.Roy.Astron.Soc.379:663-673,2007 | 10.1111/j.1365-2966.2007.11941.x | null | astro-ph | null | We have surveyed a ~0.9-square-degree area of the W3 giant molecular cloud
and star-forming region in the 850-micron continuum, using the SCUBA bolometer
array on the James Clerk Maxwell Telescope. A complete sample of 316 dense
clumps was detected with a mass range from around 13 to 2500 Msun. Part of the
W3 GMC is subject to an interaction with the HII region and fast stellar winds
generated by the nearby W4 OB association. We find that the fraction of total
gas mass in dense, 850-micron traced structures is significantly altered by
this interaction, being around 5% to 13% in the undisturbed cloud but ~25 - 37%
in the feedback-affected region. The mass distribution in the detected clump
sample depends somewhat on assumptions of dust temperature and is not a simple,
single power law but contains significant structure at intermediate masses.
This structure is likely to be due to crowding of sources near or below the
spatial resolution of the observations. There is little evidence of any
difference between the index of the high-mass end of the clump mass function in
the compressed region and in the unaffected cloud. The consequences of these
results are discussed in terms of current models of triggered star formation.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:11:30 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Moore",
"T J T",
""
],
[
"Bretherton",
"D E",
""
],
[
"Fujiyoshi",
"T",
""
],
[
"Ridge",
"N A",
""
],
[
"Allsopp",
"J",
""
],
[
"Hoare",
"M G",
""
],
[
"Lumsden",
"S L",
""
],
[
"Richer",
"J S",
""
]
] |
0705.0643 | Laurette S. Tuckerman | Piotr Boronski | Spectral method for matching exterior and interior elliptic problems | null | Journal of Computational Physics 225, 449-463 (2007) | 10.1016/j.jcp.2006.12.005 | null | math.NA physics.comp-ph | null | A spectral method is described for solving coupled elliptic problems on an
interior and an exterior domain. The method is formulated and tested on the
two-dimensional interior Poisson and exterior Laplace problems, whose solutions
and their normal derivatives are required to be continuous across the
interface. A complete basis of homogeneous solutions for the interior and
exterior regions, corresponding to all possible Dirichlet boundary values at
the interface, are calculated in a preprocessing step. This basis is used to
construct the influence matrix which serves to transform the coupled boundary
conditions into conditions on the interior problem. Chebyshev approximations
are used to represent both the interior solutions and the boundary values. A
standard Chebyshev spectral method is used to calculate the interior solutions.
The exterior harmonic solutions are calculated as the convolution of the
free-space Green's function with a surface density; this surface density is
itself the solution to an integral equation which has an analytic solution when
the boundary values are given as a Chebyshev expansion. Properties of Chebyshev
approximations insure that the basis of exterior harmonic functions represents
the external near-boundary solutions uniformly. The method is tested by
calculating the electrostatic potential resulting from charge distributions in
a rectangle. The resulting influence matrix is well-conditioned and solutions
converge exponentially as the resolution is increased. The generalization of
this approach to three-dimensional problems is discussed, in particular the
magnetohydrodynamic equations in a finite cylindrical domain surrounded by a
vacuum.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:24:36 GMT"
}
] | 2007-11-22T00:00:00 | [
[
"Boronski",
"Piotr",
""
]
] |
0705.0644 | Miguel Megevand | Miguel Megevand, Ignacio Olabarrieta, Luis Lehner | Scalar field confinement as a model for accreting systems | 18 pages; accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav.24:3235-3258,2007 | 10.1088/0264-9381/24/13/007 | null | gr-qc | null | We investigate the possibility to localize scalar field configurations as a
model for black hole accretion. We analyze and resolve difficulties encountered
when localizing scalar fields in General Relativity. We illustrate this ability
with a simple spherically symmetric model which can be used to study features
of accreting shells around a black hole. This is accomplished by prescribing a
scalar field with a coordinate dependent potential. Numerical solutions to the
Einstein-Klein-Gordon equations are shown, where a scalar filed is indeed
confined within a region surrounding a black hole. The resulting spacetime can
be described in terms of simple harmonic time dependence.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:17:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Megevand",
"Miguel",
""
],
[
"Olabarrieta",
"Ignacio",
""
],
[
"Lehner",
"Luis",
""
]
] |
0705.0645 | Carlotta Pittori | Carlotta Pittori, Elisabetta Cavazzuti, Sergio Colafrancesco, Paolo
Giommi | Blazar Duty-Cycle at gamma-ray Frequecies: Constraints from
Extragalactic Background Radiation and Prospects for AGILE and GLAST | 4 pages, 5 figures, 3 tables. Proceedings of: "The Multi-Messenger
Approach to High-Energy Gamma-Ray Sources" (Barcelona 2006) | Astrophys.Space Sci.309:89-94,2007 | 10.1007/s10509-007-9458-z | null | astro-ph | null | We take into account the constraints from the observed extragalactic
gamma-ray background to estimate the maximum duty cycle allowed for a selected
sample of WMAP Blazars, in order to be detectable by AGILE and GLAST gamma-ray
experiments. For the nominal sensitivity values of both instruments, we
identify a subset of sources which can in principle be detectable also in a
steady state without over-predicting the extragalactic background. This work is
based on the results of a recently derived Blazar radio LogN-LogS obtained by
combining several multi-frequency surveys.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:19:37 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Pittori",
"Carlotta",
""
],
[
"Cavazzuti",
"Elisabetta",
""
],
[
"Colafrancesco",
"Sergio",
""
],
[
"Giommi",
"Paolo",
""
]
] |
0705.0646 | David Bailin | David Bailin and Alex Love | Almost the supersymmetric Standard Model from intersecting D6-branes on
the Z_6' orientifold | 8 pages, no figures | Phys.Lett.B651:324-328,2007; Erratum-ibid.B658:292-294,2008 | 10.1016/j.physletb.2007.06.042 10.1016/j.physletb.2007.11.014 | null | hep-th | null | Intersecting stacks of supersymmetric fractional branes on the Z_6'
orientifold may be used to construct the supersymmetric Standard Model. If a,b
are the stacks that generate the SU(3)_{colour} and SU(2)_L gauge particles,
then, in order to obtain {\em just} the chiral spectrum of the (supersymmetric)
Standard Model (with non-zero Yukawa couplings to the Higgs mutiplets), it is
necessary that the number of intersections a \cap b of the stacks a and b, and
the number of intersections a \cap b' of a with the orientifold image b' of b
satisfy (a \cap b,a \cap b')=(2,1) or (1,2). It is also necessary that there is
no matter in symmetric representations of the gauge group, and not too much
matter in antisymmetric representations, on either stack. Fractional branes
having all of these properties may be constructed on the Z_6' orientifold. We
construct a (four-stack) model with two further stacks, each with just a single
brane, which has precisely the matter spectrum of the supersymmetric Standard
Model, including a single pair of Higgs doublets. However, the gauge group is
SU(3)_{\rm colour} x SU(2)_L x U(1)_Y x U(1)_H. Only the Higgs doublets are
charged with respect to U(1)_H.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:35:40 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Bailin",
"David",
""
],
[
"Love",
"Alex",
""
]
] |
0705.0647 | Christopher Springob | Christopher M. Springob (Naval Research Lab), Karen L. Masters (CfA),
Martha P. Haynes, Riccardo Giovanelli (Cornell), Christian Marinoni
(Provence) | SFI++ II: A New I-band Tully-Fisher Catalog, Derivation of Peculiar
Velocities and Dataset Properties | 14 pages, 6 figures, 4 external online tables, accepted for
publication in ApJS | Erratum-ibid 182:474-475,2009 | 10.1088/0067-0049/182/1/474 | null | astro-ph | null | We present the SFI++ dataset, a homogeneously derived catalog of photometric
and rotational properties and the Tully-Fisher distances and peculiar
velocities derived from them. We make use of digital optical images, optical
long-slit spectra, and global HI line profiles to extract parameters of
relevance to disk scaling relations, incorporating several previously published
datasets as well as a new photometric sample of some 2000 objects. According to
the completeness of available redshift samples over the sky area, we exploit
both a modified percolation algorithm and the Voronoi-Delaunay method to assign
individual galaxies to groups as well as clusters, thereby reducing scatter
introduced by local orbital motions. We also provide corrections to the
peculiar velocities for both homogeneous and inhomogeneous Malmquist bias,
making use of the 2MASS Redshift Survey density field to approximate large
scale structure. We summarize the sample selection criteria, corrections made
to raw observational parameters, the grouping techniques, and our procedure for
deriving peculiar velocities. The final SFI++ peculiar velocity catalog of 4861
field and cluster galaxies is large enough to permit the study not just of the
global statistics of large scale flows but also of the {\it details} of the
local velocity field.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:20:11 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Springob",
"Christopher M.",
"",
"Naval Research Lab"
],
[
"Masters",
"Karen L.",
"",
"CfA"
],
[
"Haynes",
"Martha P.",
"",
"Cornell"
],
[
"Giovanelli",
"Riccardo",
"",
"Cornell"
],
[
"Marinoni",
"Christian",
"",
"Provence"
]
] |
0705.0648 | Daniel Urban | Daniel Urban, Matthias Braun, and J\"urgen K\"onig | Theory of a Magnetically-Controlled Quantum-Dot Spin Transistor | 7 pages, 6 figures | Phys. Rev. B 76, 125306 (2007) | 10.1103/PhysRevB.76.125306 | null | cond-mat.mes-hall | null | We examine transport through a quantum dot coupled to three ferromagnetic
leads in the regime of weak tunnel coupling. A finite source-drain voltage
generates a nonequilibrium spin on the otherwise non-magnetic quantum dot. This
spin accumulation leads to magnetoresistance. A ferromagnetic but current-free
base electrode influences the quantum-dot spin via incoherent spin-flip
processes and coherent spin precession. As the dot spin determines the
conductance of the device, this allows for a purely magnetic transistor-like
operation. We analyze the effect of both types of processes on the electric
current in different geometries.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:26:01 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 16:10:02 GMT"
}
] | 2007-09-28T00:00:00 | [
[
"Urban",
"Daniel",
""
],
[
"Braun",
"Matthias",
""
],
[
"König",
"Jürgen",
""
]
] |
0705.0649 | Nicolas Regnault | N. Regnault, R. Ferreira, G. Bastard | Broadening effects due to alloy scattering in Quantum Cascade Lasers | 7 pages, 8 figures | null | 10.1103/PhysRevB.76.165121 | null | cond-mat.other | null | We report on calculations of broadening effects in QCL due to alloy
scattering. The output of numerical calculations of alloy broadened Landau
levels compare favorably with calculations performed at the self-consistent
Born approximation. Results for Landau level width and optical absorption are
presented. A disorder activated forbidden transition becomes significant in the
vicinity of crossings of Landau levels which belong to different subbands. A
study of the time dependent survival probability in the lowest Landau level of
the excited subband is performed. It is shown that at resonance the population
relaxation occurs in a subpicosecond scale.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:33:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Regnault",
"N.",
""
],
[
"Ferreira",
"R.",
""
],
[
"Bastard",
"G.",
""
]
] |
0705.0650 | Kiyoshi Hayasaka | K.Hayasaka, et al (for the Belle collaboration) | New Search for tau -> mu gamma and tau -> e gamma Decays at Belle | 15 pages, 13 figures, the exponent of the upper limit for the tau ->
e gamma in the abstract is corrected | Phys.Lett.B666:16-22,2008 | 10.1016/j.physletb.2008.06.056 | Belle-preprint 2007-6, KEK-preprint 2006-69 | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a search for the lepton flavor violating tau- -> mu- gamma and
tau- -> e- gamma decays based on 535/fb of data accumulated at the Belle
experiment. No signal is found and we set 90% confidence level upper limits on
the branching ratios Br(tau- -> mu- gamma) < 4.5x10^-8 and Br(tau- -> e- gamma)
< 1.2x10^-7.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:34:23 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Jun 2015 04:44:16 GMT"
}
] | 2015-06-11T00:00:00 | [
[
"Hayasaka",
"K.",
""
]
] |
0705.0651 | Geert Brocks | Paul C. Rusu, Gianluca Giovannetti, and Geert Brocks | Dipole Formation at Interfaces of Alkanethiolate Self-assembled
Monolayers and Ag(111) | 11 pages, 4 figures, 6 tables | J. Phys. Chem. C 111, 14448-14456 (2007) | 10.1021/jp073420k | null | cond-mat.mtrl-sci cond-mat.soft | null | The formation of interface dipoles in self-assembled monolayers (SAMs) of
--CH$_3$ and --CF$_3$ terminated short-chain alkanethiolates on Ag(111) is
studied by means of density functional theory calculations. The interface
dipoles are characterized by monitoring the change in the surface work function
upon adsorption of the SAM. We compare results obtained for SAMs in structures
with a different packing density of molecules, i.e. {$(\sqrt{7}\times\sqrt{7})
R19.1^{\circ}$}, {$(\sqrt{3}\times\sqrt{3}) R30^{\circ}$}, and {p(2$\times$2)}.
The work function of alkanethiolate SAMs on silver depends weakly on the
packing density; that of fluorinatedalkanethiolates shows a stronger
dependance. The results are analyzed in terms of two nearly independent
contributions to the interface dipole. These originate respectively from the
molecular dipoles and from a charge transfer between the metal surface and the
molecules. The charge transfer is determined by the silver--sulfur bond and it
is independent of the electronegativity of the molecules.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:39:09 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Rusu",
"Paul C.",
""
],
[
"Giovannetti",
"Gianluca",
""
],
[
"Brocks",
"Geert",
""
]
] |
0705.0652 | Per Arne Rikvold | G.M Buendia (U. Simon Bolivar), P.A. Rikvold (Florida State U.), M.
Kolesik (U. of Arizona), K. Park (Virginia Tech), M.A. Novotny (Mississippi
State U.) | Nanostructure and velocity of field-driven solid-on-solid interfaces
moving under a phonon-assisted dynamic | 18 pages, 11 figures | Phys. Rev. B 76, 045422 (2007) [10 pages)]. | 10.1103/PhysRevB.76.045422 | null | cond-mat.stat-mech cond-mat.mtrl-sci | null | The nanoscopic structure and the stationary propagation velocity of
(1+1)-dimensional solid-on-solid interfaces in an Ising lattice-gas model,
which are driven far from equilibrium by an applied force, such as a magnetic
field or a difference in (electro)chemical potential, are studied by an
analytic nonlinear-response approximation together with kinetic Monte Carlo
simulations. Here we consider the case that the system is coupled to a
two-dimensional phonon bath. In the resulting dynamic, transitions that
conserve the system energy are forbidden, and the effects of the applied force
and the interaction energies do not factorize (a so-called hard dynamic). In
full agreement with previous general theoretical results we find that the local
interface width changes dramatically with the applied force. However, in
contrast with other hard dynamics, this change is nonmonotonic in the driving
force. However, significant differences between theory and simulation are found
near two special values of the driving force, where certain transitions allowed
by the solid-on-solid model become forbidden by the phonon-assisted dynamic.
Our results represent a significant step toward providing a solid physical
foundation for kinetic Monte Carlo simulations.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:47:56 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Buendia",
"G. M",
"",
"U. Simon Bolivar"
],
[
"Rikvold",
"P. A.",
"",
"Florida State U."
],
[
"Kolesik",
"M.",
"",
"U. of Arizona"
],
[
"Park",
"K.",
"",
"Virginia Tech"
],
[
"Novotny",
"M. A.",
"",
"Mississippi\n State U."
]
] |
0705.0653 | Yury Arlinskii | Yury Arlinskii | The Kalman--Yakubovich--Popov inequality for passive discrete
time-invariant systems | null | null | null | null | math.SP math.FA | null | We consider the Kalman - Yakubovich - Popov (KYP) inequality \[
\begin{pmatrix} X-A^* XA-C^*C & -A^*X B- C^*D\cr -B^*X A-D^* C & I- B^*X B-D^*D
\end{pmatrix} \ge 0 \] for contractive operator matrices $ \begin{pmatrix}
A&B\cr C &D \end{pmatrix}:\begin{pmatrix}\mathfrak{H}\cr\mathfrak{M}
\end{pmatrix}\to\begin{pmatrix}\mathfrak{H}\cr\mathfrak{N} \end{pmatrix}, $
where $\mathfrak{H},$ $\mathfrak{M}$, and $\mathfrak{N}$ are separable Hilbert
spaces. We restrict ourselves to the solutions $X$ from the operator interval
$[0, I_\mathfrak{H}]$. Several equivalent forms of KYP are obtained. Using the
parametrization of the blocks of contractive operator matrices, the Kre\u{\i}n
shorted operator, and the M\"obius representation of the Schur class
operator-valued function we find several equivalent forms of the KYP
inequality. Properties of solutions are established and it is proved that the
minimal solution of the KYP inequality satisfies the corresponding algebraic
Riccati equation and can be obtained by the iterative procedure with the
special choice of the initial point. In terms of the Kre\u{\i}n shorted
operators a necessary condition and some sufficient conditions for uniqueness
of the solution are established.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:40:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Arlinskii",
"Yury",
""
]
] |
0705.0654 | Mark Vries de | M.A.de Vries, K.V.Kamenev, W.A.Kockelmann, J.Sanchez-Benitez,
A.Harrison | The magnetic groundstate of an experimental $S=1/2$ kagom\'{e}
antiferromagnet | Thorough revision of manuscript. Added 1 figure. Manuscript submitted
to Physics Review Letters | null | 10.1103/PhysRevLett.100.157205 | null | cond-mat.str-el | null | We have carried out neutron powder-diffraction measurements on zinc
paratacamite Zn$_x$Cu$_{4-x}$(OH)$_6$Cl$_2$ with $x=1$, and studied the heat
capacity in fields of up to 9 T for $0.5 \leq x \leq 1$. The $x=1$ phase has
recently been shown to be an outstanding realisation of the $S=1/2$ kagom\'{e}
antiferromagnet. A weak mixing of Cu$^{2+}$/Zn$^{2+}$ between the Cu and the Zn
sites, corresponding to $\sim 9$% of all Cu$^{2+}$ for $x=1$, is observed using
neutron diffraction. This ``antisite disorder'' provides a consistent
explanation of the field dependence of the heat capacity for $0.8 \leq x \leq
1$. From comparison of the derived Cu$^{2+}$ occupancy of the Zn sites for $x =
0.8... 1$ with the magnetic susceptibility, we argue that for $x = 0.8... 1$
zinc paratacamite is a spin liquid without a spin gap. The presence of unpaired
but nevertheless strongly interacting spins gives rise to a macroscopically
degenerate ground state manifold, with increasingly glassy dynamics as $x$ is
lowered.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:41:16 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 13:59:29 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Mar 2008 04:26:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Vries",
"M. A.",
""
],
[
"Kamenev",
"K. V.",
""
],
[
"Kockelmann",
"W. A.",
""
],
[
"Sanchez-Benitez",
"J.",
""
],
[
"Harrison",
"A.",
""
]
] |
0705.0655 | Lukasz Andrzej Glinka | L.A. Glinka, V.N. Pervushin | Hamiltonian Unification of General Relativity and Standard Model | 105 pages, 5 figures, 1 table, revised and added one figure | Concepts Phys. 5:31-155, 2008 | 10.2478/v10005-007-0030-y | null | gr-qc | null | The Hamiltonian approach to the General Relativity and the Standard Model is
studied in the context of its consistency with the Newton law, the Higgs
effect, the Hubble cosmological evolution and the Cosmic Microwave Background
radiation physics.
The version of the Higgs potential is proposed, where its constant parameter
is replaced by the dynamic zeroth Fourier harmonic of the very Higgs field. In
this model, the extremum of the Coleman--Weinberg effective potential obtained
from the unit vacuum--vacuum transition amplitude immediately predicts mass of
Higgs field and removes tremendous vacuum cosmological density.
We show that the relativity principles unambiguously treat the Planck epoch,
in the General Relativity, as the present-day one. It was shown that there are
initial data of the Electro-Weak epoch compatible with supposition that all
particles in the Universe are final products of decays of primordial Higgs
particles and W-, Z-vector bosons created from vacuum at the instant treated as
the "Big-Bang".
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 18:21:55 GMT"
},
{
"version": "v2",
"created": "Sat, 5 May 2007 14:42:45 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Jul 2007 10:35:21 GMT"
},
{
"version": "v4",
"created": "Wed, 25 Jul 2007 13:05:56 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Glinka",
"L. A.",
""
],
[
"Pervushin",
"V. N.",
""
]
] |
0705.0656 | Mikhail Kozlov | U. I. Safronova, M. S. Safronova and M. G. Kozlov | High-precision calculations of In I and Sn II atomic properties | 10 pages, accepted to PRA; v2: Introduction changed, references added | PRA, 76, 022501 (2007) | 10.1103/PhysRevA.76.022501 | null | physics.atom-ph | null | We use all-order relativistic many-body perturbation theory to study 5s^2 nl
configurations of In I and Sn II. Energies, E1-amplitudes, and hyperfine
constants are calculated using all-order method, which accounts for single and
double excitations of the Dirac-Fock wave functions.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:41:16 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 07:33:25 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Safronova",
"U. I.",
""
],
[
"Safronova",
"M. S.",
""
],
[
"Kozlov",
"M. G.",
""
]
] |
0705.0657 | Victor Chulaevsky | Victor Chulaevsky, Yuri Suhov | Anderson localisation for an interacting two-particle quantum system on
${\mathbb Z}$ | 38 pages; main results have been reported earlier on international
conferences | null | null | null | math-ph math.MP | null | We study spectral properties of a system of two quantum particles on an
integer lattice with a bounded short-range two-body interaction, in an external
random potential field $V(x,\omega)$ with independent, identically distributed
values. The main result is that if the common probability density $f$ of random
variables $V(x,\omega)$ is analytic in a strip around the real line and the
amplitude constant $g$ is large enough (i.e. the system is at high disorder),
then, with probability one, the spectrum of the two-particle lattice
Schroedinger operator $H(\omega)$ (bosonic or fermionic) is pure point, and all
eigen-functions decay exponentially. The proof given in this paper is based on
a refinement of a multiscale analysis (MSA) scheme proposed by von Dreifus and
Klein, adapted to incorporate lattice systems with interaction.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:52:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chulaevsky",
"Victor",
""
],
[
"Suhov",
"Yuri",
""
]
] |
0705.0658 | Jean B\'erard | Jean B\'erard and Alejandro Ram\'irez | Central Limit Theorem for the Excited Random Walk in dimension $d \geq
2$ | null | null | null | null | math.PR | null | We prove that a law of large numbers and a central limit theorem hold for the
excited random walk model in every dimension $d \geq 2$.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 15:58:27 GMT"
},
{
"version": "v2",
"created": "Sat, 5 May 2007 15:16:30 GMT"
},
{
"version": "v3",
"created": "Wed, 6 Jun 2007 10:41:26 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Bérard",
"Jean",
""
],
[
"Ramírez",
"Alejandro",
""
]
] |
0705.0659 | Antonio Laface | Cindy De Volder, Antonio Laface | Linear systems on a class of anticanonical rational threefolds | 19 pages, 1 figure, LaTeX | null | null | null | math.AG | null | Let X be the blow-up of the three dimensional complex projective space along
r general points of a smooth elliptic quartic curve B of P^3 and let L be any
line bundle of X. The aim of this paper is to provide an explicit algorithm for
determining the dimension of H^0(X,L).
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:08:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"De Volder",
"Cindy",
""
],
[
"Laface",
"Antonio",
""
]
] |
0705.0660 | Ranga-Ram Chary | Ranga-Ram Chary (SSC), Harry I. Teplitz (SSC), Mark E. Dickinson
(NOAO), David C. Koo (UCO/Lick), Emeric Le Floc'h (Hawaii), Delphine
Marcillac (Arizona), Casey Papovich (Arizona), Daniel Stern (JPL) | HUDF-JD2: Mid-infrared Evidence for a z~2 Luminous Infrared Galaxy | 20 pages, 6 figures (color), 3 tables, 2007, ApJ, 665 vol.1 (10
August) | Astrophys.J.665:257-264,2007 | 10.1086/519243 | null | astro-ph | null | The Hubble Ultra Deep Field source JD2 presented in Mobasher et al. (2005) is
an unusual galaxy that is very faint at all wavelengths shortward of 1.1
micron. Photometric redshift fits to data at 0.4 to 8 microns yield a
significant probability that it is an extremely massive galaxy at z~6.5. In
this paper we present new photometry at 16 microns and 22 micron from Spitzer
Infrared Spectrograph (IRS) peak-up imaging of the Great Observatories Origins
Deep Survey (GOODS) fields. We find that the spectral energy distribution shows
a factor of ~4 rise in flux density between the 16 micron and 22 micron
bandpass which is most likely due to the entrance of polycyclic aromatic
hydrocarbon emission features into the 22 micron and 24 micron passbands. The
flux ratio between these bandpasses can be best fit by a z~1.7 luminous
infrared galaxy with a bolometric luminosity of (2-6)\times10^{11} L_sun
corresponding to a star-formation rate of 80 M_sun/yr. The predicted flux
density values at other longer wavelengths are below the detection limits of
current instrumentation but such sources could potentially be detected in
lensed submillimeter surveys. Re-evaluation of the optical/near-infrared
photometry continues to favor z>6 photometric redshift solutions, but we argue
that the consistency of the multiwavelength parameters of this galaxy with
other dusty starbursts favor the z~2 mid-infrared photometric redshift. The
data presented here provide evidence that optically undetected near-infrared
sources which are detected at 24 microns are most likely dusty, starburst
galaxies at a redshift of z~2 with stellar masses >10^{10} M_sun.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:30:21 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Chary",
"Ranga-Ram",
"",
"SSC"
],
[
"Teplitz",
"Harry I.",
"",
"SSC"
],
[
"Dickinson",
"Mark E.",
"",
"NOAO"
],
[
"Koo",
"David C.",
"",
"UCO/Lick"
],
[
"Floc'h",
"Emeric Le",
"",
"Hawaii"
],
[
"Marcillac",
"Delphine",
"",
"Arizona"
],
[
"Papovich",
"Casey",
"",
"Arizona"
],
[
"Stern",
"Daniel",
"",
"JPL"
]
] |
0705.0661 | Vadim Zotev | V.S. Zotev, A.N. Matlashov, P.L. Volegov, A.V. Urbaitis, M.A. Espy,
R.H. Kraus Jr | SQUID-based instrumentation for ultra-low-field MRI | To appear in Proceedings of 11th International Superconductive
Electronics Conference (ISEC 2007); 8 pages, 11 figures | Superconductor Science and Technology 20, S367 (2007) | 10.1088/0953-2048/20/11/S13 | null | physics.med-ph physics.ins-det | null | Magnetic resonance imaging at ultra-low fields (ULF MRI) is a promising new
imaging method that uses SQUID sensors to measure the spatially encoded
precession of pre-polarized nuclear spin populations at a microtesla-range
measurement field. In this work, a seven-channel SQUID system designed for
simultaneous 3D ULF MRI and magnetoencephalography (MEG) is described. The
system includes seven second-order SQUID gradiometers, characterized by
magnetic field resolutions of 1.2 - 2.8 fT/rtHz. It is also equipped with five
sets of coils for 3D Fourier imaging with pre-polarization. Essential technical
details of the design are discussed. The system's ULF MRI performance is
demonstrated by multi-channel 3D images of a preserved sheep brain acquired at
46 microtesla measurement field with pre-polarization at 40 mT. The imaging
resolution is 2.5 mm x 2.5 mm x 5 mm. The ULF MRI images are compared to images
of the same brain acquired using conventional high-field MRI. Different ways to
improve imaging SNR are discussed.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:12:28 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jul 2007 18:33:24 GMT"
}
] | 2007-10-18T00:00:00 | [
[
"Zotev",
"V. S.",
""
],
[
"Matlashov",
"A. N.",
""
],
[
"Volegov",
"P. L.",
""
],
[
"Urbaitis",
"A. V.",
""
],
[
"Espy",
"M. A.",
""
],
[
"Kraus",
"R. H.",
"Jr"
]
] |
0705.0662 | Maurizio De Sanctis | M. De Sanctis | Manifestly covariant current matrix elements in the Point Form
Relativistic Hamiltonian Dynamics | 22 pages | null | null | null | nucl-th | null | A manifestly covariant expression for the current matrix elements of three
quark bound systems is derived in the framework of the Point Form Relativistic
Hamiltonian Dynamics. The relativistic impulse approximation is assumed in the
model. A critical comparison is made with other expressions usually given in
the literature.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:13:07 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"De Sanctis",
"M.",
""
]
] |
0705.0663 | Matteo Beccaria | Matteo Beccaria | Universality of three gaugino anomalous dimensions in N=4 SYM | 13 pages, JHEP style | JHEP 0706:054,2007 | 10.1088/1126-6708/2007/06/054 | null | hep-th | null | We study maximal helicity three gaugino operators in N=4 Super Yang-Mills
theory. We show that the lowest anomalous dimension of scaling operators with
generic finite spin can be expressed in terms of the universal anomalous
dimension appearing at twist-2. This statement is rigourously proved at three
loops. The reason for this universality between sectors with different twist is
the hidden psu(1|1) invariance of the su(2|1) subsector of the theory.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:15:54 GMT"
},
{
"version": "v2",
"created": "Sat, 5 May 2007 16:28:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Beccaria",
"Matteo",
""
]
] |
0705.0664 | Iliya Karlin | M. Colangeli, I.V. Karlin, M. Kroger | Hyperbolicity of exact hydrodynamics for three-dimensional linearized
Grad's equations | 5 pages, 2 figures | Phys. Rev. E 76, 022201 (2007) (4 pages) | 10.1103/PhysRevE.76.022201 | null | cond-mat.stat-mech | null | We extend a recent proof of hyperbolicity of the exact (to all orders in
Knudsen number) linear hydrodynamic equations [M. Colangeli et al, Phys. Rev. E
(2007), in press; arXiv:cond-mat/0703791v2] to the three-dimensional Grad's
moment system. A proof of an H-theorem is also presented.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:16:55 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Colangeli",
"M.",
""
],
[
"Karlin",
"I. V.",
""
],
[
"Kroger",
"M.",
""
]
] |
0705.0665 | Deepak Naidu | Deepak Naidu and Dmitri Nikshych | Lagrangian subcategories and braided tensor equivalences of twisted
quantum doubles of finite groups | 26 pages; several comments and references added | Comm. Math. Phys. 279 (2008), 845-872. | 10.1007/s00220-008-0441-5 | null | math.QA | null | We classify Lagrangian subcategories of the representation category of a
twisted quantum double of a finite group. In view of results of 0704.0195v2
this gives a complete description of all braided tensor equivalent pairs of
twisted quantum doubles of finite groups. We also establish a canonical
bijection between Lagrangian subcategories of the representation category of a
twisted quantum double of a finite group G and module categories over the
category of twisted G-graded vector spaces such that the dual tensor category
is pointed. This can be viewed as a quantum version of V. Drinfeld's
characterization of homogeneous spaces of a Poisson-Lie group in terms of
Lagrangian subalgebras of the double of its Lie bialgebra. As a consequence, we
obtain that two group-theoretical fusion categories are weakly Morita
equivalent if and only if their centers are equivalent as braided tensor
categories.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:18:46 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 22:05:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Naidu",
"Deepak",
""
],
[
"Nikshych",
"Dmitri",
""
]
] |
0705.0666 | Tom Michoel | Tom Michoel, Steven Maere, Eric Bonnet, Anagha Joshi, Yvan Saeys, Tim
Van den Bulcke, Koenraad Van Leemput, Piet van Remortel, Martin Kuiper,
Kathleen Marchal, Yves Van de Peer | Validating module network learning algorithms using simulated data | 13 pages, 6 figures + 2 pages, 2 figures supplementary information | BMC Bioinformatics 2007, 8(Suppl 2):S5 | 10.1186/1471-2105-8-S2-S5 | null | q-bio.QM q-bio.MN | null | In recent years, several authors have used probabilistic graphical models to
learn expression modules and their regulatory programs from gene expression
data. Here, we demonstrate the use of the synthetic data generator SynTReN for
the purpose of testing and comparing module network learning algorithms. We
introduce a software package for learning module networks, called LeMoNe, which
incorporates a novel strategy for learning regulatory programs. Novelties
include the use of a bottom-up Bayesian hierarchical clustering to construct
the regulatory programs, and the use of a conditional entropy measure to assign
regulators to the regulation program nodes. Using SynTReN data, we test the
performance of LeMoNe in a completely controlled situation and assess the
effect of the methodological changes we made with respect to an existing
software package, namely Genomica. Additionally, we assess the effect of
various parameters, such as the size of the data set and the amount of noise,
on the inference performance. Overall, application of Genomica and LeMoNe to
simulated data sets gave comparable results. However, LeMoNe offers some
advantages, one of them being that the learning process is considerably faster
for larger data sets. Additionally, we show that the location of the regulators
in the LeMoNe regulation programs and their conditional entropy may be used to
prioritize regulators for functional validation, and that the combination of
the bottom-up clustering strategy with the conditional entropy-based assignment
of regulators improves the handling of missing or hidden regulators.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:18:59 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Michoel",
"Tom",
""
],
[
"Maere",
"Steven",
""
],
[
"Bonnet",
"Eric",
""
],
[
"Joshi",
"Anagha",
""
],
[
"Saeys",
"Yvan",
""
],
[
"Bulcke",
"Tim Van den",
""
],
[
"Van Leemput",
"Koenraad",
""
],
[
"van Remortel",
"Piet",
""
],
[
"Kuiper",
"Martin",
""
],
[
"Marchal",
"Kathleen",
""
],
[
"Van de Peer",
"Yves",
""
]
] |
0705.0667 | Dale Li | Dale Li, A. E. Dementyev, Yanqun Dong, R. G. Ramos, and S. E. Barrett | Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses | 4 pages, 4 color figures, to appear in PRL May 2007 | Phys. Rev. Lett. 98, 190401 (2007) | 10.1103/PhysRevLett.98.190401 | null | quant-ph cond-mat.mes-hall | null | NMR spin echo measurements of C-13 in C60, Y-89 in Y2O3, and Si-29 in silicon
are shown to defy conventional expectations when more that one pi pulse is
used. Multiple pi-pulse echo trains may either freeze our or accelerate the
decay of the signal, depending on the pi-pulse phase. Average Hamiltonian
theory, combined with exact quantum calculations, reveals an intrinsic cause
for these coherent phenomena: the dipolar coupling has a many-body effect
during any real, finite pulse.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:56:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Li",
"Dale",
""
],
[
"Dementyev",
"A. E.",
""
],
[
"Dong",
"Yanqun",
""
],
[
"Ramos",
"R. G.",
""
],
[
"Barrett",
"S. E.",
""
]
] |
0705.0668 | Ewa Wawrzy\'nska | E. Wawrzynska, R. Coldea, E.M. Wheeler, I.I. Mazin, M.D. Johannes, T.
Sorgel, M. Jansen, R.M. Ibberson, P.G. Radaelli | Orbital degeneracy removed by charge order in triangular antiferromagnet
AgNiO2 | 4 pages including 4 eps figures, improved Fig 4, to appear in
Physical Review Letters | Physical Review Letters, 99 157204 (2007). | 10.1103/PhysRevLett.99.157204 | null | cond-mat.str-el | null | We report a high-resolution neutron diffraction study on the
orbitally-degenerate spin-1/2 hexagonal antiferromagnet AgNiO2. A structural
transition to a tripled unit cell with expanded and contracted NiO6 octahedra
indicates root(3) x root(3) charge order on the Ni triangular lattice. This
suggests charge order as a possible mechanism of lifting the orbital degeneracy
in the presence of charge fluctuations, as an alternative to Jahn-Teller
distortions. A novel magnetic ground state is observed at base temperatures
with the electron-rich S = 1 Ni sites arranged in alternating ferromagnetic
rows on a triangular lattice, surrounded by a honeycomb network of non-magnetic
and metallic Ni ions. We also report first-principles band-structure
calculations that explain microscopically the origin of these phenomena.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:19:56 GMT"
},
{
"version": "v2",
"created": "Sun, 6 May 2007 23:49:11 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Aug 2007 13:21:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wawrzynska",
"E.",
""
],
[
"Coldea",
"R.",
""
],
[
"Wheeler",
"E. M.",
""
],
[
"Mazin",
"I. I.",
""
],
[
"Johannes",
"M. D.",
""
],
[
"Sorgel",
"T.",
""
],
[
"Jansen",
"M.",
""
],
[
"Ibberson",
"R. M.",
""
],
[
"Radaelli",
"P. G.",
""
]
] |
0705.0669 | Anna Beliakova | Anna Beliakova | A Simplification of Combinatorial Link Floer Homology | 20 pages with figures, final version printed in JKTR, v.3 of
Oberwolfach Proceedings | Journal of Knot Theory Ram., Oberwolfach Proceedings 3 (2010), pp.
1-19 | null | null | math.GT math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define a new combinatorial complex computing the hat version of link Floer
homology over Z/2Z, which turns out to be significantly smaller than the
Manolescu-Ozsvath-Sarkar one.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:27:10 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2007 09:58:45 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Dec 2007 13:31:01 GMT"
},
{
"version": "v4",
"created": "Fri, 23 Jan 2009 09:18:08 GMT"
},
{
"version": "v5",
"created": "Thu, 14 Jan 2010 10:05:46 GMT"
}
] | 2014-04-14T00:00:00 | [
[
"Beliakova",
"Anna",
""
]
] |
0705.0670 | Silvio Capobianco | Silvio Capobianco | Surjunctivity for cellular automata in Besicovitch spaces | 9 pages, no figures, LaTeX. Shortened, some definition changed, proof
of main lemma changed accordingly. Almost as submitted to Journal of Cellular
Automata for special issue dedicated to Automata 2007 conference proceedings.
Exceptions: one major error corrected in definition of surjunctivity; adapted
for use of the article document class | null | null | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Besicovitch pseudodistance measures the relative size of the set of
points where two functions take different values; the quotient space modulo the
induced equivalence relation is endowed with a natural metric. We study the
behavior of cellular automata in the new topology and show that, under suitable
additional hypotheses, they retain certain properties possessed in the usual
product topology; in particular, that injectivity still implies surjectivity.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:59:14 GMT"
},
{
"version": "v2",
"created": "Sun, 6 May 2007 17:49:01 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Jun 2008 18:09:08 GMT"
}
] | 2008-06-16T00:00:00 | [
[
"Capobianco",
"Silvio",
""
]
] |
0705.0671 | Javier von Stecher | J. von Stecher, C. H. Greene, D. Blume | BEC-BCS Crossover of a Trapped Two-Component Fermi Gas with Unequal
Masses | 11 pages, 6 figures, extended version | null | 10.1103/PhysRevA.76.053613 | null | cond-mat.other | null | We determine the energetically lowest lying states in the BEC-BCS crossover
regime of s-wave interacting two-component Fermi gases under harmonic
confinement by solving the many-body Schrodinger equation using two distinct
approaches. Essentially exact basis set expansion techniques are applied to
determine the energy spectrum of systems with N=4 fermions. Fixed-node
diffusion Monte Carlo methods are applied to systems with up to N=20 fermions,
and a discussion of different guiding functions used in the Monte Carlo
approach to impose the proper symmetry of the fermionic system is presented.
The energies are calculated as a function of the s-wave scattering length a_s
for N=2-20 fermions and different mass ratios \kappa of the two species. On the
BEC and BCS sides, our energies agree with analytically-determined first-order
correction terms. We extract the scattering length and the effective range of
the dimer-dimer system up to \kappa = 20. Our energies for the
strongly-interacting trapped system in the unitarity regime show no shell
structure, and are well described by a simple expression, whose functional form
can be derived using the local density approximation, with one or two
parameters. The universal parameter \xi for the trapped system for various
\kappa is determined, and comparisons with results for the homogeneous system
are presented.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 19:22:35 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 15:38:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"von Stecher",
"J.",
""
],
[
"Greene",
"C. H.",
""
],
[
"Blume",
"D.",
""
]
] |
0705.0672 | Salvatore Tudisco | S.Priviteraa, S.Tudisco, L.Lanzano, F.Musumeci, A.Pluchino,
A.Scordino, A.Campisi, L.Cosentino, P.Finocchiaro, G.Condorelli, M.Mazzillo,
S.Lombardo, E.Sciacca | Towards a new concept of photomultiplier based on silicon technology | 23 pages, 15 figures, 2 tables | null | null | null | physics.ins-det | null | In order to build a new concept of photomultiplier based on silicon
technology, design and characterization of 5x5 arrays of a new generation of
single photon avalanche diodes (SPAD) manufactured by ST-Microelectronics have
been performed. Single photons sensitivity, dark noise and timing resolution of
the SPAD- STM devices in several experimental conditions have been evaluated.
Moreover, the effects arising from the multiple integration of many elements
and the study of their common read-out have been deeply investigated.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:35:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Priviteraa",
"S.",
""
],
[
"Tudisco",
"S.",
""
],
[
"Lanzano",
"L.",
""
],
[
"Musumeci",
"F.",
""
],
[
"Pluchino",
"A.",
""
],
[
"Scordino",
"A.",
""
],
[
"Campisi",
"A.",
""
],
[
"Cosentino",
"L.",
""
],
[
"Finocchiaro",
"P.",
""
],
[
"Condorelli",
"G.",
""
],
[
"Mazzillo",
"M.",
""
],
[
"Lombardo",
"S.",
""
],
[
"Sciacca",
"E.",
""
]
] |
0705.0673 | Rudnei O. Ramos | Jean-Loic Kneur, Marcus Benghi Pinto, Rudnei O. Ramos and Ederson
Staudt | Updating the Phase Diagram of the Gross-Neveu Model in 2+1 Dimensions | 7 pages, 2 eps figures. Replaced with the version that matches the
published one (PLB) | Phys.Lett.B657:136-142,2007 | 10.1016/j.physletb.2007.10.013 | null | hep-ph cond-mat.soft hep-th | null | The method of optimized perturbation theory (OPT) is used to study the phase
diagram of the massless Gross-Neveu model in 2+1 dimensions. In the temperature
and chemical potential plane, our results give strong support to the existence
of a tricritical point and line of first order phase transition, previously
only suspected to exist from extensive lattice Monte Carlo simulations. In
addition of presenting these results we discuss how the OPT can be implemented
in conjunction with the Landau expansion in order to determine all the relevant
critical quantities.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:01:36 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 15:55:15 GMT"
},
{
"version": "v3",
"created": "Thu, 15 Nov 2007 18:19:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kneur",
"Jean-Loic",
""
],
[
"Pinto",
"Marcus Benghi",
""
],
[
"Ramos",
"Rudnei O.",
""
],
[
"Staudt",
"Ederson",
""
]
] |
0705.0674 | Simone Speziale | Etera R. Livine and Simone Speziale | A new spinfoam vertex for quantum gravity | 17+8 pages, 6 figures. v2 updated references | Phys.Rev.D76:084028,2007 | 10.1103/PhysRevD.76.084028 | pi-qg-45 | gr-qc hep-th | null | We introduce a new spinfoam vertex to be used in models of 4d quantum gravity
based on SU(2) and SO(4) BF theory plus constraints. It can be seen as the
conventional vertex of SU(2) BF theory, the 15j symbol, in a particular basis
constructed using SU(2) coherent states. This basis makes the geometric
interpretation of the variables transparent: they are the vectors normal to the
triangles within each tetrahedron. We study the condition under which these
states can be considered semiclassical, and we show that the semiclassical ones
dominate the evaluation of quantum correlations. Finally, we describe how the
constraints reducing BF to gravity can be directly written in terms of the new
variables, and how the semiclassicality of the states might improve
understanding the correct way to implement the constraints.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:45:38 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Aug 2007 15:36:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Livine",
"Etera R.",
""
],
[
"Speziale",
"Simone",
""
]
] |
0705.0675 | Markus Holzner Mr | M. Holzner, A. Liberzon, N. Nikitin, W. Kinzelbach, A. Tsinober | Small scale aspects of flows in proximity of the turbulent/non-turbulent
interface | 4 pages, 4 figures, Phys. Fluids | null | 10.1063/1.2746037 | null | physics.flu-dyn | null | The work reported below is a first of its kind study of the properties of
turbulent flow without strong mean shear in a Newtonian fluid in proximity of
the turbulent/non-turbulent interface, with emphasis on the small scale
aspects. The main tools used are a three-dimensional particle tracking system
(3D-PTV) allowing to measure and follow in a Lagrangian manner the field of
velocity derivatives and direct numerical simulations (DNS). The comparison of
flow properties in the turbulent (A), intermediate (B) and non-turbulent (C)
regions in the proximity of the interface allows for direct observation of the
key physical processes underlying the entrainment phenomenon. The differences
between small scale strain and enstrophy are striking and point to the definite
scenario of turbulent entrainment via the viscous forces originating in strain.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:46:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Holzner",
"M.",
""
],
[
"Liberzon",
"A.",
""
],
[
"Nikitin",
"N.",
""
],
[
"Kinzelbach",
"W.",
""
],
[
"Tsinober",
"A.",
""
]
] |
0705.0676 | Rudnei O. Ramos | Jean-Loic Kneur, Marcus Benghi Pinto, Rudnei O. Ramos and Ederson
Staudt | Emergence of Tricritical Point and Liquid-Gas Phase in the Massless 2+1
Dimensional Gross-Neveu Model | 26 pages, 15 eps figures. Replaced with version that matches the
published one | Phys.Rev.D76:045020,2007 | 10.1103/PhysRevD.76.045020 | null | hep-th cond-mat.soft hep-ph | null | A complete thermodynamical analysis of the 2+1 dimensional massless
Gross-Neveu model is performed using the optimized perturbation theory. This is
a non-perturbative method that allows us to go beyond the known large-N results
already at lowest order. Our results, for a finite number of fermion species,
N, show the existence of a tricritical point in the temperature and chemical
potential phase diagram for discrete chiral phase transition allowing us to
precisely to locate it. By studying the phase diagram in the pressure and
inverse density plane, we also show the existence of a liquid-gas phase, which,
so far, was unknown to exist in this model. Finally, we also derive N dependent
analytical expressions for the fermionic mass, critical temperature and
critical chemical potential.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:53:24 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 18:07:11 GMT"
},
{
"version": "v3",
"created": "Thu, 15 Nov 2007 18:13:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kneur",
"Jean-Loic",
""
],
[
"Pinto",
"Marcus Benghi",
""
],
[
"Ramos",
"Rudnei O.",
""
],
[
"Staudt",
"Ederson",
""
]
] |
0705.0677 | Dan A. Lee | Dan A. Lee | On the near-equality case of the Positive Mass Theorem | 14 pages | null | null | null | math.DG | null | The Positive Mass Conjecture states that any complete asymptotically flat
manifold of nonnnegative scalar curvature has nonnegative mass. Moreover, the
equality case of the Positive Mass Conjecture states that in the above
situation, if the mass is zero, then the Riemannian manifold must be Euclidean
space. The Positive Mass Conjecture was proved by R. Schoen and S.-T. Yau for
all manifolds of dimension less than 8, and it was proved by E. Witten for all
spin manifolds. In this paper, we consider complete asymptotically flat
manifolds of nonnegative scalar curvature that are also harmonically flat in an
end. We show that, whenever the Positive Mass Theorem holds, any appropriately
normalized sequence of such manifolds whose masses converge to zero must have
metrics that are uniformly converging to Euclidean metrics outside a compact
region. This result is an ingredient in a forthcoming proof, co-authored with
H. Bray, of the Riemannian Penrose inequality in dimensions less than 8.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:55:49 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lee",
"Dan A.",
""
]
] |
0705.0678 | Wolfgang Trautmann | W. Trautmann and the ALADIN Collaboration | Bimodality in spectator fragmentation | 10 pages, 7 figures, to appear in Proceedings of the XLVth
International Winter Meeting on Nuclear Physics}, Bormio, Italy, January 2007
(one reference added after submission) | null | null | null | nucl-ex | null | The fluctuations of the largest fragment charge of a partition and of the
charge asymmetries of the two or three largest fragments in spectator decays
following 197Au + 197Au collisions at 1000 MeV per nucleon are investigated.
The observed bimodal distributions at specific values of the sorting variable
Z_bound exhibit features known from percolation theory where they appear as
finite-size effects. The underlying configurational fluctuations seem generic
for fragmentation processes in small systems.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 16:59:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Trautmann",
"W.",
""
],
[
"Collaboration",
"the ALADIN",
""
]
] |
0705.0679 | Zeynep Nilhan Gurkan | Zeynep Nilhan Gurkan and Oktay K. Pashaev | Two Qubit Entanglement in $XYZ$ Magnetic Chain with DM Antisymmetric
Anisotropic Exchange Interaction | 11 pages, 6 figures | null | null | null | quant-ph | null | In the present paper we study two qubit entanglement in the most general
$XYZ$ Heisenberg magnetic chain with (non)homogeneous magnetic fields and the
DM anisotropic antisymmetric exchange interaction, arising from the spin-orbit
coupling . The model includes all known results as particular cases, for both
antiferromagnetic and ferromagnetic $XX, XY, XXX, XXZ, XYZ$ chains. The
concurrence of two qubit thermal entanglement and its dependence on anisotropic
parameters, external magnetic field and temperature are studied in details. We
found that in all cases, inclusion of the DM interaction, which is responsible
for weak ferromagnetism in mainly antiferromagnetic crystals and spin
arrangement in low symmetry magnets, creates (when it does not exist) or
strengthens (when it exists) entanglement in $XYZ$ spin chain. This implies
existence of a relation between arrangement of spins and entanglement, in which
the DM coupling plays an essential role. It suggests also that anisotropic
antisymmetric exchange interaction could be an efficient control parameter of
entanglement in the general $XYZ$ case.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:16:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gurkan",
"Zeynep Nilhan",
""
],
[
"Pashaev",
"Oktay K.",
""
]
] |
0705.0680 | Giorgio Calucci | Giorgio Calucci and Antonino Di Piazza | Production of light particles by very strong and slowly varying magnetic
fields | 3 pages ISMD (2006) Conference - Paraty, R.J. Brazil | Braz.J.Phys.37:751-756,2007 | null | null | hep-ph | null | The possibility that around some astrophysical objects there are non-static
magnetic fields of enormous intensity suggests that in these situations real
particles may be produced. The slowness of the variation is compensated by the
huge intensity. The main issue is the production of e+,e- pairs annihilating
into photons and the direct production of photons, as one of the concurrent
process in the GRB (gamma ray bursts). Then some simple effects due to the
presence of the intense gravity are studied and finally a look is given to the
production of other kinds of particles.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:18:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Calucci",
"Giorgio",
""
],
[
"Di Piazza",
"Antonino",
""
]
] |
0705.0681 | Samina S. Masood | Samina S. Masood and Allen Miller | Entanglement in a Jaynes-Cummings Model with Two Atoms and Two Photon
Modes | 11 pages and 1 figure | Univ. J. Phys.Appl. 2(5): 237-244, 2014 | 10.13189/ujpa1.2014.020501 | null | quant-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the conditions of entanglement for a system of two atoms and
two photon modes in vacuum, using the Jaynes-Cummings model in the
rotating-wave approximation. It is found, by generalizing the existing results,
that the strength of entanglement is a periodic function of time. We explicitly
show that our results are in agreement with the existing results of
entanglement conditions under appropriate limits. Results for the two-atom and
two-photon system are generalized to the case of arbitrary values for the
atomic energies, corresponding to photon modes frequencies. Though it is
apparently a generalization of the existing work, we have considered for the
first time both the resonant and nonresonant conditions and found a general
equation which could be true for both cases. Moreover, we show that periodicity
of the entanglement is a distinct feature of resonant system. Considering the
two atoms and two photons system, in detail, we setup an approach which could
be generalized for many particle systems and the resulting master equation can
also be analyzed.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:26:34 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Apr 2015 02:19:11 GMT"
}
] | 2016-06-27T00:00:00 | [
[
"Masood",
"Samina S.",
""
],
[
"Miller",
"Allen",
""
]
] |
0705.0682 | Edward A. Baltz | Edward A. Baltz, Phil Marshall, Masamune Oguri | Analytic models of plausible gravitational lens potentials | 24 pages, 10 figures, matches published version | JCAP 0901:015,2009 | 10.1088/1475-7516/2009/01/015 | SLAC-PUB-12497 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational lenses on galaxy scales are plausibly modelled as having
ellipsoidal symmetry and a universal dark matter density profile, with a Sersic
profile to describe the distribution of baryonic matter. Predicting all lensing
effects requires knowledge of the total lens potential: in this work we give
analytic forms for that of the above hybrid model. Emphasising that complex
lens potentials can be constructed from simpler components in linear
combination, we provide a recipe for attaining elliptical symmetry in either
projected mass or lens potential. We also provide analytic formulae for the
lens potentials of Sersic profiles for integer and half-integer index. We then
present formulae describing the gravitational lensing effects due to
smoothly-truncated universal density profiles in cold dark matter model. For
our isolated haloes the density profile falls off as radius to the minus fifth
or seventh power beyond the tidal radius, functional forms that allow all
orders of lens potential derivatives to be calculated analytically, while
ensuring a non-divergent total mass. We show how the observables predicted by
this profile differ from that of the original infinite-mass NFW profile.
Expressions for the gravitational flexion are highlighted. We show how
decreasing the tidal radius allows stripped haloes to be modelled, providing a
framework for a fuller investigation of dark matter substructure in galaxies
and clusters. Finally we remark on the need for finite mass halo profiles when
doing cosmological ray-tracing simulations, and the need for readily-calculable
higher order derivatives of the lens potential when studying catastrophes in
strong lenses.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:26:43 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 16:32:14 GMT"
},
{
"version": "v3",
"created": "Thu, 11 Dec 2008 07:11:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Baltz",
"Edward A.",
""
],
[
"Marshall",
"Phil",
""
],
[
"Oguri",
"Masamune",
""
]
] |
0705.0683 | Giorgio Calucci | Giorgio Calucci and Enrico Cattaruzza | Screening in the QCD plasma: effects of the gluons and of the
confinement | 3 pages Conference ISMD (2006) PARATY R.J. Brazil | null | null | null | hep-ph | null | The effects of a thermalized gas of gluons in a q,q bar plasma is
investigated. Then the interplay between Debye screening and confinement is
analyzed in a simplified model. While the one-gluon exchange gives results very
similar, but not equal, to the electric case, the phenomenological introduction
of confinement leads to very different results.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:27:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Calucci",
"Giorgio",
""
],
[
"Cattaruzza",
"Enrico",
""
]
] |
0705.0684 | Chwen-Yang Shew | Chwen-Yang Shew, Yuji Higuchi and Kenichi Yoshikawa | Elucidation of Conformational Hysteresis on a Giant DNA | 21 pages, 7 figures | null | 10.1063/1.2759925 | null | cond-mat.soft | null | The conformational behavior of a giant DNA mediated by condensing agents in
the bulk solution has been investigated through experimental and theoretical
approaches. Experimentally, a pronounced conformational hysteresis is observed
for folding and unfolding processes, by increasing and decreasing the
concentration of condensing agent PEG (Polyethylene glycol), respectively. To
elucidate the observed hysteresis, a semiflexible chain model is studied by
using Monte Carlo simulations for the coil-globule transition. In the
simulations, the hysteresis loop emerges for stiff enough chains, indicating
distinct pathways for folding and unfolding processes. Also, our results show
that globular state is thermodynamically more stable than coiled state in the
hysteresis loop. Our findings suggest that increasing chain stiffness may
reduce the chain conformations relevant to the folding pathway, which impedes
the folding process.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:28:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shew",
"Chwen-Yang",
""
],
[
"Higuchi",
"Yuji",
""
],
[
"Yoshikawa",
"Kenichi",
""
]
] |
0705.0685 | Dunc Lorimer | D.R. Lorimer, M.A. McLaughlin, D.J. Champion and I.H. Stairs | PSR J1453+1902 and the radio luminosities of solitary versus binary
millisecond pulsars | 8 pages, 5 figures and 3 tables, accepted for publication by MNRAS | Mon.Not.Roy.Astron.Soc.379:282-288,2007 | 10.1111/j.1365-2966.2007.11946.x | null | astro-ph | null | We present 3 yr of timing observations for PSR J1453+1902, a 5.79-ms pulsar
discovered during a 430-MHz drift-scan survey with the Arecibo telescope. Our
observations show that PSR J1453+1902 is solitary and has a proper motion of
8(2) mas/yr. At the nominal distance of 1.2 kpc estimated from the pulsar's
dispersion measure, this corresponds to a transverse speed of 46(11) km/s,
typical of the millisecond pulsar population. We analyse the current sample of
55 millisecond pulsars in the Galactic disk and revisit the question of whether
the luminosities of isolated millisecond pulsars are different from their
binary counterparts. We demonstrate that the apparent differences in the
luminosity distributions seen in samples selected from 430-MHz surveys can be
explained by small-number statistics and observational selection biases. An
examination of the sample from 1400-MHz surveys shows no differences in the
distributions. The simplest conclusion from the current data is that the spin,
kinematic, spatial and luminosity distributions of isolated and binary
millisecond pulsars are consistent with a single homogeneous population.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:41:24 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lorimer",
"D. R.",
""
],
[
"McLaughlin",
"M. A.",
""
],
[
"Champion",
"D. J.",
""
],
[
"Stairs",
"I. H.",
""
]
] |
0705.0686 | Richard Hollis | R. S. Hollis (for the STAR Collaboration) | Identified particle measurements at large transverse momenta from p+p to
Au+Au collisions at RHIC | 6 pages, 4 figures, proceedings for the Lake Louise Winter Institute
2007, 19th-24th February 2007, Alberta, Canada | null | 10.1142/9789812776105_0025 | null | nucl-ex | null | Measurements of various particle species over an extended momentum range
provide a sensitive experimental tool for investigating particle production
mechanisms in hadronic collisions. Comparison of the spectral shapes from
different collision centralities measured with the STAR detector at RHIC allows
one to study the interplay of soft and hard particle production for mesons and
investigate various baryon-meson effects. Systematic studies of identified
particle spectra for various colliding systems and different incident energies
provide additional insights toward the interplay between fragmentation and
non-fragmentation contributions to the particle production. In these
proceedings we present a systematic study of transverse momentum spectra for
charged pions, protons and antiprotons from Au+Au and Cu+Cu data at
sqrt(s_NN)=200 and 62.4 GeV as a function of collision centrality. We compare
those measurements with p+p and d+Au data, investigating the system effects on
energy loss.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:41:37 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Hollis",
"R. S.",
"",
"for the STAR Collaboration"
]
] |
0705.0687 | Haisheng Li Dr. | Haisheng Li | Modules-at-infinity for quantum vertex algebras | Latex, 48 pages | null | 10.1007/s00220-008-0534-1 | null | math.QA | null | This is a sequel to \cite{li-qva1} and \cite{li-qva2} in a series to study
vertex algebra-like structures arising from various algebras such as quantum
affine algebras and Yangians. In this paper, we study two versions of the
double Yangian $DY_{\hbar}(sl_{2})$, denoted by $DY_{q}(sl_{2})$ and
$DY_{q}^{\infty}(sl_{2})$ with $q$ a nonzero complex number. For each nonzero
complex number $q$, we construct a quantum vertex algebra $V_{q}$ and prove
that every $DY_{q}(sl_{2})$-module is naturally a $V_{q}$-module. We also show
that $DY_{q}^{\infty}(sl_{2})$-modules are what we call
$V_{q}$-modules-at-infinity. To achieve this goal, we study what we call
$\S$-local subsets and quasi-local subsets of $\Hom (W,W((x^{-1})))$ for any
vector space $W$, and we prove that any $\S$-local subset generates a (weak)
quantum vertex algebra and that any quasi-local subset generates a vertex
algebra with $W$ as a (left) quasi module-at-infinity. Using this result we
associate the Lie algebra of pseudo-differential operators on the circle with
vertex algebras in terms of quasi modules-at-infinity.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:46:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Li",
"Haisheng",
""
]
] |
0705.0688 | Giovanni Andrea Prodi | IGEC-2 Collaboration | Results of the IGEC-2 search for gravitational wave bursts during 2005 | 10 pages, to be submitted to Phys. Rev. D | Phys.Rev.D76:102001,2007 | 10.1103/PhysRevD.76.102001 | null | gr-qc | null | The network of resonant bar detectors of gravitational waves resumed
coordinated observations within the International Gravitational Event
Collaboration (IGEC-2). Four detectors are taking part in this collaboration:
ALLEGRO, AURIGA, EXPLORER and NAUTILUS. We present here the results of the
search for gravitational wave bursts over 6 months during 2005, when IGEC-2 was
the only gravitational wave observatory in operation. The network data analysis
implemented is based on a time coincidence search among AURIGA, EXPLORER and
NAUTILUS, keeping the data from ALLEGRO for follow-up studies. With respect to
the previous IGEC 1997-2000 observations, the amplitude sensitivity of the
detectors to bursts improved by a factor about 3 and the sensitivity bandwidths
are wider, so that the data analysis was tuned considering a larger class of
detectable waveforms. Thanks to the higher duty cycles of the single detectors,
we decided to focus the analysis on three-fold observation, so to ensure the
identification of any single candidate of gravitational waves (gw) with high
statistical confidence. The achieved false detection rate is as low as 1 per
century. No candidates were found.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 17:58:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"2 Collaboration",
"",
""
]
] |
0705.0689 | Chuan Hung Chen | Chuan-Hung Chen, Chao-Qiang Geng | Unparticle physics on direct CP violation | 4 pages, 3 figures, paper revised, references added, new T-odd
observables are introduced, published version | Phys.Rev.D76:115003,2007 | 10.1103/PhysRevD.76.115003 | null | hep-ph hep-ex | null | The effects of the peculiar CP conserving phases in unparticle propagators
are explored. We find that the phases have a great impact on CP-violation. We
adopt the decays $B_{d}\to \pi^{+} \pi^{-}$ and $B_{d}\to \ell^{-}\ell^{+}$ as
the illustrators to demonstrate the influences of these phases on the direct CP
asymmetries. In particular, we emphasize that unparticle physics is the only
model suggested to date that could give the direct CP asymmetries in $B_d\to
\ell^{-} \ell^{+}$ as large as 15%. We also point out that the unparticle
phases could be probed in $B\to K^* \ell^{+} \ell^{-}$ decays by using T-odd
correlations.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 18:32:05 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Jul 2007 16:43:53 GMT"
},
{
"version": "v3",
"created": "Wed, 28 Nov 2007 12:30:16 GMT"
},
{
"version": "v4",
"created": "Thu, 29 Nov 2007 14:38:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Geng",
"Chao-Qiang",
""
]
] |
0705.0690 | Anatoly Kolomeisky | Maxim N. Artyomov, Alexander Yu. Morozov, Ekaterina Pronina, and
Anatoly B. Kolomeisky | Dynamic Properties of Molecular Motors in Burnt-Bridge Models | 14 pages. Submitted to J. Stat. Mech | null | 10.1088/1742-5468/2007/08/P08002 | null | cond-mat.soft cond-mat.stat-mech | null | Dynamic properties of molecular motors that fuel their motion by actively
interacting with underlying molecular tracks are studied theoretically via
discrete-state stochastic ``burnt-bridge'' models. The transport of the
particles is viewed as an effective diffusion along one-dimensional lattices
with periodically distributed weak links. When an unbiased random walker passes
the weak link it can be destroyed (``burned'') with probability p, providing a
bias in the motion of the molecular motor. A new theoretical approach that
allows one to calculate exactly all dynamic properties of motor proteins, such
as velocity and dispersion, at general conditions is presented. It is found
that dispersion is a decreasing function of the concentration of bridges, while
the dependence of dispersion on the burning probability is more complex. Our
calculations also show a gap in dispersion for very low concentrations of weak
links which indicates a dynamic phase transition between unbiased and biased
diffusion regimes. Theoretical findings are supported by Monte Carlo computer
simulations.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 18:30:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Artyomov",
"Maxim N.",
""
],
[
"Morozov",
"Alexander Yu.",
""
],
[
"Pronina",
"Ekaterina",
""
],
[
"Kolomeisky",
"Anatoly B.",
""
]
] |
0705.0691 | Aneta Iordanova | A. Iordanova, O. Barannikova, R. S. Hollis (for the STAR
Collaboration) | System size dependence of freeze-out properties at RHIC | 6 pages, 6 figures, poster proceedings for the Quark Matter 2006
Conference, Shanghai, China, 14th-20th Novermber 2006, submitted to the
International Journal of Modern Physics E | Int.J.Mod.Phys.E16:1800-1805,2007 | 10.1142/S0218301307007027 | null | nucl-ex | null | The STAR experiment at RHIC has measured identified pi(+/-), K(+/-) and
p(pbar) spectra and ratios from sqrt(s_NN) = 62.4 and 200 GeV Cu+Cu collisions.
The new Cu+Cu results are studied with hydro-motivated blast-wave and
statistical model frameworks in order to characterize the freeze-out properties
of this system. Along with measurements from Au+Au and p+p collisions, the
obtained freeze-out parameters are discussed as a function of collision energy,
system size, centrality and inferred energy density. This multi-dimensional
systematic study reveals the importance of the collision geometry and furthers
our understanding of the QCD phases.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 18:35:07 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Iordanova",
"A.",
"",
"for the STAR\n Collaboration"
],
[
"Barannikova",
"O.",
"",
"for the STAR\n Collaboration"
],
[
"Hollis",
"R. S.",
"",
"for the STAR\n Collaboration"
]
] |
0705.0692 | Kwei-Chou Yang | Kwei-Chou Yang | Light-Cone Distribution Amplitudes of Axial-vector Mesons | 77 pages. Typos corrected | Nucl.Phys.B776:187-257,2007 | 10.1016/j.nuclphysb.2007.03.046 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have presented a detailed study of twist-2 and twist-3 light-cone
distribution amplitudes of $1^3P_1$ and $1^1P_1$ axial-vector mesons, based on
QCD conformal partial wave expansion. Applying equations of motion, the
twist-three two-parton light-cone distribution amplitudes can be expressed in
terms of leading-twist and twist-three three-parton light-cone distribution
amplitudes. The relevant G-parity invariant and violating parameters,
containing the corrections due to the SU(3) breaking effects, are evaluated
from the QCD sum rule method. The results for axial-vector decay constants of
$1^3P_1$ states are presented. The values of tensor decay constants and
Gegenbauer moments of the leading twist distribution amplitudes for $1^1P_1$
states are updated. Using Gell-Mann-Okubo mass formula, the mixing angle for
the $f_8$ and $f_1$ of $1^3P_1$ states is $\theta_{^3P_1}\sim 38^\circ$, and
that for $h_8$ and $h_1$ of $1^1P_1$ states is $\theta_{^1P_1}\sim 10^\circ$.
The detailed properties for physical states $f_1(1285), f_1(1420), h_1(1170)$,
and $h_1(1380)$ are given. Assuming the mixing angle between $K_{1A}$ and
$K_{1B}$ to be $\theta_K=45^\circ$ or $-45^\circ$, we also give the detailed
study for $K_1(1270)$ and $K_1(1400)$. Using the conformal partial wave
expansion, we obtain the models for light-cone distribution amplitudes,
containing contributions up to conformal spin 9/2. It is interesting to note
that some distribution amplitudes have significant asymmetric behaviors, which
should be phenomenologically attractive.
| [
{
"version": "v1",
"created": "Sat, 5 May 2007 00:32:26 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 12:04:34 GMT"
},
{
"version": "v3",
"created": "Thu, 7 Oct 2010 03:42:48 GMT"
}
] | 2010-10-08T00:00:00 | [
[
"Yang",
"Kwei-Chou",
""
]
] |
0705.0693 | Tshilidzi Marwala | Evan Hurwitz and Tshilidzi Marwala | Learning to Bluff | 6 pages | null | null | null | cs.AI | null | The act of bluffing confounds game designers to this day. The very nature of
bluffing is even open for debate, adding further complication to the process of
creating intelligent virtual players that can bluff, and hence play,
realistically. Through the use of intelligent, learning agents, and carefully
designed agent outlooks, an agent can in fact learn to predict its opponents
reactions based not only on its own cards, but on the actions of those around
it. With this wider scope of understanding, an agent can in learn to bluff its
opponents, with the action representing not an illogical action, as bluffing is
often viewed, but rather as an act of maximising returns through an effective
statistical optimisation. By using a tee dee lambda learning algorithm to
continuously adapt neural network agent intelligence, agents have been shown to
be able to learn to bluff without outside prompting, and even to learn to call
each others bluffs in free, competitive play.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 19:15:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hurwitz",
"Evan",
""
],
[
"Marwala",
"Tshilidzi",
""
]
] |
0705.0694 | Hui Ma | Hui Ma and Yoshihiro Ohnita | On Lagrangian submanifolds in complex hyperquadrics and isoparametric
hypersurfaces in spheres | 38 pages, v2, minor corrections made | null | null | null | math.DG math.SG | null | The $n$-dimensional complex hyperquadric is a compact complex algebraic
hypersurface defined by the quadratic equation in the $(n+1)$-dimensional
complex projective space, which is isometric to the real Grassmann manifold of
oriented 2- planes and is a compact Hermitian symmetric space of rank 2. In
this paper we study geometry of compact Lagrangian submanifolds in complex
hyperquadrics from the viewpoint of the theory of isoparametric hypersurfaces
in spheres. From this viewpoint we provide a classification theorem of compact
homogeneous Lagrangian submanifolds in complex hyperquadrics by using the
moment map technique. Moreover we determine the Hamiltonian stability of
compact minimal Lagrangian submanifolds embedded in complex hyperquadrics which
are obtained as Gauss images of isoparametric hypersurfaces in spheres with
$g(=1,2,3)$ distinct principal curvatures.
| [
{
"version": "v1",
"created": "Sat, 5 May 2007 01:30:10 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 00:11:19 GMT"
}
] | 2007-08-17T00:00:00 | [
[
"Ma",
"Hui",
""
],
[
"Ohnita",
"Yoshihiro",
""
]
] |
0705.0695 | Matthew Shaw | J.F. Schneiderman, M.D. Shaw, B. Palmer, P. Delsing, and P.M.
Echternach | Quasiparticle Poisoning and Quantum Coherence in a Differential Charge
Qubit | 9 pages, 5 figures, two column format | null | null | null | cond-mat.mes-hall cond-mat.supr-con | null | We demonstrate the operation of a differential single Cooper-pair box, a
charge qubit consisting of two aluminum islands, isolated from ground, coupled
by a pair of small-area Josephson junctions, and read out with a
superconducting differential radio-frequency single electron transistor. We
have tested four devices, all of which show evidence of quasiparticle
poisoning. The devices are characterized with microwave spectroscopy and
temperature dependence studies, and Coulomb staircases are shown to be
e-periodic in all samples. However, coherent control is still possible with
non-adiabatic voltage pulses. Coherent oscillation experiments and a relaxation
time measurement were performed using a charge derivative readout technique.
| [
{
"version": "v1",
"created": "Fri, 4 May 2007 22:02:00 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schneiderman",
"J. F.",
""
],
[
"Shaw",
"M. D.",
""
],
[
"Palmer",
"B.",
""
],
[
"Delsing",
"P.",
""
],
[
"Echternach",
"P. M.",
""
]
] |
0705.0696 | Thomas Dent | Thomas Dent, Steffen Stern and Christof Wetterich | Primordial nucleosynthesis as a probe of fundamental physics parameters | v2: 34 pages, 2 figures, typo in last GUT scenario corrected, added
discussion and graph of nonlinear behaviour in GUT scenarios, added short
section discussing binding of dineutron and 8Be, refs added, conclusions
unaltered. Accepted for publication, Phys. Rev. D | Phys.Rev.D76:063513,2007 | 10.1103/PhysRevD.76.063513 | HD-THEP-07-10 | astro-ph gr-qc hep-ph hep-th | null | We analyze the effect of variation of fundamental couplings and mass scales
on primordial nucleosynthesis in a systematic way. The first step establishes
the response of primordial element abundances to the variation of a large
number of nuclear physics parameters, including nuclear binding energies. We
find a strong influence of the n-p mass difference (for the 4He abundance), of
the nucleon mass (for deuterium) and of A=3,4,7 binding energies (for 3He, 6Li
and 7Li). A second step relates the nuclear parameters to the parameters of the
Standard Model of particle physics. The deuterium, and, above all, 7Li
abundances depend strongly on the average light quark mass hat{m} \equiv
(m_u+m_d)/2. We calculate the behaviour of abundances when variations of
fundamental parameters obey relations arising from grand unification. We also
discuss the possibility of a substantial shift in the lithium abundance while
the deuterium and 4He abundances are only weakly affected.
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 10:34:04 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 13:21:37 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Dent",
"Thomas",
""
],
[
"Stern",
"Steffen",
""
],
[
"Wetterich",
"Christof",
""
]
] |
0705.0697 | Richard Hill | Christopher T. Hill and Richard J. Hill (Fermilab) | T-Parity Violation by Anomalies | 17 pages | Phys.Rev.D76:115014,2007 | 10.1103/PhysRevD.76.115014 | FERMILAB-PUB-07/096-T | hep-ph astro-ph hep-th | null | Little Higgs theories often rely on an internal parity ("T-parity'') to
suppress non-standard electroweak effects or to provide a dark matter
candidate. We show that such a symmetry is generally broken by anomalies, as
described by the Wess-Zumino-Witten term. We study a simple SU(3) x SU(3)/SU(3)
Little Higgs scheme where we obtain a minimal form for the topological
interactions of a single Higgs field. The results apply to more general models,
including [SU(3) x SU(3)/SU(3)]^4, SU(5)/SO(5), and SU(6)/Sp(6).
| [
{
"version": "v1",
"created": "Mon, 7 May 2007 04:51:25 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"Hill",
"Christopher T.",
"",
"Fermilab"
],
[
"Hill",
"Richard J.",
"",
"Fermilab"
]
] |
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