We show that for a monic polynomial p of degree d, the length of the level
set {z: |p(z)|=1} is at most 9.2 d, which improves an earlier estimate due to
P. Borwein. For d=2 we show that the extremal level set is the Bernoullis'
Lemniscate. ...
Strings in five-dimensional anti-de Sitter space with a symmetry
April 1, 2008
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Physics
General Relativity and Quantum Cosmology
The equation of motion of an extended object in spacetime reduces to an
ordinary differential equation in the presence of symmetry. By properly
defining of the symmetry with notion of cohomogeneity, we discuss the method
for classifying all...
Large deviations principles of Non-Freidlin-Wentzell type
March 13, 2008
Physics
Mathematics
Mathematical Physics
Mathematical Physics
Generalized Large deviation principles was developed for Colombeau-Ito SDE
with a random coefficients. We is significantly expand the classical theory of
large deviations for randomly perturbed dynamical systems developed by Freidlin
and We...
A Universal In-Place Reconfiguration Algorithm for Sliding Cube-Shaped
Robots in a Quadratic Number of Moves
February 22, 2008
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Computer Science
Computational Geometry
Multiagent Systems
Robotics
In the modular robot reconfiguration problem, we are given n cube-shaped
modules (or robots) as well as two configurations, i.e., placements of the n
modules so that their union is face-connected. The goal is to find a sequence
of moves...
n-Groupoids and Stacky Groupoids
January 14, 2008
Mathematics
Differential Geometry
Category Theory
We discuss two generalizations of Lie groupoids. One consists of Lie
n-groupoids defined as simplicial manifolds with trivial πk≥n+1.
The other consists of stacky Lie groupoids \cG\rra M with \cG a
differentiable stack. We ...
Data Tables for Lorentz and CPT Violation
January 1, 2008
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Physics
High Energy Physics - Phenomenology
General Relativity and Quantum Cosmology
High Energy Physics - Experiment
High Energy Physics - Theory
High Energy Physics - Phenomenology
General Relativity and Quantum Cosmology
High Energy Physics - Experiment
High Energy Physics - Theory
This work tabulates measured and derived values of coefficients for Lorentz
and CPT violation in the Standard-Model Extension. Summary tables are extracted
listing maximal attained sensitivities in the matter, photon, neutrino, and
gravity ...
Radiatively induced finite and (un)determined Chern-Simons-like terms
November 26, 2007
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Physics
High Energy Physics - Theory
The problem of Chern-Simons-like term induction via quantum corrections in
four-dimensions is investigated in two different cases. In the first case, we
consider two distinct approaches to deal with the exact fermion propagator of
the exten...
The nature of light in an expanding universe
October 25, 2007
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Physics
General Physics
In this paper, we prove the existence of two degrees of freedom that govern
the movement of light in an expanding universe. The use of the fractal manifold
model leads to reciprocal causality between variation of geometry and gravity,
which...
A recursive linear time modular decomposition algorithm via LexBFS
October 20, 2007
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Computer Science
Discrete Mathematics
A module of a graph G is a set of vertices that have the same set of
neighbours outside. Modules of a graphs form a so-called partitive family and
thereby can be represented by a unique tree MD(G), called the modular
decomposition tree. Mot...
Bohmian Mechanics at Space-Time Singularities. I. Timelike Singularities
August 1, 2007
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Physics
Quantum Physics
Quantum Physics
We develop an extension of Bohmian mechanics to a curved background
space-time containing a singularity. The present paper focuses on timelike
singularities. We use the naked timelike singularity of the super-critical
Reissner-Nordstrom geo...