3,434 research outputs found
Observed parity-odd CMB temperature bispectrum
Parity-odd non-Gaussianities create a variety of temperature bispectra in the
cosmic microwave background (CMB), defined in the domain: . These models are yet unconstrained in the literature, that
so far focused exclusively on the more common parity-even scenarios. In this
work, we provide the first experimental constraints on parity-odd bispectrum
signals in WMAP 9-year temperature data, using a separable modal parity-odd
estimator. Comparing theoretical bispectrum templates to the observed
bispectrum, we place constraints on the so-called nonlineality parameters of
parity-odd tensor non-Gaussianities predicted by several Early Universe models.
Our technique also generates a model-independent, smoothed reconstruction of
the bispectrum of the data for parity-odd configurations.Comment: 17 pages, 4 figures, 1 table. Accepted for publication in JCA
Interparticle Potential up to Next-to-leading Order for Gravitational, Electrical, and Dilatonic Forces
Long-range forces up to next-to-leading order are computed in the framework
of the Einstein-Maxwell-dilaton system by means of a semiclassical approach to
gravity. As has been recently shown, this approach is effective if one of the
masses under consideration is significantly greater than all the energies
involved in the system. Further, we obtain the condition for the equilibrium of
charged masses in the system.Comment: 19 pages, 19 figures, RevTeX4.1. Revised version, Title change
Fermion spectrum and localization on kinks in a deconstructed dimension
We study the deconstructed scalar theory having nonlinear interactions and
being renormalizable. It is shown that the kink-like configurations exist in
such models. The possible forms of Yukawa coupling are considered. We find the
degeneracy in mass spectrum of fermions coupled to the nontrivial scalar
configuration.Comment: 19pages, 39figures, revised versio
Statistical Mechanics of Charged Particles in Einstein-Maxwell-Scalar Theory
We consider an -body system of charged particle coupled to gravitational,
electromagnetic, and scalar fields. The metric on moduli space for the system
can be considered if a relation among the charges and mass is satisfied, which
includes the BPS relation for monopoles and the extreme condition for charged
black holes. Using the metric on moduli space in the long distance
approximation, we study the statistical mechanics of the charged particles at
low velocities. The partition function is evaluated as the leading order of the
large expansion, where is the spatial dimension of the system and will
be substituted finally as .Comment: 11 pages, RevTeX3.
Conformal Quantum Mechanics in Two Black Hole Moduli Space
We discuss quantum mechanics in the moduli space consisting of two maximally
charged dilaton black holes. The quantum mechanics of the two black hole system
is similar to the one of DFF model, and this system has the conformal
symmetry. Also, we discuss the bound states in this system.Comment: 15 pages, RevTeX3.0. References added, Minor correction
Gravitational Effects of Quantum Fields in the Interior of a Cylindrical Black Hole
The gravitational back-reaction is calculated for the conformally invariant
scalar field within a black cosmic string interior with cosmological constant.
Using the perturbed metric, the gravitational effects of the quantum field are
calculated. It is found that the perturbations initially strengthen the
singularity. This effect is similar to the case of spherical symmetry (without
cosmological constant). This indicates that the behaviour of quantum effects
may be universal and not dependent on the geometry of the spacetime nor the
presence of a non-zero cosmological constant.Comment: 13 pages, 1 figure, uses AMS package. D.E. solution corrected. Some
qualitative results are change
Free field constructions for the elliptic algebra and Baxter's eight-vertex model
Three examples of free field constructions for the vertex operators of the
elliptic quantum group are obtained. Two of these
(for ) are based on representation theories
of the deformed Virasoro algebra, which correspond to the level 4 and level 2
-algebra of Lepowsky and Wilson. The third one () is
constructed over a tensor product of a bosonic and a fermionic Fock spaces. The
algebraic structure at , however, is not related to the deformed
Virasoro algebra. Using these free field constructions, an integral formula for
the correlation functions of Baxter's eight-vertex model is obtained. This
formula shows different structure compared with the one obtained by Lashkevich
and Pugai.Comment: 23 pages. Based on talks given at "MATHPHYS ODYSSEY 2001-Integrable
Models and Beyond" at Okayama and Kyoto, February 19-23, 2001, et
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