122300442
Perturbed superpotentials for coset models
Abstract A class of topological minimal matter corresponding to some of the coset models of Kazama and Suzuki is investigated. Starting from the general principle, the perturbed superpotentials for the corresponding models are explicitly constructed. These perturbed. superpotentials contain all the information about physical amplitudes in the topological theory.
17663649
TACHYON CONDENSATES AND ANISOTROPIC UNIVERSE
We investigate the cosmological solutions in closed bosonic string theory in the presence of nonzero tachyon condensate. We specifically obtain time-dependent solutions which describes an anisotropic universe. We also discuss the nature of such time-dependent solutions when small tachyon fluctuations around the condensate are taken into account.
37426334
Fermion condensates and weak symmetry breaking in a superstring-based model.
We start with the gauge group SU(3)/sub C/ x SU(2)/sub L/ x U(1)/sub R/ x U(1)/sub N/ (equivalentG/sub 3211/), which is a rank-five subgroup of E/sub 6/. We include chiral-fermion-condensate terms in the effective four-dimensional Lagrangian derived from superstrings and discuss how this condensation can be responsible for weak symmetry breaking at a scale of 100 GeV. One experimental effect of the above will be the nonobservation of light Higgs scalars of the Salam-Weinberg model, although the other results of the same remain unchanged.
32901635
Grand unification and supergravity in SO(10).
We extend the supergravity model to SO(10) gauge symmetry. There is a hierarchical structure with intermediate mass scale for SO(10)-symmetry breaking, along with a tree-level weak-symmetry breaking caused by a Polony-type potential in a manner parallel to SU(5)-symmetry breaking.
119401169
De Sitter vacua from N=2 gauged supergravity
Typical de Sitter (dS) vacua of gauged supergravity correspond to saddle points of the potential and often the unstable mode runs into a singularity. We explore the possibility to obtain dS points where the unstable mode goes on both sides into a supersymmetric smooth vacuum. Within N = 2 gauged supergravity coupled to the universal hypermultiplet, we have found a potential which has two supersymmetric minima (one of them can be flat) and these are connected by a de Sitter saddle point. In order to obtain this potential by an abelian gauging, it was important to include the recently proposed quantum corrections to the universal hypermultiplet sector. Our results apply to four as well as five dimensional gauged supergravity theories.
118116271
Directed Random Walks on Colored, Periodic Lattices: A Gauge Theoretic Approach
We define a random walk problem which admits analytic results, on a class of infinite periodic lattices which are directed and colored. Our approach is motivated from the fact that such lattices arise in string theoretic constructs of certain gauge theories. An operator counting problem in the latter is mapped to a problem in random walks. This is illustrated with several examples.