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18 papers · 2 filters
Black Hole Geometry around an Elementary BPS String State
Gautam Mandal, Spenta R. Wadia
We probe the geometry around an elementary BPS (EBPS) state in heterotic string theory compactified on a six-torus by scattering a massless scalar off it and comparing with the cor…
Orbifolds of M-theory
Keshav Dasgupta, Sunil Mukhi
We study Z2-orbifolds of 11-dimensional M-theory on tori of various dimensions. The most interesting model (besides the known S1/Z2 case) corresponds to T5/Z2, for which we argue t…
Degrees of freedom in two dimensional string theory
Sumit R. Das
We discuss two issues regarding the question of degrees of freedom in two dimensional string theory. The first issue relates to the classical limit of quantum string theory. In the…
Notes on a singular Landau-Ginzburg family
Debashis Ghoshal
We study some properties of a singular Landau-Ginzburg family characterized by the multi-variable superpotential . We will…
Rotating Black Holes which Saturate a Bogomol'nyi Bound
Gary Horowitz, Ashoke Sen
We construct and study the electrically charged, rotating black hole solution in heterotic string theory compactified on a dimensional torus. This black hole is characteri…
Dual Pairs of Type II String Compactification
Ashoke Sen, Cumrun Vafa
Using a -duality symmetry of type II compactification on represented by triality action on the -duality group, and applying the adiabatic argument we construct dual pai…
Folds, Bosonization and non-triviality of the classical limit of 2D string theory
Sumit R. Das, Samir D. Mathur
In the 1-dimensional matrix model one identifies the tachyon field in the asymptotic region with a nonlocal transform of the density of fermions. But there is a problem in relating…
Algebraic aspect and construction of Lax operators in quantum integrable systems
B Basu-Mallick, Anjan Kundu
An algebraic construction more general and intimately connected with that of Faddeev, along with its application for generating different classes of quantum integrable models a…
Discrete State Moduli of String Theory from c=1 Matrix Model
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We propose a new formulation of the space-time interpretation of the matrix model. Our formulation uses the well-known leg-pole factor that relates the matrix model amplitude…
Type IIA Dual of the Six-Dimensional CHL Compactification
John H. Schwarz, Ashoke Sen
We propose a candidate for the dual (in the weak/strong coupling sense) of the six-dimensional heterotic string compactification constructed recently by Chaudhuri, Hockney and Lykk…
The Topological Matrix Model Of c=1 String
Camillo Imbimbo, Sunil Mukhi
We derive a Kontsevich-type matrix model for the c=1 string directly from the W-infinity solution of the theory. The model that we obtain is different from previous proposals, whic…
EXTREMAL BLACK HOLES AND ELEMENTARY STRING STATES
Ashoke Sen
Some of the extremal black hole solutions in string theory have the same quantum numbers as the Bogomol'nyi saturated elementary string states. We explore the possibility that thes…
STRING STRING DUALITY CONJECTURE IN SIX DIMENSIONS AND CHARGED SOLITONIC STRINGS
Ashoke Sen
It has recently been conjectured that the type IIA string theory compactified on K3 and the heterotic string theory compactified on a four dimensional torus describe identical stri…
Covariantising the Beltrami equation in W-gravity
Suresh Govindarajan
Recently, certain higher dimensional complex manifolds were obtained in [hep-th/9412078] by associating a higher dimensional uniformisation to the generalised Teichmüller spaces of…
DUALITY SYMMETRY GROUP OF TWO DIMENSIONAL HETEROTIC STRING THEORY
Ashoke Sen
The equations of motion of the massless sector of the two dimensional string theory, obtained by compactifying the heterotic string theory on an eight dimensional torus, is known t…
Geometric Entropy of Nonrelativistic Fermions and Two Dimensional Strings
Sumit R. Das
We consider the geometric entropy of free nonrelativistic fermions in two dimensions and show that it is ultraviolet finite for finite fermi energies, but divergent in the infrared…
Quark Confinement and Dual Representation in 2+1 Dimensional Pure Yang-Mills Theory
Sumit R. Das, Spenta R. Wadia
We study the quark confinement problem in 2+1 dimensional pure Yang-Mills theory using euclidean instanton methods. The instantons are regularized and dressed Wu-Yang monopoles. Th…
String Beta Function Equations From c=1 Matrix Model
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We derive the -model tachyon -function equation of 2-dimensional string theory, in the background of flat space and linear dilaton, working entirely within the matrix m…