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15 papers · 2 filters
Black Hole Solutions in Heterotic String Theory on a Torus
Ashoke Sen
We construct the general electrically charged, rotating black hole solution in the heterotic string theory compactified on a six dimensional torus and study its classical propertie…
Higher dimensional uniformisation and W-geometry
Suresh Govindarajan
We formulate the uniformisation problem underlying the geometry of W_n-gravity using the differential equation approach to W-algebras. We construct W_n-space (analogous to superspa…
Massive particle creation in a static 1+1 dimensional spacetime
D. J. Lamb, A. Z. Capri, S. M. Roy
We show explicitly that there is particle creation in a static spacetime. This is done by studying the field in a coordinate system based on a physical principle which has recently…
Leading Large N Modification of QCD_2 on a Cylinder by Dynamical Fermions
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We consider 2-dimensional QCD on a cylinder, where space is a circle. We find the ground state of the system in case of massless quarks in a expansion. We find that coupling…
Topological 2D String Theory: Higher-genus Amplitudes and W-infinity Identities
Debashis Ghoshal, Camillo Imbimbo, Sunil Mukhi
We investigate Landau-Ginzburg string theory with the singular superpotential X^{-1} on arbitrary Riemann surfaces. This theory, which is a topological version of the c=1 string at…
Background Independent Algebraic Structures in Closed String Field Theory
Ashoke Sen, Barton Zwiebach
We construct a Batalin-Vilkovisky (BV) algebra on moduli spaces of Riemann surfaces. This algebra is background independent in that it makes no reference to a state space of a conf…
Strong-Weak Coupling Duality in Three Dimensional String Theory
Ashoke Sen
Following an old result of Marcus and Schwarz we argue that in the heterotic string theory compactified on a seven dimensional torus, the target space duality group O(7,23;Z) and t…
O(d,d;R) Deformations of Complex Structures and Extended Worldsheet Supersymmetry
S. F. Hassan
It is shown that the O(d,d;R) deformations of the superstring vacua and the O(d,d+16;R) deformations of the heterotic string vacua preserve extended worldsheet supersymmetry and, h…
String Field Theory of Two Dimensional QCD on a Cylinder: A Realization of W-infinity Current Algebra
Avinash Dhar, Porus Lakdawala, Gautam Mandal +1
We consider 2-dimensional QCD on a cylinder, where space is a circle of length . We formulate the theory in terms of gauge-invariant gluon operators and multiple-winding meson (…
Boundary Dynamics in Dilaton Gravity
Sumit R. Das, Sudipta Mukherji
We study the dynamics of the boundary dilaton gravity coupled to N massles scalars. We rederive the boundary conditions of [1] and [3] in a way which makes the requirement of repar…
A proposal for the geometry of W_n gravity
Suresh Govindarajan, T. Jayaraman
We relate the Teichmuller spaces obtained by Hitchin to the Teichmuller spaces of -gravity. The relationship of this space to -gravity is obtained by identifying the fla…
String Field Theory of Two Dimensional QCD: A Realization of W-infinity Algebra
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We consider the formulation of two dimensional QCD in terms of gauge invariant bilocal operators (string field) which satisfy a algebra. In analogy with our work on the…
Strong-Weak Coupling Duality in Four Dimensional String Theory
Ashoke Sen
We present several pieces of evidence for strong-weak coupling duality symmetry in the heterotic string theory, compactified on a six dimensional torus. These include symmetry of t…
Dyon - Monopole Bound States, Self-Dual Harmonic Forms on the Multi-Monopole Moduli Space, and SL(2,Z) Invariance in String Theory
Ashoke Sen
Existence of SL(2,Z) duality in toroidally compactified heterotic string theory (or in the N=4 supersymmetric gauge theories), that includes the strong weak coupling duality transf…
Black Hole Formation and Space-Time Fluctuations in Two Dimensional Dilaton Gravity and Complementarity
Sumit R. Das, Sudipta Mukherji
We study black hole formation in a model of two dimensional dilaton gravity and 24 massless scalar fields with a boundary. We find the most general boundary condition consistent wi…