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Marginal Deformations of WZNW and Coset Models from O(d,d) Transformation
S. F. Hassan, Ashoke Sen
We show that O(2,2) transformation of SU(2) WZNW model gives rise to marginal deformation of this model by the operator where , are U(1)…
Black Holes and Solitons in String Theory
Ashoke Sen
In this review, I discuss a general method for constructing classical solutions of the equations of motion arising in the effective low energy string theory, and discuss specific a…
Quantization of Dyon Charge and Electric-Magnetic Duality in String Theory
Ashoke Sen
We analyze the allowed spectrum of electric and magnetic charges carried by dyons in (toroidally compactified) heterotic string theory in four dimensions at arbitrary values of the…
Electric Magnetic Duality in String Theory
Ashoke Sen
The electric-magnetic duality transformation in four dimensional heterotic string theory discussed by Shapere, Trivedi and Wilczek is shown to be an exact symmetry of the equations…
Macroscopic Charged Heterotic String
Ashoke Sen
Classical solutions of equations of motion in low energy effective field theory, describing fundamental charged heterotic string, are found. These solutions automatically carry an…
Rotating Charged Black Hole Solution in Heterotic String Theory
Ashoke Sen
We construct a solution of the classical equations of motion arising in the low energy effective field theory for heterotic string theory. This solution describes a black hole in f…