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How Does a Fundamental String Stretch its Horizon?
Ashoke Sen
It has recently been shown that if we take into account a class of higher derivative corrections to the effective action of heterotic string theory, the entropy of the black hole s…
Tachyon Dynamics in Open String Theory
Ashoke Sen
In this review we describe our current understanding of the properties of open string tachyons on an unstable D-brane or brane-antibrane system in string theory. The various string…
Symmetries, Conserved Charges and (Black) Holes in Two Dimensional String Theory
Ashoke Sen
Two dimensional string theory is known to have an infinite dimensional symmetry, both in the continuum formalism as well as in the matrix model formalism. We develop a systematic p…
Energy Momentum Tensor and Marginal Deformations in Open String Field Theory
Ashoke Sen
Marginal boundary deformations in a two dimensional conformal field theory correspond to a family of classical solutions of the equations of motion of open string field theory. In…
Rolling Tachyon Boundary State, Conserved Charges and Two Dimensional String Theory
Ashoke Sen
The boundary state associated with the rolling tachyon solution on an unstable D-brane contains a part that decays exponentially in the asymptotic past and the asymptotic future, b…