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BPS D-branes on Non-supersymmetric Cycles
Ashoke Sen
In certain regions of the moduli space of K3 and Calabi-Yau manifolds, D-branes wrapped on non-supersymmetric cycles may give rise to stable configurations. We show that in the orb…
Type I D-particle and its Interactions
Ashoke Sen
In a previous paper (hep-th/9808141) we showed that the type I string theory contains a stable non-BPS D-particle carrying SO(32) spinor charge. In this paper we formulate the rule…
SO(32) Spinors of Type I and Other Solitons on Brane-Antibrane Pair
Ashoke Sen
We construct the SO(32) spinor state in weakly coupled type I string theory as a kink solution of the tachyon field on the D-string - anti-D-string pair and calculate its mass. We…
Tachyon Condensation on the Brane Antibrane System
Ashoke Sen
A coincident D-brane - anti-D-brane pair has a tachyonic mode. We present an argument showing that at the classical minimum of the tachyonic potential the negative energy density a…
Stable Non-BPS Bound States of BPS D-branes
Ashoke Sen
S-duality symmetry of type IIB string theory predicts the existence of a stable non-BPS state on an orbifold five plane of the type IIB theory if the orbifold group is generated by…
Stable Non-BPS States in String Theory
Ashoke Sen
Many string theories contain states which are not BPS, but are stable due to charge conservation. In many cases the description of these states in the strong coupling limit remains…
An Introduction to Non-perturbative String Theory
Ashoke Sen
In this review I discuss some basic aspects of non-perturbative string theory. The topics include test of duality symmetries based on the analysis of the low energy effective actio…