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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…
Developments in Superstring Theory
Ashoke Sen
In this talk I review recent developments in superstring theory. In the first half of the talk I discuss some of the earlier developments in this subject. This includes a review of…
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…