Stable non-BPS states in string theory: a pedagogical review

Details Stable non-BPS states in string theory: a pedagogical review Stable non-BPS states in string theory: a pedagogical review

1999-05-02

arxiv.org/abs/hep-th/9905006v2

Int.J.Mod.Phys.A15:771-820,2000

Physics

High Energy Physics

High Energy Physics - Theory

58 pages, 1 figure; minor corrections

Scientific paper

10.1142/S0217751X00000380

We present a pedagogical review of the stable non-BPS states in string theory which have recently attracted some attention in the literature. In particular, following the analysis of A. Sen, we discuss in detail the case of the stable non-BPS D-particle of Type I theory whose existence is predicted (and required) by the heterotic/Type I duality. We show that this D-particle originates from an unstable bound state formed by a D1/anti-D1 pair of Type IIB in which the tachyon field acquires a solitonic kink configuration. The mechanism of tachyon condensation is discussed first at a qualitative level and then with an exact conformal field theory analysis.

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