Spontaneously Broken Space-Time Supersymmetry in Open String Theory without GSO Projection

Abstract

We argue that orientable open string theory without GSO projection has N=2 space-time supersymmetry in a spontaneously broken phase. The arguments are presented both in Neveu-Schwarz-Ramond and Green-Schwarz formulations. The formal but explicit supersymmetry transformation law for string field is given in the framework of Witten's open string field theory. Our results support a fundamental assumption which lies behind the topological construction of stable D-branes starting from the unstable systems of D9-branes.

29 pages, no figures, references are added, further typos of pulished version are corrected

References in corpus (1)

• Supersymmetric World-volume Action for Non-BPS D-branes

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