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CPT Invariance of String Models in a Minkowski Background

Andrea Pasquinucci, Kaj Roland

hep-tharXiv:hep-th/9602026

Abstract

We study the space-time CPT properties of string theories formulated in a flat Minkowski background of even dimension. We define CPT as a world-sheet transformation acting on the vertex operators and we prove the CPT invariance of the string S-matrix elements. Some related issues, including the connection between spin and statistics of physical string states, are also considered.

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