Scattering Amplitudes and the CPT theorem in String Theory

preprint1996arXivOpen access

Abstract

We discuss the role of the CPT transformation in first quantized string theories, both on the world-sheet and in the space-time. We explicitly show that the space-time CPT theorem holds for all first-quantized (perturbative) string theories in a Minkowski background of even dimension D>2D>2.

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