Scattering Amplitudes and the CPT theorem in String Theory
A. Pasquinucci, K. Roland
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>2.
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