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Unitary string amplitudes

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Original languageEnglish
Pages (from-to)157-180
Number of pages24
JournalNuclear physics b
Issue number1
Publication statusPublished - 3 Jan 1994


The scattering amplitudes of string theory are divergent when the Riemann surface has a particular degeneracy associated with loops becoming infinitely long. These divergences originate from multiparticle intermediate states. The string amplitudes do not have the imaginary part required by unitarity. We give a prescription for defining string amplitudes that extends to all tachyon-free string theories. Explicit applications of our procedure are given at one-loop level for the Green-Schwarz and Neveu-Schwarz-Ramond theories. Our procedure is valid for higher loops also. However, only some simple features for this situation are explicitly discussed.

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