Unitary string amplitudes

Arjun Berera

doi:10.1016/0550-3213(94)90057-4

Unitary string amplitudes

Arjun Berera^*

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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.

Original language	English
Pages (from-to)	157-180
Number of pages	24
Journal	Nuclear physics b
Volume	411
Issue number	1
DOIs	https://doi.org/10.1016/0550-3213(94)90057-4
Publication status	Published - 3 Jan 1994

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abstract = "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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AB - 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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Unitary string amplitudes

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