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Nuclear Physics B
We study n-string amplitudes with one or two strings off-shell using the Polyakov path integral. The residues of the poles of these amplitudes correspond to the correct S-matrix elements. The coupling of gravitons to off-shell amplitudes shows that objects invariant under all world-sheet symmetries are also invariant under spacetime gauge symmetries. We interpret our results in terms of a local operator expansion.
Cohen, A., Moore, G., Nelson, P. C., & Polchinski, J. (1987). Semi-Off-Shell String Amplitudes. Nuclear Physics B, 281 (1), 127-144. http://dx.doi.org/10.1016/0550-3213(87)90250-1
Date Posted: 01 May 2017
This document has been peer reviewed.