Semi-Off-Shell String Amplitudes
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Physical Sciences and Mathematics
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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.
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1987
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Nuclear Physics B
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At the time of publication, author Philip C. Nelson was affiliated with Harvard University. Currently, he is a faculty member in the Physics & Astronomy Department at the University of Pennsylvania.