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Dispersion relations in string theory

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Abstract

We analyze the analytic continuation of the formally divergent one-loop amplitude for scattering of the gravitonmultiplet in the Type II superstring. In particular we obtain explicit double and single dispersion relations, formulas for all the successive branch cuts extending out to +∞, as well as for the decay rate of a massive string state of arbitrary mass2N into two string states of lower mass. We compare our results with the box diagram in a superposition of φ3-like field theories. The stringy effects are traced to a convergence problem in this superposition.

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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 98. No. 3, pp. 442–455, March, 1994.

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D'Hoker, E., Phong, D.H. Dispersion relations in string theory. Theor Math Phys 98, 306–316 (1994). https://doi.org/10.1007/BF01102207

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  • DOI: https://doi.org/10.1007/BF01102207

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