A Note on Soft Factors for Closed String Scattering

Abstract

In this note, it is shown that closed string graviton scattering amplitudes obey the same subleading soft limit as field theory graviton scattering amplitudes. The result is derived using a combination of recent results and methods including the subleading soft expansion for type I open string gluon disk scattering amplitudes, the single value projection for multiple $\zeta$ values, and the KLT relations in field and string theory.

12 pages

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Cited by in corpus (3)

• Soft behavior of a closed massless state in superstring and universality in the soft behavior of the dilaton
• Soft Theorems from Effective Field Theory
• Soft theorem for the graviton, dilaton and the Kalb-Ramond field in the bosonic string