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 ζ values, and the KLT relations in field and string theory.
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Schwab, B.U.W. A note on soft factors for closed string scattering. J. High Energ. Phys. 2015, 140 (2015). https://doi.org/10.1007/JHEP03(2015)140
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DOI: https://doi.org/10.1007/JHEP03(2015)140