Soft behavior of a closed massless state in superstring and universality of the soft behavior of the dilaton

Paolo di Vecchia, Raffaele Marotta, Matin Mojaza

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Abstract

We consider the tree-level scattering amplitudes in the NS-NS (Neveu-Schwarz) massless sector of closed superstrings in the case where one external state becomes soft. We compute the amplitudes generically for any number of dimensions and any number and kind of the massless closed states through the subsubleading order in the soft expansion. We show that, when the soft state is a graviton or a dilaton, the full result can be expressed as a soft theorem factorizing the amplitude in a soft and a hard part. This behavior is similar to what has previously been observed in field theory and in the bosonic string. Differently from the bosonic string, the supersymmetric soft theorem for the graviton has no string corrections at subsubleading order. The dilaton soft theorem, on the other hand, is found to be universally free of string corrections in any string theory.
OriginalsprogEngelsk
Artikelnummer020
TidsskriftJournal of High Energy Physics
Vol/bind2016
Udgave nummer020
Sider (fra-til)20-45
Antal sider25
ISSN1126-6708
DOI
StatusUdgivet - 6 dec. 2016

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