Soft Theorems from String Theory

TL;DR

This paper investigates the soft behavior of closed string amplitudes involving various particles and the double soft limit of gluons, deriving field theory expressions from string theory results.

Contribution

It provides a detailed analysis of soft theorems in string theory and connects string amplitudes to field theory in the tensionless limit.

Findings

Soft theorems for dilatons, gravitons, and anti-symmetric tensors established.

Double soft limit of gluons analyzed from open string amplitudes.

Field theory expressions derived from string theory results.

Abstract

Soft behaviour of closed string amplitudes involving dilatons, gravitons and anti-symmetric tensors, is studied in the framework of bosonic string theory. The leading double soft limit of gluons is analysed as well, starting from scattering amplitudes computed in the open bosonic string. Field theory expressions are then obtained by sending the string tension to infinity. The presented results have been derived in the papers of Ref.[1].