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On the soft limit of tree-level string amplitudes

Massimo Bianchi, Andrea L. Guerrieri

Abstract

We study the soft behavior of string scattering amplitudes at three level with massless and massive external insertions, relying on different techniques to compute 4-points amplitudes respectively with open or closed strings.

On the soft limit of tree-level string amplitudes

Abstract

We study the soft behavior of string scattering amplitudes at three level with massless and massive external insertions, relying on different techniques to compute 4-points amplitudes respectively with open or closed strings.

Paper Structure

This paper contains 9 sections, 26 equations.

Table of Contents

  1. General introduction
  2. Soft theorems in QFT and strings
  3. Gluon amplitudes in QFT
  4. Gluon amplitudes in string theory
  5. Soft behavior of disk scattering amplitudes with massive states
  6. Massive string amplitudes from Yang-Mills
  7. Dimensional reduction at $D=4$
  8. Massive string amplitudes in $D=4$
  9. Closed superstring amplitudes