On R^4 terms and MHV amplitudes in N = 5,6 supergravity vacua of Type II superstrings

TL;DR

This paper calculates one-loop and non-perturbative corrections to R^4 terms in N=5,6 supergravity from Type II superstrings and derives generating functions for MHV amplitudes at tree level.

Contribution

It provides the first detailed computation of one-loop threshold corrections and non-perturbative effects in N=5,6 supergravities from Type II superstrings, along with MHV amplitude generating functions.

Findings

Computed one-loop threshold corrections to R^4 terms.

Discussed non-perturbative corrections from D-brane instantons.

Derived generating functions for MHV amplitudes in N=5,6 supergravities.

Abstract

We compute one-loop threshold corrections to R^4 terms in N= 5,6 supergravity vacua of Type II superstrings. We then discuss non-perturbative corrections generated by asymmetric D-brane instantons. Finally we derive generating functions for MHV amplitudes at tree level in N = 5, 6 supergravities.