A simpler prescription for MHV graviton tree amplitudes in superstring theory
arXiv:1308.6456 · doi:10.1007/JHEP11(2013)035
Abstract
We extend the Berkovits-Maldacena prescription for MHV amplitudes of the open superstring to the closed superstring, showing that in the α'=0 limit it reduces to the result of supergravity found recently by Hodges. We also verify that this prescription calculates the correct superstring tree level MHV amplitude for 4 gravitons including α' corrections.
33 pages, 7 figures; v2: appendix corrected, footnote 14 added, reference 15 upgraded, typos fixed