On R4 terms and MHV amplitudes in N = 5,6 supergravity vacua of Type II superstrings
Abstract
We compute one-loop threshold corrections to R4 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.
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