Eikonal resummation and topological expansion coefficients in superstring theory
Abstract
We explicitly show that in the Regge regime of large s, fixed t the leading part of the gloop amplitude for the scattering of two gravitons is the product of g+1 tree amplitudes times the expectation value of a factorized operator. This result proves that the superstring loop series is summable in the eikonal approximation. We determine the normalization dictated by unitarity of all terms in the topological expansion as a function of the two independent constants in the theory, the string tension 1/α' and the coupling constant g.
Supported in part by the Danish National Science Research Council.
 Publication:

Physics Letters B
 Pub Date:
 July 1990
 DOI:
 10.1016/03702693(90)903365
 Bibcode:
 1990PhLB..244..397C