An ansatz for a non-perturbative four-graviton amplitude in type IIB superstring theory
J. G. Russo
Abstract
A natural SL(2,Z) invariant generalization of the Veneziano amplitude in type IIB superstring theory is investigated. It includes certain perturbative and non-perturbative (D-instanton) contributions, and it reduces to the correct expressions in different limits. The singularities are poles in the s-t-u channels, corresponding to the exchange of particles with a mass spectrum coinciding with that of (p,q) string states. We describe the general structure of the associated perturbative corrections to the effective action.
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