An ansatz for a non-perturbative four-graviton amplitude in type IIB superstring theory

Details An ansatz for a non-perturbative four-graviton amplitude in type IIB superstring theory An ansatz for a non-perturbative four-graviton amplitude in type IIB superstring theory

1997-07-29

arxiv.org/abs/hep-th/9707241v3

Phys.Lett. B417 (1998) 253-258

Physics

High Energy Physics

High Energy Physics - Theory

Version appeared in Phys.Lett. B. Discussion expanded. 7 pages, harvmac

Scientific paper

10.1016/S0370-2693(97)01417-2

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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