Fivebrane Instantons and $R^2$ couplings in $N=4$ String Theory

Abstract

We compute the gravitational coupling $F_1$ for IIA string theory on $K3\times T^2$ and use string-string duality to deduce the corresponding term for heterotic string on $T^6$. The latter is an infinite sum of gravitational instanton effects which we associate with the effects of Euclidean fivebranes wrapped on $T^6$. These fivebranes are the neutral fivebranes or zero size instantons of heterotic string theory.

16 pages, harvmac, no figures

References in corpus (3)

• IR Dynamics on Branes and Space-Time Geometry
• A note on brane tension and M-theory
• Exact Gravitational Threshold Correction in the FHSV Model

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