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

@inproceedings{Harvey1996FivebraneIA,
  title={Fivebrane Instantons and R 2 couplings in N = 4 String Theory},
  author={Jeffrey A. Harvey and Gregory Moore},
  year={1996}
}
We compute the gravitational coupling F1 for IIA string theory on K3 × T 2 and use string-string duality to deduce the corresponding term for heterotic string on T . The latter is an infinite sum of gravitational instanton effects which we associate with the effects of Euclidean fivebranes wrapped on T . These fivebranes are the neutral fivebranes or zero size instantons of heterotic string theory. 
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