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

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

1996-10-30

arxiv.org/abs/hep-th/9610237v1

Phys.Rev. D57 (1998) 2323-2328

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, harvmac, no figures

Scientific paper

10.1103/PhysRevD.57.2323

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.

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