BPS Spectra and Non--Perturbative Couplings in N=2,4 Supersymmetric String Theories

Details BPS Spectra and Non--Perturbative Couplings in N=2,4 Supersymmetric String Theories BPS Spectra and Non--Perturbative Couplings in N=2,4 Supersymmetric String Theories

1995-12-18

arxiv.org/abs/hep-th/9512129v3

Nucl.Phys.B464:18-58,1996

Physics

High Energy Physics

High Energy Physics - Theory

44 pages, LaTeX. Minor changes, version that will appear in Nucl. Phys. B

Scientific paper

10.1016/0550-3213(96)00069-7

We study the BPS spectrum in $D=4, N=4$ heterotic string compactifications, with some emphasis on intermediate $N=4$ BPS states. These intermediate states, which can become short in $N=2$ compactifications, are crucial for establishing an $S-T$ exchange symmetry in $N=2$ compactifications. We discuss the implications of a possible $S-T$ exchange symmetry for the $N=2$ BPS spectrum. Then we present the exact result for the 1-loop corrections to gravitational couplings in one of the heterotic $N=2$ models recently discussed by Harvey and Moore. We conjecture this model to have an $S-T$ exchange symmetry. This exchange symmetry can then be used to evaluate non-perturbative corrections to gravitational couplings in some of the non-perturbative regions (chambers) in this particular model and also in other heterotic models.

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