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F4 Terms in N=4 String Vacua

C. Bachas, E. Kiritsis

hep-tharXiv:hep-th/9611205

Abstract

We discuss Fμν4 terms in torroidal compactifications of type-I and heterotic SO(32) string theory. We give a simple argument why only short BPS multiplets contribute to these terms at one loop, and verify heterotic-type-I duality to this order.

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