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Heterotic-heterotic string duality and multiple K3 fibrations
Physics Letters B
A type IIA string compactified on a Calabi-Yau manifold which admits a K3 fibration is believed to be equivalent to a heterotic string in four dimensions. We study cases where a Calabi-Yau manifold can have more than one such fibration leading to equivalences between perturbatively inequivalent heterotic strings. This allows an analysis of an example in six dimensions due to Duff, Minasian and Witten and enables us to go some way to prove a conjecture by Kachru and Vafa. The interplay betweendoi:10.1016/0370-2693(96)00551-5 fatcat:eo6bknehgrcwrnjdzefpwq5iyq