Abstract
We study F-theory duals of six-dimensional heterotic vacua in extreme regions of moduli space where the heterotic string is very strongly coupled. We demonstrate how to use orientifold limits of these F-theory duals to regain a perturbative string description. As an example, we reproduce the spectrum of a T 4/ Z 4 orientifold as an F-theory vacuum with a singular K3 fibration. We relate this vacuum to previously studied heterotic E 8 × E 8 compactifications on K3.
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