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On the Complementarity of F-theory, Orientifolds, and Heterotic Strings

P. Berglund·E. G. Gimon
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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 $T^4/\ZZ_{4}$ orientifold as an F-theory vacuum with a singular $K3$ fibration. We relate this vacuum to previously studied heterotic $E_8\times E_8$ compactifications on $K3$.

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P. Berglund, E. G. Gimon. 1998-04-28. On the Complementarity of F-theory, Orientifolds, and Heterotic Strings. https://doi.org/10.1016/s0550-3213(98)00344-7

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