Orientifold Limit of F-theory Vacua

Abstract

We show how an F-theory compactified on a Calabi-Yau (n+1)-fold in appropriate weak coupling limit reduces formally to an orientifold of type IIB theory compactified on an auxiliary complex n-fold. In some cases (but not always) if the original (n+1)-fold is singular, then the auxiliary n-fold is also singular. We illustrate this by analysing F-theory on elliptically fibered Calabi-Yau 3-folds on base $F_n$.

LaTeX file, 11 pages, additional argument for Calabi-Yau nature of the auxiliary manifold, one extra reference

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