On Four-Dimensional Compactifications of F-Theory

Abstract

Branches of moduli space of F-theory in four dimensions are investigated. The transition between two branches is described as a 3-brane-instanton transition on a 7-brane. A dual heterotic picture of the transition is presented and the F-theory - heterotic theory map is given. The F-theory data - complex structure of the Calabi-Yau fourfold and the instanton bundle on the 7-brane is mapped to the heterotic bundle on the elliptic Calabi-Yau threefold CY_3. The full moduli space has a web structure which is also found in the moduli space of semi-stable bundles on $C{Y}_3$. Matter content of the four-dimensional theory is discussed in both F-theory and heterotic theory descriptions.

40 pages, TeX, references added, minor changes in Section 3

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