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The Hodge Numbers of Divisors of Calabi-Yau Threefold Hypersurfaces

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arxiv 1712.04946 v1 pith:6CZSCRCR submitted 2017-12-13 hep-th math.ACmath.AG

Andreas P. Braun , Cody Long , Liam McAllister , Michael Stillman , Benjamin Sung This is my paper · ORCID
classification hep-thmath.ACmath.AG
keywords calabi-yaudivisorshodgenumbersthreefoldeuclideanhypersurfacesbranes
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abstract

We prove a formula for the Hodge numbers of square-free divisors of Calabi-Yau threefold hypersurfaces in toric varieties. Euclidean branes wrapping divisors affect the vacuum structure of Calabi-Yau compactifications of type IIB string theory, M-theory, and F-theory. Determining the nonperturbative couplings due to Euclidean branes on a divisor $D$ requires counting fermion zero modes, which depend on the Hodge numbers $h^i({\cal{O}}_D)$. Suppose that $X$ is a smooth Calabi-Yau threefold hypersurface in a toric variety $V$, and let $D$ be the restriction to $X$ of a square-free divisor of $V$. We give a formula for $h^i({\cal{O}}_D)$ in terms of combinatorial data. Moreover, we construct a CW complex $\mathscr{P}_D$ such that $h^i({\cal{O}}_D)=h_i(\mathscr{P}_D)$. We describe an efficient algorithm that makes possible for the first time the computation of sheaf cohomology for such divisors at large $h^{1,1}$. As an illustration we compute the Hodge numbers of a class of divisors in a threefold with $h^{1,1}=491$. Our results are a step toward a systematic computation of Euclidean brane superpotentials in Calabi-Yau hypersurfaces.

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Cited by 5 Pith papers

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