Vanishing Theorems for Locally Conformal Hyperk\"ahler Manifolds

M. S. Verbitsky

Trudy Matematicheskogo Instituta imeni V.A. Steklova, Algebraic geometry: Methods, relations, and applications, Tome 246 (2004), pp. 64-91.

Résumé

Let $M$ be a compact locally conformal hyperkähler manifold. We prove a version of the Kodaira–Nakano vanishing theorem for $M$. This is used to show that $M$ admits no holomorphic differential forms and the cohomology of the structure sheaf $H^i(\mathcal O_M)$ vanishes for $i>1$. We also prove that the first Betti number of $M$ is $1$. This leads to a structure theorem for locally conformal hyperkähler manifolds that describes them in terms of $3$-Sasakian geometry. Similar results are proven for compact Einstein–Weyl locally conformal Kähler manifolds.

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