Hodge structures for orbifold cohomology

Fernandez, Javier

doi:10.1090/S0002-9939-06-08515-7

Hodge structures for orbifold cohomology
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by Javier Fernandez PDF

Proc. Amer. Math. Soc. 134 (2006), 2511-2520 Request permission

Abstract:

We construct a polarized Hodge structure on the primitive part of Chen and Ruan’s orbifold cohomology $H_{orb}^k(X)$ for projective $SL$-orbifolds $X$ satisfying a “Hard Lefschetz Condition”. Furthermore, the total cohomology $\bigoplus _{p,q}H_{orb}^{p,q}(X)$ forms a mixed Hodge structure that is polarized by every element of the Kähler cone of $X$. Using results of Cattani-Kaplan-Schmid this implies the existence of an abstract polarized variation of Hodge structure on the complexified Kähler cone of $X$. This construction should be considered as the analogue of the abstract polarized variation of Hodge structure that can be attached to the singular cohomology of a crepant resolution of $X$, in light of the conjectural correspondence between the (quantum) orbifold cohomology and the (quantum) cohomology of a crepant resolution.

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