Infinitesimal Derived Torelli Theorem for K3 surfaces

Details Infinitesimal Derived Torelli Theorem for K3 surfaces Infinitesimal Derived Torelli Theorem for K3 surfaces

2008-04-16

arxiv.org/abs/0804.2552v2

Mathematics

Algebraic Geometry

Main paper by E. Macri and P. Stellari. Appendix by S.Mehrotra. 21 pages. Final version to appear in Int. Math. Res. Not

Scientific paper

We prove that the first order deformations of two smooth projective K3 surfaces are derived equivalent under a Fourier--Mukai transform if and only if there exists a special isometry of the total cohomology groups of the surfaces which preserves the Mukai pairing, an infinitesimal weight-2 decomposition and the orientation of a positive 4-dimensional space. This generalizes the derived version of the Torelli Theorem. Along the way we show the compatibility of the actions on Hochschild homology and singular cohomology of any Fourier--Mukai functor.

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