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Schiffer variations and the generic Torelli theorem for hypersurfaces

Published online by Cambridge University Press:  08 February 2022

Claire Voisin*
Affiliation:
CNRS, IMJ-PRG, 4 Place Jussieu, 75005 Paris, France claire.voisin@imj-prg.fr

Abstract

We prove the generic Torelli theorem for hypersurfaces in $\mathbb {P}^{n}$ of degree $d$ dividing $n+1$, for $d$ sufficiently large. Our proof involves the higher-order study of the variation of Hodge structure along particular one-parameter families of hypersurfaces that we call ‘Schiffer variations.’ We also analyze the case of degree $4$. Combined with Donagi's generic Torelli theorem and results of Cox and Green, this shows that the generic Torelli theorem for hypersurfaces holds with finitely many exceptions.

Type
Research Article
Copyright
© 2022 The Author(s). The publishing rights in this article are licensed to Foundation Compositio Mathematica under an exclusive licence

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Footnotes

The author is supported by the ERC Synergy Grant HyperK (Grant agreement No. 854361).

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