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Cyclic covers: Hodge theory and categorical Torelli theorems
Dell, Hannah; JACOVSKIS, Augustinas; Rota, Franco
2023
 

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Keywords :
Mathematics - Algebraic Geometry; 14F08, 14J45, 14C34
Abstract :
[en] Let $Y$ admit a rectangular Lefschetz decomposition of its derived category, and consider a cyclic cover $X\to Y$ ramified over a divisor $Z$. In a setting not considered by Kuznetsov and Perry, we define a subcategory $\mathcal{A}_Z$ of the equivariant derived category of $X$ which contains, rather than is contained in, $\mathrm{D}^{\mathrm{b}}(Z)$. We then show that the equivariant category of the Kuznetsov component of $X$ is decomposed into copies of $\mathcal{A}_Z$. As an application, we relate $\mathcal{A}_Z$ with the cohomology of $Z$ under some numerical assumptions. In particular, we obtain a categorical Torelli theorem for the prime Fano threefolds of index 1 and genus 2.
Disciplines :
Mathematics
Author, co-author :
Dell, Hannah 
JACOVSKIS, Augustinas  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Mathematics (DMATH)
Rota, Franco 
 These authors have contributed equally to this work.
Language :
English
Title :
Cyclic covers: Hodge theory and categorical Torelli theorems
Publication date :
08 December 2023
Version :
2
Available on ORBilu :
since 27 November 2023

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