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• W2952509512 abstract "This paper suggests a new approach to questions of rationality of threefolds based on category theory. Following M. Ballard, D. Favero, L. Katzarkov (ArXiv:1012.0864) and D. Favero, L. Katzarkov (Noether--Lefschetz Spectra and Algebraic cycles, in preparation) we enhance constructions from A. Kuznetsov (arXiv:0904.4330) by introducing Noether--Lefschetz spectra --- an interplay between Orlov spectra (C. Oliva, Algebraic cycles and Hodge theory on generalized Reye congruences, Compos. Math. 92, No. 1 (1994) 1--22) and Hochschild homology. The main goal of this paper is to suggest a series of interesting examples where above techniques might apply. We start by constructing a sextic double solid $X$ with 35 nodes and torsion in $H^3(X,mathbb Z)$. This is a novelty --- after the classical example of Artin and Mumford (1972), this is the second example of a Fano threefold with a torsion in the 3-rd integer homology group. In particular $X$ is non-rational. We consider other examples as well --- $V_{10}$ with 10 singular points and double covering of quadric ramified in octic with 20 nodal singular points. After analyzing the geometry of their Landau--Ginzburg models we suggest a general non-rationality picture based on Homological Mirror Symmetry and category theory." @default.
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• W2952509512 date "2011-02-10" @default.
• W2952509512 modified "2023-09-28" @default.
• W2952509512 title "Double solids, categories and non-rationality" @default.
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