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On the motive of O’Grady’s ten-dimensional hyper-Kähler varieties

Radboud University, IMAPP, Heyendaalseweg 135, 6525 AJ, Nijmegen, Netherlands

Université Claude Bernard Lyon 1, Institut Camille Jordan, 43 Boulevard du 11 novembre 1918, 69622 Cedex Villeurbanne, France

E-mail Address: fu@math.univ-lyon1.fr

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Ziyu Zhang

ShanghaiTech University, Institute of Mathematical Sciences, 393 Middle Huaxia Road, Shanghai 201210, P. R. China

E-mail Address: zhangziyu@shanghaitech.edu.cn

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https://doi.org/10.1142/S0219199720500340Cited by:7 (Source: Crossref)

Abstract

We investigate how the motive of hyper-Kähler varieties is controlled by weight-2 (or surface-like) motives via tensor operations. In the first part, we study the Voevodsky motive of singular moduli spaces of semistable sheaves on K3 and abelian surfaces as well as the Chow motive of their crepant resolutions, when they exist. We show that these motives are in the tensor subcategory generated by the motive of the surface, provided that a crepant resolution exists. This extends a recent result of Bülles to the O’Grady-10 situation. In the non-commutative setting, similar results are proved for the Chow motive of moduli spaces of (semi-)stable objects of the K3 category of a cubic fourfold. As a consequence, we provide abundant examples of hyper-Kähler varieties of O’Grady-10 deformation type satisfying the standard conjectures. In the second part, we study the André motive of projective hyper-Kähler varieties. We attach to any such variety its defect group, an algebraic group which acts on the cohomology and measures the difference between the full motive and its weight-2 part. When the second Betti number is not 3, we show that the defect group is a natural complement of the Mumford–Tate group inside the motivic Galois group, and that it is deformation invariant. We prove the triviality of this group for all known examples of projective hyper-Kähler varieties, so that in each case the full motive is controlled by its weight-2 part. As applications, we show that for any variety motivated by a product of known hyper-Kähler varieties, all Hodge and Tate classes are motivated, the motivated Mumford–Tate conjecture 7.3 holds, and the André motive is abelian. This last point completes a recent work of Soldatenkov and provides a different proof for some of his results.

Keywords:

AMSC: 14D20, 14C15, 14J28, 14F05, 14J32, 53C26

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Received 12 December 2019

Revised 17 March 2020

Accepted 18 March 2020

Published: 17 July 2020

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This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY) License which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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On the motive of O’Grady’s ten-dimensional hyper-Kähler varieties

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