On decompositions for Fano schemes of intersections of two quadrics

Pieter Belmans; Jishnu Bose; Sarah Frei; Benjamin Gould; James Hotchkiss; Alicia Lamarche; Jack Petok; Cristian Rodriguez Avila; Saket Shah

arXiv · 2403.12517

On decompositions for Fano schemes of intersections of two quadrics

Pieter Belmans·Jishnu Bose·Sarah Frei·Benjamin Gould·James Hotchkiss·Alicia Lamarche·Jack Petok·Cristian Rodriguez Avila·Saket Shah

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Abstract

We propose conjectural semiorthogonal decompositions for Fano schemes of linear subspaces on intersections of two quadrics, in terms of symmetric powers of the associated hyperelliptic (resp. stacky) curve. When the intersection is odd-dimensional, we moreover conjecture an identity in the Grothendieck ring of varieties and other motivic contexts. The evidence for these conjectures is given by upgrading recent results of Chen-Vilonen-Xue, to obtain formulae for the Hodge numbers of these Fano schemes. This allows us to numerically verify the conjecture in the hyperelliptic case, and establish a combinatorial identity as evidence for the stacky case.

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Pieter Belmans, Jishnu Bose, Sarah Frei, Benjamin Gould, James Hotchkiss, Alicia Lamarche, Jack Petok, Cristian Rodriguez Avila, Saket Shah. 2024-03-19. On decompositions for Fano schemes of intersections of two quadrics. https://arxiv.org/abs/2403.12517

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