On decompositions for Fano schemes of intersections of two quadrics
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866929304838864896 |
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| author | Belmans, Pieter Bose, Jishnu Frei, Sarah Gould, Benjamin Hotchkiss, James Lamarche, Alicia Petok, Jack Avila, Cristian Rodriguez Shah, Saket |
| author_facet | Belmans, Pieter Bose, Jishnu Frei, Sarah Gould, Benjamin Hotchkiss, James Lamarche, Alicia Petok, Jack Avila, Cristian Rodriguez Shah, Saket |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12517 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On decompositions for Fano schemes of intersections of two quadrics Belmans, Pieter Bose, Jishnu Frei, Sarah Gould, Benjamin Hotchkiss, James Lamarche, Alicia Petok, Jack Avila, Cristian Rodriguez Shah, Saket Algebraic Geometry 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. |
| title | On decompositions for Fano schemes of intersections of two quadrics |
| topic | Algebraic Geometry |
| url | https://arxiv.org/abs/2403.12517 |