Complex Kuranishi structures and counting sheaves on Calabi-Yau 4-folds, II
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866911787479203840 |
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| author | Oh, Jeongseok Thomas, Richard P. |
| author_facet | Oh, Jeongseok Thomas, Richard P. |
| contents | We develop a theory of complex Kuranishi structures on projective schemes. These are sufficiently rigid to be equivalent to weak perfect obstruction theories, but sufficiently flexible to admit global complex Kuranishi charts.
We apply the theory to projective moduli spaces M of stable sheaves on Calabi-Yau 4-folds. Using real derived differential geometry, Borisov-Joyce produced a virtual homology cycle on M. In the prequel to this paper we constructed an algebraic virtual cycle on M. We prove the cycles coincide in homology after inverting 2 in the coefficients. And when Borisov-Joyce's real virtual dimension is odd, their virtual cycle is 2-torsion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_16441 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Complex Kuranishi structures and counting sheaves on Calabi-Yau 4-folds, II Oh, Jeongseok Thomas, Richard P. Algebraic Geometry 14N35 We develop a theory of complex Kuranishi structures on projective schemes. These are sufficiently rigid to be equivalent to weak perfect obstruction theories, but sufficiently flexible to admit global complex Kuranishi charts. We apply the theory to projective moduli spaces M of stable sheaves on Calabi-Yau 4-folds. Using real derived differential geometry, Borisov-Joyce produced a virtual homology cycle on M. In the prequel to this paper we constructed an algebraic virtual cycle on M. We prove the cycles coincide in homology after inverting 2 in the coefficients. And when Borisov-Joyce's real virtual dimension is odd, their virtual cycle is 2-torsion. |
| title | Complex Kuranishi structures and counting sheaves on Calabi-Yau 4-folds, II |
| topic | Algebraic Geometry 14N35 |
| url | https://arxiv.org/abs/2305.16441 |