Cech - de Rham Chern character on the stack of holomorphic vector bundles
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| Format: | Preprint |
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2025
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| _version_ | 1866915235767517184 |
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| author | Glass, Cheyne Tradler, Thomas Zeinalian, Mahmoud |
| author_facet | Glass, Cheyne Tradler, Thomas Zeinalian, Mahmoud |
| contents | We provide a formula for the Chern character of a holomorphic vector bundle in the hyper-cohomology of the de Rham complex of holomorphic sheaves on a complex manifold. This Chern character can be thought of as a completion of the Chern character in Hodge cohomology obtained as the trace of the exponential of the Atiyah class, which is Čech closed, to one that is Čech-Del closed. Such a completion is a key step toward lifting O'Brian-Toledo-Tong invariants of coherent sheaves from Hodge cohomology to de Rham cohomology. An alternate approach toward the same end goal, instead using simplicial differential forms and Green complexes, can be found in Hosgood's works [Ho1, Ho2]. In the algebraic setting, and more generally for Kähler manifolds, where Hodge and de Rham cohomologies agree, such extensions are not necessary, whereas in the non-Kähler, or equivariant settings the two theories differ. We provide our formulae as a map of simplicial presheaves, which readily extend the results to the equivariant setting and beyond. This paper can be viewed as a sequel to [GMTZ1] which covered such a discussion in Hodge cohomology. As an aside, we give a conceptual understanding of how formulas obtained by Bott and Tu for Chern classes using transition functions and those from Chern-Weil theory using connections, are part of a natural unifying story. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_07407 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cech - de Rham Chern character on the stack of holomorphic vector bundles Glass, Cheyne Tradler, Thomas Zeinalian, Mahmoud Algebraic Geometry Algebraic Topology 19L10, 18F20 (primary), and 58J28, 55N05, 18N50 (secondary) We provide a formula for the Chern character of a holomorphic vector bundle in the hyper-cohomology of the de Rham complex of holomorphic sheaves on a complex manifold. This Chern character can be thought of as a completion of the Chern character in Hodge cohomology obtained as the trace of the exponential of the Atiyah class, which is Čech closed, to one that is Čech-Del closed. Such a completion is a key step toward lifting O'Brian-Toledo-Tong invariants of coherent sheaves from Hodge cohomology to de Rham cohomology. An alternate approach toward the same end goal, instead using simplicial differential forms and Green complexes, can be found in Hosgood's works [Ho1, Ho2]. In the algebraic setting, and more generally for Kähler manifolds, where Hodge and de Rham cohomologies agree, such extensions are not necessary, whereas in the non-Kähler, or equivariant settings the two theories differ. We provide our formulae as a map of simplicial presheaves, which readily extend the results to the equivariant setting and beyond. This paper can be viewed as a sequel to [GMTZ1] which covered such a discussion in Hodge cohomology. As an aside, we give a conceptual understanding of how formulas obtained by Bott and Tu for Chern classes using transition functions and those from Chern-Weil theory using connections, are part of a natural unifying story. |
| title | Cech - de Rham Chern character on the stack of holomorphic vector bundles |
| topic | Algebraic Geometry Algebraic Topology 19L10, 18F20 (primary), and 58J28, 55N05, 18N50 (secondary) |
| url | https://arxiv.org/abs/2504.07407 |