Mapping Cone and Morse Theory
| Autor: | Clausen, David, Tang, Xiang, Tseng, Li-Sheng |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | On a smooth manifold, we associate to any closed differential form a mapping cone complex. The cohomology of this mapping cone complex can vary with the de Rham cohomology class of the closed form. We present a novel Morse theoretical description for the mapping cone cohomology. Specifically, we introduce a Morse complex for the mapping cone complex which is generated by pairs of critical points with the differential defined by gradient flows and an integration of the closed form over spaces of gradient flow lines. We prove that the cohomology of our cone Morse complex is isomorphic to the mapping cone cohomology and hence independent of both the Riemannian metric and the Morse function used to define the complex. We also obtain sharp inequalities that bound the dimension of the mapping cone cohomology in terms of the number of Morse critical points and the properties of the specified closed form. Our results are widely applicable, especially for any manifold equipped with a geometric structure described by a closed differential form. We also obtain a bound on the difference between the number of Morse critical points and the Betti numbers. Comment: 40 pages. v1:This paper is an outgrowth of v1 of arXiv:2211.11712 which has been greatly expanded and separated into 2 papers: (1) the replaced version of arXiv:2211.11712 concerns symplectic manifolds and uses analytic-based method; (2) this paper which defines the general notion of a cone Morse theory for smooth manifolds with respect to any closed form. v2:Typos corrected, clarifications added |
| Databáze: | arXiv |
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