Structure theorems for the heart of LCA
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911299636559872 |
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| author | Braunling, Oliver Ren, Fei |
| author_facet | Braunling, Oliver Ren, Fei |
| contents | Cohomology theories with values in LCA (locally compact abelian) groups suffer from the problem that the latter do not form an abelian category. However, the category LCA has a canonical abelian category envelope, the heart of a suitable t-structure. It adds formal cokernel objects. We show the surprising result that these abstract cokernels can also be interpreted as Hausdorff topological abelian groups, at least up to lattice isogenies. These need not be locally compact. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_03338 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Structure theorems for the heart of LCA Braunling, Oliver Ren, Fei Category Theory Group Theory K-Theory and Homology Number Theory 22B05, 11R56, 18G80, 22D35 Cohomology theories with values in LCA (locally compact abelian) groups suffer from the problem that the latter do not form an abelian category. However, the category LCA has a canonical abelian category envelope, the heart of a suitable t-structure. It adds formal cokernel objects. We show the surprising result that these abstract cokernels can also be interpreted as Hausdorff topological abelian groups, at least up to lattice isogenies. These need not be locally compact. |
| title | Structure theorems for the heart of LCA |
| topic | Category Theory Group Theory K-Theory and Homology Number Theory 22B05, 11R56, 18G80, 22D35 |
| url | https://arxiv.org/abs/2512.03338 |