Structure theorems for the heart of LCA

Oliver Braunling; Fei Ren

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arXiv · 2512.03338

Structure theorems for the heart of LCA

Oliver Braunling·Fei Ren

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Abstract

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.

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BibTeX RIS

Oliver Braunling, Fei Ren. 2025-12-03. Structure theorems for the heart of LCA. https://arxiv.org/abs/2512.03338

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