English

Compact sheaves on a locally compact space

Algebraic Topology 2026-04-22 v2 K-Theory and Homology

Abstract

We describe the compact objects in the \infty-category of C\mathcal C-valued sheaves Shv(X,C)\text{Shv} (X,\mathcal C) on a hypercomplete locally compact Hausdorff space XX, for C\mathcal C a compactly generated stable \infty-category. When XX is a non-compact connected manifold and C\mathcal C is the unbounded derived category of a ring, our result recovers a result of Neeman. Furthermore, for XX as above and C\mathcal C a nontrivial compactly generated stable \infty-category, we show that Shv(X,C)\text{Shv} (X,\mathcal C) is compactly generated if and only if XX is totally disconnected.

Keywords

Cite

@article{arxiv.2309.12127,
  title  = {Compact sheaves on a locally compact space},
  author = {Oscar Harr},
  journal= {arXiv preprint arXiv:2309.12127},
  year   = {2026}
}

Comments

corrects Lemma 3.2

R2 v1 2026-06-28T12:28:24.940Z