Proper actions and supported-section-valued cohomology
Abstract
Consider a proper action of on a smooth (perhaps non-paracompact) manifold . The cohomology valued in the space of compactly-supported sections of a natural sheaf on (such as those of smooth function germs, smooth -form germs, etc.) vanishes for (the cohomological dimension of ) and, at , equals the space of compactly-supported sections of the descent (-invariant push-forward) to the orbifold quotient . We prove this and analogous results on cohomology valued in -supported sections of an equivariant appropriately soft sheaf in a broader context of -actions proper with respect to a paracompactifying family of supports , in the sense that every member of has a neighborhood small with respect to the action in Palais' sense.
Keywords
Cite
@article{arxiv.2411.09857,
title = {Proper actions and supported-section-valued cohomology},
author = {Alexandru Chirvasitu},
journal= {arXiv preprint arXiv:2411.09857},
year = {2024}
}
Comments
20 pages + references