Geometria Complessa e Geometria Differenziale
Geometria Complessa e Geometria Differenziale
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K. Li - C. Loeh - M. Moraschini

Bounded acyclicity and relative simplicial volume

created by moraschini on 14 Feb 2022



Inserted: 14 feb 2022
Last Updated: 14 feb 2022

Year: 2022

ArXiv: 2202.05606 PDF


We provide new vanishing and glueing results for relative simplicial volume, following up on two current themes in bounded cohomology: The passage from amenable groups to boundedly acyclic groups and the use of equivariant topology. More precisely, we consider equivariant nerve pairs and relative classifying spaces for families of subgroups. Typically, we apply this to uniformly boundedly acyclic families of subgroups. Our methods also lead to vanishing results for $\ell^2$-Betti numbers of aspherical CW-pairs with small relative amenable category and to a relative version of a result by Dranishnikov and Rudyak concerning mapping degrees and the inheritance of freeness of fundamental groups.

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