
arXiv: 2309.06215
We prove that if a compact n -manifold admits a sequence of residual covers that form a coboundary expander in dimension n-2 , then the manifold has Gromov-hyperbolic fundamental group. In particular, residual sequences of covers of non-hyperbolic compact connected irreducible 3-manifolds are not 1-coboundary expanders.
Mathematics - Geometric Topology, FOS: Mathematics, Geometric Topology (math.GT), Group Theory (math.GR), Mathematics - Group Theory
Mathematics - Geometric Topology, FOS: Mathematics, Geometric Topology (math.GT), Group Theory (math.GR), Mathematics - Group Theory
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