51 citations · 187 across the 19 of their papers we have counts for
23 papers
Reflections on branched covers
Grigori Avramidi, Boris Okun, Kevin Schreve
A flag complex determines a locally CAT(0) cube complex with the links of all vertices isomorphic to . The fundamental group of is the commutator subgroup of the…
L^2-Betti numbers of branched covers of hyperbolic manifolds
Grigori Avramidi, Boris Okun, Kevin Schreve
We show that Gromov-Thurston branched covers satisfy the Singer conjecture whenever the degree of the cover is not divisible by a finite set of primes determined by the base manifo…
Edge subdivisions and the -homology of right-angled Coxeter groups
Grigori Avramidi, Boris Okun, Kevin Schreve
If is a flag triangulation of , then the Davis complex for the associated right-angled Coxeter group is a contractible -manifold. A special case of a co…
Orders and Fibering
Boris Okun, Kevin Schreve
In 2018, Kielak gave a virtual fibering criterion for RFRS groups. In this paper, we present a simpler proof of this.
Coarse cohomology of the complement
Arka Banerjee, Boris Okun
In this paper we define the coarse (co)homology of the complement of a subspace in a metric space, generalizing the coarse (co)homology of Roe. We give a model space which encodes…
Homology growth, hyperbolization, and fibering
Grigori Avramidi, Boris Okun, Kevin Schreve
We introduce a hyperbolic reflection group trick which builds closed aspherical manifolds out of compact ones and preserves hyperbolicity, residual finiteness, and -- for almost al…