Cohomology and the Bowditch Boundary
Abstract
We give a group cohomological description of the Cech cohomology of the Bowditch boundary of a relatively hyperbolic group pair, generalizing a result of Bestvina-Mess about hyperbolic groups. In case of a relatively hyperbolic Poincar\'e duality group pair, we show the Bowditch boundary is a homology manifold. For a three-dimensional Poincar\'e duality pair, we recover the theorem of Tshishiku-Walsh stating that the boundary is homeomorphic to a two-sphere.
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