Some applications of l_p-cohomology to boundaries of Gromov hyperbolic spaces

Details Some applications of l_p-cohomology to boundaries of Gromov hyperbolic spaces Some applications of l_p-cohomology to boundaries of Gromov hyperbolic spaces

2012-03-06

arxiv.org/abs/1203.1233v1

Mathematics

Group Theory

Scientific paper

We study quasi-isometry invariants of Gromov hyperbolic spaces, focussing on the l_p-cohomology and closely related invariants such as the conformal dimension, combinatorial modulus, and the Combinatorial Loewner Property. We give new constructions of continuous l_p-cohomology, thereby obtaining information about the l_p-equivalence relation, as well as critical exponents associated with l_p-cohomology. As an application, we provide a flexible construction of hyperbolic groups which do not have the Combinatorial Loewner Property, extending and complementing earlier examples. Another consequence is the existence of hyperbolic groups with Sierpinski carpet boundary which have conformal dimension arbitrarily close to 1. In particular, we answer questions of Mario Bonk and John Mackay.

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