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Large scale properties of groups; growth functions; Dehn functions; small cancellation properties; hyperbolicity and CAT(0); actions and representations; combinatorial group theory; presentations

4 votes
1 answer
153 views

Are geometric actions on CAT(0) spaces with isolated flats minimal on the boundary?

Suppose $X$ is a $CAT(0)$ space with isolated flats, $\partial X$ its visual boundary and $G$ acts properly discontinuously amd cocompactly on $X$. Must the $G$ action on $\partial X$ have a dense orb …
Ilya Gekhtman's user avatar
7 votes
1 answer
257 views

Uniqueness of stationary measures for $(G,\mu)$ boundaries

Let $G$ be a countable group acting minimally by homeomorphisms on a compact Hausdorff space $X$ and $\mu$ be a probability measure on $G$ whose support generates $G$ as a semigroup. Let $\nu$ is a $\ …
Ilya Gekhtman's user avatar
5 votes
0 answers
152 views

Are there examples of hyperbolic manifolds with finite Bowen-Margulis measure and fundamenta...

It is well known that a geometrically finite hyperbolic manifold (quotient of $H^n$) has finite Bowen-Margulis measure. Marc Peigné [1] constructed examples of geometrically infinite hyperbolic manifo …
Ilya Gekhtman's user avatar