Twisted conjugacy and quasi-isometric rigidity of irreducible lattices in semisimple Lie groups

Abstract: Let $G$ be a non-compact semisimple Lie group with finite centre and finitely many components. We show that any finitely generated group $\Gamma$ which is quasi-isometric to an irreducible lattice in $G$ has the $R_\infty$-property, namely, that there are infinitely $\phi$-twisted conjugacy classes for every automorphism $\phi$ of $\Gamma$. Also, we show that any lattice in $G$ has the $R_\infty$-property, extending our earlier result for irreducible lattices.