Actions of locally compact groups
The paper "Abstract group actions of locally compact groups on CAT(0) spaces" by Philip Möller and Olga Varghese will be published on the journal Groups, Geometry and Dynamics!
Link to the paper: preprint version
We study abstract group actions of locally compact Hausdorff groups on CAT(0) spaces. Under mild assumptions on the action we show that it is continuous or has a global fixed point. This mirrors results by Dudley and Morris-Nickolas for actions on trees. As a consequence we obtain a geometric proof for the fact that any abstract group homomorphism from a locally compact Hausdorff group into a torsion free CAT(0) group is continuous.