Weaving Geodesics and New Phenomena in Horocyclic Dynamics

Abstract

We construct geometrically infinite hyperbolic surfaces supporting horocycles with tailored recurrence properties. In particular, we obtain the first examples of non-trivial minimal horocyclic orbit closures and of infinite locally-finite conservative horocyclic invariant measures which are singular with respect to the geodesic flow. Other examples include surfaces supporting horocyclic orbit closures of arbitrary Hausdorff dimension in $(1,2)$.

21 pages, 4 figures, rewritten subsection 1.5 and section 2 for improved readability - results unchanged