Gravitational collapse and formation of universal horizons

Abstract

In this paper, we first generalize the definition of stationary universal horizons to dynamical ones, and then show that (dynamical) universal horizons can be formed from realistic gravitational collapse. This is done by constructing analytical models of a collapsing spherically symmetric star with finite thickness in Einstein-aether theory.

Comments: revtex4, 4 figures. Typos are corrected, and new references are added