Time-Dependent Evolving Null Horizons of a Dynamical Spacetime
Time-Dependent Evolving Null Horizons of a Dynamical Spacetime
Totally geodesic null hypersurfaces have been widely used in the study of isolated black holes. In this paper, we introduce a new quasilocal notion of a family of totally umbilical null hypersurfaces called evolving null horizons (ENH) of a dynamical spacetime, satisfied under an appropriate energy condition. We focus on …