Speaker
Prof.
Valerio Faraoni
(Bishop's University)
Description
Numerical studies of gravitational collapse to black holes used to predict gravitational waves make use of apparent horizons, which are intrinsically foliation-dependent. We discuss possible solutions to this problem using the Hawking-Hayward quasilocal mass. In spherical symmetry, a sensible approach consists of restricting to spherical spacetime slicings. Then the apparent horizons enjoy a restricted gauge independence but thermodynamical quantities associated with them are fully gauge-dependent. The widely used comoving and Kodama foliations are of particular interest and are discussed explicitly.
[Based on Phys. Rev. D 95, 024008 (2017)]
Primary author
Prof.
Valerio Faraoni
(Bishop's University)
Co-authors
Prof.
George, F.R. Ellis
(University of Cape Town)
Dr
Javad T. Firouzjaee
(IPM Tehran)
Dr
Alexis Helou
(Ludwig-Maximilians-Universität, Germany)
Dr
Ilia Musco
(Université Paris Diderot, France)
