STellar Astrophysics & Relativity research cluster/Physics Department seminar
Cosmological black holes: a story of three solutions of the Einstein equations
Andres Zambrano
Physics Department,
Bishop’s University
Friday, November 9, 2012
1:30 p.m.
Hamilton 301
Does the expansion of the universe affect local objects? We can address this question through the McVittie solution which models a black hole embedded in a Friedmann cosmological background. For the last 40 years most of our theoretical understanding of black holes has come from the study of the 'surface' called the Event Horizon: a region from which nothing can escape. The horizon of the McVittie solution differs from that of the Schwarzschild black hole in that it is a time-evolving horizon, forcing us to abandon the concept of event horizon in favour of apparent horizons. An introduction to the evolving horizons will be presented as well as their physical interpretation. Other topics discussed include trapped surfaces, black hole thermodynamics, and the Hawking area theorem applied to the McVittie horizons.
