You are cordially invited to the Colloquium by Prof Gonzalo Olmo, from the Department of Theoretical Physics & IFIC, University of Valencia.
Abstract:
Black holes are one the most impressive predictions of General Relativity but also establish the limits of the theory. The unavoidable existence of singularities and the emergence of event horizons pose critical challenges that call for a deep reformulation of the theory to find a solution. Nonsingular black holes and gravastars (stellar objects supported by the energy and pressure of a cosmological constant) are often presented as alternative compact objects that can solve or alleviate some of these problems. In this talk, I will show that, if vacuum energy is treated as truly empty space (rather than as a cosmological constant), it is also possible to construct a new type of ultracompact stellar object (using the standard Tolman?Oppenheimer?Volkoff (TO V) equations) free of singularities and able to (at least partially) confine photons without the need for horizons. I will describe the structural properties of these objects, discuss aspects of the matching conditions Involved in their construction, and analyse their compactness as well as the behaviour of null geodesics in these geometries.
Join meeting here
Meeting ID: 322 046 825 994 211
Passcode: Fq77Ux6z
For more information, kindly contact Joseph Magwanya.