Star-UBB Seminar Series:- Hearts of Darkness- Theory and Phenomenology of quantum gravity regularised black holes
Black holes are the purest expression of gravity and at the same time the places where our best theory of gravitation, Einstein’s General Relativity, meets its demise in the form of singularities. We expect that any successful theory of quantum gravity should however be able to regularise these uncharted regions leaving an interior that can be modelled via a smooth spacetime. The question is then if this can be done without any modification showing outside the trapping horizon of these objects. In this talk the speaker will describe how a quantum gravity agnostic approach can go a big length in predicting possible regular outcomes of a regularised gravitational collapse. Remarkably, all of the viable spacetime we shall encounter sport an interesting phenomenology suggesting a quite limited set of possible long living objects. We shall see that connecting these insights with current observations hold promise for distinguishing these regular spacetimes from the singular General Relativity black holes, and so heralding the advent of a new branch of quantum gravity phenomenology.
頻道：Zoom ID:853-7454-4159 ←
講者：Prof. Stefano Liberati (SISSA, and INFN Sezione di Trieste, Trieste, Italy)
Scientific and Technological Advanced Research- Babeș-Bolyai University(Star-UBB) Seminar Series in Gravitation, Cosmology and Astrophysics
Presently a period of rapid and intense change are being witnessed in our understanding of the gravitational force, at a rate that is quickly increasing since the important observational discoveries of the late 1990s. With the advent of new observational techniques, the emergence of important cosmological and astrophysical paradigms can be seen that lead to a deep change in our understanding of the Universe. Astronomical observations strongly suggest that at large scales the force of gravity may not behave according to standard general relativity, and that a generalization of the gravitational action, either at the geometric level, or at the matter level, may be required for a full understanding of the gravitational interaction.
The goal of the present seminar is to bring Theoretical Gravitational Physics closer to the observations and experiments, and to discuss current topics in general relativity, high-energy physics, astrophysics and cosmology.