Online Seminar〝On the quasi-stationary expansion in gravity〞

Star-UBB Seminar Series:- On the quasi-stationary expansion in gravity

After shortly commenting and reviewing the quasi stationary (or adiabatic) approximation/expansion in general, the speaker will discuss some recent applications of it to General Relativity(GR). First he will discuss how in the setting of GR inside a finite spatial volume, the Einstein equations in the quasi-stationary limit can be re-expressed as geodesic equations on the (infinite dimensional) group of boundary diffeomorphisms. Secondly he will explain how the quasi stationary expansion is related to the strong field non relativistic expansion of GR (also referred to as the 1/c expansion). Finally he will mention some work in progress where the quasi-stationary expansion is used concretely to find a (approximate) solution for a time dependent (i.e. dynamic) black hole in an evolving de Sitter background.

時間:2023.06.08(四) 16:00~17:00
頻道:Zoom ID:853-7454-4159 ←
講者:Dieter Van den Bleeken (Physics Department, Boğaziçi University, Bebek, Istanbul, Turkey)


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.


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