Online Seminar “Black holes and boson stars with new scalar hair”

Star-UBB Seminar Series:- Black holes and boson stars with new scalar hair

Static, spherically symmetric black holes can carry scalar hair when coupling standard Einstein gravity minimally to a self-interacting complex scalar field and a U(1) gauge field. For this scalar hair to exist, the frequency of the scalar field needs to be fine-tuned. In this talk, the speaker will discuss these solutions and point out that for sufficiently large gravitational coupling, the space-time splits into two distinct parts:
(a) an inflating interior and
(b) an exterior which is described by the extremal Reissner-Nordström solution.
Moreover, for a specific range of parameters, the scalar hair develops spatial oscillations, i.e. black holes can carry so-called wavy scalar hair. She will also comment on the globally regular counterparts of these solutions: charged boson stars.

時間:2023.12.14(四) 17:00~18:00
頻道:Zoom ID:853-7454-4159 ←
講者:Dr. Betti Hartmann (Department of Mathematics, University College London, Gower Street, London, UK)


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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