3 December 2020

Mathematical and Theoretical Physics Seminar

Location: Jacobs University Bremen - Online
When: 3.12.2020, 13:00  CET

Speaker: Betti Hartmann (USP, Brazil & Uni Oldenburg & Jacobs University Bremen)
Title: Scalar field stars and black holes with scalar hair

Abstract: With direct gravitational wave detections as well as the first
picture of the shadow of a black hole, there exists now complementary
observational evidence that black holes - a priori a theoretical
prediction of the best theory of gravity that we have to this day,
General Relativity - do, indeed, (seem to) exist in the universe. These
recent observations show that the corresponding black holes can be
extremely well matched to the Kerr solution, a vacuum solution of the
Einstein equation that describes a black hole determined only by its
mass and angular momentum. Observable black holes hence seem to be very
simple objects that carry no additional structure ("hair"). However,
models appearing in theories that try to explain e.g. the nature of dark
energy or the inflationary epoch in the primordial universe as well as
recent studies within the gauge/gravity duality contain black hole
solutions that often carry hair. Moreover, stars made out of scalar
fields - so-called "boson stars" - provide viable alternatives to
supermassive black holes.
In this talk, I will discuss boson stars and black holes that carry
non-trivial scalar hair, respectively. I will motivate the models
discussed and explain their applications.

More details can be found here.