Daniela Doneva ( Eberhard-Karls-Universitat Tuebingen)

Even though the Kerr black hole fits very well in the

interpretation of various astrophysical observations, there is a

number of yet untested modifications of general relativity that can

endow it with hair. The rapid advance of observational astrophysics

gives us the unique opportunity to test the existence of beyond-Kerr

black holes and eventually to constraint the strong-field regime of

gravity. A particular widely studied case is a Kerr-like black hole

endowed with scalar hair that can form for example in the presence of

time-varying complex scalar field or in the more general context of

tensor-multi-scalar theories. We will discuss these solutions and

their astrophysical manifestations. We will put a special emphasis on

the accretion discs around such objects that can have fundamentally

different properties compared to pure GR.

Zoom Meeting ID: 854 3210 3337

Passcode: 959078