ELFT HÍRADÓ

[Balog Janos <balog.janos AT wigner.mta.hu>]

MTA Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


                   Haryanto Siahaan
                     (Wigner RMI)

         "Some Aspects of Magnetized Black Holes"


             címmel tartandó szemináriumára.

Kivonat:

In the last couple of years, there has been a growing interest in the 
studies of black holes interacting with external magnetic fields. One of 
the reasons is that astronomers found some evidence of strong magnetic 
fields in the centers of galaxies, where normally supermassive black 
holes sit. When the external magnetic field cannot be treated as some 
perturbations, the exact solutions by Ernst in Einstein-Maxwell theory 
can be employed to model a magnetized black hole. The solution is 
obtained by applying a Harrison-like transformation to a known 
unmagnetized one, which is also in the Einstein-Maxwell theory. However, 
the resulting magnetized spacetime has no asymptotic flatness anymore.

Nevertheless, some interesting questions can still be addressed to the 
magnetized black holes in Einstein-Maxwell theory, which will be 
discussed in this talk. One of the questions is whether the conjectured 
Kerr/CFT correspondence still holds in the case of rotating black holes 
immersed in a strong magnetic field. The Kerr/CFT correspondence states 
that the physics of four dimensional rotating black holes is dual to a 
two dimensional conformal field theory (2d CFT). Some evidences in 
supporting this conjecture are the ability of entropy and scattering 
formulas in 2d CFT to recover the Bekenstein-Hawking entropy and 
scattering process calculation in the black hole background. Another 
question is about the possibility of destroying a magnetized black hole 
by using a test particle. It can be shown that a near extremal black 
hole can be turned into a naked singularity if the black hole captures a 
classical test particle released from far away. One may wonder how the 
presence of external magnetic field may contribute to the possibility of 
destroying a black hole immersed in this field.


Helye: MTA Wigner FK RMI III.ép. Tanácsterem
Ideje: 2017 október 6  péntek du. 14:00 óra



Szívesen látunk minden érdeklődőt.

                                            Balog János