TITLE : Superradiant scattering of a massive scalar field due to a magnetically charged rotating black hole

ABSTRACT :

Rotating black holes are well-known for amplifying perturbing
bosonic fields within specific parameter ranges, a phenomenon commonly referred
to as superradiance. Besides spacetime rotation, charge also plays a significant
role in amplification. In this presentation, we will explore the superradiant
scattering states of a massive scalar field in the spacetime of a magnetically
charged rotating black hole, arising from the interaction between a nonlinear
electromagnetic field configuration and gravity. We will specifically examine
how the magnetic charge of this spacetime influences the magnitude of amplification
and the allowed frequency ranges for superradiance. Furthermore, the
effective potential for a massive scalar field in the rotating spacetime also leads
to the superradiant bound states. Therefore, our next focus will be on the superradiant
instability regime for the magnetically charged black hole due to the
massive potential barrier. Along the talk, we will compare the results for this
magnetically charged black hole with the electrically charged Kerr-Newmann
black hole. Finally, we will end with the conclusion and the future outlook.

ABOUT THE SPEAKER :

MEETING DETAILS :

Joining Link: events.php

Speaker: Mr. Rajesh Karmakar (IIT Guwahati)

Venue: A1-NKN, South Campus

Date and Time: Friday, 13 September 2024