‘Grey Galaxy’ as the endpoint of the Kerr-AdS super radiant blackhole

Name: ‘Grey Galaxy’ as the endpoint of the Kerr-AdS super radiant blackhole
Start: 2023-07-05T14:00:00-04:00
End: 2023-07-05T15:00:00-04:00
Location: Jefferson 453

CMSA EVENTS: CMSA GENERAL RELATIVITY SEMINAR

When: July 5, 2023

2:00 pm - 3:00 pm

Where: Jefferson 453

Address: 17 Oxford St, Cambridge, MA 02138, United States

Speaker: Dr. Suman Kundu - Weizmann Institute

Kerr-AdS_{d+1} black holes for d ≥ 3 suffer from classical superradiant instabilities over a range of masses above extremality. We conjecture that these instabilities settle down into Grey Galaxies (GGs). Grey Galaxies are made up of a black hole with critical angular velocity ω = 1 in the ‘centre’ of AdS, surrounded by a large flat disk of thermal bulk gas that revolves around the centre of AdS at the speed of light. We will explain various properties of these GG solutions. We also construct another class of solutions with the same charges; ‘Revolving Black Holes (RBHs)’. RBHs are macroscopically charged SO(d, 2) descendants of AdS-Kerr solutions, and consist of ω = 1 black holes revolving around the centre of AdS at a fixed radial location but in a quantum wave function in the angular directions. RBH solutions are marginally entropically subdominant to GG solutions.