Breaking black-hole uniqueness at supermassive scales

by Pedro Fernandes (Southern Denmark U., CP3-Origins)

Wednesday Feb 28, 2024, 2:00 PM → 3:00 PM Europe/Paris

210/1-114 - Salle des Séminaires (IJCLab)

In general relativity, all vacuum black holes are described by the Kerr metric. However, beyond general relativity, there is a prevailing expectation that deviations from the Kerr solution are more likely to manifest with increasing horizon curvature, making solar-mass black holes more promising grounds to test general relativity. In this talk I will challenge this expectation and discuss a model where black holes differ from Kerr only in a finite mass range, bounded from above and below. In particular, black-hole uniqueness can be broken at supermassive black-hole scales, while solar-mass black holes remain well-described by the Kerr solution.