Yakov Shlapentokh-Rothman: Princeton University & Roberto Emperan: Universitat de Barcelona


Tuesday, April 9, 2019, 1:00pm to 3:00pm


BHI conference Room: 20 Garden Street, Cambridge (Lunch will be served at 1:00 pm)

Yakov Shlapentokh-Rothman: Princeton University

Title: Superradiant Instabilities for Massive Scalar Fields on Kerr Black Hole Backgrounds

Abstract: Superradiance refers to the possibility of energy extraction from a rotating black. We will discuss how this phenomenon leads to instabilities in the propagation of massive scalar fields.

Roberto Emperan: Universitat de Barcelona

Title: “Cosmic censorship violations: mostly harmless”

Abstract: The cosmic censorship (CC) conjecture raises the question of whether classical gravitational dynamics can drive a low-energy configuration into an accessible regime of quantum gravity, with Planck-scale curvatures and energy densities visible by distant observers. I will discuss convincing evidence of processes that evolve towards CC violations, but then argue that these are mostly harmless. Even if CC is violated, its spirit remains unchallenged: classical relativity describes the physics seen by observers outside the black holes accurately, with only minimal quantum input that does not entail macroscopic disruptions. This invites speculation about possible connections between cosmic censorship and other basic physics principles.

See also: Astronomy, Math, Physics