TPPC weekly seminar (in-person): Sebastian Zell - "Black Holes and Quantum Information: What Happens After Half Evaporation?"

Wednesday 7 Dec 2022, 12:30 → 14:00 Europe/London

Strand Building, S7.06

Speaker: Sebastian Zell (EPFL, Lausanne,  Switzerland)

Title: Black Holes and Quantum Information: What Happens After Half Evaporation?

Abstract: Hawking's calculation of particle production by a black hole is based on the semi-classical limit of a fixed metric. Since this approximation may break down once the mass decreases significantly, I shall argue that the fate of a black hole after half evaporation is an open question. In an attempt to answer it, I will subsequently present a simple analogue system, which shares the information-processing properties of a black hole such as its Gibbons-Hawking entropy. An explicit numerical computation of time evolution reveals indications that black hole evaporation slows down drastically at the latest after half of the mass is lost. This opens up a new window for small primordial black holes as viable dark matter candidates.

Based on:

• G. Dvali, L. Eisemann, M. Michel, S. Zell, Black hole metamorphosis and stabilization by memory burden, Phys. Rev. D 102 (2020) 103523, arXiv:2006.00011.
• M. Michel, S. Zell, The Timescales of Quantum Breaking, to appear.

London22_final_short.pdf