Quantum Gravity Unit visitor seminar.
Speaker: Dr. Marco Michel, Ben-Gurion University of the Negev .
Title: Quantum Informational Analogue Models of Black Holes: What Happens After Half Evaporation?

Abstract:

Hawking's calculation of black hole decay in the form of Hawking radiation is based on the semi-classical limit of a fixed metric. Since this approximation may break down once the mass decreases significantly, we shall argue that the fate of a black hole after half evaporation is an open question. 

To shed more light on this, we implement quantum informational properties of black holes such as their Bekenstein-Hawking entropy in simple condensed matter analogue systems. 

In these prototypes we investigate a universal mechanism underlying the microscopic origin of the enhanced microstate entropy. Furthermore, we argue that such systems are 

subjected to a universal effect, which ties them to a critical state and suppresses their decay. Applied to black hole physics, a numerical 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.