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SS23 – Abstract
Alessia Platania
(Perimeter Institute)
6.7.2023
Quantum black holes: from model building to asymptotic constraints (PRETALK for students at 15:30 h)
Black holes are among the most fascinating objects in our Universe. Whether and how physical black holes deviate from their classical counterpart are outstanding open questions.
In this talk I will argue that combining model building with fundamental principles is a very powerful strategy to constrain quantum black holes and their generating effective action, even in regimes where deviations from General Relativity are tiny and observationally negligible.
I will describe two independent but interrelated realizations of this idea. First, I will show that enforcing the validity of the principle of least action at large distances leads to strong constraints on the asymptotic deviations from the Schwarzschild metric. These bounds, which would rule out famous non-singular black-hole models, can only be avoided by introducing infrared non-localities in the effective action. Second, I will show that the black hole entropy of theories displaying such infrared non-localities diverge, barring miraculous cancellations for special combinations of the interaction couplings.
As a byproduct, these findings highlight how the interplay between black hole physics and internal consistency can yield novel theoretical constraints on the asymptotic modifications of General Relativity.
