HEP Colloquia 2025

by Dr Ali Akil (University of Hong Kong)

Thursday 20 Nov 2025, 17:00 → 18:00 Europe/Rome

Aula C (Department of Physics)

Black hole radiation from non-vacuum initial states

Black hole radiation is normally derived by comparing the vacuum states before and after the black hole forms. We investigate how non-vacuum initial quantum states impact the black hole radiation. We classify which initial state excitations are distinguishable from one another through measurements on the black hole radiation.We use AQFT to provide a clear physical interpretation of the results, in terms of localised operations and then take a simple concrete example. Our results provide a mechanism for partial information recovery in evaporating black holes, classify what information is recoverable through stimulated emission, and aconcrete understanding of the classification based on the AQFT localisation.