Title: Cosmological Imprints of Evaporating Primordial Black Holes
Speaker: Dr. Lucien Heurtier Affiliation: King's College London
时间：2025年4月9日(周三), 14:00
地点：物理学院203会议室
邀请人：张永超
Abstract: Light primordial black holes - formed shortly after the end of cosmic inflation - contain crucial information regarding the evolution of the early Universe and its particle physics content. Depending on their masses and spins, primordial black holes can evaporate via Hawking radiation at different times throughout cosmic history, leaving all sorts of imprints that may become measurable soon in cosmological or experimental data. After reviewing general aspects of primordial black hole evaporation in cosmology, I will present recent developments in the field regarding the effect of evaporating PBHs on their environment, as they constantly heat their surroundings locally. I will demonstrate that the existence of such temperature gradients in the plasma around PBHs leads to sizeable modifications of existing bounds on PBHs, highlighting the importance of understanding out-of-equlibrium particle physics around evaporating black holes in the future.
Brief CV: Dr. Heurtier, a Postdoctoral Research Associate at the King's College London in the group of Theoretical Particle Physics & Cosmology. He got his Ph.D. from École Polytechnique, Palaiseau. He was once a postdoc at the Université Libre de Bruxelles, University of Arizona, and Durham University. He is an expert in astroparticle physics, early-Universe cosmology, and gravitation. He is also a dark matter, primordial black holes, cosmic inflation, and gravitational wave enthusiast.