2024-11-20 (Wednesday) 3:00 PM CST [Webinar]
Title:
Inflationary and Gravitational Wave Signatures of Small Primordial Black Holes as Dark Matter
Speaker:
Dr. Sebastian Zell
Institutions:
Ludwig Maximilian University of Munich
Short-bio:
Dr. Sebastian Zell completed his graduate studies at the Max Planck Institute for Physics and Ludwig Maximilian University of Munich, where he earned his PhD in 2019 under the supervision of Gia Dvali. Subsequently, he went on to work at École Polytechnique Fédérale de Lausanne and at UCLouvain, before taking up his current postdoc position at Ludwig Maximilian University of Munich. His research is based at the interface of particle physics and cosmology, with topics ranging from gravity, inflation, black holes and dark matter to axions, quantum information and the mass scales of Nature.
Abstract:
First reviewing black hole evaporation, I will discuss that the semi-classical calculation of particle production is expected to break down at the latest once half of the mass is lost. Quantum analogue systems, which imitate important properties of a black hole such as its entropy, provide strong indications for a drastic slowdown of evaporation. Therefore, small primordial black holes (PBHs) can both become viable dark matter candidates and provide a unique window on quantum gravity. Finally, I will turn to the inflationary production of small PBHs. A sufficiently small mass alleviates any tension with CMB observations and scalar-induced gravitational waves (GW) can yield an observable signal. I will highlight the need to develop new experiments for high-frequency GW detection in the kHz to MHz range.
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