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Abstract:
Primordial black holes (PBHs) are hypothetical objects that formed in the early Universe which can have various interesting phenomenology. The mass range of PBHs can be much larger than those of astrophysical origins, especially covering masses much smaller than the solar mass. Extremely small PBHs are expected to experience significant Hawking evaporation such that they cannot survive until today. In this talk, we focus on the PBHs with masses smaller than 10^9 g that would have completely evaporated before the Big Bang nucleosynthesis (BBN). We discuss the thermalization process of the high-energy particles from Hawking radiation inside the ambient plasma and show how such process heats up the plasma to form a fire ball around such a PBH with radius much larger than the PBH itself. We will briefly discuss the potential phenomenological consequences from such fire balls.
Biography:
Dr. Minxi He received his PhD at the University of Tokyo in 2021, after which he started working at KEK as a postdoc researcher.
Online Meeting Room: https://meeting.tencent.com/dm/GrfH7hsPKRje
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