【直播】【“早期宇宙与阿里原初引力波探测实验”线上论坛】Prof. Nicolas Bernal 学术报告

直播信息

报告题目

Dark Matter in the Time of Primordial Black Holes

报告人

Prof. Nicolas Bernal

（Universidad Antonio Nariño in Bogotá, Colombia）

报告时间

2022年6月29日（周三）15:00

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报告人介绍

Dr. Nicolás Bernal received his Ph.D. from Paris-Saclay University in 2008. After postdoctoral appointments at the University of Barcelona, Lisboa University, Bonn University, and ICTP-SAIFR, he joined Universidad Antonio Nariño in Bogotá, Colombia, as an associate professor. His research interests are dark matter, beyond standard model phenomenology, and particle cosmology.

报告摘要

Rotating black holes (BHs) can efficiently transfer energy to the surrounding environment via superradiance. In particular, when the Compton length of a particle is comparable to the gravitational radius of a BH, the particle’s occupation number can be exponentially amplified. In this work, we investigate the effect of the primordial-black-hole (PBH) superradiant instabilities on the generation of heavy bosonic dark matter (DM) with a mass above ∼ 1 TeV. Additionally, we analyze its interplay with other purely gravitational and therefore unavoidable DM production mechanisms such as Hawking emission and the ultraviolet freeze-in. We find that superradiance can significantly increase the DM density produced by PBHs with respect to the case that only considers Hawking emission, and hence lower initial PBH densities are required.

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