5–9 Dec 2022
Hybrid
Asia/Tokyo timezone

Primordial black hole formation by bubble collisions

7 Dec 2022, 10:00
1h
Lecture Hall, Kavli IPMU (Hybrid )

Lecture Hall, Kavli IPMU

Hybrid

Kavli Institute for the Physics and Mathematics of the Universe The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8583, Japan

Speaker

Dr Tae Hyun Jung (Korea Institute For Advanced Study)

Description

In this talk, I will show that primordial black holes can be formed by bubble collisions if colliding bubbles are super-horizon-sized and not run-away. The PBH abundance can be estimated by counting the number of such collisions of large bubbles for a given first-order phase transition. As a quick example, we use an effective parameters of first-order phase transitions and show that various PBH searches already rule out a part of the reasonable parameter space. In addition, some other choice of parameters can result in PBHs to be the whole dark matter.

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