****************  NCTS/CTC/NTHU HEP Seminar ****************

Speaker: Dr. Tae Hyun Jung (KIAS)
Title: Primordial black hole formations in first-order phase transitions.
Time: 12:30-13:30, Thursday, 2022/11/24
Place : R019, Physics Building, Nat'l Tsing Hua Univ.
Host :Prof. Po-Chung Chen (NTHU)

Abstract:

Various new physics models can be tested via primordial black hole searches as well as the primordial black hole itself is a good dark matter candidate. In this talk, I will focus on the mechanism where primordial black holes are formed by bubble collisions. For this mechanism to work, symmetry-breaking bubbles need to be larger than the Hubble radius 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. It will be shown that various PBH searches already rule out a part of the effective parameter space of first-order phase transitions, and another part can result in PBHs to be the whole dark matter.

Online link: https://cern.zoom.us/j/68742084566?pwd=dHRxaTB3RThGc2dMaDA1dDhJOHdXQT09

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If you will attend the seminar and would like to have a lunchbox on that day, please register for it online by 10:00AM  Nov. 23rd (Wednesday morning). Late registration will not be accepted.
Link for the online registration: https://forms.gle/Y4XNGARLXTwRCqw86
*Note:
1. The lunchboxes will only be prepared for the participation of professors and postdoctoral researchers. Please sign up for your attendance and receive your lunchbox at the lobby of NCTS on 5F between 11:40AM - 12:00PM on Nov. 24th.
2. In order to prevent the potential spread of COVID-19, we suggest that you bring your own face mask and wear it while attending the seminar.