Special Seminars for Dr. Sanghyeon Chang

Wednesday 10 Sept 2025, 15:00 → 16:30 Asia/Seoul

With Gratitude for Dr. Sanghyeon Chang's Dedication to CTPU !

Photo Album (today)  
Photon Album (a history of CTPU through Sanghyeon's lens)

 

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15:00 → 15:30 Amaterasu particle and the puzzles of ultra-high energy cosmic rays

Ultra-high cosmic rays are the most energetic particles incident on Earth from outer space. It is one of the mysteries of science where and how these particles are produced. In this talk, I'll review the basics, the latest observations and the current issues of ultra-high cosmic rays.

Speaker: Prof. Hang Bae Kim (Hanyang University)

Amaterasu particle and the puzzles of UHECR (20250910, IBS-CTPU).pdf

15:30 → 16:00 Anthropic Principle

I will review the anthropic principle in science at a very basic level on the occasion of Dr. Sanghyeon Chang's retirement.

Speaker: Prof. Chanju Kim (Ehwa Womans University)

장상현은퇴20250910.pdf

16:00 → 16:30 Landau-Zener production of heavy sterile neutrino dark matter

We suggest a production mechanism of sterile neutrino dark matter whose interaction with a thermal bath is feebler than required by the freeze-in mechanism. It relies on the non-adiabatic transition in the process of the resonant conversion of thermal particles to the dark matter state, which can occur at a temperature much higher than the dark matter mass. This can be accomplished for a wide range of the sterile neutrino masses, from keV to TeV, with a judicious choice of their self-interacting couplings

Speaker: Eung Jin Chun (KIAS)