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FIELD Phys:Particle Physics
DATE April 30 (Tue), 2019
TIME 16:00-17:30
PLACE 1423
SPEAKER Jihyun Kim
HOST Chen, Junmou
INSTITUTE Osaka City University
TITLE Ultra-high-energy cosmic rays and a clue to their origin

Cosmic rays are energetic particles originated from outer space that impinge on the Earth’s atmosphere. Since the first discovery by Victor Hess, the nature and origin of cosmic rays have been studied for more than a century. Still, cosmic rays with energies above 10^18 eV, so-called ultra-high-energy cosmic rays (UHECRs), have many unanswered questions about their origin and nature: What are their components? Where do they come from? How are they accelerated to such high energies? How are they influenced by the cosmic magnetic fields when they propagate in the universe? In this talk, I will give an overview of the astrophysics of UHECRs and introduce the most recent results of the observations. Also, I will present recent work [1] on the investigation into the origin of a high concentration of UHECR events identified by the Telescope Array experiment. I will show a close correlation between those UHECR events and filaments of galaxies connected to the Virgo cluster. It will be discussed the possibility that the magnetized cosmic web of the local universe could be responsible for the high concentration.

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