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Organized by: Prof. Lu Lu
Events During the Week of September 3rd through September 10th, 2023
Monday, September 4th, 2023
- No events scheduled
Tuesday, September 5th, 2023
- Hunting the origin of ultrahigh-energy cosmic rays through neutrinos and gamma-rays
- Time: 2:30 pm - 3:30 pm
- Place: WIPAC supernova /
- Speaker: Saikat Das, Yukawa Institute, Kyoto University, Japan
- Abstract: Ultrahigh-energy cosmic rays (UHECRs) are the highest-energy particles observed in the Universe, with their energy spectrum extending beyond a few times 1e20 eV. Their unknown sources can also contribute to the diffuse astrophysical neutrino flux measured by IceCube in the TeV-PeV energy range. By modelling their multi-wavelength energy spectrum, we probe cosmic ray acceleration in high-energy gamma-ray sources such as active galactic nuclei and gamma-ray bursts. In particular, I will discuss models explaining the correlation of a high-energy neutrino event from the direction of the Fermi-LAT gamma-ray blazar TXS 0506+056, and the >10 TeV afterglow emission in GRB 221009A. Using a luminosity-dependent density evolution, I will also present the PeV-EeV diffuse neutrino flux from the entire blazar population. For a generic source distribution, the detection of cosmogenic neutrinos beyond ~0.1 EeV is favourable by upcoming detectors, such as IceCube Gen-2, GRAND and POEMMA, depending on the UHECR mass composition. Lastly, I shall discuss the superheavy dark matter origin of the high-energy cosmic rays, gamma rays, and neutrinos.
- Host: Ke Fang
Wednesday, September 6th, 2023
- No events scheduled
Thursday, September 7th, 2023
- No events scheduled
Friday, September 8th, 2023
- No events scheduled