Events on Tuesday, September 5th, 2023
- Cookie Potluck
- Time: 2:00 pm - 3:00 pm
- Place: Univ Ave foyer (outside 2241 CH)
- Abstract: We invite the bakers out there to bring a batch of your best to share! If you’re not a baker or don’t have time, just come hang out with us for a bit to have a cookie. For the bakers, it’d be helpful if you can mark anything that has nuts (we’ll assume most baked goods have butter, eggs and flour).
- Host: PGSC (Jarret Rosenberg/Zachary Jerzyk) + UW-Physics (Sharon Kahn)
- NPAC (Nuclear/Particle/Astro/Cosmo) Forum
- 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
- Academic Calendar
- Graduate School Fall 2023: Fall degree window period deadline for master's students
- Time: 4:00 pm - 5:00 pm
- Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu
- Academic Calendar
- Graduate School Fall 2023: Fall degree window period deadline for doctoral students
- Time: 11:55 pm - 12:55 am
- Abstract: Degree candidates must complete all steps: *Important Note: The “Window Period” is the time between the end of one degree period and the beginning of the next. You must have been registered for the previous semester (Fall, Spring, or Summer). If all degree requirements are met by the end of the window period, your degree will be granted for the following semester. However, you will not have to register or pay fees for the next semester. CONTACT: 262-2433, gsacserv@grad.wisc.edu