NPAC (Nuclear/Particle/Astro/Cosmo) Forums |
Organized by: Prof. Lu Lu
Events During the Week of October 23rd through October 30th, 2022
Monday, October 24th, 2022
- No events scheduled
Tuesday, October 25th, 2022
- No events scheduled
Wednesday, October 26th, 2022
- No events scheduled
Thursday, October 27th, 2022
- No events scheduled
Friday, October 28th, 2022
- Powerful Indirect Constraints on the Origins of Ultra High Energy Cosmic Rays
- Time: 2:00 pm - 3:00 pm
- Place: CH 4274
- Speaker: Glennys Farrar, NYU
- Abstract: As is now painfully evident, finding the sources of UHECRs is very challenging due to the combination of most UHECRs having intermediate masses, the poor precision in individual UHECR charge assignments, and generally large deflections in the imperfectly-known Galactic magnetic field. These effects not only smear the images of individual UHECR sources but also lead to a non-trivial and poorly-constrained mapping between a source's direction and the arrival direction distribution of its UHECRs. In the face of this challenge, indirect information on the sources which is imprinted on the spectrum and composition of UHECRs as they emerge from the source surroundings and on the neutrinos they produce, provides valuable additional information on the nature of the sources. This talk will discuss the resulting constraints on the physical properties of the environment surrounding the source, and a possible picture that emerges when also considering evidence on the number density and diversity of source types.
- Host: Lu Lu