| Login |
| Description | Speaker: Kevin Langhoff Title: The Irreducible Axion Background Room: 3024 Host: Luty Abstract: Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age of the Universe. A corollary statement is that the abundance of any particle that can decay into photons over cosmological timescales is constrained to be much smaller than the cold dark-matter density. We show that an irreducible freeze-in contribution to the relic density of axions is in violation of that statement in a large portion of the parameter space. This allows us to set stringent constraints on axions in the mass range 100 eV - 100 MeV. Although I will focus on axions, the argument is more general and can be extended to, for instance, sterile neutrinos. |
| Date | Tue, April 25, 2023 |
| Time | 1:30pm-3:00pm PDT |
| Duration | 1 hour 30 minutes |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Sat, May 6, 2023 8:00pm PDT |
| Send Reminder | Yes - 1 day 4 hour 0 minutes before start |
