| 8:00am |
|
| 9:00am |
|
| 10:00am |
|
| 11:00am |
|
| 12:00pm |
|
| 1:00pm |
|
| 2:00pm |
|
| 3:00pm |
[3:00pm]Joint Particle Seminar: Haibo Yu (UCI)
- Description:
- Speaker: Haibo Yu (UCI)
Title: Halo Shape and Relic Density Exclusions of Sommerfeld-Enhanced Dark Matter Explanations of Cosmic Ray Excesses
Abstract: Dark matter with Sommerfeld-enhanced annihilation has been proposed to explain observed cosmic ray positron excesses in the 10 GeV to TeV energy range. We show that the required enhancement implies thermal relic densities that are too small to be all of dark matter. In addition, we derive upper bounds on possible Sommerfeld enhancements from the observation of elliptical galactic dark matter halos and show that these bounds also generically exclude these explanations. Interestingly, viable models with moderate Sommerfeld enhancements predict that small galactic halos should have observable spherical cores with constant density.
|
| 4:00pm |
|
| 5:00pm |
|
