Baryogenesis for WIMPs: A WIMP Miracle for Baryons

Note: 2:00 PM
Speaker: Yanou Cui, University of Maryland

When: April 5, 2013 (Fri), 02:00PM to 03:00PM (add to my calendar)
Location: PRB 595

This event is part of the HET Seminar Series.

Abstract:

The observed dark matter and baryon abundances in our universe have long been addressed with separate mechanisms at separate scales. The “coincidence” of their similar abundances is another intriguing phenomenon that has been addressed with other separate mechanisms. In this talk I will present a robust, unified framework, in which the similar baryon and dark matter cosmic abundances both arise from the physics of weakly interacting massive particles (WIMPs) around weak scale, with the rough quantitative success of the so-called ``WIMP miracle''. In particular the baryon abundance arises from the decay of a meta-stable WIMP after its thermal freezeout at or below the weak scale. Furthermore, I will demonstrate it is natural to embed the general idea into existing theories addressing the origin of masses and related Planck-weak hierarchy problem, such as supersymmetry (SUSY). Concrete models will be presented. As a low scale baryogenesis mechanism, it also has interesting phenomenological implications for the LHC and precision tests, which will also be discussed.