7-11 September 2015
Warsaw, Poland
Europe/Zurich timezone

Dark-Matter Bound States from Feynman Diagrams

8 Sep 2015, 17:10
20m
Rm 207 ()

Rm 207

Speaker

Marieke Postma (Nikhef, Netherlands)

Description

If dark matter couples directly to a light force mediator, then it may form bound states in the early universe and in the non-relativistic environment of haloes today. In this talk I will present a field-theoretic framework for the computation of bound-state formation cross-sections, de-excitation and decay rates, in theories with long-range interactions. At low relative velocities of the interacting particles, the formation of bound states is enhanced by the Sommerfeld effect. For scalar particle-antiparticle pairs, we show that bound-state formation can be faster than annihilation into radiation in the regime where the Sommerfeld effect is important.

Presentation Materials