Theory Colloquia

Theoretical issues in calculating the relic abundance of dark matter particles

by Motohiko YOSHIMURA (Tohoku University)

TH Auditorium (CERN)

TH Auditorium


The Boltzmann equation approach to estimate the relic abundance of dark matter particles is critically re-examined, and a new approach based on a fully quantum mechanical treatment of WIMP and thermal environment interaction is developed. The outcoming result shows that when the heavy WIMP decays in a very non-relativistic speed, the abundance is given by a power of temperature in contrast to the usual Boltzmann suppressed exponential. This has a great impact on the SUSY dark matter parameters.