Title:

Dynamical Dark Matter: A New Framework for  Dark-Matter Physics

Speaker:

Brooks Thomas（Department of Physics University of Hawaii）

Time and place:

12:30, August 24 (Friday), 2012, Lecture  Hall/INPAC (上海交通大学粒子物理宇宙学研究所，包玉刚图书馆东楼四楼(从北门进))

Abstract:

Dynamical  dark matter (DDM) is a new framework for  dark-matter physics in which  the requirement of stability is replaced by a  delicate balancing  between lifetimes and cosmological abundances across a vast  ensemble of  individual dark-matter components whose collective behavior  transcends  that normally associated with traditional dark-matter  candidates. This  absence of stability implies that quantities such as the total   dark-matter relic abundance and the dark-matter equation-of-state  parameter  experience non-trivial time-dependences beyond those  associated with the  expansion of the universe.  In this talk, I provide  an overview of the DDM  framework and provide examples of theoretical  contexts in which DDM ensembles  naturally arise.  I also discuss the  phenomenological implications of DDM  scenarios and, in particular, how  DDM ensembles can potentially be  differentiated from traditional  dark-matter candidates at the next generation of  direct-detection  experiments and at the LHC.