Dark matter in a bouncing universe
  We investigate a new scenario of dark matter production in a bouncing universe, in which dark matter was produced completely out of equilibrium in the contracting as well as expanding phase. We explore possibilities of using dark matter as a probe of the bouncing universe, focusing on the relationship between a critical temperature of the bouncing universe and the present relic abundance of dark matter. 
Yeuk Kwan E. Cheung, Jin U Kang, Changhong Li
astro-ph.CO gr-qc hep-ph hep-th