题目：Big Bounce Genesis

报告人：南京大学物理学院 张若筠教授 李昌鸿博士

时间：2014年11月3日(星期一）  下午3:00-5:00

地点：管理科研楼1418

摘要: We will introduce our big bounce cosmos of Coupled Scalar Tachyon fields. We  consider  the possibility of using dark matter particle's mass and its interaction cross section as a smoking gun signal of the existence of a Big Bounce at the early stage in the evolution of our currently observed universe.   A study of dark matter production in the pre-bounce contraction and the post bounce expansion epochs of this universe reveals a new venuefor achieving the observed relic abundance of our present universe.Specifically, it predicts a characteristic relation governing a dark matter mass and interaction cross section and  a factor of $1/2$ in thermally averaged cross section, as compared to the non-thermal production in standard cosmology, is needed for creating enough dark matter particle to satisfy the currently observed relic abundance because  dark matter is being created during the pre-bounce contraction, in addition to the post-bounce expansion.As the production rate is lower than the Hubble expansion rate  information of the bounce universe evolution is preserved. Therefore once  the value of dark matter mass and interaction cross section are obtained by direct detection in laboratories, this alternative route becomes a signature prediction of the bounce universe scenario.

主办单位：365英国上市官网  
          中科院吴文俊数学重点实验室

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