Lunch Seminar：Towards a nonsingular bounce without pathologies

时间： 2013年6月26日  11：30-13:00

地点：天体楼三楼会议室

主持人：李虹

报告人 ： 蔡一夫 （加拿大McGill大学）

报告题目： Towards a nonsingular bounce without pathologies

报告摘要：Big Bang cosmology suffers from the problem of initial singularity. To circumvent this problem, bounce cosmology suggests that our universe starts with a contraction and then transits to the expansion at a finite size. In this talk I will briefly review nonsingular bounces based on effective field description and the challenges in the model building. Then I will introduce a specific class of nonsingular bounce models where both the background and perturbation behave very well throughout the evolution. I will talk about the generic properties of cosmological perturbations in bounce cosmology and explain how this type of model can explain the CMB observation consistently.