报告人：Dr. Edward Wilson-Ewing (Albert-Einstein-Institut Max-Planck-Institut fuer Gravitationsphysik)

时间：2016年4月20日下午4：00

地点：东区理化大楼18层天文台报告厅

报告摘要： High precision observations of the cosmic microwave background provide strong constraints on the dynamics of the early universe and raise the hope that it may be possible to detect quantum gravity effects. In this talk, I will focus on realizations of the ekpyrotic and matter bounce scenarios in loop quantum cosmology. These are alternatives to inflation where scale-invariant perturbations are generated in a contracting background Friedmann space-time which later bounces due to loop quantum cosmology effects. I will also discuss how loop quantum cosmology can affect observational quantities; one such effect is a damping of the amplitude of tensor modes.