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THCA Seminar: Exploring bouncing cosmologies with observations

Friday,14:00, Jul.4, 2014. Lecture Hall,third floor,New Science Building(理科楼) Title: Exploring bouncing cosmologies with observations Speaker: Cai Yifu (McGill University, Canada) Abstract: Recently, it was claimed that the primordial CMB B-mode polarization was detected by the BICEP2 collaboration. If these signals were all from primordial origin, models of early universe cosmology would be tightly constrained by cosmological observations. I will talk about observational implications on bouncing cosmologies from the combined Planck and BICEP2 experiments. In particular I will focus on three representative bounce models in the frame of matter bounce cosmology. If our universe experienced a bounce, today's observations favor a bounce model which occurs pretty slowly at an energy scale near the GUT scale.