Abstract: CMB is the earliest information we can get from the universe. An exciting result we get from the CMB observation results is that the scalar fluctuation is adiabatic, which indicates the success of the inflation scenario. But still, there are too many inflation models. Things we can do next step is to characterize features of inflation era. And the purest information we can get from the early time to investigate is the primordial gravitational waves. So, extracting the information of tensor perturbation encoded in CMB data is an interesting work. In this talk, I will briefly introduce the constrain on inflation model with the latest CMB data sets, and if time permits, I will introduce a work about CMB parity asymmetry.

Bio: Dr. Cheng Cheng is a Phd student in ITP, CAS. Her major is numerical cosmology. During her Phd, she is focus on charactering features of the early universe especially the constraint on inflation models and investigating the dark energy models with astronomical results.