Abstract
In this talk I will briefly introduce the present understanding about the cosmic acceleration at present from the perspective of phenomenological study. I will review the latest observational status of the late-time cosmic acceleration and then depict how to do the model building of dynamical dark energy. Afterwards, I will also give an introduction to a type of torsional based modified gravity, which can also realize the cosmic acceleration at present. This so-called f(T) gravity and beyond theories can be depicted in a language of effective field theory and thus we can examine certain operators that are most connected with various cosmological observations.
Biography
Yi-Fu Cai is a professor in the department of astronomy at the University of Science and Technology of China (USTC). He did the PhD study at the Institute of High Energy Physics, Chinese Academy of Sciences. He worked as a postdoc scholar at Arizona State University and McGill University until 2015. He was selected into the Chinese National Youth Thousand Talents Program in 2015 and became a faculty at USTC. His particle cosmology group at USTC is responsible for the scientific goals of the AliCPT project associated with cosmological models. His research focuses on fundamental questions for cosmology, namely, the big bang singularity, the origin and destiny of the universe, the cosmological perturbation theory and the CMB theory.
Anyone interested is welcome to attend.