Recent progress in cosmological collider physics

Heavy particles can be produced on shell during inflation and leave distinct signals in the correlations of density fluctuations. These signals can be searched for in the future CMB/LSS/21cm observations. In this talk I will introduce the basics of this cosmological collider program. I will then describe some recent works along this direction with fun physics and visibly large signals, including seeing heavy neutrinos, probing CP violations, missing energies, and a scenario of Cosmological Higgs Collider where the high-energy Higgs interactions can be measured from the primordial non-Gaussianity.

Zhong-Zhi Xianyu (Tsinghua University)
Lijing Shao
Thursday, October 28, 2021 - 3:30PM to Thursday, October 28, 2021 - 4:30PM
bio: Zhong-Zhi Xianyu is currently an assistant professor at Department of Physics, Tsinghua University. He obtained his PhD in 2015 from Tsinghua and was a postdoc at Harvard from 2015 to 2020. He works mainly in theoretical particle physics and cosmology. His recent research interests include inflation, non-Gaussianity, new physics in the early universe, gravitational wave astronomy, etc.