Primordial non-Gaussianities record interactions of elds in the early universe, which can be viewed as collision events in a "Cosmological Collider" with huge energy. In this talk, I shall introduce the workings of the Cosmological Collider as an explorer of new physics at very high scales, and describe the Standard Model spectrum during in ation and its "background signals" in Cosmological Collider. The nontrivial quantum correction during in ation plays a crucial role in this process, which I shall describe in detail.

Zhong-Zhi Xianyu is currently postdoctoral fellow at Harvard University. He received his Ph. D in physics from Center for High Energy Physics at Tsinghua University, in 2015. His research interest covers several aspects of theoretical particle physics and cosmology, including in ation theory, primordial non-Gaussianities, gravitational waves, etc.