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PKU HEP Seminar and Workshop (北京大学高能物理组)

Recent progress in cosmological collider physics

by Prof. Zhong-Zhi Xian Yu (Tsinghua U.)



Heavy particles can be produced on shell during inflation and leave distinct signals in the correlations of density fluctuations. In this talk I will introduce the basics of this cosmological collider program, and explain why it is nontrivial to get visibly large signals. I will then describe some recent works along this direction with fun physics and naturally large signals, including seeing heavy neutrinos, probing CP violations, and a scenario of Cosmological Higgs Collider where the Higgs interactions can be directly seen via modulated reheating. Short 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. Online Tencent/VOOV meeting: https://meeting.tencent.com/s/XwT5GZRUaVZi 会议 ID:910 751 372