Bootstrapping inflation: A new perspective towards cosmological correlators
报告人（单位）
Dr. Dong-Gang Wang（University of Cambridge, UK）
报告时间
2022年6月8日（周三）21:00
直播二维码
报告人介绍
Dong-Gang Wang was a master student in USTC from 2013 to 2016. After that, he moved to Leiden University in the Netherlands for PhD as a de Sitter Fellow from 2016 to 2020. Now he is a postdoctoral researcher as a Rubicon Fellow at the Department of Applied Mathematics and Theoretical Physics in the University of Cambridge, UK. His research mainly focuses on the primordial cosmology. In particular he is interested in dissecting non-Gaussian statistics of primordial fluctuations by using the effective field theory and bootstrap approaches.
报告摘要
Correlation functions of primordial fluctuations provide us an exciting avenue into the physics with extremely high energy in the very early Universe. Recently the bootstrap approach has offered new perspectives and powerful tools to study these cosmological correlators. In this talk, I will first briefly review this subject. Then, by incorporating the latest developments, I will “bootstrap” two types of inflationary correlators, which are most relevant for the next-generation observations. The first one is the contact correlators arising from large self-interactions of the inflaton. The second is the cosmological collider bispectra from the massive exchange diagrams with all possible boost-breaking interactions. Applying the bootstrap approach, we derive for the first time not only a complete set of these correlators systematically, but also their full shape information analytically. Since the de Sitter boost symmetries are broken in our consideration, the sizes of signals are boosted to be detectable for near-future experiments. We identify new features in these non-Gaussianity shapes, which provide interesting targets for the data analysis of upcoming surveys.