王东刚 博士学术报告
Title: The Cosmological Bootstrap: Theory and Observations
Speaker: Donggang Wang (王东刚)
Affiliation: Cambridge University（剑桥大学）
Time: 15:30-16:30, Monday, 15th July, 2024 (UTC+8, Beijing Time)
Venue: Room 1502, Shing-Tung Yau Center, Yifu Architecture Building, Sipailou Campus of Southeast University, Nanjing
（东南大学四牌楼校区逸夫建筑馆丘成桐中心1502室）
Inviter: Qiang Wen （文强）
Abstract
Our understanding of the primordial Universe largely depends on the information from spatial correlations of matter distributions. Recently, the advances of the cosmological bootstrap program offer new perspectives and powerful tools to study these cosmological correlators. In this talk, I will first review the developments of this exciting new direction. Then I will apply the bootstrap method to systematically classify the leading observational target — primordial non-Gaussianities (bispectrum) from cosmic inflation. For the first time, we derive a complete set of scalar bispectra with analytical shapes and large signals, incorporating three leading scenarios: single field inflation, cosmological collider physics, and multi-field inflation. Remarkably, the bootstrap analysis predict novel phenomenologies, which are testable even in today’s observations. In the end, guided by the theoretical studies, I will present a comprehensive data analysis of these predictions using the latest CMB observation from Planck satellite. As the first attempt, we bridge the gap between theories and observations, and demonstrate how the cosmological bootstrap paves the way towards the discovery of new high energy physics in the very early Universe.
Speaker
Dr. Donggang Wang is currently a Rubicon Postdoctoral Fellow at the University of Cambridge.