Bootstrapping Inflationary Physics

Our understanding of the primordial Universe largely depends on the information from spatial correlations of cosmic-scale matter distributions. Recently, the advances of the “cosmological bootstrap” program offers new perspectives and powerful tools to study these cosmological correlators. This talk will review some of the exciting developments along this direction, with a focus on the phenomenology and observation frontiers. I will first systematically classify the primary observational target — primordial non-Gaussianities (bispectrum) from cosmic inflation, incorporating three leading scenarios: single field inflation, cosmological colliders and multi-field inflation. Then, I will introduce some recent efforts to bootstrap graviton non-Gaussianities and construct a new EFT of spinning fields. In the end, I will present an up-to-date data analysis of the new predictions using the latest CMB data from Planck satellite. Via both CMB-BEST and Modal pipelines, we identify the most significant signal of cosmological collider in the current observation.