專題演講 Seminar

Title

Primordial standard clocks and cosmological collider physics

Speaker

Dr. Xingang Chen (Harvard-Smithsonian Center for Astrophysics)

Abstract

In this talk we will introduce two research programs that aim to comprehend the physics of the primordial universe, leading up to the Big Bang universe. We will do so by studying the properties of primordial density perturbations that seeded the structure of the universe. In the primordial standard clocks program, we demonstrate how a signature of massive fields directly encodes the function a(t), representing the primordial universe's scale factor evolution over time. Such a measurement would provide direct evidence for either the inflation scenario or an alternative theory. In the cosmological collider physics program, we explain how the inflation epoch can function as a high-energy collider, revealing the mass and spin spectrum of massive fields that Hubble energy excited during inflation.

Language

演講語言 (Language): in English

Hosted by

吳建宏 研究員
Ng, Kin-Wang / Research Fellow