12:00–1:00 pm ERC 401
Host: Hayden Lee
Chia-Hsien Shen (UC San Diego) "Particle Physics Tools for the Sky"
Research in particle physics usually focuses on fundamental symmetries and elevating the precision of theoretical predictions. In this talk, I will show that modern tools developed for particle physics can also be applied to physics in the sky. I will introduce the notions of scattering amplitudes and effective field theory. Using gravitational waves (GW) as a primary example, we will see that applying these tools leads to state-of-the-art theoretical precision in Einstein gravity. In the second half of the talk, I will discuss classical angular momentum in electromagnetism and gravity. Surprisingly, this basic quantity has several counter-intuitive features, which I will clarify. I will also show the importance of angular momentum and dissipative effects in GW physics.
About speaker: Chia-Hsien is an expert on scattering amplitudes, double-copy relations, effective field theories and how to apply these ideas to state-of-the-art gravitational-wave calculations.