Abstract
Primordial perturbations observed on the CMB are thought to come from cosmological correlators during inflation. While massive (spinning) fields lead to vanishing correlators, their interaction with massless ones can alter the massless field correlators. These changes can be used to infer existence of massive spinning fields during inflation. The speaker will compare two main models of massive spinning fields during inflation, and discuss the similarities and differences of their cosmological signatures. A good part of the talk will also be dedicated to the accurate Feynman rules for computing these correlators, which have not been properly explored in the literature.
Mr. Trevor Cheung is a second-year PhD student at the University of Nottingham under the supervision of Dr. David Stefanyszyn. He completed his Bachelor of Arts (2019-2022) with Master of Mathematics (2022-2023) at the University of Cambridge with the support of the Prince Philip Scholarship. His research interests include cosmological correlators and quantum field theory in curved spacetime.
For more information regarding this program, please visit https://ias.hkust.edu.hk/events/cosmological-correlators-with-massive-spinning-fields.