Speaker
Description
It is widely believed that during inflation heavy particles (m ~ H up to 10^13 GeV) could be produced and they could leave imprints on large cosmic scales. This mechanism provides a unique window to explore physics at extremely high energy scales--a paradigm known as cosmological collider (CC) physics. The central observables in CC physics are correlation functions (inflation correlators) with massive intermediate states, which are difficult to compute due to many technical challenges. In recent work, we proposed a novel approach to bootstrap inflation correlators from an on-shell perspective. The framework allows us to extract the full analytic expressions of inflation correlators solely from their on-shell part (the oscillating signals phenomenologically), thus drastically simplifying the computation process. By applying our approach to several one-loop correlators, we obtained new analytical expressions that are much simpler than existing results.