Year: 2024
Type: article
Abstract: A bstract We derive a cutting rule for equal-time in-in correlators including cosmological correlators based on Keldysh r / a basis, which decomposes diagrams into fully retarded functions and cut-propagators consisting of Wightman functions. Our derivation relies only on basic assumptions such as unitarity, locality, and the causal structure of the in-in formalism, and therefore holds for theories with arbitrary particle contents and local interactions at any loop order. As an application, we show that non-local cosmological collider signals arise solely from cut-propagators under the assumption of microcausality. Since the cut-propagators do not contain (anti-)time-ordering theta functions, the conformal time integrals are factorized, simplifying practical calculations.
Source: Journal of High Energy Physics
Authors: Yohei Ema, Kyohei Mukaida
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1897041155, G2595738051, G380733860, G4066435496, EXC 2094: ORIGINS: Vom Ursprung des Universums bis zu den ersten Bausteinen des Lebens, THEORETICAL HIGH ENERGY PHYSICS AT THE UNIVERSITY OF MINNESOTA, 宇宙初期におけるヒッグス場のダイナミクス, G5737963569, G638484911, Programs on Critical Problems in Physics, Astrophysics and Biophysics at the Aspen Center for Physics
OpenAlex ID: W4406076145