Year: 2026
Type: article
Abstract: A bstract Correlators of large-scale fluctuations produced during cosmic inflation are major observables of inflationary cosmology. In cosmological collider physics, many interesting correlators are generated through loop processes. However, ultraviolet divergences often appear when computing the loop correlators, and a regularization is required. In this work, Källén-Lehmann representation and dimensional regularization are used to analytically compute various correlators with a bubble loop of massive bulk propagators in de Sitter spacetime. Examples include 4-point and 2-point correlators with 1-loop bubbe exchanges of derivatively coupled massive scalars or massive spin-1 bosons.
Source: Journal of High Energy Physics
Author: Hongyu Zhang
Institution: Tsinghua University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G4652584675, G5578809208
OpenAlex ID: W7128727558