Dimensional regularization of bubble diagrams in de Sitter spacetime
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.
Fields of Study & Subjects
Cosmology and Gravitation Theories
Particle physics theoretical and experimental studies
Black Holes and Theoretical Physics
Publication details
- Journal / source
- Journal of High Energy Physics
- Publisher
- Springer Science and Business Media LLC
- Volume
- 2026
- Issue
- 2
- Publication date
- 11 February 2026
- Language
- EN