Work

From the wavefunction of the Universe to in-in-correlators: a perturbative map to all orders

Year: 2026

Type: article

Abstract: A bstract Both the Wavefunction of the Universe and the Schwinger-Keldysh in-in formalism are central tools for analyzing primordial cosmological observables, such as equal-time correlation functions. While their conceptual equivalence is well established, a systematic and explicit map between their diagrammatic expansions has remained elusive. In this article, I construct such a map by analyzing the relation between the two frameworks at the diagrammatic level. I show that diagrams contributing to correlation functions in the Wavefunction of the Universe approach can be uniquely reorganized into Schwinger-Keldysh diagrams. This correspondence holds to all orders in perturbation theory, including arbitrary numbers of interaction vertices and loops.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep06(2026)179

Author: Gonzalo A. Palma

Institution: University of Chile

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: Fondo Nacional de Desarrollo Científico y Tecnológico

Award: G3377266787