2025/09/11 by Md. Abhishek, Abhishek, Md., Charlotte Sleight +3 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #hep-th
paper · pdf · doi:10.48550/arxiv.2509.09536
39 pages + appendices. v3: Clarifications added, typos corrected
arxiv created 2026/07/31 · arxiv updated 2026/08/03
In this work we examine in more detail the map between late-time correlators in de Sitter space and boundary correlators in Euclidean anti-de Sitter space, elaborating on the general construction presented in arXiv:2007.09993 and arXiv:2109.02725 for EFTs of bosonic spinning fields. This map may be phrased as an equivalence between the generating functional of late-time correlators in the Schwinger--Keldysh formalism and the generating functional for boundary correlators in the corresponding EAdS theory. We extend the construction to gauge bosons and gravitons, and clarify additional subtleties that appear in even boundary dimensions. We give the resulting EAdS Feynman rules for scalar QED, pure Yang--Mills theory and Einstein gravity in dS space, illustrating them with contact and tree-level exchange diagrams. The sinusoidal factors relating dS and EAdS diagrams lead to selection rules for late-time falloffs, with possible residual local terms only in IR-divergent cases. Finally, we emphasise that the relation between dS and EAdS propagators is manifest in Mellin space, and we provide new expressions for gauge-boson and graviton propagators in axial/temporal gauge, including their longitudinal components. These results provide a practical framework for studying cosmological correlators involving gauge fields and gravitons.