The subtle simplicity of cosmological correlators
A bstract We investigate cosmological correlators for conformally coupled ϕ 4 theory in four-dimensional de Sitter space. These in-in correlators differ from scattering amplitudes for massless particles in flat space due to the spacelike structure of future infinity in de Sitter. They also require a regularization which preserves de Sitter-invariance, which makes the flat space limit subtle to define at loop-level. Nevertheless we find that up to two loops, the in-in correlators are structurally simpler than the wave function and have the same transcendentality as flat space amplitudes. Moreover, we show that their loop integrands can be recast in terms of flat space integrands and can be derived from a novel recursion relation.
Authors
- Ivo Sachs (ORCID: https://orcid.org/0000-0003-2526-8655)
- Arthur Lipstein (ORCID: https://orcid.org/0000-0002-0213-186X)
- Chandramouli Chowdhury (ORCID: https://orcid.org/0000-0003-4893-4948)
- Pierre Vanhove (ORCID: https://orcid.org/0000-0001-5115-4788)
- Jiajie Mei (ORCID: https://orcid.org/0000-0003-3639-9896)
Institutions
- Centre National de la Recherche Scientifique (FR)
- Durham University (GB)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- International Centre for Theoretical Sciences (IN)
- CEA Paris-Saclay (FR)
- Institut de Physique Théorique (FR)
- University of Southampton (GB)
- Ludwig-Maximilians-Universität München (DE)
Publication Details
- Journal
- Journal of High Energy Physics
- Published
- 2025-03-04
- DOI
- https://doi.org/10.1007/jhep03(2025)007
- Citations
- 19
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 21.94
Funders
- Science and Technology Facilities Council