Type: article
Abstract: We investigate cosmological correlators for conformally coupled ϕ4 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.
Institutions: International Centre for Theoretical Sciences, University of Southampton, Durham University, Ludwig-Maximilians-Universität München, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, CEA Paris-Saclay, Institut de Physique Théorique
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: CERN, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Abdus Salam International Centre for Theoretical Physics, China Scholarship Council, Centre National de la Recherche Scientifique, Indian Institute of Technology Kharagpur, Institut Henri Poincaré, Sorbonne Université, Science and Technology Facilities Council
Awards: G1677287301, Symmetries and moduli spaces in algebraic geometry and physics, G2879864793, New Frontiers in Particle Physics, Cosmology and Gravity, G3375465512, G4066435496, EXC 2094: ORIGINS: Vom Ursprung des Universums bis zu den ersten Bausteinen des Lebens, Particles, Fields and Spacetime, G5058101487, G5296751580, G6363417690, G6389258043, G6453481984, G6505494016, G7240651115, G7342182005, G7376787254
OpenAlex ID: W6921839795
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