The subtle simplicity of cosmological correlators
Abstract 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...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-03-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP03(2025)007 |
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| author | Chandramouli Chowdhury Arthur Lipstein Jiajie Mei Ivo Sachs Pierre Vanhove |
| author_facet | Chandramouli Chowdhury Arthur Lipstein Jiajie Mei Ivo Sachs Pierre Vanhove |
| author_sort | Chandramouli Chowdhury |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-84bd9a9c219a421ba2ede3caa38f00a0 |
| institution | DOAJ |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-84bd9a9c219a421ba2ede3caa38f00a02025-08-20T03:06:47ZengSpringerOpenJournal of High Energy Physics1029-84792025-03-012025315410.1007/JHEP03(2025)007The subtle simplicity of cosmological correlatorsChandramouli Chowdhury0Arthur Lipstein1Jiajie Mei2Ivo Sachs3Pierre Vanhove4Mathematical Sciences and STAG Research Centre, University of SouthamptonDepartment of Mathematical Sciences, Durham UniversityDepartment of Mathematical Sciences, Durham UniversityArnold-Sommerfeld-Center for Theoretical Physics, Ludwig-Maximilians-Universität MünchenInstitut de Physique Théorique, Université Paris-Saclay, CEA, CNRSAbstract 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.https://doi.org/10.1007/JHEP03(2025)007AdS-CFT CorrespondenceScattering Amplitudes |
| spellingShingle | Chandramouli Chowdhury Arthur Lipstein Jiajie Mei Ivo Sachs Pierre Vanhove The subtle simplicity of cosmological correlators Journal of High Energy Physics AdS-CFT Correspondence Scattering Amplitudes |
| title | The subtle simplicity of cosmological correlators |
| title_full | The subtle simplicity of cosmological correlators |
| title_fullStr | The subtle simplicity of cosmological correlators |
| title_full_unstemmed | The subtle simplicity of cosmological correlators |
| title_short | The subtle simplicity of cosmological correlators |
| title_sort | subtle simplicity of cosmological correlators |
| topic | AdS-CFT Correspondence Scattering Amplitudes |
| url | https://doi.org/10.1007/JHEP03(2025)007 |
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