Cosmological Dressing Rules
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911505055744000 |
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| author | Chowdhury, Chandramouli Lipstein, Arthur Marshall, Joe Mei, Jiajie Sachs, Ivo |
| author_facet | Chowdhury, Chandramouli Lipstein, Arthur Marshall, Joe Mei, Jiajie Sachs, Ivo |
| contents | The basic observables in cosmology are known as in-in correlators. Recent calculations have revealed that in-in correlators in four dimensional de Sitter space exhibit hidden simplicity stemming from a close relation to scattering amplitudes in flat space. In this paper we explain how to make this property manifest by dressing flat space Feynman diagrams with certain auxiliary propagators. These dressing rules are derived for conformally coupled and massless scalar theories and we show that they reproduce the same infrared divergences predicted by the Schwinger-Keldysh formalism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_10598 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmological Dressing Rules Chowdhury, Chandramouli Lipstein, Arthur Marshall, Joe Mei, Jiajie Sachs, Ivo High Energy Physics - Theory General Relativity and Quantum Cosmology The basic observables in cosmology are known as in-in correlators. Recent calculations have revealed that in-in correlators in four dimensional de Sitter space exhibit hidden simplicity stemming from a close relation to scattering amplitudes in flat space. In this paper we explain how to make this property manifest by dressing flat space Feynman diagrams with certain auxiliary propagators. These dressing rules are derived for conformally coupled and massless scalar theories and we show that they reproduce the same infrared divergences predicted by the Schwinger-Keldysh formalism. |
| title | Cosmological Dressing Rules |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2503.10598 |