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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.14694 |
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| _version_ | 1866915679469305856 |
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| author | Chowdhury, Chandramouli Lipstein, Arthur Marshall, Joe Zhang, Alex Jiayi |
| author_facet | Chowdhury, Chandramouli Lipstein, Arthur Marshall, Joe Zhang, Alex Jiayi |
| contents | In-in correlators are the basic observables in cosmology and are traditionally computed using the Schwinger-Keldysh formalism. In this paper we revisit this formalism for photons, gluons, and gravitons coupled to scalars in four dimensional de Sitter space and provide a novel treatment of boundary gauge-fixing of the underlying path integral. We also derive effective actions in Euclidean Anti-de Sitter space whose Feynman rules compute the in-in correlators of these theories in de Sitter space, generalising the shadow formalism recently obtained for scalar theories. We illustrate this formalism in a number of examples at tree-level and 1-loop, demonstrating its relative simplicity compared to other approaches. Moreover, we initiate the study of color/kinematics duality and the double copy for in-in correlators using dressing rules which uplift flat space Feynman diagrams to de Sitter space. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_14694 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On in-in correlators for spinning theories and their shadow formulation Chowdhury, Chandramouli Lipstein, Arthur Marshall, Joe Zhang, Alex Jiayi High Energy Physics - Theory In-in correlators are the basic observables in cosmology and are traditionally computed using the Schwinger-Keldysh formalism. In this paper we revisit this formalism for photons, gluons, and gravitons coupled to scalars in four dimensional de Sitter space and provide a novel treatment of boundary gauge-fixing of the underlying path integral. We also derive effective actions in Euclidean Anti-de Sitter space whose Feynman rules compute the in-in correlators of these theories in de Sitter space, generalising the shadow formalism recently obtained for scalar theories. We illustrate this formalism in a number of examples at tree-level and 1-loop, demonstrating its relative simplicity compared to other approaches. Moreover, we initiate the study of color/kinematics duality and the double copy for in-in correlators using dressing rules which uplift flat space Feynman diagrams to de Sitter space. |
| title | On in-in correlators for spinning theories and their shadow formulation |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2512.14694 |