Conservation of superhorizon curvature perturbations at one loop: Backreaction in the in-in formalism and Renormalization
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866908358842253312 |
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| author | Inomata, Keisuke |
| author_facet | Inomata, Keisuke |
| contents | We show that the superhorizon-limit curvature perturbations are conserved at one-loop level in single-field inflation models with a transient non-slow-roll period. We take the spatially-flat gauge, where the backreaction plays a crucial role for the conservation of superhorizon curvature perturbations unless the counter terms are tuned. We calculate the backreaction with the in-in formalism. In addition, we explicitly show the renormalization of the UV divergences with the counter terms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08707 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Conservation of superhorizon curvature perturbations at one loop: Backreaction in the in-in formalism and Renormalization Inomata, Keisuke Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory We show that the superhorizon-limit curvature perturbations are conserved at one-loop level in single-field inflation models with a transient non-slow-roll period. We take the spatially-flat gauge, where the backreaction plays a crucial role for the conservation of superhorizon curvature perturbations unless the counter terms are tuned. We calculate the backreaction with the in-in formalism. In addition, we explicitly show the renormalization of the UV divergences with the counter terms. |
| title | Conservation of superhorizon curvature perturbations at one loop: Backreaction in the in-in formalism and Renormalization |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2502.08707 |