Symmetric Bimetric Cosmology: A Minimal Extension of ΛCDM
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866917081214091264 |
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| author | Imadouchene, Ghani |
| author_facet | Imadouchene, Ghani |
| contents | We construct and analyze a symmetric bimetric cosmological model connecting Anti-de Sitter (AdS) and de Sitter (dS) regimes through a coupled scalar field. Starting from a Lagrangian with Einstein-Hilbert terms for two FLRW metrics and an inter-metric potential, we derive modified Friedmann and Klein-Gordon equations governing their evolution. In the symmetric effective-fluid limit, the model reproduces the main phenomenology of the $Λ$CDM cosmology with a small dynamical correction proportional to $(1+z)^{-3}$, and naturally satisfies local-gravity constraints through Vainshtein screening. This article outlines the theoretical structure and calibration of the model within a dual-geometry cosmological setting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_11929 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Symmetric Bimetric Cosmology: A Minimal Extension of ΛCDM Imadouchene, Ghani General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory 83F05, 83C10, 83C65 We construct and analyze a symmetric bimetric cosmological model connecting Anti-de Sitter (AdS) and de Sitter (dS) regimes through a coupled scalar field. Starting from a Lagrangian with Einstein-Hilbert terms for two FLRW metrics and an inter-metric potential, we derive modified Friedmann and Klein-Gordon equations governing their evolution. In the symmetric effective-fluid limit, the model reproduces the main phenomenology of the $Λ$CDM cosmology with a small dynamical correction proportional to $(1+z)^{-3}$, and naturally satisfies local-gravity constraints through Vainshtein screening. This article outlines the theoretical structure and calibration of the model within a dual-geometry cosmological setting. |
| title | Symmetric Bimetric Cosmology: A Minimal Extension of ΛCDM |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory 83F05, 83C10, 83C65 |
| url | https://arxiv.org/abs/2511.11929 |