Cosmology with a Non-minimally Coupled Dark Matter Fluid I. Background Evolution
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908588604129280 |
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| author | Silveravalle, Samuele Lapi, Andrea Benetti, Francesco Liberati, Stefano |
| author_facet | Silveravalle, Samuele Lapi, Andrea Benetti, Francesco Liberati, Stefano |
| contents | We explore a cosmological model in which dark matter is non-minimally coupled to gravity at the fluid level. While typically subdominant compared to Standard Model forces, such couplings may dominate dark matter dynamics. We show that this interaction modifies the early-time Friedmann equations, driving a phase of accelerated expansion that can resolve the horizon and flatness problems without introducing additional fields. At even earlier times, the coupling to spatial curvature may give rise to a cosmological bounce, replacing the initial singularity of standard cosmology. These results suggest that non-minimally coupled dark matter could offer a unified framework for addressing both the singularity and fine-tuning problems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_16614 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmology with a Non-minimally Coupled Dark Matter Fluid I. Background Evolution Silveravalle, Samuele Lapi, Andrea Benetti, Francesco Liberati, Stefano General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics We explore a cosmological model in which dark matter is non-minimally coupled to gravity at the fluid level. While typically subdominant compared to Standard Model forces, such couplings may dominate dark matter dynamics. We show that this interaction modifies the early-time Friedmann equations, driving a phase of accelerated expansion that can resolve the horizon and flatness problems without introducing additional fields. At even earlier times, the coupling to spatial curvature may give rise to a cosmological bounce, replacing the initial singularity of standard cosmology. These results suggest that non-minimally coupled dark matter could offer a unified framework for addressing both the singularity and fine-tuning problems. |
| title | Cosmology with a Non-minimally Coupled Dark Matter Fluid I. Background Evolution |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2507.16614 |