Non-minimally Coupled Running Curvaton for DESI-preferred Dynamical Dark Energy and Hubble Tension
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| Format: | Preprint |
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2026
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| _version_ | 1866910083562078208 |
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| author | Li, Bichu Liu, Lei-Hua |
| author_facet | Li, Bichu Liu, Lei-Hua |
| contents | Recent DESI 2025 results have renewed interest in dynamical dark energy models with phantom crossing. In this work, we extend the running curvaton scenario by introducing a non-minimal gravitational coupling, $ξχ^2 R$. We show that this coupling can drive the late-time equation of state into the DESI-preferred region in the $(w_0,w_a)$ plane. We further find that, at leading order, the early-universe predictions of the original running curvaton model can be preserved through a parameter redefinition, while the scalar sector remains free of gradient instability in the regime considered. A parameter scan identifies viable regions and a benchmark solution that also shifts the background-inferred value of $H_0$ upward. These results suggest that the non-minimally coupled running curvaton provides a viable framework for DESI-motivated dark energy evolution, with possible implications for the Hubble tension. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_09705 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Non-minimally Coupled Running Curvaton for DESI-preferred Dynamical Dark Energy and Hubble Tension Li, Bichu Liu, Lei-Hua Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Recent DESI 2025 results have renewed interest in dynamical dark energy models with phantom crossing. In this work, we extend the running curvaton scenario by introducing a non-minimal gravitational coupling, $ξχ^2 R$. We show that this coupling can drive the late-time equation of state into the DESI-preferred region in the $(w_0,w_a)$ plane. We further find that, at leading order, the early-universe predictions of the original running curvaton model can be preserved through a parameter redefinition, while the scalar sector remains free of gradient instability in the regime considered. A parameter scan identifies viable regions and a benchmark solution that also shifts the background-inferred value of $H_0$ upward. These results suggest that the non-minimally coupled running curvaton provides a viable framework for DESI-motivated dark energy evolution, with possible implications for the Hubble tension. |
| title | Non-minimally Coupled Running Curvaton for DESI-preferred Dynamical Dark Energy and Hubble Tension |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2602.09705 |