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| Main Authors: | , , |
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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2605.17754 |
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| _version_ | 1866914576178610176 |
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| author | Wang, Jincheng Yu, Hongwei Wu, Puxun |
| author_facet | Wang, Jincheng Yu, Hongwei Wu, Puxun |
| contents | Quintessence with a potential motivated by supergravity (SUGRA) exhibits several intriguing features. Depending on its initial conditions, it can behave either as dynamical dark energy or effectively as a cosmological constant. Moreover, when quintessence is coupled to dark matter, the effective dark-energy equation of state can cross the phantom divide. In this paper, we test both coupled and uncoupled SUGRA quintessence models using DESI BAO, DES-Dovekie SNIa, and Planck CMB data. We find that current observations strongly favor a coupling between dark energy and dark matter, with the coupling parameter deviating from zero at more than $4σ$. The data also favor the branch of coupled SUGRA quintessence in which the energy transfer between the two dark sectors changes sign, leading to a crossing of the phantom divide by the effective dark-energy equation of state. Interestingly, this coupled SUGRA branch is statistically indistinguishable from dark energy described by the CPL parametrization, with only a very small difference in $χ^2_\mathrm{min}$. Our results suggest that coupled quintessence with a SUGRA potential provides a field-theoretic realization of the evolving dark energy behavior favored by the latest observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_17754 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Coupled quintessence with a potential from supergravity exhibits sign-changing interaction Wang, Jincheng Yu, Hongwei Wu, Puxun Cosmology and Nongalactic Astrophysics Quintessence with a potential motivated by supergravity (SUGRA) exhibits several intriguing features. Depending on its initial conditions, it can behave either as dynamical dark energy or effectively as a cosmological constant. Moreover, when quintessence is coupled to dark matter, the effective dark-energy equation of state can cross the phantom divide. In this paper, we test both coupled and uncoupled SUGRA quintessence models using DESI BAO, DES-Dovekie SNIa, and Planck CMB data. We find that current observations strongly favor a coupling between dark energy and dark matter, with the coupling parameter deviating from zero at more than $4σ$. The data also favor the branch of coupled SUGRA quintessence in which the energy transfer between the two dark sectors changes sign, leading to a crossing of the phantom divide by the effective dark-energy equation of state. Interestingly, this coupled SUGRA branch is statistically indistinguishable from dark energy described by the CPL parametrization, with only a very small difference in $χ^2_\mathrm{min}$. Our results suggest that coupled quintessence with a SUGRA potential provides a field-theoretic realization of the evolving dark energy behavior favored by the latest observations. |
| title | Coupled quintessence with a potential from supergravity exhibits sign-changing interaction |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2605.17754 |