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Keyword: scalar field ×Clear all

3 claims from 1 paper

1. Physics and Astronomy › Cosmology and Gravitation Theories

   Nonminimally coupled quintessence with sign-switching interaction

   Wang, Cai, Guo, Li, Wang and Zhang · Physical review. D/Physical review. D. · 2026

   The paper proposes a nonminimally coupled quintessence model with a sign-changing dark matter–dark energy energy transfer, to account for late-time dark energy dynamics suggested by DESI measurements.

   Unchecked3 claims
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   1. UncheckedIn the proposed model, quintessence density only starts falling once it dominates the Universe, which would explain why dark energy weakens late.“Within this framework, the quintessence density begins to decrease only when it starts to dominate the Universe, which naturally accounts for the late-time onset of dark energy weakening.”
   2. UncheckedIn the proposed model, the coupling makes the effective energy transfer between dark matter and dark energy change sign as the Universe evolves.“The coupling also induces a sign change in the effective energy transfer between dark matter and dark energy during cosmic evolution.”
   3. UncheckedThe authors' new quintessence model is favoured more strongly by current cosmological data than both ΛCDM and w0waCDM.“Compared with both $Λ\mathrm{CDM}$ and $w_0w_a\mathrm{CDM}$ models, our model is favored more strongly by current cosmological data.”