Non-minimally Coupled Running Curvaton for DESI-motivated Dynamical Dark Energy
astro-ph.CO, gr-qc, hep-ph, hep-th
Submitted: 2026-02-10
Updated: 2026-09-14
Comments: To be published by EPJC
License: http://creativecommons.org/publicdomain/zero/1.0/
The gist: Recent DESI BAO data combined with CMB and supernova measurements suggest a dynamical dark energy that can cross the phantom divide.
Terminology
Abstract
Recent DESI BAO data combined with CMB and supernova measurements suggest a dynamical dark energy that can cross the phantom divide. We show that introducing a non-minimal coupling ξχ 2R to the running-curvaton framework allows a single field to drive early-universe curvature perturbations and late-time phantom-crossing cosmic acceleration without ghost instabilities. Using MCMC background likelihoods with DESI DR2 BAO, Pantheon+ SNe, and a reduced CMB prior, we constrain the cosmological parameters: H 0 = 67.88+0.53-0.61, km,s-1,Mpc-1, Ω m = 0.3072+0.0059-0.0054, w 0 = -0.922+0.055-0.063, and w a = -0.205+0.173-0.182. Parameter degeneracies leave the coupling constants weakly constrained, highlighting the need for full perturbation-level analysis using CMB spectra and lensing.
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