Resolving the Planck-DESI tension by nonminimally coupled quintessence
Abstract
The Planck measurement of the cosmic microwave background (CMB) has established the -cold-dark-matter () model as the concordant model along with other observations. However, recent measurements of baryon acoustic oscillations (BAO) from the Dark Energy Spectroscopic Instrument (DESI) have renewed the matter fraction m tension between Planck- and DESI-. Directly reconciling this CMB-BAO tension with a dynamical DE in Chevallier-Polarski-Linder (CPL) parametrization seems to imply a crossing of the equation-of-state (EOS) through w=-1 at low redshifts. In this paper, we resolve this m tension by allowing for the DM nonminimally coupled to gravity via a quintessence field. This non-minimal coupling is preferred over 3σ confidence level. Consequently, even though the usual effective EOS of the coupled quintessence apart from the standard CDM part never crosses but always is above w=-1, a misidentification with the w0waCDM model would exactly fake such a crossing behavior, and the tensions on neutrino mass and growth rate in the model are also relieved in our model as a result of the resolved m tension.
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