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Exponential cosmology with massive neutrinos as a dynamical dark energy framework
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DOI：10.1016/j.aop.2026.170621.png)
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Abstract
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The exponential gravity model provides a theoretically well-motivated extension of General Relativity, introducing a modified gravitational dynamics at late times consistent with a dynamical dark energy scenario, while recovering the CDM-like regime at high redshifts with a smooth transition. Using a Bayesian Markov Chain Monte Carlo (MCMC) analysis, we constrain the parameters of the exponential model in combination with the total neutrino mass , employing the latest measurements from cosmic chronometers, the DESI DR2 BAO data, the CMB acoustic scale, and the Pantheon+ supernovae compilation, comparing the results with the CDM and the CDM models. Our results show that the exponential model remains consistent with current observations while partially alleviating the Hubble tension and the neutrino mass problem relative to CDM, although the constraints on are tighter than those obtained for the phenomenological CDM scenario. These results indicate that the interplay between modified gravity and neutrino physics in the late Universe may offer a viable framework for further investigating cosmological tensions.
Keywords:
Cosmology
Modified gravity
Dark energy
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