Papers › Restoring cosmological concordance with early dark energy and massive neutrinos?
Restoring cosmological concordance with early dark energy and massive neutrinos?
Alexander Reeves, Laura Herold, Sunny Vagnozzi, Blake D. Sherwin, Elisa G. M. Ferreira
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The early dark energy (EDE) solution to the Hubble tension comes at the cost of an increased clustering amplitude that has been argued to worsen the fit to galaxy clustering data. We explore whether freeing the total neutrino mass M_ν, which can suppress small-scale structure growth, improves EDE's fit to galaxy clustering. Using Planck Cosmic Microwave Background and BOSS galaxy clustering data, a Bayesian analysis shows that freeing M_ν does not appreciably increase the inferred EDE fraction f_(EDE): we find the 95% C.L. upper limits f_(EDE)<0.092 and M_ν<0.15 eV. Similarly, in a frequentist profile likelihood setting (where our results support previous findings that prior volume effects are important), we find that the baseline EDE model (with M_ν=0.06 eV) provides the overall best fit. For instance, compared to baseline EDE, a model with M_ν=0.24 eV maintains the same H₀(km/s/Mpc)=(70.08, 70.11, respectively) whilst decreasing S₈=(0.837, 0.826) to the ΛCDM level, but worsening the fit significantly by Δχ²=7.5. For the datasets used, these results are driven not by the clustering amplitude, but by background modifications to the late-time expansion rate due to massive neutrinos, which worsen the fit to measurements of the BAO scale.
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