Bayesian and frequentist analyses show the equal-mass approximation for neutrino masses remains adequate for Planck+DESI data, provided the oscillation-motivated lower bounds on the neutrino mass sum are imposed.
Are priors responsible for cosmology favoring additional neutrino species?
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abstract
It has been suggested that both recent cosmological data and the results of flavor oscillation experiments (MiniBooNE and LSND) lend support to the existence of low-mass sterile neutrinos. The cosmological data appear to weakly favor additional forms of radiation in the Universe, beyond photons and three standard neutrino families. We reconsider the cosmological evidence by making the resulting confidence intervals on the additional effective neutrino species as prior-independent as possible. We find that, once the prior-dependence is removed, the latest cosmological data show no evidence for deviations from the standard number of neutrino species.
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astro-ph.CO 1years
2024 1verdicts
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Revisiting the impact of neutrino mass hierarchies on neutrino mass constraints in light of recent DESI data
Bayesian and frequentist analyses show the equal-mass approximation for neutrino masses remains adequate for Planck+DESI data, provided the oscillation-motivated lower bounds on the neutrino mass sum are imposed.