Abstract
We present cosmological constraints on the sum of neutrino masses as a function of the neutrino lifetime, in a framework in which neutrinos decay into dark radiation after becoming non-relativistic. We find that in this regime the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO) and (uncalibrated) luminosity distance to supernovae from the Pantheon catalog constrain the sum of neutrino masses ∑mν to obey ∑mν < 0.42 eV at (95% C.L.). While the bound has improved significantly as compared to the limits on the same scenario from Planck 2015, it still represents a significant relaxation of the constraints as compared to the stable neutrino case. We show that most of the improvement can be traced to the more precise measurements of low-ℓ polarization data in Planck 2018, which leads to tighter constraints on τreio (and thereby on As), breaking the degeneracy arising from the effect of (large) neutrino masses on the amplitude of the CMB power spectrum.
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Abellán, G.F., Chacko, Z., Dev, A. et al. Improved cosmological constraints on the neutrino mass and lifetime. J. High Energ. Phys. 2022, 76 (2022). https://doi.org/10.1007/JHEP08(2022)076
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DOI: https://doi.org/10.1007/JHEP08(2022)076