A precision calculation of relic neutrino decoupling
By K. Akita, Masahide Yamaguchi. Journal of Cosmology and Astroparticle Physics, 2020
294 citations recorded by the source corpus.
We study the distortions of equilibrium spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early Universe. We solve the integro-differential kinetic equations for the neutrino density matrix, including three-flavor oscillations and finite temperature corrections from QED up to the next-to-leading order O(e3) for the first time. In addition, the equivalent kinetic equations in the mass basis of neutrinos are directly solved, and we numerically evaluate the distortions of the neutrino spectra in the mass basis as well, which can be easily extrapolated into those for non-relativistic neutrinos in the current Universe. In both bases, we find the same value of the effective number of neutrinos, Neff=3.044, which parameterizes the total neutrino energy density. The estimated error for the value of Neff due to the numerical calculations and the choice of neutrino mixing parameters would be at most 0.0005.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/32fd8c74493c08785e9385e82f48ae965f8e9e44
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Citations in the corpus
- Cosmology Intertwined II: The Hubble Constant Tension (2020, unknown): “[218] K.”
- Towards a precision calculation of $N_{\rm eff}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED (2020, methodology): “Following the procedure laid down in [19], the said correction was recently adopted in [12, 13] in their computation of NSM eff .”
- Cosmological parameters derived from the final Planck data release (PR4) (2023, methodology): “We now discuss constraints on some extensions to the base-Λ CDM model.”
- Towards a precision calculation of the effective number of neutrinos Neff in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED (2021, methodology): “Following the procedure laid down in [19], the said correction was recently adopted in [12, 13] in their computation of NSM eff .”