A CMB search for the neutrino mass mechanism and its relation to the Hubble tension

By Miguel Escudero, Samuel J. Witte. The European Physical Journal C, 2019

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The majoron, a pseudo-Goldstone boson arising from the spontaneous breaking of global lepton number, is a generic feature of many models intended to explain the origin of the small neutrino masses. In this work, we investigate potential imprints in the cosmic microwave background (CMB) arising from massive majorons, should they thermalize with neutrinos after Big Bang Nucleosynthesis via inverse neutrino decays. We show that Planck2018 measurements of the CMB are currently sensitive to neutrino-majoron couplings as small as λ∼10-13\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\lambda \sim 10^{-13}$$\end{document}, which if interpreted in the context of the type-I seesaw mechanism correspond to a lepton number symmetry breaking scale vL∼O(100)GeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$v_L \sim {\mathcal {O}}(100) \, \mathrm{GeV}$$\end{document}. Additionally, we identify parameter space for which the majoron-neutrino interactions, collectively with an extra contribution to the effective number of relativistic species Neff\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$N_\mathrm{eff}$$\end{document}, can ameliorate the outstanding H0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$H_0$$\end{document} tension.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1e7eb6e6e230bee6a0e70252e06000bd56c0cd22

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Citations in the corpus

Precision early universe thermodynamics made simple: Neff and neutrino decoupling in the Standard Model and beyond (2020, methodology): “J C A P 0 5 ( 2 0 2 0 ) 0 4 8 study and by analyzing Planck legacy data [2, 3], strong constraints on the parameter space were derived in [46].”
The POEMMA (Probe of Extreme Multi-Messenger Astrophysics) observatory (2020, background): “Secret neutrino interactions are potential BSM neutrino-neutrino (νν) interactions motivated as solutions to important open issues, including tensions in cosmology [111–114] and the origin or neutrino mass [115–120].”