Self-interacting neutrinos, the Hubble parameter tension, and the cosmic microwave background

Brinckmann, Thejs; Chang, Jae Hyeok; LoVerde, Marilena

doi:10.1103/physrevd.104.063523

Title: Self-interacting neutrinos, the Hubble parameter tension, and the cosmic microwave background

Journal Article · 13 September 2021 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.104.063523 · OSTI ID:1852424

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Stony Brook Univ., NY (United States); OSTI
Univ. of Maryland, College Park, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States)
Stony Brook Univ., NY (United States)

Here, we perform a comprehensive study of cosmological constraints on nonstandard neutrino self-interactions using cosmic microwave background and baryon acoustic oscillation data. We consider different scenarios for neutrino self-interactions distinguished by the fraction of neutrino states allowed to participate in self-interactions and how the relativistic energy density, N_eff, is allowed to vary. Specifically, we study cases in which all neutrino states self-interact and N_eff varies; two species free-stream, which we show alleviates tension with laboratory constraints, while the energy in the additional interacting states varies; and a variable fraction of neutrinos self-interact with either the total N eff fixed to the Standard Model value or allowed to vary. In no case do we find compelling evidence for new neutrino interactions or nonstandard values of N_eff. In several cases, we find additional modes with neutrino decoupling occurring at lower redshifts z_dec ~ 10^3–4. We do a careful analysis to examine whether new neutrino self-interactions solve or alleviate the so-called H₀ tension and find that, when all Planck 2018 CMB temperature and polarization data are included, none of these examples eases the tension more than allowing a variable N_eff comprised of free-streaming particles. Although we focus on neutrino interactions, these constraints are applicable to any light relic particle.

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Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0017848; SC0017938

OSTI ID:: 1852424

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 6 Vol. 104; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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