Neutrino-dark sector equilibration and primordial element abundances

Giovanetti, Cara; Schmaltz, Martin; Weiner, Neal

doi:10.1103/PhysRevD.111.043526

Title: Neutrino-dark sector equilibration and primordial element abundances

Journal Article · 12 February 2025 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.111.043526 · OSTI ID:2515662

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After neutrinos decouple from the photon bath, they can populate a thermal dark sector. If this neutrino cooling occurs at a temperature above $\sim 100 keV$ , it can impact light element abundances. We calculate the changes to the $Y_{P}$ and $D / H$ abundances in this scenario with a suitably customized version of the public big bang nucleosynthesis code PRIMAT. If electron neutrinos significantly participate in the cooling, we find limits down to temperatures as low as 100 keV. And if the dark sector undergoes a “step” in $N_{eff}$ , there can be additional, $ω_{b}$ -dependent constraints. Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0015845

OSTI ID:: 2515662

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 4 Vol. 111; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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