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Neutron Lifetime Anomaly and Big Bang Nucleosynthesis

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arxiv 2210.12031 v2 pith:YEL45A6C submitted 2022-10-21 hep-ph astro-ph.COnucl-th

classification hep-phastro-ph.COnucl-th
keywords bangneutronnucleosynthesisabundancesanomalycalculatecalculatedcollaborations
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We calculate the Big Bang Nucleosynthesis abundances for helium-4 and deuterium for a range of neutron lifetimes, $\tau_n = 840 - 1050$ s, using the state-of-the-art Python package \textsc{PRyMordial}. We show the results for two different nuclear reaction rates, calculated by NACRE II [1] and the PRIMAT [2] collaborations.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Weinberg Angle, Neutron Abundance in BBN, and Lifetime

    hep-ph 2026-03 conditional novelty 4.0 of 10

    Small shifts in the Weinberg angle change the effective Fermi constant enough to visibly alter the neutron abundance at BBN onset and the neutron lifetime in the early-Universe plasma.

  2. Particles in finite volumes and a toy model of decaying neutrons

    hep-ph 2025-04 reject novelty 4.0 of 10

    A toy scalar model of neutron decay suggests finite-volume effects and initial neutron-daughter correlations can shift the predicted neutron lifetime to about 887 seconds, but the agreement is obtained by tuning a parameter.

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