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Neutron Lifetime Anomaly and Big Bang Nucleosynthesis
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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.
Forward citations
Cited by 2 Pith papers
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Weinberg Angle, Neutron Abundance in BBN, and Lifetime
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.
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Particles in finite volumes and a toy model of decaying neutrons
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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