Neutron Lifetime Anomaly and Big Bang Nucleosynthesis

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.

v2: References added, plot slightly updated. Matches the version to be published in Canadian Journal of Physics

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• Particles in finite volumes and a toy model of decaying neutrons
• Ultra-cold neutron simulation framework for the free neutron lifetime experiment $\tau$SPECT
• Big Bang Nucleosynthesis as a probe of non-standard neutrino interactions and non-unitary three-neutrino mixing