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.
BeyondΛCDM: fundamental constants as cosmological observ- ables,
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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.