Weinberg Angle, Neutron Abundance in BBN, and Lifetime
High Energy Physics - Phenomenology
2026-03-04 v1 Cosmology and Nongalactic Astrophysics
Nuclear Theory
Abstract
The Big-Bang nucleosynthesis (BBN) initial neutron abundance and the neutron lifetime depend on the magnitude of the Fermi coupling constant . When allowing for radiative corrections, depends on the symmetry breaking Weinberg angle , a free parameter in the standard model of particle physics which could have considerable environmental (e.g. cosmological or temperature) dependence. We establish how the value of influences BBN and neutron lifetime.
Keywords
Cite
@article{arxiv.2603.02652,
title = {Weinberg Angle, Neutron Abundance in BBN, and Lifetime},
author = {Cheng Tao Yang and Johann Rafelski},
journal= {arXiv preprint arXiv:2603.02652},
year = {2026}
}
Comments
20 MDPI pages, 9 figures, submitted to Particles and Plasmas special volume