Recent Paper looks for Lepton Axial force in solar oscillations.

In https://arxiv.org/abs/2412.10724 Fang et al, look at how the matter effect on an lepton axial force world effect neutrio oscillation, and provide a strong exclusion g_vv g_A <10^-51. However they assume that all protons and neutrons have exactly the same axial force interaction. Because of conversation in beta decay we must have Q(n)=1+Q(p) so neutons and protons might have opposite charges .e.g 1/2 escaping Fangs, bounds. With photons and neutrons being oppositely charged to oscillation measurement might be very changed, and also if matter is net uncharged due to a background of slow neutrinos in matter.