Ay. Ignatiev et Gc. Joshi, CAN THE ELECTRIC CHARGES OF ELEMENTARY-PARTICLES CHANGE WITH TIME, Physical review. D. Particles and fields, 48(9), 1993, pp. 4481-4483
We present the limits on the possible time variation of the electric c
harges of quarks and leptons at the time of primordial nucleosynthesis
within a model with dequantized electric charges which allows for the
case of a charged neutrino and neutron.