Féeton ($B-L$ Gauge Boson) Dark Matter for the 511-keV Gamma-Ray Excess and the Prediction of Low-energy Neutrino Flux

Yu Cheng, Weikang Lin, Jie Sheng +1

The féeton is the gauge boson of the $U(1{)}_{B-L}$ gauge theory. If the gauge coupling constant is extremely small, it becomes a candidate for dark matter. We show that its decay to…