Title: Monopole Baryogenesis with a theta angle

Abstract: Monopoles are generally expected in Grand Unified Theories (GUTs) where they can catalyze baryon decay at an unsuppressed rate by the Callan-Rubakov effect. For the first time, we show that this catalysis effect can generate the observed baryon asymmetry at GeV-scale temperatures. We study the minimal SU(5) GUT model and demonstrate that monopole-fermion scattering with a CP-violating theta-term leads to realistic baryogenesis even if theta is as small as 10^-10, consistent with current experimental bounds. Our calculation also shows that to generate the observed baryon asymmetry, the abundance of the monopoles is below the current experimental bounds and becomes an interesting experimental target.

https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09