http://arxiv.org/abs/1809.08108
We propose a version of the Affleck-Dine baryogenesis, which uses a decay of two superheavy scalar fields with close masses. These scalars acquire non-zero expectation values during inflation through linear couplings to a function of an inflaton. After the inflaton decay, the model possesses approximate U(1)-invariance, explicitly broken by a small mass splitting. This splitting leads to the baryogenesis in the early Universe. The resulting baryon charge density is fully determined by the inflaton dynamics and the Lagrangian parameters, i.e., is independent of initial pre-inflationary conditions for the scalars. As a consequence, baryon perturbations are purely adiabatic. We point out a possible origin of the mass splitting: masses of scalars degenerate at some large energy scale may acquire different loop corrections due to the interaction with the inflaton.
E. Babichev, D. Gorbunov and S. Ramazanov
Mon, 24 Sep 18
38/50
Comments: 5 pages