C/CP symmetry violation of $n-n^{\prime}$ and $\overline{n}-\overline{n}^{\prime}$ transitions in a two-brane universe: a baryogenesis portal
Résumé
For the past decade, there has been significant interest in the experimental search for neutron-hidden neutron $n-n^{\prime}$ transitions as predicted by various theoretical models, such as braneworld scenarios where the dark sector resides on a hidden brane. In a recent study, it was demonstrated that a C/CP asymmetry between $n-n^{\prime}$ and $\overline{n}-\overline{n}^{\prime}$ transitions can explain baryogenesis. However, the origins of this asymmetry and its required magnitude were only suggested. In this paper, we demonstrate that both aspects naturally occur due to the presence of an extra scalar field supported by the $U(1)\times U(1)$ gauge group, which extends the conventional electromagnetic gauge field in the two-brane universe.