Common Origin of Dark Matter and Leptogenesis in $U(1)_{B-L}$

TL;DR

This paper explores a unified model where dark matter and leptogenesis originate from the $U(1)_{B-L}$ symmetry, showing their interconnected roles in explaining baryon asymmetry and dark matter abundance.

Contribution

It identifies a common parameter space in the $U(1)_{B-L}$ model where dark matter and leptogenesis coexist, considering both global and local symmetry scenarios.

Findings

Viable parameter space for dark matter and leptogenesis is established.

Sterile neutrinos at TeV scale can generate baryon asymmetry via resonance leptogenesis.

Dark matter annihilation processes are closely linked to leptogenesis mechanisms.

Abstract

In this paper, we investigate the common parameter space of dark matter and leptogenesis in the $U(1)_{B-L}$ symmetry. This model involves a complex scalar $\phi$, sterile neutrinos $N$, and Majorana dark matter $\chi$, where only dark matter $\chi$ is charged under the $Z_2$ symmetry. Masses of $N$ and $\chi$ are generated via the Yukawa interactions to $\phi$ after breaking of the $U(1)_{B-L}$ symmetry. TeV scale sterile neutrinos $N$ are responsible for the generation of baryon asymmetry through the resonance leptogenesis mechanism. The new particles in the $U(1)_{B-L}$ have a significant impact on the dilution of $N$, thus on leptogenesis. Meanwhile, the annihilation processes of dark matter $\chi$ are almost identical to that of $N$, which indicates that both leptogenesis and dark matter are closely related to satisfying the observed results simultaneously. Under various theoretical and experimental constraints, the viable common parameter space of dark matter and leptogenesis is obtained for both global and local $U(1)_{B-L}$ symmetry.