We propose a minimal model based on lepton number symmetry (and violation), to address
a common origin of baryon asymmetry, dark matter and neutrino mass generation. The
model consists of a vectorlike fermion to constitute the dark sector, three right-handed
neutrinos (RHNs) to dictate leptogenesis and neutrino mass, while an additional complex
scalar is assumed to be present in the early Universe the decay of which produces both dark
matter and RHNs via lepton number violating and lepton number conserving interactions …