ALP-portal majorana dark matter

Axion like particles (ALPs) and right-handed neutrinos (RHNs) are two well-motivated dark matter (DM) candidates. However, these have a completely different origin. was proposed to solve the strong CP problem, whereas RHNs were introduced explain light neutrino masses through seesaw mechanisms. We study case of ALP portal RHN DM (Majorana DM) taking into account existing constraints on ALPs. consider leading effective operators mediating interactions between Standard Model (SM) three generate type-I seesaw. Further, ALP-RHN coupling is generalize model which restricted by relic density indirect detection constraint.