The Research Of Sterile Neutrino Dark Matter Models

Dark matter and neutrino physics are challenging fields in modern physics research, which are interdisciplinary areas at the intersection of particle physics, astrophysics and cosmology. More importantly, both of them clearly have new physics signals beyond the standard model. Interestingly, the right-handed neutrinos, which are required by non-zero neutrino masses, could also be natural dark matter candidates and have received wide attention.In this thesis, we first review the status of dark matter research, including the evidence from astronomical observations, its relic density, and potential candidates in particle physics models. We then introduce direct and indirect dark matter detections. In Chapter3, we summarize the status of right-handed neutrinos, including the phenomenology of neutrino oscillation, the mass and lepton flavor mixings of neutrinos, mechanisms for neutrino mass generation and the Neutrino Minimal Standard Model (vMSM). At the end of this chapter, we briefly discuss the mass range of right-handed neutrinos.For sterile neutrino dark matter, a systematic introduction is given in three respects:keV mass model building, production in early universe and X-Ray detections. We then focus on latest XMM-Newton experimental data, which might suggest the sterile neutrino mass to be about7.1keV. In the Shi-Fuller model of resonantly-production mechanism, the calculation shows that the lepton number parameter with L=104Lvα≈4.6is consistent with X-Ray detection data. The tiny mixing angle sinθ and sterile neutrino mass can be estimated in Split flavor model by introducing an adjustable factorε, which relates neutrino mass to the Planck scale and the gravitino mass in a model dependent way.