Abstract: Sterile neutrino is one of the attractive hypothetical particles that can explain major puzzles in our Universe: the origin of neutrino mass, the existence of dark matter, and the matter-antimatter asymmetry. Standard Model (SM) effective field theory with light sterile neutrinos is called nuSMEFT, which includes not only renormalizable interactions between the SM particles and sterile neutrinos but also higher-dimensional operators obtained by integrating out heavy degrees of freedom. In this talk, I will discuss how nuSMEFT interactions contribute to neutrinoless double beta decay and sterile neutrino Dark Matter.
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