by Gabriel Colling
Tension among short baseline neutrino experiments has pointed toward the possible need for one or more additional mass splittings in the existing neutrino oscillation framework. This would require the addition of at least one sterile (non-interacting) neutrino to the current model. I will introduce models with one, two, and three sterile neutrinos. The parameters of these models can be constrained with fits to global data. I will present the results of the latest update to our fitting effort, and review future experiments that can address the question.