Kayser Abstract

We review the experimental hints of light sterile neutrinos, with masses of order 1 eV. We comment on cosmological constraints and on attempts at global fits. We then discuss ideas for future experiments that hopefully will determine definitively whether light sterile neutrinos exist. Finally, we briefly discuss the possibility of superheavy sterile neutrinos, whose decays could explain the matter-antimatter asymmetry of the universe.

Diaz Abstract

Lorentz symmetry is a cornerstone of modern physics. As the spacetime symmetry of special relativity, Lorentz invariance is a basic component of the standard model of particle physics and general relativity, which to date constitute our most successful descriptions of nature. Deviations from exact symmetry would radically change our view of the universe and current experiments allow us to test the validity of this assumption. In this talk, I will describe how we can use current and future neutrino-beam experiments to search for some key signals of the violation of Lorentz invariance in neutrino oscillations and time-of-flight measurements.