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Description
It has been over ten years since the IceCube Neutrino Observatory found the first evidence of high-energy astrophysical neutrinos. Since that landmark discovery, the field has advanced significantly—improving the precision of astrophysical neutrino spectrum measurements and identifying the first sources of these elusive particles. In this talk, I will present recent work that uses high-energy astrophysical neutrinos as a probe for new physics. In particular, I will focus on the case of quasi-Dirac neutrinos, where the Majorana mass term is much smaller than the Dirac term. In this scenario, oscillations can occur between left- and right-handed neutrino states over astrophysical and cosmological distances. I will discuss the sensitivity of IceCube to such oscillations and present recent results that explore this possibility.
