New Physics in the Neutrino Sky

Astrophysical neutrinos offer a unique probe into the most distant and energetic environments in the universe. With an energy scale of TeV—PeV, and cosmological baselines, they allow us to probe a parameter space not easily accessible to colliders. The IceCube neutrino observatory in Antarctica has been detecting a steady flux of astrophysical neutrinos — in addition to the atmospheric neutrinos produced in cosmic-ray interactions — for almost 14 years. I will present highlights from IceCube's major particle physics results, focusing on searches for physics beyond the standard model, dark matter and non-standard neutrino oscillations.