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Synopsis

*Joint HEP-Cosmology Colloquium*

Ever since the first measurements were made of these ghostly particles, neutrinos have been a constant fascination for physicists because of their unusual properties. One such peculiarity is that neutrinos can seemingly change flavours as they propagate — a phenomenon known as neutrino oscillation. Decades of neutrino experiments have revealed a great deal of their nature, yet many unanswered questions remain: Is there CP-violation in the lepton sector? Which neutrino is the lightest? Are there neutrinos beyond the three generations? The answers to these questions may hold the key to discovering physics beyond the Standard Model and understanding our universe, but answering them requires detectors much more powerful than those currently in operation. In this talk, I will describe the next-generation long-baseline neutrino experiment Hyper-Kamiokande (Hyper-K) and how it will be able to answer these questions and beyond. I will also discuss the various ways in which we are trying to overcome the challenges on the way to reaching the physics potential of Hyper-K.