Why does the Universe exist? We believe that the Big Bang created matter and its opposite – antimatter – in equal amounts, and we know experimentally that when matter and antimatter come together, they destroy each other in a burst of energy. So why hasn’t that happened? This is one of the most fundamental questions we have about nature, and answers might be found in an unexpected place: subatomic particles called neutrinos.

Neutrinos are the most important particle you were never taught about. They are created in radioactive decays in the sun, the centre of the Earth, supernovae, and even beer. Around 100 billion pass through your thumbnail every second, but you’ve probably never noticed. In this talk, particle physicist Kirsty Duffy will explain what neutrinos are, why they are so interesting to particle physicists, how they might explain why the universe exists, and the mega-science experiments being built to find out.

Kirsty will draw on her work on DUNE, The Deep Underground Neutrino Experiment, a next-generation experiment using leading-edge multi-kiloton liquid argon detectors, which is due to turn on towards the end of the decade. It will make measurements of neutrinos with unprecedented precision, and may hold the key to answering some of the most fundamental questions in physics.

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