Why does the universe exist? The answer might be hiding in a ghost particle.
In short: Neutrinos are the most abundant matter particles in the universe, yet they are so elusive that only one will likely interact with your body in your entire lifetime. These ghostly particles, which pass through the Earth unimpeded, could finally explain why our universe is made of matter rather than nothing.
Neutrinos are subatomic particles produced in the sun, supernovae, the Earth's core, and even radioactive potassium in bananas. Despite their ubiquity—with roughly 100 billion passing through your thumbnail every second—they are notoriously difficult to study. They interact only via the weak force, meaning they typically pass through matter without leaving a trace. Because they rarely collide with atoms, detecting them requires massive, specialized equipment like the liquid argon detectors used in the MicroBooNE experiment, which operate at a chilling minus 186 degrees Celsius.
The central mystery driving neutrino research is the fundamental asymmetry of our universe. Cosmological models suggest the Big Bang should have produced equal amounts of matter and antimatter, which would have annihilated each other, leaving behind nothing. Yet, we exist in a universe dominated by matter. Physicists hypothesize that a tiny discrepancy—perhaps one extra particle of matter for every million particles of antimatter—allowed matter to survive. While researchers have observed small differences in how quarks behave, these are insufficient to explain the current state of the cosmos.
This is where neutrino oscillation becomes critical. Scientists discovered that neutrinos can change between three distinct types, or 'flavours,' as they travel. This phenomenon, which earned a Nobel Prize in 2015, suggests our current standard model of particle physics is incomplete. By comparing how neutrinos and their antimatter counterparts, anti-neutrinos, oscillate over long distances, physicists hope to uncover a unique physical mechanism that explains the dominance of matter. Projects like the Deep Underground Neutrino Experiment (DUNE), currently under construction a mile underground in South Dakota, represent the next generation of efforts to solve this profound puzzle.
Kirsty Duffy, an Associate Professor at the University of Oxford and physics lead for the MicroBooNE collaboration, emphasizes that neutrinos are the most important particles most people have never heard of. By firing beams of neutrinos through the Earth over hundreds of kilometres to measure their transformation, scientists are attempting to map the subtle differences in their behaviour. If these experiments reveal that neutrinos and anti-neutrinos oscillate differently, it could provide the missing link in understanding why the universe exists at all.
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Sources
- Summary by Intellect · source: Neutrinos: The ghost particle that could explain why you exist | with Kirsty Duffy
- Also: Even Bananas - The Queen's College, Oxford
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