(physics) A hypothetical subatomic particle postulated to resolve certain symmetry problems concerning the strong nuclear force.
- 2000 Summer/Fall, John Clarke, Superconductivity: A Macroscopic Quantum Phenomenon, Rene Donaldson, Bill Kirk (editors), Beam Line, Volume 30, Number 2, Stanford Linear Accelerator Center, page 47,
The axion is a candidate particle for the cold dark matter that constitutes a large fraction of the mass of the Universe.
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