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| Interactions | Gravitational, electromagnetic, strong nuclear, weak nuclear |
|---|---|
| Status | Hypothetical |
| Symbol | A0, a, θ |
| Theorized | 1977, Peccei and Quinn |
| Mass | 10−5 to 1 eV/c2 [1] |
| Electric charge | 0 |
| Spin | 0 |
An axion (/ˈæksiɒn/) is a hypothetical elementary particle originally postulated by the Peccei–Quinn theory in 1977 to resolve the strong CP problem in quantum chromodynamics (QCD). If axions exist and have low mass within a specific range, they are of interest as a possible component of cold dark matter.
- ^ Peccei, R. D. (2008). "The Strong CP Problem and Axions". In Kuster, Markus; Raffelt, Georg; Beltrán, Berta (eds.). Axions: Theory, Cosmology, and Experimental Searches. Lecture Notes in Physics. Vol. 741. pp. 3–17. arXiv:hep-ph/0607268. doi:10.1007/978-3-540-73518-2_1. ISBN 978-3-540-73517-5. S2CID 119482294.
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