Axion
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.
| 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 |
| Electric charge | 0 |
| Spin | 0 |
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