Axions, conceptual illustration
Axions, conceptual illustration. The axion is represented here as a detergent capable of cleaning up dark matter related problems and the strong CP-symmetry problem. Axions are hypothetical elementary particles suggested to explain why charge-parity (CP) symmetry is preserved in quantum chromodynamics (QCD). They have since been proposed as a leading candidate for dark matter and the reason why there is more matter than antimatter in the universe. Axions have masses billions of times less than that of an electron., by RAMON ANDRADE 3DCIENCIA/SCIENCE PHOTO LIBRARY
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