One of the remaining unsolved problems in our understanding of the universe

Why is there far more matter than antimatter in the observable universe?

The solution to this puzzle could be a double agent; a particle capable of playing the role of matter or antimatter and introducing a tiny asymmetry in favour of matter. This double agent must fulfil two conditions: it must be an elementary particle, and it must be neutral because electric charge is inverted in the other side of the cosmic mirror. So a neutral double agent candidate could behave as both.

The only particle that meets these requirements is the neutrino. It could mediate reactions leading to a slight excess of electrons and of quarks in the early universe. Thus the balance would be tilted to the matter side and the universe would ┬źsurvive┬╗.

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