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A state of matter in which quarks and gluons are freed of their strong attraction for one another under extremely high energy densities.

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How did photons and electrons arise out of the quark-gluon plasma?

The chronology in Wikipedia is emphasizing what is changing in each epoch. Particles that are lighter than the ambient temperature are presumed to be in thermal equilibrium, but not doing much of int …
Ross Millikan's user avatar