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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?

Gluons and quark-antiquark pairs, like photons and lepton-antilepton pairs, are excitations of the vacuum. Any volume of space with enough energy density to contain a quark-gluon plasma also has, by d …
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