quark–gluon plasma

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A state of matter in which quarks and gluons are not confined into baryons and mesons but exist as a hot plasma. It is thought that this state existed in the early universe until there was a phase transition about 10−5 s after the big bang, when the universe had cooled to a sufficiently low temperature that quark confinement into hadrons occurred. This state was created in the laboratory in the early years of the twenty-first century.

Subjects: Physics.

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