The order of the quantum chromodynamics transition predicted by the standard model of particle physics

  title={The order of the quantum chromodynamics transition predicted by the standard model of particle physics},
  author={Yasumichi Aoki and Gergely Endrődi and Zolt{\'a}n Fodor and S{\'a}ndor D. Katz and K{\'a}lm{\'a}n K. Szab{\'o}},
Quantum chromodynamics (QCD) is the theory of the strong interaction, explaining (for example) the binding of three almost massless quarks into a much heavier proton or neutron—and thus most of the mass of the visible Universe. The standard model of particle physics predicts a QCD-related transition that is relevant for the evolution of the early Universe. At low temperatures, the dominant degrees of freedom are colourless bound states of hadrons (such as protons and pions). However, QCD is… 
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