A QCD phase transition in the early universe could have left inhomogeneities in the baryon to photon ratio and in isospin that might have affected nucleosynthesis later on. At very high temperature QCD plasma can be described by perturbation theory because of asymptotic freedom, but a possible phase transition requires a nonperturbative approach like lattice gauge theory. Assuming that a first order transition did occur, a dynamical set of equations can be solved to evolve the universe through it and to quantify the scale of inhomogeneity. Unfortunately this scale appears to be too small by two orders of magnitude to affect nucleosynthesis.
CITATION STYLE
Kapusta, J. I. (2001). Quark-Gluon Plasma in the Early Universe. In Phase Transitions in the Early Universe: Theory and Observations (pp. 103–121). Springer Netherlands. https://doi.org/10.1007/978-94-010-0997-3_4
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