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The early universe is perhaps the best conceivable multi-particle system in nature, for which the degrees of freedom are those of the Standard Model. This elementary particle plasma traced a path through its phase diagram, while evolving, that was largely determined by the underlying symmetries of the theory. Another trajectory, through the same phase diagram, is followed in a central collision between two heavy nuclei at high energies. Fortunately, theoretical methods developed and tested fordoi:10.24442/boristheses.2185 fatcat:ve2qzrtr6nfzzmkbe3kjuiztkm