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

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

2006-11-10

arxiv.org/abs/hep-lat/0611014v1

Nature 443:675-678,2006

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures

Scientific paper

10.1038/nature05120

We determine the nature of the QCD transition using lattice calculations for physical quark masses. Susceptibilities are extrapolated to vanishing lattice spacing for three physical volumes, the smallest and largest of which differ by a factor of five. This ensures that a true transition should result in a dramatic increase of the susceptibilities.No such behaviour is observed: our finite-size scaling analysis shows that the finite-temperature QCD transition in the hot early Universe was not a real phase transition, but an analytic crossover (involving a rapid change, as opposed to a jump, as the temperature varied). As such, it will be difficult to find experimental evidence of this transition from astronomical observations.

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