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Once produced in relativistic heavy-ion collisions, quark-gluon plasma undergoes a nonequilibrium phase of expansion, characterized by a thermalization time. Using a class of more realistic (nonconformal) holographic models inspired from lattice QCD, the authors study this regime, and find that the thermalization time seems to depend only on the speed of sound.
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Janik et al. (2015) studied this question.
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