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The question inspired by an upcoming colloquim at UCB.

A naive interpretation of quark asymptotic freedom seems to imply that at high enough energies they should be weakly interacting. On the other hand, the quark-gluon plasma accessible experimentally via heavy ion collisions is claimed to be close to an ideal liquid. There is also a lot of excitement about this because of AdS/CFT correspondence (see this and related questions at Physics.SE).

Shouldn't the quark-gluon matter phase diagram be close to an ideal gas at least in some low-density & high-temperature region? In other words, is quasi-independent quark gas picture of QCD ever valid? And is there a simple reason why?

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I'm not an expert on QGP, but you need high energy and short distance scales (lest confinement come to bite you) for asymptotic freedom, so high temperature and high density... –  dmckee Oct 7 '11 at 17:05
    
Aha, that starts to makes sense: high density inevitably brings us close to a liquid. Would be great to have an argument for scattering length being same order of magnitude as mean free path, that would justify the liquid phase. –  Slaviks Oct 7 '11 at 17:27
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