Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free.

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?

share|improve this question
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.