The aim of high energy heavy ion physics is to study strong interacting matter at extreme energy densities. QCD predicts that, an sufficiently high energy density, there will be a phase transition from hadron matter to a plasma of deconfined quarks and gluons called a Quark-Glu Plasma(QGP). Such a phase transition would have taken place in the ea Universe some 10-5 seconds after the Big Bang and may still play a role in the core of collapsing neutron stars.
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