The qcd phase diagram

In recent years many efforts have been devoted to the search for the Quark Gluon Plasma, a new, deconfined phase of hadronic matter, through ultrarelativistic heavy ion collisions. In 1986 the Alternate Gradient Synchrotron in Brookhaven started accelerating nuclei, thus beginning the Era of high energy nucleus-nucleus collisions. Since then, many experiments developed, with increasing luminosity and energy of the ion beams: the Large Hadron Collider, expected to be completed by 2007 at CERN will allow to study Pb-Pb collisions at y/s ~ 5.5 TeV/nucleon....

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The topological Lifshitz phase transition is studied systematically within an effective model of QCD, in which the chiral symmetry, broken at zero temperature, is not restored at high temperature and/or baryon chemical potential. It is found that during phase transition the quark system undergoes a first-order transition from low density fully-gapped state to high density state with Fermi sphere which is protected by momentum-space topology. The Lifshitz phase diagram in the plane of temperature and baryon chemical potential is established.

12p thuyliebe 12-10-2018 23 0   Download