New Critical Point Induced by the Axial Anomaly in Dense QCD
Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto, Gordon Baym
Abstract
We study the interplay between chiral and diquark condensates within the framework of the Ginzburg-Landau free energy, and classify possible phase structures of two and three-flavor massless QCD. The QCD axial anomaly acts as an external field applied to the chiral condensate in a color superconductor and leads to a crossover between the broken chiral symmetry and the color superconducting phase, and, in particular, to a new critical point in the QCD phase diagram.
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