The axial anomaly and the phases of dense QCD

Abstract

The QCD axial anomaly, by coupling the chiral condensate and BCS pairing fields of quarks in dense matter, leads to a new critical point in the QCD phase diagram \cite{HTYB,chiral2}, which at sufficiently low temperature should terminate the line of phase transitions between chirally broken hadronic matter and color superconducting quark matter. The critical point indicates that matter at low temperature should cross over smoothly from the hadronic to the quark phase, as suggested earlier on the basis of symmetry. We review here the arguments, based on a general Ginzburg-Landau effective Lagrangian, for the existence of the new critical point, as well as discuss possible connections between the QCD phase structure and the BEC-BCS crossover in ultracold trapped atomic fermion systems at unitarity. and implications for the presence of quark matter in neutron stars.

8 pages, Proceedings of Quark Matter 2008, Jaipur

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Cited by in corpus (6)

• Astrophysical Measurement of the Equation of State of Neutron Star Matter
• Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions
• The role of strangeness in hybrid stars and possible observables
• Role of two-flavor color superconductor pairing in a three-flavor Nambu--Jona-Lasinio model with axial anomaly
• Roles of axial anomaly on neutral quark matter with color superconducting phase
• Large N Expansion for Strongly-coupled Boson-Fermion Mixtures