Which chiral symmetry is restored in hot QCD?

Abstract

We review the current status of the problem of chiral symmetry restoration, discussing an open question of whether at the $SU(N_f{)}_A$ restoration point $T=T_c$ the $U(1{)}_A$ chiral symmetry is or is not (approximately) restored. New lattice and instanton-based studies are considered, and some new calculations are suggested to clarify the issue. We also speculate on possible experimental manifestations of two possible scenarios.

Cited by in corpus (10)

• The phase diagram of dense QCD
• Theta dependence of SU(N) gauge theories in the presence of a topological term
• Weinberg-Type Sum Rules at Zero and Finite Temperature
• Non-Abelian Global Vortices
• Fate of the ${\eta }^{\prime }$ in the Quark Gluon Plasma
• Domain Wall Bubbles in High Energy Heavy Ion Collisions
• Interplay between $SU(N_f)$ chiral symmetry, $U(1{)}_A$ axial anomaly and massless bosons
• QCD transition at the physical point, and its scaling window from twisted mass Wilson fermions
• Finite temperature QCD with $N_f=2+1+1$ Wilson twisted mass fermions at physical pion, strange and charm masses
• Gliding down the QCD transition line, from $N_f=2$ till the onset of conformality