A free instanton gas random matrix model predicts a singular Dirac spectral peak and a nonvanishing pion-minus-delta susceptibility in the chiral limit of two-flavor hot QCD.
Study of symmetries in finite temperature $N_f=2$ QCD with M\"obius Domain Wall Fermions
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abstract
We report on the ongoing study of symmetry of $N_f=2$ QCD around the critical temperature. Our simulations of $N_f = 2$ QCD employ the M\"obius domain-wall fermion action with residual mass $\sim 1\mbox{MeV}$ or less, maintaining a good chiral symmetry. Using the screening masses from the two point spatial correlators we compare the mass difference between channels connected through various symmetry transformations. Our analysis focuses on restoration of the $SU(2)_L\times SU(2)_R$ as well as anomalously broken axial $U(1)_A$. We also present additional study of a potential $SU(2)_{CS}$ symmetry which may emerge at sufficiently high temperatures.
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$U(1)_A$ Breaking in Hot QCD in the Chiral Limit
A free instanton gas random matrix model predicts a singular Dirac spectral peak and a nonvanishing pion-minus-delta susceptibility in the chiral limit of two-flavor hot QCD.