Axial U(1) symmetry, topology, and Dirac spectra at high temperature in $N_f=2$ lattice QCD

Abstract

Using lattice QCD simulations with $N_f=2$ dynamical fermions, we study the axial $U(1)$ symmetry, topological charge, and Dirac eigenvalue spectra in the high-temperature phase in which the chiral symmetry is restored. Our gauge ensembles are generated with Möbius domain-wall fermions, but the measurements such as susceptibilities are reweighted to those for the overlap fermions by using overlap/domain-wall reweighting technique. We find that the $U(1{)}_A$ and topological susceptibilities are strongly suppressed in the small quark mass region, which is related to the reduction of chiral-zero and low-nonzero modes on the Dirac spectra. We also examine their volume dependence.

10 pages, 4 figures, 1 table; Proceedings of The 9th International Workshop on Chiral Dynamics (CD18), 17-21 September, 2018, Durham, NC, USA. arXiv admin note: text overlap with arXiv:1812.06621

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Cited by in corpus (8)

• Sp(4) gauge theories on the lattice: Quenched fundamental and antisymmetric fermions
• Study of the axial U(1) anomaly at high temperature with lattice chiral fermions
• Topological susceptibility, divergent chiral density and phase diagram of chirally imbalanced QCD medium at finite temperature
• Localization with overlap fermions
• Analysis on nonperturbative flavor violation at chiral crossover criticality in QCD
• Nonperturbative Flavor Breaking in Topological Susceptibility at Chiral Crossover
• Axial U(1) symmetry and mesonic correlators at high temperature in $N_f=2$ lattice QCD
• Symmetries of the light hadron spectrum in high temperature QCD