Speaker
Description
We report recent results on the finite-temperature chiral phase transition in (2+1)-flavor QCD with physical quark masses, using the Möbius domain wall fermion (MDWF) action to preserve chiral symmetry to a high precision. Our simulations cover a temperature range from 140 to 250 MeV for two lattice spacings, corresponding to temporal extents of $N_t = 12$ and $16$, with aspect ratios $N_s/N_t$ between 3 and 4. This setup allows us to control for finite-volume and discretization effects. The chiral condensate for domain wall fermions contains ultraviolet-divergent contributions stemming from the finite input quark mass and residual chiral symmetry breaking. We will discuss our method for subtracting these contributions to obtain a renormalized chiral condensate. Our result shows that the disconnected chiral susceptibility develops a pronounced peak whose height does not increase with increasing volume. This suggests that the transition is a smooth crossover rather than first-order. We will report the pseudo-critical temperature and its dependence on the lattice spacing.
| Parallel Session (for talks only) | QCD at nonzero temperature and density |
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