Speaker
Description
This talk presents the results of lattice simulations of quantum chromodynamics (QCD) above the crossover temperature and at unprecedentedly high baryon densities. Lattice QCD calculations at finite chemical potential suffer from the sign problem, which prevents the use of conventional importance-sampling methods such as the Hybrid Monte Carlo algorithm. In this study, the Complex Langevin equation is employed to circumvent this problem. The simulations are performed at the physical point, and the results are extrapolated to the continuum limit. In particular, we determine the QCD equation of state by computing thermodynamic observables, including the baryon density, pressure, energy density, entropy density, trace anomaly, and speed of sound, as functions of the baryon chemical potential and temperature. Potential issues related to incorrect convergence of the Complex Langevin dynamics are under control, and we find agreement with previous lattice studies at lower chemical potentials, as well as with perturbative hard-thermal-loop calculations at high temperatures.