Overview of the QCD phase diagram: Recent progress from the lattice

In recent years there has been much progress on the investigation of the QCD phase diagram with lattice QCD simulations. In this review we focus on the developments in the last two years. Especially the addition of external influences or new parameter ranges yields an increasing number of interesting results. We discuss the progress for small, finite densities from both extrapolation-based methods (Taylor expansion and analytic continuation for imaginary chemical potential) and complex Langevin simulations, for heavy quark bound states (quarkonium), the dependence on the quark masses (Columbia plot) and the influence of a magnetic field. Many of these conditions are relevant for the understanding of both the QCD transition in the early universe and heavy ion collision experiments, which are conducted for example at the LHC and RHIC.

Automated summary

In recent years, significant progress has been made in investigating the QCD phase diagram using lattice QCD simulations, with a focus on developments in the last two years. The addition of external influences or new parameter ranges has led to an increasing number of interesting results. Discussions include progress for small, finite densities, heavy quark bound states, quark mass dependence, and the influence of magnetic fields.