An improved lattice QCD equation of state, combined with entropy contours continued from imaginary chemical potential, excludes a QCD critical point below μB = 450 MeV at 2σ confidence.
QCD simulations at small chemical potential
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Within the reweighting approach, one has the freedom to choose the Monte Carlo action so that it provides a good overlap with the finite-\mu measure but remains simple to simulate. We explore several choices of action in the regime of small \mu. Simulating with a finite isospin chemical potential \mu_I=\mu gives a better overlap than the standard choice \mu=0, with no computational overhead.
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Lattice QCD constraints on the critical point from an improved precision equation of state
An improved lattice QCD equation of state, combined with entropy contours continued from imaginary chemical potential, excludes a QCD critical point below μB = 450 MeV at 2σ confidence.