Complex Langevin dynamics for dynamical QCD at nonzero chemical potential: a comparison with multi-parameter reweighting
Abstract
We study lattice QCD at non-vanishing chemical potential using the complex Langevin equation. We compare the results with multi-parameter reweighting both from μ=0 and phase quenched ensembles. We find a good agreement for lattice spacings below ≈0.15 fm. On coarser lattices the complex Langevin approach breaks down. Four flavors of staggered fermions are used on Nt=4, 6 and 8 lattices. For one ensemble we also use two flavors to investigate the effects of rooting.
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