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End Point of a First-Order Phase Transition in Many-Flavor Lattice QCD at Finite Temperature and Density
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Towards the feasibility study of the electroweak baryogenesis in realistic technicolor scenario, we investigate the phase structure of (2+Nf)-flavor QCD, where the mass of two flavors is fixed to a small value and the others are heavy. For the baryogenesis, an appearance of a first order phase transition at finite temperature is a necessary condition. Using a set of configurations of two-flavor lattice QCD and applying the reweighting method, the effective potential defined by the probability distribution function of the plaquette is calculated in the presence of additional many heavy flavors. Through the shape of the effective potential, we determine the critical mass of heavy flavors separating the first order and crossover regions and find it to become larger with Nf. We moreover study the critical line at finite density and the first order region is found to become wider as increasing the chemical potential. Possible applications to real (2+1)-flavor QCD are discussed.
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First-order phase transitions in the heavy quark region of lattice QCD at high temperatures and high densities
In the heavy quark region of QCD, the phase transition is predicted to become first-order again at very high baryon chemical potential, after first turning into a crossover at moderate density.
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