Search of QCD phase transition points in the canonical approach of the NJL model

Abstract

We study the Lee-Yang zeros in the canonical approach to search phase transition points at finite temperature and density in the Nambu-Jona-Lasinio (NJL) model as an effective model of QCD. The canonical approach is a promising method to avoid the sign problem in lattice QCD at finite density. We find that a set of Lee-Yang zeros computed with finite degrees of freedom can be extrapolated to those with infinite degrees of freedom, providing the correct phase transition point. We propose the present method as a useful method for actual lattice simulations for QCD. Keywords: QCD phase, Finite density, Canonical approach, Imaginary chemical potential, Nambu-Jona-Lasinio model