Physical interpretation of the dressed Polyakov loop in the Nambu--Jona-Lasinio model

Abstract

We investigate the rapid rise of the dressed Polyakov loop in the Nambu--Jona-Lasinio (NJL) model as a function of temperature. In QCD such a behaviour is interpreted as a confinement- deconfinement phase transition. However, we demonstrate that in the NJL model this is simply a remnant of the chiral transition.

Comments: Changes in text, title and abstract. Version accepted by PRD