Abstract
We study the quark-hadron phase transition by using a three flavor Nambu-Jona-Lasinio model with the Polyakov loop at zero chemical potential, extending our previous work with two flavor model. We show that the equation of state at low temperatures is dominated by pions and kaons as collective modes of quarks and anti-quarks. As temperature increases, mesonic collective modes melt into the continuum of quark and anti-quark so that hadronic phase changes continuously to the quark phase where quark excitations dominate pressure.
Highlights
Studying the quark-hadron phase transition is one of the most fundamental problem in modern nuclear physics
Many works have been done on the QCD phase transitions by effective models and lattice calculations, there are still many uncertainties especially in the intermediate region between hadronic phase and quark phase
We study the quark-hadron phase transition by using a three flavor PNJL model which contains the 1 order parameters of both the chiral phase transition and the de-confining phase transition
Summary
Studying the quark-hadron phase transition is one of the most fundamental problem in modern nuclear physics. Many works have been done on the QCD phase transitions by effective models and lattice calculations, there are still many uncertainties especially in the intermediate region between hadronic phase and quark phase. The goal of this work is to study the behavior of the equation of state in order to investigate how the degrees of freedom change from those of hadrons to quarks and gluons with increasing temperature. We work with an effective model written in quark and anti-quark fields and take into account correlations between quarks and anti-quarks to describe mesons. We present a brief account of the results of calculations, extending our previous work with the two flavor model[2], with strangeness degree of freedom. Full account of this work will be reported elsewhere[3]
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