Hadron-quark phase transition in a hadronic and Polyakov--Nambu--Jona-Lasinio models perspective

摘要

In this work we study the hadron-quark phase transition matching relativistichadrodynamical mean-field models (in the hadronic phase) with the more updatedversions of the Polyakov-Nambu-Jona-Lasinio models (on the quark side).Systematic comparisons are performed showing that the predicted hadronic phasesof the matching named as RMF-PNJL, are larger than the confined phase obtainedexclusively by the Polyakov quark models. This important result is due to theeffect of the nuclear force that causes more resistance of hadronic matter toisothermal compressions. For sake of comparison, we also obtain the matchingsof the hadronic models with the MIT bag model, named as RMF-MIT, showing thatit presents always larger hadron regions, while shows smaller mixed phases thanthat obtained from the RMF-PNJL ones. Thus, studies of the confinementtransition in nuclear matter, done only with quark models, still need nucleardegrees of freedom to be more reliable in the whole $T\times\mu$ phase diagram.