Susceptibilities and speed of sound from the Polyakov-Nambu-Jona-Lasinio model

Abstract

We present the Taylor expansion coefficients of the pressure in quark number chemical potential mu(0)=mu(B)/3=mu(u)=mu(d), for the strongly interacting matter as described by the Polyakov-Nambu-Jona-Lasinio (PNJL) model for two light degenerate flavors of quarks u and d. The expansion has been done up to eighth order in mu(0), and the results are consistent with recent estimates from Lattice. We have further obtained the specific heat C-V, squared speed of sound v(s)(2), and the conformal measure C.