Susceptibilities and speed of sound from PNJL 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 PNJL model for two light degenerate flavours of quarks u and d. The expansion has been done upto 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 $\text{cC}$.

Comments: 13 pages, 8 figures, References added, some discussions on Fig. 4 modified, one table added, results unchanged, version to appear in Phys. Rev. D