Strongly coupled quark gluon plasma (SCQGP)

Abstract

We propose that the reason for the non-ideal behavior seen in lattice simulation of quark gluon plasma (QGP) and relativistic heavy ion collisions (URHICs) experiments is that the QGP near T c and above is strongly coupled plasma (SCP), i.e., strongly coupled quark gluon plasma (SCQGP). It is remarkable that the widely used equation of state (EoS) of SCP in QED (quantum electrodynamics) very nicely fits lattice results on all QGP systems, with proper modifications to include color degrees of freedom and running coupling constant. Results on pressure in pure gauge, 2-flavors and 3-flavors QGP are all can be explained by treating QGP as SCQGP as demonstrated here. Energy density and speed of sound are also presented for all 3 systems. We further extend the model to systems with finite quark mass and a reasonably good fit to lattice results are obtained for (2+1)-flavors and 4-flavors QGP. Hence it is the first unified model, namely SCQGP, to explain the non-ideal QGP seen in lattice simulations with just two system dependent parameters.

Self-consistent quasiparticle model for quark-gluon plasma

“…[1] and with two adjustable parameters, they were were able to fit LGT results of [15] on gluon plasma. However, it fails to fit the more recent LGT results as shown in [11]. Furthermore, Gorenstein and Yang [14] pointed out that there is a thermodynamic (TD) inconsistency in this model and by imposing a stringent constraints, which they called TD consistency relation or the reformulation of statistical mechanics (SM), they tried to solve the problem.…”

“…Many attempts in this line were not completely successful [7,8,9]. Therefore, several phenomenological models with two or more fitting parameters, like confinement models [10], strongly coupled plasma (SCQGP) [11], strongly interacting plasma (sQGP) [12], qQGP [1,2,3,4,5], liquid model [13] and so on, were proposed. By adjusting parameters of the model one may fit the LGT results.…”

Charmonium suppression in the presence of dissipative forces in a strongly-coupled quark–gluon plasma

“…If we calculate p(T )/T 4 versus T for pure gauge, 2-flavor and 3-flavor QGP, a surprisingly good fit with the lattice data was found [33,34].…”

“…Here we propose that the QGP near T c is in fact what is called strongly coupled plasma [33], widely studied in QED plasma where the plasma parameter, Γ, defined as the ratio of the average potential energy to the average kinetic energy of the particles, is of the order of 1 or larger. An extensive study of strong-coupled plasma in QED with proper modifications to include colour degrees of freedom and the strong running coupling constant gives an expression for the energy density as a function of the plasma parameter, Γ…”

“…In Sec.II.A, we briefly describe the strongly-interacting equation of state developed by Bannur [33,34] and determine the pressure, energy density and the speed of sound etc. In Sec.II.B, we then use the aforesaid equation of state to study boost-invariant (1+1) dimensional longitudinal expansion in the presence of viscous forces.…”