Recent thermodynamic results from lattice QCD analyzed within a quasi-particle model

2011/03/31 by Salvatore Plumari, Wanda M. Alberico, Vincenzo Greco +1 · 1 citation
Physics and Astronomy · #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevd.84.094004

18 pages, 9 figures; version accepted in Phys. Rev.D; calculation with relaxation time τ\sim g^4 ln g has been added

arxiv created 2011/10/04 · arxiv updated 2015/05/27

Abstract

The thermodynamic behavior of QCD matter at high temperature is currently studied by lattice QCD theory. The main features are the fast rise of the energy density ε around the critical temperature T_c and the large trace anomaly of the energy momentum tensor < Θ_μ^μ>=ε- 3 P which hints at a strongly interacting system. Such features can be accounted for by employing a massive quasi-particle model with a temperature-dependent bag constant. Recent lattice QCD calculations with physical quark masses by the Wuppertal-Budapest group have shown a slower increase of ε and a smaller <Θ_μ^μ> peak with respect to previous results from the hotQCD collaboration. We investigate the implications of such differences from the point of view of a quasi-particle model, also discussing light and strange quark number susceptibilities. Furthermore, we predict the impact of these discrepancies on the temperature-dependence of the transport properties of matter, like the shear and bulk viscosities.

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