Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 12: Heavy Ion Collisions and QCD phases

HK 12.8: Talk

Monday, March 16, 2009, 18:45–19:00, H-ZO 10

QCD equation of state from a HTL quasiparticle model — •Robert Schulze — Forschungszentrum Dresden-Rossendorf, Dresden, Germany

We present a quasiparticle model based on a two-loop effective action equipped with hard thermal loop (HTL) dispersion relations and an effective running coupling strength. The model allows for an extrapolation of present QCD lattice results at small or zero chemical potential to larger baryon densities. The resulting QCD equation of state is combined with the hadron sector to arrive at a useable form for hydrodynamical simulations of heavy-ion collisions over a large energy interval. Particular attention is paid to a tachyonic plasmino mode arising in the Landau damping regime, leading to oddities of particle densities and quark partial pressures at small temperatures and medium chemical potential. Implications for quark/neutron stars are discussed.