München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 58: Theorie
HK 58.8: Vortrag
Freitag, 24. März 2006, 15:45–16:00, B
Lattice QCD based Equation of State within a Quasi-Particle Perspective — •Marcus Bluhm1, Robert Schulze2, Daniel Seipt2, and Burkhard Kämpfer1,2 — 1Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany — 2Institut für Theoretische Physik, TU Dresden, 01062 Dresden, Germany
The equation of state of strongly interacting matter is of significant importance in the hydrodynamical description of heavy ion collisions. We construct the equation of state within our quasi-particle model relating pressure, energy density, baryon number density and susceptibilities in agreement with first principle evaluations, i. e. QCD lattice calculations of the Bielefeld-Swansea group and of Gavai and Gupta. In the quasi-particle model, the excitation spectrum of quasi-particles is based on an extension of HTL/HDL selfenergies of propagating quark and gluon modes. Although lattice results are restricted to rather large quark masses, a possible chiral extrapolation within our model is discussed. As an example, we examine the equation of state for small baryon number densities relevant for experiments at RHIC and LHC and study its impact on azimuthal anisotropy in heavy ion collisions. The inclusion of critical end point effects is also discussed.