Seminar in Hadronic Physics

Lattice based Equation of State and its effect on the hydrodynamical evolution

Pasi Huovinen

Goethe University

At low temperatures the hadron resonance gas model is expected to give a fair description of thermodynamic quantities even if the lattice QCD calculation leads to significantly different result. In this talk I show that the discrepancies are significantly reduced if we take into account the larger values of quark mass, i.e. larger hadron masses, used in lattice calculations as well as the finite spacing errors. Thus, I propose that below the critical temperature, T_c, the physical EoS is close to the hadron resonance gas EoS, and present a parametrization interpolating consistently between hadron resonance gas EoS below and lattice EoS above T_c. In the second part of the talk I show how such an Equation of State affects the evolution of the system and compare it with old calculations done using an Equation of State with a first order phase transition.