Equation of state at non-zero baryon density based on lattice QCD

Pasi Huovinen 1 , Péter Petreczky 2 ,  and Christian Schmidt 3
  • 1 Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438, Frankfurt am Main, Germany
  • 2 Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
  • 3 Fakultät für Physik, Universität Bielefeld, 33615, Bielefeld, Germany


We employ the lattice QCD data on Taylor expansion coefficients to extend our previous parametrization of the equation of state to finite baryon density. When we take into account lattice spacing and quark mass dependence of the hadron masses, the Taylor coefficients at low temperature are equal to those of hadron resonance gas. Parametrized lattice equation of state can thus be smoothly connected to the hadron resonance gas equation of state at low temperatures.

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Open Physics (former Central European Journal of Physics) is a peer-reviewed Open Access journal, devoted to the publication of fundamental research results in all fields of physics.