Equation of state in (2+1) flavor QCD at hightemperatures

We present results for the equation of state in ( 2 + 1 )-flavor QCD using the highly improved staggered quark action and lattices with temporal extent N τ = 6 , 8, 10, and 12. We show that these data can be reliably extrapolated to the continuum limit and obtain a number of thermodynamic quantities and the speed of sound in the temperature range 130–400 MeV. We compare our results with previous calculations and provide an analytic parameterization of the pressure, from which other thermodynamic quantities can be calculated, for use in phenomenology. We show that the energy density in the crossover region, 145 MeV ≤ T ≤ 163 MeV , defined by the chiral transition, is e c = ( 0.18 – 0.5 ) GeV / fm 3 , i.e., ( 1.2 – 3.1 ) e nuclear . At high temperatures, we compare our results with resummed and dimensionally reduced perturbation theory calculations. As a byproduct of our analyses, we obtain the values of the scale parameters r 0 from the static quark potential and w 0 from the gradient flow.

• Publication year

  2009

• Venue

  Proceedings of XIII Quark Confinement and the Hadron Spectrum — PoS(Confinement2018)

• Publication date

  2009-09-28

• Fields of study

  Physics

• Identifiers
  DOI 10.1103/PhysRevD.85.094508arXiv 1811.12902
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  Open on Semantic Scholar

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