Equation of state and QCD transition at finite temperature
By A. Bazavov, Tanmoy Bhattacharya, M. Cheng, N. Christ, C. DeTar, S. Ejiri, S. Gottlieb, R. Gupta, U. Heller, K. Huebner and 13 more. 2009
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We calculate the equation of state in $2+1$ flavor QCD at finite temperature with physical strange quark mass and almost physical light quark masses using lattices with temporal extent ${N}_{\ensuremath{\tau}}=8$. Calculations have been performed with two different improved staggered fermion actions, the asqtad and p4 actions. Overall, we find good agreement between results obtained with these two $O({a}^{2})$ improved staggered fermion discretization schemes. A comparison with earlier calculations on coarser lattices is performed to quantify systematic errors in current studies of the equation of state. We also present results for observables that are sensitive to deconfining and chiral aspects of the QCD transition on ${N}_{\ensuremath{\tau}}=6$ and 8 lattices. We find that deconfinement and chiral symmetry restoration happen in the same narrow temperature interval. In an appendix we present a simple parametrization of the equation of state that can easily be used in hydrodynamic model calculations. In this parametrization we include an estimate of current uncertainties in the lattice calculations which arise from cutoff and quark mass effects.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/7a4463da309073a177ccb4d714c774a822ac0763
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In Nuclear and High Energy Physics
Citations in the corpus
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- Gauge/String Duality, Hot QCD and Heavy Ion Collisions (2011, background): “It is striking that even though we have deliberately been conservative in making this underestimate, we have found an energy density that is about five times larger than the QCD critical energy density εc ≈ 1 GeV/fm3, where the crossover from hadronic matter to quark-gluon plasma occurs, according t”
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