Equation of state and QCD transition at finite temperature

A. Bazavov, T. Bhattacharya, M. Cheng, N. H. Christ, C. Detar, S. Ejiri, Steven Gottlieb, R. Gupta, U. M. Heller, K. Huebner, C. Jung, F. Karsch, E. Laermann, L. Levkova, C. Miao, R. D. Mawhinney, P. Petreczky, C. Schmidt, R. A. Soltz, W. SoeldnerR. Sugar, D. Toussaint, P. Vranas

Research output: Contribution to journalArticle

478 Scopus citations

Abstract

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 Nτ=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(a2) 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 Nτ=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.

Original languageEnglish (US)
Article number014504
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume80
Issue number1
DOIs
StatePublished - Aug 6 2009

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Equation of state and QCD transition at finite temperature'. Together they form a unique fingerprint.

  • Cite this

    Bazavov, A., Bhattacharya, T., Cheng, M., Christ, N. H., Detar, C., Ejiri, S., Gottlieb, S., Gupta, R., Heller, U. M., Huebner, K., Jung, C., Karsch, F., Laermann, E., Levkova, L., Miao, C., Mawhinney, R. D., Petreczky, P., Schmidt, C., Soltz, R. A., ... Vranas, P. (2009). Equation of state and QCD transition at finite temperature. Physical Review D - Particles, Fields, Gravitation and Cosmology, 80(1), [014504]. https://doi.org/10.1103/PhysRevD.80.014504