TY - JOUR
T1 - Taste symmetry and QCD thermodynamics with improved staggered fermions
AU - HotQCD Collaboration
AU - Bazavov, Alexei
AU - Petreczky, Peter
AU - Bazavov, A.
AU - Bhattacharya, T.
AU - Cheng, M.
AU - Christ, N. H.
AU - DeTar, C.
AU - Gottlieb, S.
AU - Gupta, R.
AU - Hegde, P.
AU - Heller, U. M.
AU - Jung, C.
AU - Karsch, F.
AU - Laermann, E.
AU - Levkova, L.
AU - Miao, C.
AU - Mawhinney, R. D.
AU - Mukherjee, S.
AU - Petreczky, P.
AU - Renfrew, D.
AU - Schmidt, C.
AU - Soltz, R. A.
AU - Soeldner, W.
AU - Sugar, R.
AU - Toussaint, D.
AU - Unger, W.
AU - Vranas, P.
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
PY - 2010
Y1 - 2010
N2 - Taste symmetry violations in staggered fermion formulations correlate strongly with the cut-off (lattice spacing) dependence in thermodynamic quantities. Better taste symmetry on the lattice can be achieved either by decreasing the lattice spacing and going to larger temporal extent in finite-temperature calculations, or by further improving the action. The highly improved staggered quark (HISQ) action offers a further degree of improvement and substantially reduces taste violations. We report on our studies of the 2+1 flavor QCD thermodynamics with the HISQ/tree action. By systematically comparing HISQ/tree, asqtad, p4 and stout calculations we quantify how the cut-off effects manifest themselves in different thermodynamic quantities, including the renormalized Polyakov loop, chiral condensate, various fluctuations and correlations of conserved charges. The implications for the equation of state and a comparison to the hadron resonance gas model are also discussed. The chiral aspects of the finite-temperature transition are discussed in the companion HotQCD contribution [1].
AB - Taste symmetry violations in staggered fermion formulations correlate strongly with the cut-off (lattice spacing) dependence in thermodynamic quantities. Better taste symmetry on the lattice can be achieved either by decreasing the lattice spacing and going to larger temporal extent in finite-temperature calculations, or by further improving the action. The highly improved staggered quark (HISQ) action offers a further degree of improvement and substantially reduces taste violations. We report on our studies of the 2+1 flavor QCD thermodynamics with the HISQ/tree action. By systematically comparing HISQ/tree, asqtad, p4 and stout calculations we quantify how the cut-off effects manifest themselves in different thermodynamic quantities, including the renormalized Polyakov loop, chiral condensate, various fluctuations and correlations of conserved charges. The implications for the equation of state and a comparison to the hadron resonance gas model are also discussed. The chiral aspects of the finite-temperature transition are discussed in the companion HotQCD contribution [1].
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M3 - Conference article
AN - SCOPUS:85055325735
SN - 1824-8039
VL - 105
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 28th International Symposium on Lattice Field Theory, Lattice 2010
Y2 - 14 June 2010 through 19 June 2010
ER -