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 - Funding Information:
∗Speaker. †Present address: Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA ‡This work has been supported in part by contracts DE-AC02-98CH10886 and DE-FC02-06ER-41439 with the U.S. Department of Energy and contract 0555397 with the National Science Foundation. The numerical calculations have been performed using the USQCD resources at Fermilab and JLab, the BlueGene/L at the New York Center for Computational Sciences (NYCCS) and the BlueGene/L at the Jülich Supercomputing Center. We thank Z. Fodor and S. Katz for sending us the stout data.
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
VL - 105
JO - Proceedings of Science
JF - Proceedings of Science
SN - 1824-8039
T2 - 28th International Symposium on Lattice Field Theory, Lattice 2010
Y2 - 14 June 2010 through 19 June 2010
ER -