TY - JOUR
T1 - Towards a QCD equation of state with 2+1+1 flavors using the HISQ action
AU - MILC Collaboration
AU - Bazavov, A.
AU - Bernard, C.
AU - DeTar, C.
AU - Foley, J.
AU - Gottlieb, Steven
AU - Heller, Urs M.
AU - Hetrick, J. E.
AU - Laiho, J.
AU - Levkova, L.
AU - Osborn, J.
AU - Sugar, R.
AU - Toussaint, D.
AU - Van De Water, R. S.
AU - Zhou, R.
N1 - Funding Information:
Computations for this work were carried out with resources provided by the USQCD Collaboration, the Argonne Leadership Computing Facility, and the National Energy Research Scientific Computing Center, which are funded by the Office of Science of the U.S. Department of Energy; and with resources provided by the National Center for Atmospheric Research, the National Institute for Computational Science, the Pittsburgh Supercomputer Center, the San Diego Supercomputer Center, and the Texas Advanced Computer Center, which are funded through the National Science Foundation’s XSEDE Program. This work was supported in part by the U.S. Department of Energy under Grants DE-FG02-91ER-40628, DE-FG02-91ER-40661, DE-FG02-04ER-41298, and DE-FC02-06ER41446; and by the National Science Foundation under Grants PHY07-57333, PHY07-03296, PHY07-57035, PHY09-03571, PHY09-70137, and PHY10-67881. This manuscript has been co-authored by an employee of Brookhaven Science Associates, LLC, under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
PY - 2012
Y1 - 2012
N2 - We present first, preliminary results for the QCD equation of state with 2+1+1 flavors of highly improved staggered quarks (HISQ), that is, including the effects of a dynamical charm quark. This first study uses a line of constant physics (LCP) with the light-quark mass at ml = ms/5 and physical strange- and charm-quark masses. With increasing temperature, the effects of the charm quark, as in earlier partially quenched studies, start to be visible at temperatures where the equation of state is becoming insensitive to the value of the light (up/down) quark mass.
AB - We present first, preliminary results for the QCD equation of state with 2+1+1 flavors of highly improved staggered quarks (HISQ), that is, including the effects of a dynamical charm quark. This first study uses a line of constant physics (LCP) with the light-quark mass at ml = ms/5 and physical strange- and charm-quark masses. With increasing temperature, the effects of the charm quark, as in earlier partially quenched studies, start to be visible at temperatures where the equation of state is becoming insensitive to the value of the light (up/down) quark mass.
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M3 - Conference article
AN - SCOPUS:85030110487
SN - 1824-8039
VL - Part F130497
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 063
T2 - 30th International Symposium on Lattice Field Theory, Lattice 2012
Y2 - 24 June 2012 through 29 June 2012
ER -