The QCD equation of state with dynamical quarks

Szabolcs Borsányi; Gergely Endrődi; Zoltán Fodor; Antal Jakovác; Sándor D. Katz; Stefan Krieg; Claudia Ratti; Kálmán K. Szabó

doi:10.1007/JHEP11(2010)077

The QCD equation of state with dynamical quarks

Szabolcs Borsányi, Gergely Endrődi, Zoltán Fodor, Antal Jakovác, Sándor D. Katz, Stefan Krieg, Claudia Ratti, Kálmán K. Szabó

Physics

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661 Scopus citations

Abstract

The present paper concludes our investigation on the QCD equation of state with 2 + 1 staggered flavors and one-link stout improvement. We extend our previous study [JHEP 01 (2006) 089] by choosing even finer lattices. Lattices with N_t = 6, 8 and 10 are used, and the continuum limit is approached by checking the results at N_t = 12. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized. We use physical quark masses, that is, for the lightest staggered pions and kaons we fix the m _π/fK and m_K/fK ratios to their experimental values. The pressure, the interaction measure, the energy and entropy density and the speed of sound are presented as functions of the temperature in the range 100. .. 1000MeV. We give estimates for the pion mass dependence and for the contribution of the charm quark. We compare our data to the equation of state obtained by the "hotQCD" collaboration.

Original language	English (US)
Article number	77
Journal	Journal of High Energy Physics
Volume	2010
Issue number	11
DOIs	https://doi.org/10.1007/JHEP11(2010)077
State	Published - 2010

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1007/JHEP11(2010)077

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title = "The QCD equation of state with dynamical quarks",

abstract = "The present paper concludes our investigation on the QCD equation of state with 2 + 1 staggered flavors and one-link stout improvement. We extend our previous study [JHEP 01 (2006) 089] by choosing even finer lattices. Lattices with Nt = 6, 8 and 10 are used, and the continuum limit is approached by checking the results at Nt = 12. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized. We use physical quark masses, that is, for the lightest staggered pions and kaons we fix the m π/fK and mK/fK ratios to their experimental values. The pressure, the interaction measure, the energy and entropy density and the speed of sound are presented as functions of the temperature in the range 100. .. 1000MeV. We give estimates for the pion mass dependence and for the contribution of the charm quark. We compare our data to the equation of state obtained by the {"}hotQCD{"} collaboration.",

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AU - Borsányi, Szabolcs

AU - Endrődi, Gergely

AU - Fodor, Zoltán

AU - Jakovác, Antal

AU - Katz, Sándor D.

AU - Krieg, Stefan

AU - Ratti, Claudia

AU - Szabó, Kálmán K.

PY - 2010

Y1 - 2010

N2 - The present paper concludes our investigation on the QCD equation of state with 2 + 1 staggered flavors and one-link stout improvement. We extend our previous study [JHEP 01 (2006) 089] by choosing even finer lattices. Lattices with Nt = 6, 8 and 10 are used, and the continuum limit is approached by checking the results at Nt = 12. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized. We use physical quark masses, that is, for the lightest staggered pions and kaons we fix the m π/fK and mK/fK ratios to their experimental values. The pressure, the interaction measure, the energy and entropy density and the speed of sound are presented as functions of the temperature in the range 100. .. 1000MeV. We give estimates for the pion mass dependence and for the contribution of the charm quark. We compare our data to the equation of state obtained by the "hotQCD" collaboration.

AB - The present paper concludes our investigation on the QCD equation of state with 2 + 1 staggered flavors and one-link stout improvement. We extend our previous study [JHEP 01 (2006) 089] by choosing even finer lattices. Lattices with Nt = 6, 8 and 10 are used, and the continuum limit is approached by checking the results at Nt = 12. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized. We use physical quark masses, that is, for the lightest staggered pions and kaons we fix the m π/fK and mK/fK ratios to their experimental values. The pressure, the interaction measure, the energy and entropy density and the speed of sound are presented as functions of the temperature in the range 100. .. 1000MeV. We give estimates for the pion mass dependence and for the contribution of the charm quark. We compare our data to the equation of state obtained by the "hotQCD" collaboration.

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