Equation of state in 2+1 flavor QCD with improved Wilson quarks by the fixed scale approach

2012/02/29 by T. Umeda, S. Aoki, S. Ejiri +4 · 1 citation
Physics and Astronomy · #hep-lat

paper · pdf · doi:10.1103/physrevd.85.094508

published as Phys. Rev. D 85, 094508 (2012) · 14 pages, 12 figures, v2: Table I and Figure 3 are corrected, reference updated. Main discussions and conclusions are unchanged, v3: version to appear in PRD, v4: reference added

arxiv created 2012/06/19 · arxiv updated 2012/06/20

Abstract

We study the equation of state in 2+1 flavor QCD with nonperturbatively improved Wilson quarks coupled with the RG-improved Iwasaki glue. We apply the T-integration method to nonperturbatively calculate the equation of state by the fixed-scale approach. With the fixed-scale approach, we can purely vary the temperature on a line of constant physics without changing the system size and renormalization constants. Unlike the conventional fixed-N_t approach, it is easy to keep scaling violations small at low temperature in the fixed scale approach. We study 2+1 flavor QCD at light quark mass corresponding to m_π/m_ρ≃ 0.63, while the strange quark mass is chosen around the physical point. Although the light quark masses are heavier than the physical values yet, our equation of state is roughly consistent with recent results with highly improved staggered quarks at large N_t.

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• Anomalous Thermal Dimension and the Enthalpy Renormalization Group Flow in QCD

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