The equation of state for two flavor QCD at N_t=6

C. DeTar; D. Toussaint; J. E. Hetrick; L. Karkkainen; M. Wingate; R. L. Sugar; R. Rummukainen; S. Gottlieb; T. Blum; The MILC Collaboration: C. W. Bernard

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The equation of state for two flavor QCD at N_t=6

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arxiv hep-lat/9612025 v1 pith:7JAMTYKT submitted 1996-12-21 hep-lat

The MILC Collaboration: C. W. Bernard , T. Blum , C. Detar , S. Gottlieb , U. M. Heller , J. E. Hetrick , L. Karkkainen , R. Rummukainen

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R. L. Sugar D. Toussaint M. Wingate

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We calculate the two flavor equation of state for QCD on lattices with lattice spacing a=(6T)^{-1} and find that cutoff effects are substantially reduced compared to an earlier study using a=(4T)^{-1}. However, it is likely that significant cutoff effects remain. We fit the lattice data to expected forms of the free energy density for a second order phase transition at zero-quark-mass, which allows us to extrapolate the equation of state to m_q=0 and to extract the speed of sound. We find that the equation of state depends weakly on the quark mass for small quark mass.

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