Equation of state for two flavor QCD at [Formula presented]

Claude Bernard, Tom Blum, Carleton DeTar, Steven Gottlieb, Kari Rummukainen, Urs M. Heller, James E. Hetrick, Doug Toussaint, Leo Kärkkäinen, R. L. Sugar, Matthew Wingate

Research output: Contribution to journalArticle

115 Scopus citations


We calculate the two flavor equation of state for QCD on lattices with lattice spacing [Formula presented] and find that cutoff effects are substantially reduced compared to an earlier study using [Formula presented]. 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 [Formula presented] and to extract the speed of sound. We find that the equation of state depends weakly on the quark mass for small quark mass.

Original languageEnglish (US)
Pages (from-to)6861-6869
Number of pages9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Bernard, C., Blum, T., DeTar, C., Gottlieb, S., Rummukainen, K., Heller, U. M., Hetrick, J. E., Toussaint, D., Kärkkäinen, L., Sugar, R. L., & Wingate, M. (1997). Equation of state for two flavor QCD at [Formula presented]. Physical Review D - Particles, Fields, Gravitation and Cosmology, 55(11), 6861-6869. https://doi.org/10.1103/PhysRevD.55.6861