# Isentropic equation of state of 2-flavor QCD

Ejiri S, Karsch F, Laermann E, Schmidt C (2006)

PHYSICAL REVIEW D 73(5).

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Using Taylor expansions of the pressure obtained previously in studies of 2-flavor QCD at nonzero chemical potential we calculate expansion coefficients for the energy and entropy densities up to O(mu(6)(q)) in the quark chemical potential. We use these series in mu(q)/T to determine lines of constant entropy per baryon number (S/N-B) that characterize the expansion of dense matter created in heavy ion collisions. In the high temperature regime these lines are found to be well approximated by lines of constant mu(q)/T. In the low temperature phase, however, the quark chemical potential is found to increase with decreasing temperature. This is in accordance with resonance gas model calculations. Along the lines of constant S/N-B we calculate the energy density and pressure. Within the accuracy of our present analysis we find that the ratio p/epsilon for T > T-0 as well as the softest point of the equation of state, (p/epsilon)(min)similar or equal to 0.075, show no significant dependence on S/N-B.

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Ejiri S, Karsch F, Laermann E, Schmidt C. Isentropic equation of state of 2-flavor QCD.

*PHYSICAL REVIEW D*. 2006;73(5).Ejiri, S., Karsch, F., Laermann, E., & Schmidt, C. (2006). Isentropic equation of state of 2-flavor QCD.

*PHYSICAL REVIEW D*,*73*(5). doi:10.1103/PhysRevD.73.054506Ejiri, S., Karsch, F., Laermann, E., and Schmidt, C. (2006). Isentropic equation of state of 2-flavor QCD.

*PHYSICAL REVIEW D*73.Ejiri, S., et al., 2006. Isentropic equation of state of 2-flavor QCD.

*PHYSICAL REVIEW D*, 73(5). S. Ejiri, et al., “Isentropic equation of state of 2-flavor QCD”,

*PHYSICAL REVIEW D*, vol. 73, 2006. Ejiri, S., Karsch, F., Laermann, E., Schmidt, C.: Isentropic equation of state of 2-flavor QCD. PHYSICAL REVIEW D. 73, (2006).

Ejiri, S, Karsch, Frithjof, Laermann, Edwin, and Schmidt, Christian. “Isentropic equation of state of 2-flavor QCD”.

*PHYSICAL REVIEW D*73.5 (2006).
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