The Equation of state for two flavor QCD at finite density

Ejiri S, Allton CR, Hands SJ, Kaczmarek O, Karsch F, Laermann E, Schmidt C (2004)
In: Nucl.Phys.Proc.Suppl. 129/130. 545-547.

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We discuss the equation of state for QCD at non-zero temperature and density. We present results of a simulation for QCD with 2 flavors of p4-improved staggered fermions. Derivatives of $\ln {\cal Z}$ with respect to quark chemical potential $\mu_q$ up to fourth order are calculated, enabling estimates of the pressure, quark number density and associated susceptibilities as functions of $\mu_q$ via a Taylor series expansion. We also discuss the radius of convergence of the expansion as a function of temperature. It is found that the fluctuations in the quark number density increase in the vicinity of the phase transition temperature and the susceptibilities start to develop a pronounced peak as $\mu_q$ is increased. This suggests the presence of a critical endpoint in the $(T, \mu_q)$ plane.
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Ejiri S, Allton CR, Hands SJ, et al. The Equation of state for two flavor QCD at finite density. In: Nucl.Phys.Proc.Suppl. Vol 129/130. 2004: 545-547.
Ejiri, S., Allton, C. R., Hands, S. J., Kaczmarek, O., Karsch, F., Laermann, E., & Schmidt, C. (2004). The Equation of state for two flavor QCD at finite density. Nucl.Phys.Proc.Suppl., 129/130, 545-547.
Ejiri, S., Allton, C. R., Hands, S. J., Kaczmarek, O., Karsch, F., Laermann, E., and Schmidt, C. (2004). “The Equation of state for two flavor QCD at finite density” in Nucl.Phys.Proc.Suppl., vol. 129/130, 545-547.
Ejiri, S., et al., 2004. The Equation of state for two flavor QCD at finite density. In Nucl.Phys.Proc.Suppl. no.129/130 pp. 545-547.
S. Ejiri, et al., “The Equation of state for two flavor QCD at finite density”, Nucl.Phys.Proc.Suppl., vol. 129/130, 2004, pp.545-547.
Ejiri, S., Allton, C.R., Hands, S.J., Kaczmarek, O., Karsch, F., Laermann, E., Schmidt, C.: The Equation of state for two flavor QCD at finite density. Nucl.Phys.Proc.Suppl. 129/130, p. 545-547. (2004).
Ejiri, S., Allton, C. R, Hands, S. J, Kaczmarek, Olaf, Karsch, Frithjof, Laermann, Edwin, and Schmidt, Christian. “The Equation of state for two flavor QCD at finite density”. Nucl.Phys.Proc.Suppl. 2004.Vol. 129/130. 545-547.
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