TY - CONF
AB - 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.
AU - Ejiri, S.
AU - Allton, C. R
AU - Hands, S. J
AU - Kaczmarek, Olaf
AU - Karsch, Frithjof
AU - Laermann, Edwin
AU - Schmidt, Christian
ID - 1968871
KW - fermion number: density
KW - fermion: lattice field theory
KW - flavor: 2
KW - finite temperature
KW - gauge field theory: SU(3)
KW - numerical calculations: Monte Carlo
KW - pressure
KW - susceptibility
KW - talk: Tsukuba 2003/07/15
KW - Taylor expansion
KW - critical phenomena
KW - density: finite
SN - 0920-5632
TI - The Equation of state for two flavor QCD at finite density
VL - 129/130
ER -