Fixed Scale Approach to Equation of State in Lattice QCD
  A new approach to study the equation of state in finite-temperature QCD is proposed on the lattice. Unlike the conventional method in which the temporal lattice size $N_t$ is fixed, the temperature $T$ is varied by changing $N_t$ at fixed lattice scale. The pressure of the hot QCD plasma is calculated by the integration of the trace anomaly with respect to $T$ at fixed lattice scale. This "$T$-integral method" is tested in quenched QCD on isotropic and anisotropic lattices and is shown to give reliable results especially at intermediate and low temperatures. 
T.Umeda, S.Ejiri, S.Aoki, T.Hatsuda, K.Kanaya, Y.Maezawa, H.Ohno