Collective flow and two-pion correlations from a relativistic hydrodynamic model with early chemical freeze-out

We investigate the effect of early chemical freeze-out on radial flow, elliptic flow, and Hanbury Brown-Twiss (HBT) radii by using a fully three-dimensional hydrodynamic model. When we take account of the early chemical freeze-out, the space-time evolution of temperature in the hadron phase is considerably different from the conventional model in which chemical equilibrium is always assumed. As a result, we find that radial and elliptic flows are suppressed and that the lifetime and the spatial size of the fluid are reduced. We analyze the p(t) spectrum, the differential elliptic flow, and the HBT radii at the Relativistic Heavy-Ion Collider energy by using hydrodynamics with a chemically nonequilibrium equation of state.