“…where α ± , ρ ± , u ± , P ± (ρ ± ), and τ ± denote the volume fractions, densities, velocities, pressures, and stress tensors of two fluids respectively. The global existence of weak solutions to (1.7) with degenerate viscosity coefficients was proved in [8,9] for P + (ρ + ) = P − (ρ − ), and the global well-posedness and optimal time-decay rates of strong solutions near the constant equilibrium state to (1.7) were studied in [22,48] for P + (ρ + ) = P − (ρ − ).…”