2+1 dimensional hydrodynamics including bulk viscosity: a systematics study

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We have studied the effect of nonzero bulk viscosity with peak near the lattice QCD predicted crossover temperature Tco 175 MeV on charged particle transverse momentum spectra and elliptic flow. The Israel-Stewart theory of 2nd order causal dissipative relativistic fluid dynamics is used to simulate the space time evolution of the matter formed in Au-Au collisions at √sNN=200 GeV assuming longitudinal boost invariance. A systematic comparison of temperature, transverse velocity, spatial and momentum anisotropy evolution of the ideal, bulk and shear viscous fluid has been carried out. Two different temperature dependent forms of ζ/s and a constant η/s was used. Both the bulk and shear viscous correction to the ideal freezeout distribution function are included. The dissipative correction to the freezeout distribution for bulk viscosity was calculated using Grad's fourteen moment method. From our simulation we show that the method is applicable only for ζ/s < 0.005×η/s|KSS for freezeout temperatures 130 and 160 MeV.