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...d Meng [2011] [29] have considered a universe model with w = ξ1 = ξ2 = 0. Then c/b = Ωξ0H0, b/a = 3/2 and eq.(22) reduces to H(z) = H0 [ Ωξ0 + (1− Ωξ0)(1 + z)3/2 ] . (23) Avelino and Nucamendi [2008] =-=[30]-=- have used supernova data to constrain the dimensionless viscosity parameter Ωξ1 = κξ1 by considering a matter-dominated universe model with bulk viscosity proportional to the Hubble parameter. In thi...