Viscous {\Lambda}CDM Universe Models
  We explore flat {\Lambda}CDM models with bulk viscosity, and study the role
of the bulk viscosity in the evolution of these universe models. The dynamical
equations for these models are obtained and solved for some cases of bulk
viscosity. We obtain differential equations for the Hubble parameter H and the
energy density of dark matter {\rho}, for which we give analytical solutions
for some cases and for the general case we give a numerical solution. Also we
calculate the statefinder parameters for this model and display them in the
s-r-plane.
