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Analytical properties of the scalar expansion in the cosmic fluid areinvestigated, especially near the future singularity, when the fluid possessesa constant bulk viscosity \zeta. In addition, we assume that there is aCasimir-induced term in the fluid's energy-momentum tensor, in such a way thatthe Casimir contributions to the energy density and pressure are bothproportional to 1/a^4, 'a' being the scale factor. A series expansion is workedout for the scalar expansion under the condition that the Casimir influence issmall. Close to the Big Rip singularity the Casimir term has however to fadeaway and we obtain the same singular behavior for the scalar expansion, thescale factor, and the energy density, as in the Casimir-free viscous case.

Casimir Effects Near the Big Rip Singularity in Viscous Cosmology