The paper derives and solves perturbation equations for matter plus a viscous modified Chaplygin gas, finding density contrast amplitudes above those in Lambda CDM.
Modified chaplygin gas cosmology with bulk viscosity
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Perturbations with bulk viscosity in modified chaplygin gas cosmology
The paper derives and solves perturbation equations for matter plus a viscous modified Chaplygin gas, finding density contrast amplitudes above those in Lambda CDM.