Cosmological Models with Pressure

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Abstract
The effect of introducing pressure on relativistic cosmological models is investigated. The investigation is carried out in the case where a polytropic relation between the pressure and the density exists, and in the special case where the pressure is proportional to the density. When pressure is introduced some of the models are reclassified. It is shown that the radial distance, and hence all the cosmological parameters that are functions of this distance are affected. As an example the apparent magnitude-redshift relation for a model with zero and non-zero pressure are shown. It is found that the introduction of pressure always tends to decrease the travel-time of light from an object and the age of a universe model.

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