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In the present paper, we are considering a spatially-flatFriedmann-Robertson-Walker cosmological model, fueled with stiff matter anddust, treated as non-interacting ideal fluid sources. By solving thecorresponding Friedmann equation with a non-zero cosmological constant, we arederiving the scale function and the fundamental cosmological parameters. Withina thermodynamic approach, the general form of the Equation of State isobtained, together with the explicit dependence of the energy density andpressure on temperature.

Spatially-Flat Robertson-Walker models with combined CDM and stiff matter sources and the corresponding thermodynamics