Flat Friedmann-Robertson-Walker cosmologies with adiabatic matter creation: kinematic tests

We investigate observational consequences of a cosmological scenario driven by adiabatic matter creation. Exact expressions for the lookback time, age of the universe, luminosity distance, angular diameter, and galaxy number counts versus redshift are derived and their meaning discussed in detail. T he expressions of the conventional FRW models are significantly modified an d provide a powerful method to limit the parameters of the models.