The magnituderedshift and angular diameterredshift relations for a matter and radiation filled Universe.
Abstract
The magnituderedshift and angular diameterredshift relations are discussed for matter and radiationfilled Universe models with a nonvanishing cosmological constant. The inclusion of homogeneous pressure into the energymomentum tensor gives larger deceleration parameters in comparison with dustlike cosmological models. It changes the slope of the magnituderedshift and angular diameterredshift relations and leads to brightening of distant sources as well as to an increase in their diameters at the same value of the density parameter. However, this effect is smaller than that due to the luminosity and linearsize evolution of distant objects with time.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 November 1977
 Bibcode:
 1977A&A....61..539K
 Keywords:

 Matter (Physics);
 Radiation Distribution;
 Red Shift;
 Universe;
 Angular Distribution;
 Astronomical Models;
 Cosmology;
 Astrophysics