A&A 422, 401-405 (2004)
The Dyer-Roeder relation in a universe with particle productionM. de Campos1 and J. A. Souza2
1 Physics Department, UFRR, Campus do Paricarãna, Boa Vista, RR., Brasil
2 UFF Physics Institute, Av. Litorânea s/n, Niterói, RJ., Brasil
(Received 16 September 2002 / Accepted 23 March 2004 )
We have obtained analytical exact solutions of the Dyer-Roeder equation in a cosmological model where creation of particles occurs at the expense of the gravitational field. We discuss the influences of inhomogeneities in the path of a light beam on the apparent diameter of astrophysical objects and consider both redshift independent and redshift dependent distributions of the inhomogeneities.
Key words: cosmology: miscellaneous -- cosmology: theory
© ESO 2004