Observations in Some Simple Cosmological Models with Shear

Abstract

Homogeneous but anisotropic models of Bianchi type I with the two distinct forms of singularity, the ‘pancake’ and ‘cigar’, are considered in some detail. It is found that in some directions of observation neither the red shift nor the luminosity distance is a monotonic function of the emission time. Some numerical examples are given and possible consequences with regard to the selection of world models and the problem of quasars are discussed.