  The Cosmic microwave background (CMB) anisotropies predicted by two
cosmological models are compared, one of them is the standard model of general
relativity with cold dark matter and cosmological constant, whereas the second
model is based on a consistent vector-tensor theory of gravitation explaining
solar system and cosmological observations. It is proved that the resulting
differences -- between the anisotropies of both models -- are due to the
so-called late integrated Sachs Wolfe effect and, consequently, cross
correlations between maps of CMB temperatures and tracers of the dark matter
distribution could be used in future to select one of the above models. The
role of reionization is analysed in detail.
