NONVACUUM COSMOLOGICAL SOLUTIONS OF 5D VARIABLE MASS THEORY OF GRAVITY

A class of non-vacuum expanding cosmological solutions of Wesson's 5D theory of gravity with variable rest mass is derived. The models are s patially homogeneous and isotropic and the source of gravitation is a pressureless fluid (dust) plus a cosmological constant term. The gener al and unified solution is found for the equations and some properties of different limiting cases are studied. Particularly, it is shown th at for null cosmological constant the predicted age of the universe is smaller than the ones of the 4D FRW models.