A Dust Universe Solution to the Dark Energy Problem

Astronomical measurements of the Omegas for mass density, cosmological constant lambda and curvature k are shown to be sufficient to produce a unique and detailed cosmological model describing dark energy influences based on the Friedman equations. A measurement for the equation of state omega is shown to be redundant in this theory as pressure turns out to be identically zero at all epochs. This implies a theoretical contradiction of the measured value for omega which is claimed to be approximately minus unity. The model has the characteristic of changing from deceleration to acceleration at exactly half the epoch time at which the input measurements are taken. This is a mysterious feature of the model for which no explanation has so far been found. An attractive feature of the model is that the acceleration change time occurs at a red shift of approximately 0.8 as predicted by the dark energy workers. Using a new definition of dark energy density it is shown that the contribution of this density to the acceleration process is via a negative value for the gravitational constant, -G, exactly on a par with gravitational mass which occurs via the usual positive value for G. Because of the uniqueness of the model derived here from general relativity and measurements of the three Omegas, it is suggested that to find a model incorporating the three Omegas and omega would probably require going outside the structure of general relativity theory