EXACT SOLUTION IN A SCALE INVARIANT MODEL WITH VANISHING COSMOLOGICAL CONSTANT

We analyze a special scale invariant effective theory with vanishing cosmological constant. We show that, in this theory, the spatial-independence of the inflation is implied by the equation of motion incorporated with the Robertson-Walker metric. Furthermore, we find that this theory can be solved exactly for k = O Robertson-Walker spaces. We also find almost exact solution in k not-equal 0 spaces.