NEW NONSEPARABLE DIAGONAL COSMOLOGIES

We find all the perfect fluid G(2) diagonal cosmologies with the property that the quotient of the norms of the two orthogonal Killing vectors is constant along each fluid world-line. We find four different families, each one depending on two or three arbitrary parameters where the metric coefficients are not separable functions. Some physical properties of these solutions including energy conditions, kinematical quantities, Petrov type, the existence and nature of the singularities and whether they contain Friedman-Robertson-Walker cosmologies as particular cases are also included.