In the ontological sense they are the same thing except that the g-field alone is not quite adequate to unify the forces and explain the causaton of the force of gravity... but the aether is. [[[ you can't posibly understand this without reference to the unified field theory that I am talking about ]]] Actually a density gradient is at a deeper level of description than the curvature maps. It gets us one step closer to causality. Entirely false and I am certain that you or GR have not explored all the options. The equations of GR work quite well but the explanations are entirely false and abstract. Furthermore GER is entirely inadequate to explain the causality of gravitation and to unify the forces. My point is that we should judge theories based on what they can accomplish not on esoteric quibling on ontological definitions and assumptions.