Jeff,
Long before general relativity came along, we were experiencing gravity as an acceleration field. Since Newtonian gravity has been absorbed into the Einstein equations, Ricci curvature is how we describe the curvature of space-time, and consequently gravity. Given that we agree upon the (possible) existence of a fluid aether medium of some kind, then it is now possible to talk about manipulating gravity.
Mass and energy are the only known phenomena that can curve space-time; although the Cosmological constant and expansion of the universe are thrown in there just to further perplex us (ha ha).
I think that we both sort of agree that the vacuum of space, and in fact space-time itself, is made of waves. I would argue that it's made of wave-amplitudes. In the simplest sense, the wave-amplitude of a photon is
[math]\psi = A_0 e^{i\omega t}[/math]
Here is where it gets tricky. If wave-functions really are some kind of fibers in the "weave of space-time", then how do we write the wave-function of a photon for a curvature of space-time (which is an acceleration field)? I've heard that it's incredibly difficult even for the best mathematical physicists. So I use gravitational redshift as a place-holder until something better comes along.
I've already said that space-time is made of a whole range of frequencies, each with its own wave-function (math) or aether wave (ontology).
Question: is it possible to create a curvature in space-time (even just a tiny curvature), by generating a repeating frequency sweep at a high enough sweep rate? Gotta go!