At the risk sounding foolish,I have been reading yet more about this (space time, gravity gravitons etc etc) and ask is not "space time" a geometric expression? The key issue as far as gravity seems to be that it removes the requirement of force between objects and explains gravity as bodies following the course of the least resistence provided by space being curved near objects. I see no reason why radiation pressure could not indeed be the physical way objects affect each other and space time a system of geometry to "measure" and "quantify"
.The problem of making special relativity fit with quantum mechanics leaves the graviton in the same boat really as "gravity" rain. String theory seems to support the exsistence of a graviton.. and I add I have no idea about string theory and am simply relating a snippet from my reading.
The graviton "they" look for comes from the quantum approach and they talk about it as "interacting" with other particles. It is discrete (not secretive but a "seperate" particle) with a spin 2 and I dont understand that but it implies its ability to interact with other discrete particles I gather. It seems to me whatever quantum mechanics comes up with it will have difficulty fitting SR be it my gravity rain idea or the graviton they seek. I dont know if there are any experiments looking for the graviton. The cleaning fliud tanks in mine shafts look for dark matter candidates as I understand it..wimps in particular... gravity rain would be very wimpish I recon.
alex
They dont say it acts as a pushing force yet but they are almost there
alex