Simply put, if Lorentz Ether Theory is right and the one way speed of light isn't C in all frames...
Then it is possible to indirectly measure the one way speed of light in principle and find the preferred frame. Photons are recognized to both bend towards gravity, impart momentum when they hit something, and are believed to manifest a gravitational field, a black hole made of light even has a name, a Kubelblitz. So if we have 2 parallel channels like a race track, and we have photons moving up one channel, turning around (mirrors) and going down the other channel, then being directed back up the first chanel in an endless loop, then if the speed light travels up and down stream is the same then there are the same mass of photons in each path. However, if one path is, say a million times faster, (and the other one takes about twice as long) and if we input a million and one photons such that the slower path which is a million times slower has a million phonons in it at any time, and each photon slowly enters the faster path such there is only one photon in this path. It is possible in principle to weigh the weight of the 2 paths or to otherwise detect their gravitational fields to find that one is heavier than the other telling us that light speed is anisotropic, uneven. This is my idea, it appears to be novel and there is no well recognized way to do this. Jonathan. note: The photons moving in each direction have the same energy (frequency) and if that were not so it would itself give away an asymmetry, but the reason it's balanced is the slower photons moving upstream have been blue shifted by hitting the mirror at the back which gave them energy and keeps the energy high but any receiver/sensor is moving away from it so it is shifted back, the mirror at the front red shifts the photon that is moving faster, but the sensors are moving toward it which shifts the energy back. Anyway, again if the photons had a different energy we could detect that, but they don't, so that means this does work as the single photon photon produces a millionth of the gravitational influence of the other arm.
