The speed of light is the rate at which everything that exists is drawn from non existence and is thus the speed at which the action of gravity is applied. The intensity of this action is determined by the distortion applied to dimension, as was described here for the formation of the proton i.e. The greater the concentration of matter the greater the distortion applied to dimension, which is obvious. But gravity is a force in this universe because, from one instant to the next, the whole base of dimension on which light propagates is dynamically drawn inward toward the center of mass.
Light freely follows the geodesic path set by the shifting base of dimension wherever that may lead because the motion of light is not inertial. Matter cannot be expected to obey the same rules. A ray of light passing close by earth's surface is following the shifting dimension toward the earth's center of mass at the rate of 19.6 m/sec^2. That of course also applies if the ray is pointed downward or upward from the surface. The speed of light is necessarily 19.6 m/sec faster downward and 19.6 m/sec slower upward, relative to the average speed of light parallel with the surface.
This experiment was designed to detect the up-down light speed variation. The results were as predicted, but because it was necessary to turn the interferometer setup in a plane perpendicular to the earth's surface, they could not be guaranteed.Whatever the relationship between matter and dimension in a gravity well, that relationship is changing at a specific rate from one instant to the next chosen instant and the matter is thus undergoing constant acceleration within that dimension. If the matter is falling freely, whatever change has occurred in the updated matter/dimension relationship after a set time has elapsed, that same degree of change will have taken place in the next elapsed time span. The moving dimension itself applies the accelerating force. In any time span, dimension increments further into the gravity well than the matter by the same distance that the matter has fallen.
Dimension is updated at the speed of light from the gravity source, so the force applied by the shifting dimension reduces to zero for light speed motion toward the source, and doubles for light speed motion in the up direction.
The original equation representing the effect of the anisotropic gravity on an upward moving mass relative to a gravity source was given as ((c+v)^2/c^2)^.5*G*M/r^2-(G*M/r^2), while ((c-v)^2/c^2)^.5*G*M/r^2-(G*M/r^2) represented its effect on a downward moving mass.
The equations have since been simplified to v/c(GM/r^2). Physical sign manipulation for the up and the down motion directions is unnecessary using signed radial velocity relative a gravity source (- in and + out).
Continues.