Photons behave differently from massive particles in the potential energy field. They have energy but no mass. This implies they are two dimensional objects, having width and height without length - a disc moving through space. This gives them an vertical internal energy gradient. Sin 90° = 1, so they always move at the speed of light. Cos 90° = 0, so they have no proper time. Tan 90° = infinity, so they can neither slow down nor speed up.
Energy gradients in the direction of motion alter the energy of a photon. If it ever reaches zero energy, it ceases to exist. Energy gradients orthogonal to the direction of motion (along the diameter of the disc) alter the direction of motion. Photons cannot reverse course, but they can and do change direction. They can even orbit a remarkably massive object.
Since they move at the speed of propagation, photons have no effect upon the potential energy field ahead of themselves. Since their internal energy returns to the baseline (no rest mass), they have no effect upon the potential energy field directly behind themselves, either. However, they do create a lateral gradient around the edge of the disc.
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