The aether can be thought of as an extremely dense fluid with virtually no mass or energy of its own, but with every particle moving at the speed of light. It is not clear why all the particles move at the same speed, but the fact that the aether is extremely dense helps to explain this to some degree, because density of materials have the effect of coordinating motions and disturbances within them. If one particle moves, all other particles will have to move in order to accommodate for the displacement, and this accommodation has to happen at the same speed as the disturbance.
From this, we can go on to explain the phenomenon of electron-positron pair production in more detail, as it gives us a reason for why photons sometimes pop from being extremely dense particles to becoming the relatively much larger bloated structures known as electrons and positrons. It also explains why this transformation includes a radical change in speed.
Let us consider a gamma-ray photon, large and energetic, encountering a barrier of some kind. It has to zip past this barrier, or reflect off of it in a way that keeps its speed unchanged, or else, the aether through which it is traveling will become like a wall. Any kind of acceleration or deceleration will be rejected by the surrounding aether. Unable to keep its speed in harmony with the aether, the gamma-ray photon must yield its energy to the aether, or transform itself into an entity that does not have to move at the same speed as every other particle. Since photons do not readily share their energy with other photons, the latter option comes into effect. The photon breaks into two parts, with each part rapidly expanding in size.
Photon transformed into an electron-positron pair
A photon that does not keep its speed uniform at the exact same rate as the surrounding aether, pops into an electron and a positron. In this process, the aether is like a wall with particles hitting the photon from all sides, and it is not before the popping is completed that the newly formed electron and positron can start moving again. Until then, the photon is held rigidly in place by the aether. However, once the transition is completed, the newly created electron and positron can move freely. This is because they are balloon-like nets compared to the aether. The aether moves freely into and out of them as long as they move slow enough for the aether to do so.
This explains why photons must pop when stopped by a barrier. They cannot remain in an in-between state. They must either be photons, moving at the speed of light as they pass through the aether, or become electrons and positrons through which the aether can move unhindered.
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