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We know light and massive particles behave like waves. Like all waves, the amplitudes don't travel along the motion axis but they are propagated. This property is specific to all waves whether mechanical or electromagnetic.The variation electromagnetic field amplitudes creates a wave that advances forward, but there is nothing really moving from one place to another. These waves can also transfer energy to massive particles. The energy is transmitted in fixed amounts by waves packets that apparently are superposition of waves of different frequencies. But these wave packets still propagate
In QFT there are fields associated with all particles. These field work similarly to the electromagnetic and the same thing happens to these particles. They don't move as rigid object motion is defined, but propagate as waves.
For a rigid body motion, the object preserves its identity. When travelling from point A to B it is the same object whereas waves can maintain their wave pattern, frequency spectrum, polarization similarly but it's not the same thing.
For a rigid body motion, the object preserves its identity. When travelling from point A to B it is the same object whereas waves can maintain their wave pattern, frequency spectrum, polarization similarly but it's not the same thing.A rigid body has inertia and maintains its velocity if isolated(no forces acting on it). For EM waves the propagation velocity doesn't depend on amplitudes and it is always constant. I don't know how QFT explains a lower velocity propagation for other particles, but for constant propagation velocity waves, according to my hypothesis you can only have velocity variations for wavefronts where local momentum vector of the waves don't point to the direction of motion but at an angle as in OAM beams.
Another problem is relativity. If the world consists of these waves, we only have relative velocities between wave packets. I don't think we can apply relativity if there is no true motion. Relativity works is because the mathematical model matches our observations, but what is the meaning of it in this context?
I'm not sure how much my opinion differs from mainstream on fundamental motion. QFT also seems to be about (quantum) fields and waves. There are two issues.
I don't know how QFT explains why electron waves at lower frequency propagate slower