is inaccurate

1 Einstein's comprehension on ‘light velocity's invariability’ is inaccurate

As the measuring result of motion, velocity is relative and changeable. Firstly, the light velocity can be divided into phase velocity and group velocity. The phase velocity is often faster than the light speed C, so, the invariable light velocity will only be the group velocity assesableby general method.

Secondly, the most important idea is mean velocity and prompt velocity of light, and the velocity of the invariable light velocity is mean velocity in special relativity. This means:

Here, 1=C, representing the light speed. This formula was obtained using Lorentz transformation, which presume the light crossing some time and distance. So the velocity should be the mean velocity of light.

Thirdly, any calculation of velocity must have a calculating origin point, and it should be the origin point of the coordinate. The velocity that takes the observer as the calculating origin point is the subjective velocity, and the velocity that takes the motion crossing point as the origin point is the objective velocity. The “invariable light velocity” is the subjective velocity because only the motion relative to observer is taken into considerationin special relativity.

Earlier experiments falsified the “invariable of light velocity”. For an example, the delay effect of radar reflected waves proved that light mean speed would be slower if the running distance of light was enough long. The Eq. (1) is effective only in “absolute space”(no mass), but ineffective in any true space.

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