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I mean, what are the laws that limit the speed of light? Why not faster or slower...
In any case we should point out that what we know for certain (I mean, experimentally confirmed) about light speed is its "go and back speed", that is the speed in a closed circuit. We are not able to measure light speed from "here to there", for example from here to the Moon; only the speed in the total circuit from here to the Moon and back.
Why can we not sychronise two clocks one on the moon and one on Earth and measure the transit time of a light pulse or am I running into logical circles ?
It is tempting to say that the permeability and permittivity of free space determine the speed of light, but that is circular logic. The truth is their values are defined in terms of the speed of light. You can derive the speed of light from the definitions of permeability and permittivity, not by the measured values of those parameters.
If there is an aether, it stands to reason that its acoustic properties determine the speed of light. There is a formula for the speed of acoustic shear waves in a solid, determined by the shear modulus and inertial density of the solid. For that formula to apply to the speed of light, the aether would need to be incredibly dense and incredibly stiff. At least, it is incredible to most scientists, but not for me. I believe there is an aether; its inertial density must be many orders of magnitude greater than that of a neutron star, and it is comparably stiff. There is a unique reference frame which is stationary relative to the aether, but that does not make it measurably different from any other reference frame, unless there are observable faster-than-light phenomena. The existence of an aether has not been disproven; it has merely been made irrelevant, so long as there are no observable FTL phenomena.
I don't know anything about what you say of that kind of aether; however I don't understand how can light speed be independent of the inertial frame of reference, if a privileged frame for light existed.
It may be added that the whole change in the conception of the Aether which the Special Theory of Relativity brought about, consisted in taking away from the Aether its last mechanical quality, namely, its immobility.