Maybe NIST in boulder, USA, can give information on the measurement of energy in the ether between galaxies.
Around stars this energy is huge and the sun "distributed" it already for several billion years. As energy has mass aequivalent it might play a role regarding the dark matter problem.
Remarkable is that galaxies recede from each other, though not at increased speed if c was bigger in the past (Yanchilin 2003), while within such systems attraction prevails.
The expansion of the universe is not accellerated when c slows down to its edge and the witchcraft providing negative energy won't be necessary. Expansion of the universe may be considered in terms of entropy.
As a point does not exist in physics because it has no dimensions a cube is necessary for the wanted measurement. Our eyes catch only a minor fraction of all the electro-magnetic energy in such a cube. P.e. the surface of the Andromeda galaxy and its radiation can be measured tot estimate its contribution to the energy density.
Constancy of c was introduced a century ago as a working hypothesis , which led to a wrong general theory of relativity. In the GPS satelite the same amount of time passes as down on Earth, but the speed of physical processes differs due to changing g. Could there be dependancy of radio-activity (atomic clocks) on g?
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