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In order to measure the light speed formulated in (4) always as a constant value, the beat of time must have been shorter in the past and must become longer in the future, according to the relation Dt ~ t 1/3   or, resp.,
c Dt = const.        (5)
It is interesting, a light speed varying with time, lately also is being taken into consideration by other scientists.
Andreas Albrecht from the  University of California in Davis, John Barrow from the Cambridge University and Joao Magueijo from the Imperial College in London, lately have introduced the  VSL Theory (Varying Speed- of- Light theory), which also postulates a light speed decreasing with time. [15], p. 42:
„.... the most promising and provoking  alternative to the inflation model well may be the theory of the VariableLlight Speed, or VSL- Theory."
This theory, however, is still regarded sceptically [15], p. 43:
“It remains to be seen if these observations can withstand more exact examinations; for now, the VSL theory poses big challenges to the theorists, as it shakes the basics of physics much more than the inflation model. It is still far from belonging to the established physics. It is pure speculation.”
But according to the CTH, a light speed decreasing with time as per (3) is, however, no speculation, but a consequence that coercively follows from the GTR. By the way, observations also show, the universe expands at the speed of light: The farthest objects we can observe with our telescopes, have a red shift of
 z » 5.5, meaning they move away from us at more than  95% of the light speed.

4.2 The cosmic (absolute?) time

t ~ R ~ M ~ t 2/3                 (6)
® Dt ~ t 1/3
According to /6), the basic values time (t), space (R) and matter (M) which present our physical reality are linked to each other in the simplest imaginable way and thus build a linked, self- controlled system that rests in the state of dynamic equilibrium.
As the following quotations show, Ernst Mach was the first and later other scientists, as well, to take an “absolute” time into consideration, the  existence of which is defined by cosmic processes [12], p. 21 ff:
“If, by natural laws, one process would be especially distinguished, then one could use this for the definition of an “absolute” time measure….. Mach had assumed that the “entropy of the universe” could be used as a value for the absolute time.”
J. Barrow also expresses doubts towards the conventional time term [16], p. 481:
“How can we know that there is not a basic time measure which is linked to the total universe?”
Paul Davies is even more explicit [14], p. 212:
"Cannot one use the expansion of the universe itself as a clock?”
 
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