An extension of relativity theory through asymmetric cosmic time

The Special and General Theories of Relativity (SRT and GRT) are based on the axiom "The vacuum speed of light is a universal natural constant (c = constant). The consequence of this is that time had to be relativised in both SRT and GRT. Einstein later formulated this even more generally: "One can use the principle of the constancy of the vacuum light velocity to complete the definition of time." Since both theories of relativity have so far been brilliantly confirmed experimentally, it can be assumed that the axiom c = constant has fundamental physical significance. If one now applies the ART GRT to the entire (flat) universe, astonishingly a time-dependent speed of light proportional to the expansion speed results. Since this is a purely measured quantity and cannot be determined by means of a theory, the question arises whether, similar to SRT and GRT, time does not have to be relativised a third time in order to satisfy the axiom c = constant. This can be achieved by introducing a cosmic time τ, which changes proportionally to the world radius R (τ ~ R, c(τ) ~ dR/dτ = constant). This additional relativisation of the concept of time not only represents an extension of the theory of relativity, but also has drastic consequences for all of physics, especially for cosmology. The characteristic feature of the < Cosmic Time Hypothesis > (KTH) is that the time cycle is variable, in the sense that time used to run faster and will run slower in the future than it does today. This retarding flow of time has the consequence that the laws of nature change with time, which, by the way, Paul Dirac already suspected: "At the beginning of time, the laws of nature were probably very different from what they are now. We should therefore consider that the laws of nature change continuously with time, instead of being uniform throughout space-time." As with any theory, the quality of the KTH must be measured by its explanatory potential or its ability to solve problems. Here are a few examples: - The KTH elegantly solves several old problems of the big bang theory, the problem of the horizon, flatness, galaxy formation and the age of the world. The inflation theory thus becomes superfluous. According to the KTH, there is no such thing as "dark energy". The cosmological constant (Λ) has the value zero. - At Planck time (tp ≈ 10${}^{-43}$ s), the strongest natural force (strong nuclear force) and the weakest (gravitational force) were equal, as required by the theory of supersymmetry (SUSY). - The universe is infinitely old! There was no big bang.