Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-06
Astronomy and Astrophysics
Astrophysics
15 pages
Scientific paper
In this paper we point out that the radius R, the age t and the mass M of the observable Universe are proportional to Planck units for length lp, time tp and mass mp.This hypothesis is related, by a cosmological model linking the universal expansion to the speed of light, with a time variation of c and of the Planck constant, which implies that lp and tp increase with time while mp remains constant. We discuss some of the implications these relationships could have on quantum cosmology and obtain that the Universe entropy associated to the event horizon is constant along its history. Quantum effects were smaller in the past, in such a way that their conflict with general relativity about the Planck era vanishes.
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