Abstract
In some few steps a model describing the physical character of the cosmological expansion of the Friedmann-Robertson-Walker closed universe is developed. Due to the fact that the rate of the cosmic time is changing, the conclusion is drawn that a hidden expansion is superposed on the generally known expansion of the Universe. The resulting picture-the bi-expansive model-is brought into connection with the voids in the Universe.
The expansion is described as a ‘motion’ in a spatial dimension orthogonal to our space-the 4-dimensional sphere, and some characteristic properties of such a ‘motion’, compatible with the special and general relativity, are outlined. The question of the world-force retarding the expansion is touched upon, and the concepts of contemporaneity and distance in cosmology are specified. Some attempts to a physical explanation of the connection between the voids and the bi-expansive model are given in the Appendix. Also in the Appendix the Friedmann equation is rather unconventionally used for a deduction of the value of the Hubble ‘constant’ as a function of distance.
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Voráček, P. The specific physical character of the expansion of the Universe. Astrophys Space Sci 111, 103–121 (1985). https://doi.org/10.1007/BF00651521
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DOI: https://doi.org/10.1007/BF00651521