Summary
The flatness problem posed by Dicke is studied within the framework of the pulsating model. In contrast with the simple solution proposed by the inflationary models of Guth and others,i.e. Ω = 1 always, it is found that Ω is a U-shaped function of the epoch: Ω = ∞ at the bounce as well as at the recollapse point, and has a minimum, which may be close to but exceeding unity, that occursafter the expansion rate a has reached a maximum. The values of Ω, the deceleration parameter, the Hubble constant, and the look-back time for several key values of the expansion epoch are given in closed form. Importantly, in contrast with the standard model, forq = 1/2, one has Ω > 1. It is proposed that the reason why the Universe is apparently near the Ω-minimum at an epoch at which terrestrial science has developed to a point it can make such a determination is because there are relations between the parameters governing the cosmological-expansion and terrestrial-evolution rates, which generate this synchronism. There are two appendices: the first shows in detail that there is no particle horizon problem for the pulsating Universe, and the second presents a space-time imbedding argument which clarifies how the expansion rate a can exceed the numerical speed of light because it is analogous to a Minkowski proper velocity.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02849849.
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Tangherlini, F.R. The flatness problem and the pulsating universe. Nuov Cim B 108, 1253–1273 (1993). https://doi.org/10.1007/BF02741278
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DOI: https://doi.org/10.1007/BF02741278