A steady flow cosmological model from a minimal large numbers hypothesis

Juan Casado

Research output: Contribution to journalArticleResearchpeer-review


Assuming a minimal version of the Large Number Hypothesis, we explore the possibility that the cosmological constant has decayed with time and define a cosmological parameter, depending of the vacuum energy and the universe scale, which should be presently ca. 10122 times smaller than at the Planck epoch. From it, a short version of the Friedmann equation for a flat and spatially infinite universe is obtained, which allows the estimation of the Hubble parameter at any epoch. The obtained result is a linear expansion dynamics in concurrence with a number of previous works, including a Steady Flow model, whose main features are compared with the Concordance model. The resultant model is devoid of the horizon, flatness, cosmological constant, coincidence and age problems without the need of either inflation or initial finetuning. It agrees with the main features of observational cosmology including the supernovae results, cosmic background radiation anisotropy, angular size-redshift relation, gravitational lensing, X-Ray and gamma ray bursts data, and accommodates old high redshift objects. On the other hand, it agrees with the standard model as regards to primordial nucleosynthesis, cosmic recombination, expansion time and temperature evolution with the scale factor. © 2011 C. Roy Keys Inc.
Original languageEnglish
Pages (from-to)297-320
Issue number3
Publication statusPublished - 28 Oct 2011


  • Cosmological parameters
  • Cosmology: Observations
  • Cosmology: Theory
  • Distance scale
  • Early Universe.


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