Steady Flow cosmological model

Juan Casado, David Jou

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

The possibility that the cosmological constant is decaying as the observable universe grows is explored, and we define a cosmological parameter, depending of the vacuum energy and the universe radius, which should be presently ca. 122 orders of magnitude smaller than at the Planck epoch. From it, a new version of the Friedmann equation for a flat universe is obtained, which allows the estimation of the Hubble parameter at any epoch and the reconstruction of the expansion history. The main result is a quasi-linear expansion dynamics in concurrence with a number of previous works. This behavior is compatible with the main features of observational cosmology and avoids the horizon, flatness, cosmological constant, coincidence and age problems without the need of neither inflation nor initial fine-tuning. © 2013 Springer Science+Business Media Dordrecht.
Original languageEnglish
Pages (from-to)513-520
JournalAstrophysics and Space Science
Volume344
DOIs
Publication statusPublished - 1 Apr 2013

Keywords

  • Cosmological constant
  • Cosmology: theory
  • Early universe
  • Hubble flow
  • Primordial nucleosynthesis

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