Cosmological parameters and redshift periodicity

Ágnes Holba, I. Horváth, B. Lukács, G. Paál

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1 Citation (Scopus)

Abstract

This work is the continuation of the search for such a cosmological model using which the observed redshift distribution of galaxies in the sample of Broadhurst et al. (1990) turns out to be maximally periodic in the calculated spatial distance. In a previous work, Paál et al. (1992) have demonstrated that among the flat models with non-negative cosmological constant (e.e., vacuum density) the one with a vacuum: dust ratio 2:1 provides the optimum. Now we extend that study to the case of arbitrary space curvature and find equally good periodicity in a surprisingly wide range of models. By use of the dimensionless parameters Ω00crit and λ0=Λ/3 H02 acceptable periodicity is obtained for all points of the parameter plane within the strip between the parallel lines 0.83Ω0-0.30<λ00)<0.83Ω0+0.85(Ω0<1.8), whilst the best periodicities appear along the line λ0=0.83Ω0+0.39 fitting to the previous optimum at Ω0=1/3, λ0=2/3. Any nonpositive value of λ0 gives bad periodicity unless the space curvature is strongly negative and Ω0<0.4. Fairly good periodicity is observed only in the range of the deceleration parameter -1.2≤q0<0.2, corresponding to a small or even negative total gravitational attraction and an expansion time-scale longer than usually expected.

Original languageEnglish
Pages (from-to)111-120
Number of pages10
JournalAstrophysics and Space Science
Volume198
Issue number1
DOIs
Publication statusPublished - dec. 1 1992

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ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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