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Astrophysics and Space Science

, Volume 198, Issue 1, pp 111–120 | Cite as

Cosmological parameters and redshift periodicity

  • Ágnes Holba
  • I. Horváth
  • B. Lukács
  • G. Paál
Article

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 Broadhurstet al. (1990) turns out to be maximally periodic in the calculated spatial distance. In a previous work, Paálet al. (1992) have demonstrated that among theflat 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 Ω0=ρ0/ρcrit andλ0=Λ/3H 0 2 acceptable periodicity is obtained forall 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 lineλ0=0.83Ω0+0.39 fitting to the previous optimum at Ω0=1/3,λ0=2/3. Any nonpositive value ofλ0 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.

Keywords

Dust Cosmological Constant Dimensionless Parameter Cosmological Model Parallel Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Ágnes Holba
    • 1
  • I. Horváth
    • 1
  • B. Lukács
    • 1
  • G. Paál
    • 2
  1. 1.Central Research Institute for PhysicsBudapestHungary
  2. 2.Konkoly Observatory of the Hungarian Academy of SciencesBudapestHungary

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