Cosmological parameters and redshift periodicity |
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Authors: | Ágnes Holba I Horváth B Lukács G Paál |
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Institution: | (1) Central Research Institute for Physics, Budapest, Hungary;(2) Konkoly Observatory of the Hungarian Academy of Sciences, Budapest, Hungary |
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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 0=
0/
crit and
0= /3H
0
2
acceptable periodicity is obtained forall points of the parameter plane within the strip between the parallel lines 0.83 0–0.30<
0( 0)<0.83 0+0.85( 0<1.8), whilst the best periodicities appear along the line
0=0.83 0+0.39 fitting to the previous optimum at 0=1/3,
0=2/3. Any nonpositive value of
0 gives bad periodicity unless the space curvature is strongly negative and 0<0.4. Fairly good periodicity is observed only in the range of the deceleration parameter –1.2 q
0<0.2, corresponding to a small or even negative total gravitational attraction and an expansion time-scale longer than usually expected. |
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Keywords: | |
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