Cosmological parameters and redshift periodicity

Holba, Ágnes and Horváth, István and Lukács, Béla and Paál, György (1992) Cosmological parameters and redshift periodicity. Astrophysics and Space Science, 198 (1). pp. 111-120. ISSN 0004-640X (print), 1572-946X (online)

Text 1109548.pdf Restricted to Registered users only Download (724kB) | Request a copy

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, Paal et al. (1992) have demonstrated that among the flat models with non-negative cosmological constant (i.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 OMEGA0 = rho0/rho(crit) = lambda0 = LAMBDA/3H0(2) acceptable periodicity is obtained for all points of the parameter plane within the strip between the parallel lines 0.83OMEGA0 - 0.30 < lambda0(OMEGA0) < 0.83OMEGA0 + 0.85 (OMEGA0 < 1.8), whilst the best periodicities appear along the line lambda0 = 0.83OMEGA0 + 0.39 fitting to the previous optimum at OMEGA0 = 1/3, lambda0 = 2/3. Any nonpositive value of lambda0 gives bad periodicity unless the space curvature is strongly negative and OMEGA0 < 0.4. Fairly good periodicity is observed only in the range of the deceleration parameter - 1.2 less-than-or-equal-t0 q0 < 0.2, corresponding to a small or even negative total gravitational attraction and an expansion time-scale longer than usually expected.

Actions (login required)

Edit Item