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Journal of Physical Studies 4(4), 470–475 (2000)
DOI: https://doi.org/10.30970/jps.04.470 LARGE SCALE STRUCTURES AND INTEGRATED SACHS–WOLFE EFFECT IN NON-ZERO Λ COSMOLOGIESS. Apunevych, B. Novosyadlyj
Astronomical Observatory of Ivan Franko National University of Lviv, |
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Some interesting features of the large scale structure formation in the model of the Universe with the cosmological constant are discussed. In the framework of such a model we consider the evolution of small scalar perturbations of metrics, density and velocity of the matter for the dust-like medium.
On the basis of the corresponding solutions of the Einstein equations the analysis of the long distance correlations of clusters of galaxies, contribution of the integrated Sachs-Wolfe (ISW) effect into microwave background temperature fluctuations and the Great Attractor problem in a non-zero $Λ$ cosmology is carried out. It is shown that the data on long distance correlations in spatial distribution of clusters of galaxies are well explained in the framework of such models when $Ω_{Λ}\ge 0.5$. On the other hand, the possibility of a nearly convergent flow of the galaxies in the neighborhood of the Local Group to be generated by the gravitational action of single large scale matter density perturbation is even more insignificant in the $Λ\ne0$ case in comparison with the models without $Λ$. It is shown also, that the main contribution to the microwave background temperature fluctuations due to ISW effect is formed at $0.05 \le z\le 1$. Its value for models with different $Ω_{Λ}$ is estimated.
PACS number(s): 98.80.Ft, 98.80.Es, 98.65.Dx