Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..234b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 234-241. Research supported by USIBSF and Smithsonia
Astronomy and Astrophysics
Astrophysics
59
Galactic Clusters, Gravitational Fields, Mass Distribution, Relic Radiation, Hubble Constant, Perturbation Theory, Spatial Distribution, Voids
Scientific paper
Observational constraints on the isotropy of the microwave background on angular scales greater than 1 deg seriously limit the possible fluctuations in the gravitational potential in the universe because of the Sachs-Wolfe effect. Consequently, they also provide a limit on the initial density inhomogeneities in the universe. These limits are used to show that the typical voids in the mass distribution in an Omega = 1 universe have limiting diameter of less than 80/h Mpc and that, for Gaussian initial fluctuations, there should be at most one void in the whole Hubble volume with a diameter greater than 130/h Mpc. Consequently, the observation of voids in the galaxy distribution larger than the above limit would imply that either (1) gravitational instabilities do not produce the observed structure on large scales, (2) variations in the galaxy distribution can be much more extreme than in the mass distribution (that is, light does not trace mass), or (3) the universe has a density parameter not equal to unity.
Blumenthal George R.
da Costa Luiz Nicolaci
Goldwirth Dalia S.
Lecar Myron
Piran Tsvi
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