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Is the Universe flat?

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Abstract

The evidence for unseen mass (which is briefly reviewed) suggests that the cosmological density parameter Ω is at least 0.1–0.2. An Einstein-de-Sitter ‘flat’ universe with Ω = 1 — which is appealing for theoretical reasons — can only be reconciled with the data if the galaxies are more ‘clumped’ than the overall mass distribution, and are poor tracers of the unseen mass even on scales of several Mpc. Possible forms for the unseen mass are discussed; and feedback processes are outlined whereby galaxy formation can be suppressed in underdense regions.

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  1. Institute of Astronomy, Madingley Road, CB3 0HA, Cambridge, England

    Martin J. Rees

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  1. Martin J. Rees
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Rees, M.J. Is the Universe flat?. J Astrophys Astron 5, 331–348 (1984). https://doi.org/10.1007/BF02714464

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