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Given that space is flat or nearly so by all the best data, why does Omega need to be "one" in an accelerating universe. Critical density was a necessity in the Einstein -de Sitter model (q = 1/2) in order to explain why the Hubble universe had not run away or collapsed in 13.7 billion years - we all got sold on the the beautiful mathematical model that had the universe slowing to zero velocity at eternity - now we know that expansion trumps gravity on the large scale - what factors or experiments (other than flatness) now drive the search for the missing matter that makes Omega unity? Is it only geometric flatness?
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