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Evidence for a static universe
In article , "Phillip Helbig (undress to
reply)" writes: Inflation NEVER predicted a matter density equal to the critical density. It predicts, fairly robustly, a flat universe. If one ASSUMES that the cosmological constant is zero, then that implies Omega=1, but this is an invalid assumption and is not a prediction of inflation. But with the observations of distant supernovae in 1997, we discovered that we were missing the energy density required for cosmic acceleration, and that this energy density is roughly what was needed for a flat universe. Subsequent CMB observations have confirmed this estimate of the amount of dark energy. This is simply not true. Look at the contours in the lambda-Omega plane from the supernova data. They are essentially orthogonal to lines of constant curvature. Yes, they do indicate a positive cosmological constant, and while compatible with a flat universe, are also compatible with a much larger region of parameter space. Thus the distant supernovae observations validate the major prediction of inflation models. The major prediction is flatness, and the CMB data say essentially nothing about this. There is no conflict; they are just not very sensitive to the curvature. This should be "and the supernova data say essentially nothing about this". The CMB contours are essentially perpendicular to the supernova contours in the lambda-Omega plane, the former being almost parallel to lines of constant curvature, which is why combining them gives much tighter constraints. The prediction of inflation models of a flat universe has been confirmed in multiple ways. Yes, but not by supernova data. |
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