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marcus
#1
Jan26-07, 01:31 PM
Astronomy
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PF Gold
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P: 23,117
Ned Wright just posted this paper where he says the best-fit Omega is 1.011.

It is still consistent to imagine that space is flat infinite with Omega exactly 1, but that is not what fits the data best. In other words, if you like thinking of space as infinite and Euclidy that is fine and no reason you should re-arrange your mind.

But Wright took all the available---WMAP, supernovae, gammarayburst, galaxy-counts etc.----and came up with a best-fit that makes space a BUMPY THREESPHERE WITH RADIUS (of curvature) 130 BILLION LIGHTYEAR.

If you take that seriously then the world could have sprouted from the bottom of a black hole. So it may be time to get used to the idea.

http://arxiv.org/abs/astro-ph/0701584
Constraints on Dark Energy from Supernovae, Gamma Ray Bursts, Acoustic Oscillations, Nucleosynthesis and Large Scale Structure and the Hubble constant
Edward L. Wright (UCLA)
16 pages Latex with 8 Postscript figure files

"The luminosity distance vs. redshift law is now measured using supernovae and gamma ray bursts, and the angular size distance is measured at the surface of last scattering by the CMB and at z = 0.35 by baryon acoustic oscillations. In this paper this data is fit to models for the equation of state with w = -1, w = const, and w(z) = w_0+w_a(1-a). The last model is poorly constrained by the distance data, leading to unphysical solutions where the dark energy dominates at early times unless the large scale structure and acoustic scale constraints are modified to allow for early time dark energy effects. A flat LambdaCDM model is consistent with all the data."
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