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2008

The cosmic variance of Omega

Waterhouse, T. P., Zibin, J. P.

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How much can we know about our Universe? All of our observations are restricted to a finite volume, and therefore our estimates of presumably global cosmological parameters are necessarily based on incomplete information.

Even assuming that the Standard Model of cosmology is correct, this means that some cosmological questions may be unanswerable.
For example, is the curvature parameter Omega_K positive, negative, or identically zero? If its magnitude is sufficiently small, then due to cosmic variance no causal observation can ever answer that question.
In this article, we first describe the gauge problems associated with defining the cosmic variance of cosmological parameters, then describe a solution involving the use of parameters defined on the surface of last scattering, and finally calculate the statistical variance of ideal measurements of the matter, radiation, and curvature density parameters.

The cosmic variance of Omega · Around

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Then

A. Lewis, CAMB notes (2006), URL http://cosmologist.info/notes/CAMB.ps.gz
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Later among the works it cites.
E. Komatsu, J. Dunkley, M. R. Nolta, C. L. Bennett, B. Gold, G. Hinshaw, N. Jarosik, D. Larson, M. Limon, L. Page, et al. (2008), eprint arXiv:0803.0547 [astro-ph]
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J. P. Zibin and D. Scott (2008), in preparation
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