Errors in Estimating Omega_Lambda due to the Fluid Approximation

Details Errors in Estimating Omega_Lambda due to the Fluid Approximation Errors in Estimating Omega_Lambda due to the Fluid Approximation

2009-08-31

arxiv.org/abs/0908.4488v2

JCAP 10, 26 (2009)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 2 figures

Scientific paper

The matter content of the Universe is strongly inhomogeneous on small scales. Motivated by this fact, we consider a model of the Universe that has regularly spaced discrete masses, rather than a continuous fluid. The optical properties of such space-times can differ considerably from the continuous fluid case, even if the 'average' dynamics are the same. We show that these differences have consequences for cosmological parameter estimation, and that fitting to recent supernovae observations gives a correction to the inferred value of Omega_Lambda of ~10%.

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