Effects of voids on the reconstruction of the equation of state of Dark Energy

Abstract

We quantify the effects of the voids known to exist in the Universe upon the reconstruction of the dark energy equation of state $w$. We show that the effect can start to be comparable with some of the other errors taken into account when analysing supernova data, depending strongly upon the low redshift cut-off used in the sample. For the supernova data alone, the error induced in the reconstruction of $w$ is much larger than the percent level. When the Baryonic Acoustic Oscillations and the CMB data are included in the fit, the effect of the voids upon the determination of $w$ is much lessened, but is not much smaller than some of the other errors taken into consideration when performing such fits.

6 pages, 4 figures

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• CMB seen through random Swiss Cheese
• Halo abundances and shear in void models
• How real-time cosmology can distinguish between different anisotropic models
• Cosmology when living near the Great Attractor
• Non-comoving baryons and cold dark matter in cosmic voids
• Conditions for low-redshift positive apparent acceleration in smooth inhomogeneous models
• Systematic error due to isotropic inhomogeneities
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• Constraining the Equation of State of Dark Energy with Gamma Rays
• Can we remove the systematic error due to isotropic inhomogeneities?
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