Errors in Estimating Omega Lambda due to the Fluid Approximation - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: 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 regularlyspaced discrete masses, rather than a continuous fluid. The optical propertiesof such space-times can differ considerably from the continuous fluid case,even if the -average- dynamics are the same. We show that these differenceshave consequences for cosmological parameter estimation, and that fitting torecent supernovae observations gives a correction to the inferred value ofOmega Lambda of ~10%.



Author: Timothy Clifton, Pedro G. Ferreira

Source: https://arxiv.org/







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