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28 March 2024
 
  » arxiv » 1109.2484

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Interpreting supernovae observations in a lumpy universe
Chris Clarkson ; George Ellis ; Andreas Faltenbacher ; Roy Maartens ; Obinna Umeh ; Jean-Philippe Uzan ;
Date 12 Sep 2011
AbstractLight from ’point sources’ such as supernovae is observed with a beam width of order of the sources’ size -- typically less than 1 AU. Such a beam probes matter and curvature distributions that are very different from coarse-grained representations in N-body simulations or perturbation theory, which are smoothed on scales much larger than 1 pc. The beam typically travels through unclustered dark matter and hydrogen with a mean density much less than the cosmic mean, and through dark matter mini-halos and hydrogen clouds. Large dark matter halos are rarely encountered directly and so are mainly experienced through their Weyl (tidal) curvature. How observations of many such beams averages this Weyl curvature into the Ricci curvature of the background is not understood. If modelled incorrectly this can lead to significant changes to the inferred background cosmology. Standard analyses predict a huge variance for such tiny beam sizes, and non-linear corrections appear to be non-trivial. By considering different reasonable approximations which yield very different cosmologies we argue that modelling ultra-narrow beams accurately is a critical problem for precision cosmology.
Source arXiv, 1109.2484
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