Large-scale homogeneity vs. small- scale inhomogeneity: testing ...
Large-scale homogeneity vs. small- scale inhomogeneity: testing ...
Large-scale homogeneity vs. small- scale inhomogeneity: testing ...
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In<strong>homogeneity</strong>: alternative to Dark<br />
• Is ‘perturbed FRW’ a valid description?<br />
• <strong>Large</strong> inhomogeneities → breakdown of FRW<br />
01/18/2013<br />
− Light paths distorted: distances inferred from redshifts are<br />
wrong (e.g. Wiltshire 2010)<br />
− “Averaging problem” and<br />
backreaction: different-density<br />
regions evolve differently, can have<br />
global accelerated expansion<br />
without Dark Energy<br />
(e.g. Buchert 2007, Li & Schwarz<br />
2009, Räsänen 2011)<br />
− Void models, e.g. Lemaître-<br />
Tolman-Bondi model<br />
Energy?<br />
Image: hubblesite.org<br />
Morag I. Scrimgeour 5