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SUMMARY:Einstein's Universe: Cosmological structure formation in numerical
  relativity - Hayley Macpherson (University of Cambridge)
DTSTART:20191129T130000Z
DTEND:20191129T140000Z
UID:TALK132400@talks.cam.ac.uk
CONTACT:Nathan Johnson-McDaniel
DESCRIPTION:High-precision cosmological surveys are due to deliver measure
 ments accurate to the percent level. In order to ensure we correctly inter
 pret these data\, we need to be sure that our cosmological model is accura
 te. The current standard model assumes that the Universe is homogeneous an
 d isotropic. These assumptions are often justified by the fact that our Un
 iverse is homogeneous and isotropic on _large scales_\, however\, we are t
 herefore smoothing over highly nonlinear structures on small scales. This 
 smoothing feeds back onto the large-scale evolution of the Universe in the
  context of nonlinear General Relativity. In addition\, small-scale curvat
 ure will affect light propagation\, and hence our observations. The effect
  of this smoothing process\, and the extent to which our observations will
  be affected\, can only be fully addressed using numerical relativity.\nI 
 will describe our simulations using the Einstein Toolkit to evolve cosmolo
 gical large-scale structure with full numerical relativity. I will present
  our results of averaging a truly inhomogeneous\, anisotropic matter distr
 ibution and the effect this has on the large-scale evolution of the Univer
 se. 
LOCATION:Pavilion B Potter Room (B1.19)
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