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SUMMARY:Einstein's Universe: Cosmological structure formation in numerical
  relativity - Hayley Macpherson
DTSTART:20200205T131500Z
DTEND:20200205T134500Z
UID:TALK136978@talks.cam.ac.uk
CONTACT:Catrina Diener
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 the
 refore smoothing over highly nonlinear structures on small scales. This sm
 oothing feeds back onto the large-scale evolution of the Universe in the c
 ontext of nonlinear General Relativity. In addition\, small-scale curvatur
 e will affect light propagation\, and hence our observations. The effect o
 f this smoothing process\, and the extent to which our observations will b
 e affected\, can only be fully addressed using numerical relativity. I wil
 l describe our simulations using the Einstein Toolkit to evolve cosmologic
 al large-scale structure with full numerical relativity. I will present ou
 r results of averaging a truly inhomogeneous\, anisotropic matter distribu
 tion and the effect this has on the large-scale evolution of the Universe.
LOCATION:Sackler Lecture Theatre\, IoA
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