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SUMMARY:The cosmological constant and inhomogeneity at late times - Benjam
 in Withers (Durham)
DTSTART:20111121T130000Z
DTEND:20111121T140000Z
UID:TALK32725@talks.cam.ac.uk
CONTACT:Dr Sebastien Renaux-Petel
DESCRIPTION:An observer in a cosmological constant dominated universe will
  experience de Sitter at late times. Heuristically a positive cosmological
  constant causes inhomogeneous and anisotropic contributions to dilute as 
 the universe expands\, allowing inhomogeneity to be systematically control
 led by a late time expansion. I will apply a late time expansion to a Lamb
 da-CDM universe\, computing both cosmological solutions and luminosity dis
 tance as a function of redshift. The resulting expressions are nonlinear i
 n the inhomogeneity and systematically characterise Lambda-CDM cosmologies
  which end in cosmological constant domination. Applied to Union 2 superno
 vae data the leading late time anisotropic correction can be measured\, wh
 ich takes the form of a large scale curvature tensor\, whose components ar
 e found to be zero at the level of one part in 1000. With more data higher
  order inhomogeneous corrections can be measured.\n
LOCATION:CMS\, Pav.B\, CTC Common Room (B1.19)
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