Bonn 2010 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 11: Kosmologie 2

GR 11.2: Talk

Wednesday, March 17, 2010, 14:20–14:40, JUR K

Probing Backreaction Effects with Supernova Data — •Marina Seikel and Dominik J. Schwarz — Universität Bielefeld

As the Einstein equations are non-linear, spatial averaging and temporal evolution do not commute. Therefore, the evolution of the averaged universe is affected by inhomogeneities. It is, however, highly controversial how large these cosmological backreaction effects are. We use the supernova data of the Constitution set up to a redshift of 0.1 in order to analyse to what extent the measurement of the Hubble constant is affected. The size of the effect depends on the size of the volume that is averaged over. The observational results are then compared to the theory of the backreaction mechanism.