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GR: Fachverband Gravitation und Relativitätstheorie
GR 2: Kosmologie I
GR 2.1: Talk
Monday, February 27, 2012, 15:30–15:50, ZHG 002
Backreaction in the relativistic Zel'dovich approximation — •Alexander Wiegand1, Thomas Buchert2, and Charly Nayet2 — 1Fakultät für Physik, Universität Bielefeld, Deutschland — 2Centre de Recherche Astrophysique de Lyon, Frankreich
Zel'dovich's approximation is in Newtownian cosmology a practical tool to investigate the evolution of mildly nonlinear regions of the Universe. Its extension to the relativistic case is important for the investigation of the backreaction of inhomogeneities on the evolution history of spatial domains of the Universe. This talk presents a Lagrangian framework that allows for a one to one correspondence of Newtownian and general relativistic quantities and provides a perturbative backreaction model, together with domain-dependent quantitiative estimates of the backreaction effect.