Vortragsdetails

Montag, 8. Dezember 2014 - 11:00

Sven Meyer (ZAH/ITA):

"Evolution of linear perturbations in Lemaîre-Tolman-Bondi models"

Zusammenfassung. We try to apply linear perturbation theory to a special class of inhomogeneous cosmological models, namely Lemaîre-Tolman-Bondi (LTB) models. They describe inhomogeneous dust solutions of Einstein's field equations that are isotropic around a central point, but anisotropic everywhere else. Those models became attractive since they allow to fit the distance-redshift relation of Type Ia-Supernovae without need of a cosmological constant or dark energy fluid. In this context, our galaxy is assumed to be located close to the centre of a Gpc-scale underdense region, a so called void. I'll try give an overview on LTB models, point out a possibility to set-up linear perturbations and show first numerical results for their time evolution.