Karlsruhe 2011 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 8: Kosmologie

GR 8.6: Vortrag

Donnerstag, 31. März 2011, 10:10–10:30, 20.40: 101

Fluctuations of cosmic parameters in the local universe — •Alexander Wiegand and Dominik Schwarz — Fakultät für Physik, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld

Many cosmological observations use measurements in the local universe to determine the global cosmic parameters. As there are pronounced structures on these relatively small scales, the local values are not necessarily representative for the average universe. The talk will address the question how big this cosmic variance still is in the era of deep galaxy surveys, i.e. quantify this fundamental uncertainty in surveys with different geometries. Furthermore, the influence of these fluctuations on the evolution of the local volume will be discussed. As especially the curvature parameter is affected by a relatively large variance, it will finally be shown how this affects other observables.