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Title: What Galaxy Surveys Really Measure: Relativistic Corrections to the Measured Galaxy Power Spectrum
Originating Office: IAS
Speaker: Durrer, Ruth
Issue Date: 1-Jun-2011
Event Date: 1-Jun-2011
Group/Series/Folder: Record Group 8.15 - Institute for Advanced Study
Series 3 - Audio-visual Materials
Location: 8.15:3 box 1.7
Notes: IAS Conference on Cosmology since Einstein.
IAS title: Talk 15: 'What Do Galaxy Surveys Really Measure?'.
Abstract: In large galaxy surveys which go out to redshift z=1 or more, relativistic effects, e.g. from the fact that our observations are not on a spatial hypersurface but on the past lightcone which itself is perturbed by structure formation, can no longer be neglected.
Prof Durrer presents these effects to first order in perturbation theory and propose and angular and redshift power spectrum which are both directly observable.
We see that the complications due to the fact that we only observe on our past lightcone and that we do not truly know the distance of the observed galaxy, but only its redshift, is not only an additional difficulty, but especially a new opportunity for future galaxy surveys.
Duration: 40 min.
Appears in Series:8.15:3 - Audio-visual Materials
Videos for Public -- Distinguished Lectures