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What do galaxy surveys really measure?

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If you have a question about this talk, please contact Ian A. Morrison .

Galaxy redshift surveys measure the distribution of galaxies as a function of redshift. This observation is then used to infer the underlying matter power spectrum and learn about structure formation and cosmological parameters. The link between observation and matter density is however not as simple as it is usually assumed. It is known since a long time, that galaxy number density measurements are affected by redshift-space distortion. In this talk I will show that in addition to this well-known correction, various relativistic effects enter in the relation between the observed galaxy number density and the underlying physical quantities. I will show how to express the observable in terms of gauge invariant variables and I will discuss the various corrections to the standard result.

This talk is part of the DAMTP Friday GR Seminar series.

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