How accurate is our knowledge of galaxy bias?

Understand

Observations of the clustering of galaxies can provide useful information about the distribution of dark matter in the Universe.

• In order to extract accurate cosmological parameters from galaxy surveys, it is important to understand how the distribution of galaxies is biased with respect to the matter distribution.
• The large-scale bias of galaxies can be quantified either by directly measuring the large-scale ({\lambda} >~ 60 hinv Mpc) power spectrum of galaxies or by modeling the halo occupation distribution of galaxies using their clustering on small scales ({\lambda} <~ 30 hinv Mpc).
• We compare the luminosity dependence of the galaxy bias (both the shape and the normalization) obtained by these methods and check for consistency.