Invited Presentation

Reconstructing power spectrum of dark matter halos from observed galaxy distribution

Author(s): Teppei Okumura (ASIAA)

Presenter: Teppei Okumura (ASIAA)

Revealing acceleration of the cosmic expansion is one of the most important issues in cosmology. The mysterious dark energy could be driving the acceleration, or gravity law predicted from Einstein’s theory of general relativity could be breaking down at cosmological scales. To investigate the origin of the acceleration, observations of large-scale structure of the Universe traced by galaxy surveys are considered as the best probe. In this talk, I will first demonstrate that the accuracy of the current theoretical models for extracting the dark energy or gravity properties is not high enough for the future precision surveys such as the Subaru PFS surveys. Particularly, incorrect modeling of kinematics of satellite galaxies easily leads to a wrong constraint on gravity theories. We present a new approach to overcome this problem. In this approach satellite galaxies are effectively excluded by cylinder-grouping method and a model is constructed to correct for the incorrect exclusion of satellites. We then reconstruct the power spectrum of dark matter halos. We apply this model to a mock galaxy catalog of the SDSS-III survey and find it can predict the halo power spectra up to very small scales to within 5 per cent.