TH Cosmo Coffee

Investigations into dark matter halo bias

by Titouan Lazeyras (MPA)

4/2-011 - TH common room (CERN)

4/2-011 - TH common room


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A key ingredient in extracting cosmological information from galaxy surveys is to link the distribution of discrete Large-Scale Structure tracers (such as galaxies) to that of the underlying continuous dark matter field. This is achieved through the so-called bias formalism. After motivating and introducing in details this formalism, I will present two different techniques to measure the parameters entering the model (the bias parameters) up to third order: separate universe simulations and the tree-level trispectrum. I will present some of the most precise measurements to date for several bias parameters, obtained using gravity only numerical simulations, and comment on them.