Modelling galaxy clustering in redshift space with a Lagrangian bias formalism and $N$-body simulations

Understand

Improving the theoretical description of galaxy clustering on small scales is an important challenge in cosmology, as it can considerably increase the scientific return of forthcoming galaxy surveys -- e.g.

• tightening the bounds on neutrino masses and deviations from general relativity.
• In this paper, we propose and test a new model for the clustering of galaxies that is able to accurately describe redshift-space distortions even down to small scales.
• This model corresponds to a second-order perturbative Lagrangian bias expansion which is advected to Eulerian space employing a displacement field extracted from $N$-body simulations.