Redshift Distortions: Perturbative and N-body Results

Abstract

I discuss the evolution of the redshift-space bispectrum via perturbation theory (PT) and large high-resolution numerical simulations. At large scales, we give the multipole expansion of the bispectrum in PT, which provides a natural way to break the degeneracy between bias and $Ω$ present in measurements of the power spectrum distortions. At intermediate scales, we propose a simple phenomenological model to take into account non-linear effects. N-body results show that at small scales the perturbative shape of the bispectrum monopole in redshift-space is preserved, breaking the hierarchical form valid in the absence of distortions.