Higher moments of primordial non-Gaussianity and N-body simulations

Abstract

We perform cosmological N-body simulations with non-Gaussian initial conditions generated from two independent fields. The dominant contribution to the perturbations comes from a purely Gaussian field, but we allow the second field to have local non-Gaussianity that need not be weak. This scenario allows us to adjust the relative importance of non-Gaussian contributions beyond the skewness, producing a scaling of the higher moments different from (and stronger than) the scaling in the usual single field local ansatz. We compare semi-analytic prescriptions for the non-Gaussian mass function, large scale halo bias, and stochastic bias against the simulation results. We discuss applications of this work to large scale structure measurements that can test a wider range of models for the primordial fluctuations than is usually explored.

35 pages, 14 figures, minor corrections and clarifications added to the text to match the JCAP published version

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Cited by in corpus (4)

• The Hunt for Primordial Interactions in the Large Scale Structures of the Universe
• Probing higher-order primordial non-Gaussianity with galaxy surveys
• Cosmology with the Square Kilometre Array by SKA-Japan
• Relativistic second-order initial conditions for simulations of large-scale structure