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.
- Authors:
-
- Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA, 16802 (United States)
- Department of Astronomy, University of Illinois, 1002 W. Green St., Urbana, IL, 61801 (United States)
- Publication Date:
- OSTI Identifier:
- 22373500
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2014; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; COMPARATIVE EVALUATIONS; DISTURBANCES; FLUCTUATIONS; MASS; PERTURBATION THEORY; SIMULATION; STATISTICS; STOCHASTIC PROCESSES
Citation Formats
Adhikari, Saroj, Shandera, Sarah, and Dalal, Neal. Higher moments of primordial non-Gaussianity and N-body simulations. United States: N. p., 2014.
Web. doi:10.1088/1475-7516/2014/06/052.
Adhikari, Saroj, Shandera, Sarah, & Dalal, Neal. Higher moments of primordial non-Gaussianity and N-body simulations. United States. https://doi.org/10.1088/1475-7516/2014/06/052
Adhikari, Saroj, Shandera, Sarah, and Dalal, Neal. 2014.
"Higher moments of primordial non-Gaussianity and N-body simulations". United States. https://doi.org/10.1088/1475-7516/2014/06/052.
@article{osti_22373500,
title = {Higher moments of primordial non-Gaussianity and N-body simulations},
author = {Adhikari, Saroj and Shandera, Sarah and Dalal, Neal},
abstractNote = {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.},
doi = {10.1088/1475-7516/2014/06/052},
url = {https://www.osti.gov/biblio/22373500},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 06,
volume = 2014,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 2014},
month = {Sun Jun 01 00:00:00 EDT 2014}
}