skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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:
;  [1];  [2]
  1. Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA, 16802 (United States)
  2. 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}
}