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Title: N-body simulations with generic non-Gaussian initial conditions II: halo bias

Abstract

We present N-body simulations for generic non-Gaussian initial conditions with the aim of exploring and modelling the scale-dependent halo bias. This effect is evident on very large scales requiring large simulation boxes. In addition, the previously available prescription to implement generic non-Gaussian initial conditions has been improved to keep under control higher-order terms which were spoiling the power spectrum on large scales. We pay particular attention to the differences between physical, inflation-motivated primordial bispectra and their factorizable templates, and to the operational definition of the non-Gaussian halo bias (which has both a scale-dependent and an approximately scale-independent contributions). We find that analytic predictions for both the non-Gaussian halo mass function and halo bias work well once a fudge factor (which was introduced before but still lacks convincing physical explanation) is calibrated on simulations. The halo bias remains therefore an extremely promising tool to probe primordial non-Gaussianity and thus to give insights into the physical mechanism that generated the primordial perturbations. The simulation outputs and tables of the analytic predictions will be made publicly available via the non-Gaussian comparison project web site http://icc.ub.edu/∼liciaverde/NGSCP.html.

Authors:
;  [1]
  1. ICC, University of Barcelona (IEEC-UB), Martí i Franquès 1, Barcelona 08028 (Spain)
Publication Date:
OSTI Identifier:
22280079
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 03; 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; APPROXIMATIONS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DISTURBANCES; ENERGY SPECTRA; INFLATIONARY UNIVERSE; INFLATONS; MASS

Citation Formats

Wagner, Christian, and Verde, Licia. N-body simulations with generic non-Gaussian initial conditions II: halo bias. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/03/002.
Wagner, Christian, & Verde, Licia. N-body simulations with generic non-Gaussian initial conditions II: halo bias. United States. https://doi.org/10.1088/1475-7516/2012/03/002
Wagner, Christian, and Verde, Licia. 2012. "N-body simulations with generic non-Gaussian initial conditions II: halo bias". United States. https://doi.org/10.1088/1475-7516/2012/03/002.
@article{osti_22280079,
title = {N-body simulations with generic non-Gaussian initial conditions II: halo bias},
author = {Wagner, Christian and Verde, Licia},
abstractNote = {We present N-body simulations for generic non-Gaussian initial conditions with the aim of exploring and modelling the scale-dependent halo bias. This effect is evident on very large scales requiring large simulation boxes. In addition, the previously available prescription to implement generic non-Gaussian initial conditions has been improved to keep under control higher-order terms which were spoiling the power spectrum on large scales. We pay particular attention to the differences between physical, inflation-motivated primordial bispectra and their factorizable templates, and to the operational definition of the non-Gaussian halo bias (which has both a scale-dependent and an approximately scale-independent contributions). We find that analytic predictions for both the non-Gaussian halo mass function and halo bias work well once a fudge factor (which was introduced before but still lacks convincing physical explanation) is calibrated on simulations. The halo bias remains therefore an extremely promising tool to probe primordial non-Gaussianity and thus to give insights into the physical mechanism that generated the primordial perturbations. The simulation outputs and tables of the analytic predictions will be made publicly available via the non-Gaussian comparison project web site http://icc.ub.edu/∼liciaverde/NGSCP.html.},
doi = {10.1088/1475-7516/2012/03/002},
url = {https://www.osti.gov/biblio/22280079}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2012,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2012},
month = {Thu Mar 01 00:00:00 EST 2012}
}