☆ 4.6 Article

Scale dependence of halo bispectrum from non-Gaussian initial conditions in cosmological N-body simulations

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2010)

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Journal

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/07/002

Keywords

cosmological simulations; cosmological parameters from LSS; redshift surveys

Categories

Astronomy & Astrophysics Physics, Particles & Fields

Funding

  1. STFC [ST/H002774/1, PP/E001033/1] Funding Source: UKRI
  2. Engineering and Physical Sciences Research Council [EP/C500067/1] Funding Source: researchfish
  3. Science and Technology Facilities Council [ST/H002774/1, PP/E001033/1] Funding Source: researchfish

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We study the halo bispectrum from non-Gaussian initial conditions. Based on a set of large N-body simulations starting from initial density fields with local type non-Gaussianity, we find that the halo bispectrum exhibits a strong dependence on the shape and scale of Fourier space triangles near squeezed configurations at large scales. The amplitude of the halo bispectrum roughly scales as f(NL)(2). The resultant scaling on the triangular shape is consistent with that predicted by Jeong & Komatsu based on perturbation theory. We systematically investigate this dependence with varying redshifts and halo mass thresholds. It is shown that the f(NL) dependence of the halo bispectrum is stronger for more massive haloes at higher redshifts. This feature can be a useful discriminator of inflation scenarios in future deep and wide galaxy redshift surveys.

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