4.7 Article

The effect of primordial non-Gaussianity on halo bias

Journal

ASTROPHYSICAL JOURNAL LETTERS
Volume 677, Issue 2, Pages L77-L80

Publisher

UNIV CHICAGO PRESS
DOI: 10.1086/587840

Keywords

cosmology : theory; galaxies : clusters : general; galaxies : halos large-scale structure of universe

Funding

  1. ICREA Funding Source: Custom

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It has long been known how to analytically relate the clustering properties of the collapsed structures ( halos) to those of the underlying dark matter distribution for Gaussian initial conditions. Here we apply the same approach to physically motivated non-Gaussian models. The techniques we use were developed in the 1980s to deal with the clustering of peaks of non-Gaussian density fields. The description of the clustering of halos for non-Gaussian initial conditions has recently received renewed interest, motivated by the forthcoming large galaxy and cluster surveys. For inflationary-motivated non-Gaussianities, we find an analytic expression for the halo bias as a function of scale, mass, and redshift, employing only the approximations of high peaks and large separations.

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