Imprints of primordial non-Gaussianities on large-scale structure: Scale-dependent bias and abundance of virialized objects

Neal Dalal, Olivier Doré, Dragan Huterer, Alexander Shirokov

Research output: Contribution to journalArticlepeer-review

Abstract

We study the effect of primordial non-Gaussianity on large-scale structure, focusing upon the most massive virialized objects. Using analytic arguments and N-body simulations, we calculate the mass function and clustering of dark matter halos across a range of redshifts and levels of non-Gaussianity. We propose a simple fitting function for the mass function valid across the entire range of our simulations. We find pronounced effects of non-Gaussianity on the clustering of dark matter halos, leading to strongly scale-dependent bias. This suggests that the large-scale clustering of rare objects may provide a sensitive probe of primordial non-Gaussianity. We very roughly estimate that upcoming surveys can constrain non-Gaussianity at the level of |fNL| 10, which is competitive with forecasted constraints from the microwave background.

Original languageEnglish (US)
Article number123514
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number12
DOIs
StatePublished - Jun 11 2008

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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