Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-25
Phys.Rev.D77:123514,2008
Astronomy and Astrophysics
Astrophysics
16 pages, color figures, revtex4. v2: added references and an equation. submitted to PRD. v3: simplified derivation, additiona
Scientific paper
10.1103/PhysRevD.77.123514
We study the effect of primordial nongaussianity 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 nongaussianity. We propose a simple fitting function for the mass function valid across the entire range of our simulations. We find pronounced effects of nongaussianity 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 nongaussianity. We very roughly estimate that upcoming surveys can constrain nongaussianity at the level |fNL| <~ 10, competitive with forecasted constraints from the microwave background.
Dalal Neal
Doré Olivier
Huterer Dragan
Shirokov Alexander
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