The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects

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dc.creatorDalal, Neal
dc.creatorDoré, Olivier
dc.creatorHuterer, Dragan
dc.creatorShirokov, Alexander
dc.date2007-10-25
dc.date2008-03-27
dc.date.accessioned2026-07-07T11:38:19Z
dc.date.available2026-07-07T11:38:19Z
dc.descriptionWe 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.
dc.description16 pages, color figures, revtex4. v2: added references and an equation. submitted to PRD. v3: simplified derivation, additional references
dc.identifierhttps://arxiv.org/abs/0710.4560
dc.identifierhttp://arxiv.org/abs/0710.4560
dc.identifierPhys.Rev.D77:123514,2008
dc.identifierdoi:10.1103/PhysRevD.77.123514
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199522
dc.subjectAstrophysics
dc.titleThe imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
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