Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 706, Issue 1, Pages L91-L95Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/706/1/L91
Keywords
galaxies: clusters: general; galaxies: halos; large-scale structure of universe
Categories
Funding
- FP7-PEOPLE-2007-4-3-IRG [202182]
- MICINN [AYA2008-03531]
- ASI [I/016/07/0]
- ICREA Funding Source: Custom
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We consider the description of the clustering of halos for physically motivated types of non-Gaussian initial conditions. In particular, we include non-Gaussianity of the type arising from single-field slow roll, multifields, curvaton ( local type), higher-order derivative type ( equilateral), vacuum-state modifications ( enfolded type), and horizon-scale GR corrections type. We show that large-scale halo bias is a very sensitive tool for probing non-Gaussianity, potentially leading, for some planned surveys, to a detection of non-Gaussianity arising from horizon-scale GR corrections. In tandem with cosmic microwave background constraints, the halo bias approach can help enormously to discriminate among different shapes of non-Gaussianity and thus among models for the origin of cosmological perturbations.
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