Journal
PHYSICAL REVIEW D
Volume 82, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.023004
Keywords
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Funding
- DOE [DE-FG02-95ER40899]
- NSF [AST-0807564]
- NASA [NNX09AC89G]
- National Aeronautics and Space Administration
- NASA [NNX09AC89G, 120366] Funding Source: Federal RePORTER
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It has recently been proposed that the large-scale bias of dark matter halos depends sensitively on primordial non-Gaussianity of the local form. In this paper we point out that the strong scale dependence of the non-Gaussian halo bias imprints a distinct signature on the covariance of cluster counts. We find that using the full covariance of cluster counts results in improvements on constraints on the non-Gaussian parameter f(NL) of 3 (1) orders of magnitude relative to cluster counts (counts + clustering variance) constraints alone. We forecast f(NL) constraints for the upcoming Dark Energy Survey in the presence of uncertainties in the mass-observable relation, halo bias, and photometric redshifts. We find that the Dark Energy Survey can yield constraints on non-Gaussianity of sigma(f(NL)) similar to 1-5 even for relatively conservative assumptions regarding systematics. Excess of correlations of cluster counts on scales of hundreds of megaparsecs would represent a smoking-gun signature of primordial non-Gaussianity of the local type.
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