Local stochastic non-Gaussianity and N-body simulations

Abstract

Large-scale clustering of highly biased tracers of large-scale structure has emerged as one of the best observational probes of primordial non-Gaussianity of the local type (i.e. f_{NL}^{local}). This type of non-Gaussianity can be generated in multifield models of inflation such as the curvaton model. Recently, Tseliakhovich, Hirata, and Slosar showed that the clustering statistics depend qualitatively on the ratio of inflaton to curvaton power ξafter reheating, a free parameter of the model. If ξis significantly different from zero, so that the inflaton makes a non-negligible contribution to the primordial adiabatic curvature, then the peak-background split ansatz predicts that the halo bias will be stochastic on large scales. In this paper, we test this prediction in N-body simulations. We find that large-scale stochasticity is generated, in qualitative agreement with the prediction, but that the level of stochasticity is overpredicted by ~30%. Other predictions, such as ξindependence of the halo bias, are confirmed by the simulations. Surprisingly, even in the Gaussian case we do not find that halo model predictions for stochasticity agree consistently with simulations, suggesting that semi-analytic modeling of stochasticity is generally more difficult than modeling halo bias.

v3: minor changes matching published version

References in corpus (17)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Transients from Initial Conditions in Cosmological Simulations
• The halo mass function from the dark ages through the present day
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• Optimal limits on f_{NL}^{local} from WMAP 5-year data
• Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
• Minimizing the stochasticity of halos in large-scale structure surveys
• Primordial non-Gaussianity: large-scale structure signature in the perturbative bias model
• Non-Gaussianities in New Ekpyrotic Cosmology
• How to suppress the shot noise in galaxy surveys
• Non-Gaussianities from ekpyrotic collapse with multiple fields
• Constraining Primordial Non-Gaussianity with High-Redshift Probes
• Non-Gaussian halo assembly bias
• Non-Gaussianity and large-scale structure in a two-field inflationary model

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