Quijote-png: Simulations of primordial non-gaussianity and the information content of the matter field power spectrum and bispectrum
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Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
Primordial non-Gaussianity (PNG) is one of the most powerful probes of the early universe, and measurements of
the large-scale structure of the universe have the potential to transform our understanding of this area. However,
relating measurements of the late-time universe to the primordial perturbations is challenging due to the nonlinear
processes that govern the evolution of the universe. To help address this issue, we release a large suite of N-body
simulations containing four types of PNG: QUIJOTE-PNG. These simulations were designed to augment the
QUIJOTE suite of simulations that explored the impact of various cosmological parameters on large-scale structure
observables. Using these simulations, we investigate how much information on PNG can be extracted by extending
power spectrum and bispectrum measurements beyond the perturbative regime at z = 0.0. This is the first joint
analysis of the PNG and cosmological information content accessible with power spectrum and bispectrum
measurements of the nonlinear scales. We find that the constraining power improves significantly up to
kmax 0.3 Mpc h » -1
, with diminishing returns beyond as the statistical probes signal-to-noise ratios saturate. This
saturation emphasizes the importance of accurately modeling all the contributions to the covariance matrix.
Further, we find that combining the two probes is a powerful method of breaking the degeneracies with the ΛCDM
parameters.
Description
Keywords
Astronomy, Physics, Non-Gaussianity, Cosmology, Cosmological parameters
Citation
Coulton, W. R. et al. (2023). Quijote-png: Simulations of primordial non-gaussianity and the information content of the matter field power spectrum and bispectrum. Astrophysical Journal, 943(1), 64. 10.3847/1538-4357/aca8a7