Quijote PNG: The information content of the halo power spectrum and bispectrum

Abstract

We investigate how much can be learnt about four types of primordial non-Gaussianity (PNG) from small-scale measurements of the halo field. Using the QUIJOTE-PNG simulations, we quantify the information content accessible with measurements of the halo power spectrum monopole and quadrupole, the matter power spectrum, the halo-matter cross spectrum and the halo bispectrum monopole. This analysis is the first to include small, non-linear scales, up to $k_{\max }=0.5h/Mpc$, and to explore whether these scales can break degeneracies with cosmological and nuisance parameters making use of thousands of N-body simulations. We perform all the halo measurements in redshift space with a single sample comprised of all halos with mass $>3.2\times 10^{13}{h}^{-1}{M}_{\odot }$. For local PNG, measurements of the scale dependent bias effect from the power spectrum using sample variance cancellation provide significantly tighter constraints than measurements of the halo bispectrum. In this case measurements of the small scales add minimal additional constraining power. In contrast, the information on equilateral and orthogonal PNG is primarily accessible through the bispectrum. For these shapes, small scale measurements increase the constraining power of the halo bispectrum by up to $\times 4$, though the addition of scales beyond $k\approx 0.3h/Mpc$ improves constraints largely through reducing degeneracies between PNG and the other parameters. These degeneracies are even more powerfully mitigated through combining power spectrum and bispectrum measurements. However even with combined measurements and small scale information, equilateral non-Gaussianity remains highly degenerate with ${\sigma }_8$ and our bias model.

Updated to accepted version

References in corpus (34)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Effective Field Theory of Inflation
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Primordial Non-Gaussianities from Inflation Models
• Measuring primordial non-gaussianity without cosmic variance
• On the consistency relation of the 3-point function in single field inflation
• Constraints on primordial non-Gaussianity from 800,000 photometric quasars
• Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
• Constraining $M_{\nu }$ with the Bispectrum II: The Total Information Content of the Galaxy Bispectrum
• On the assumption of Gaussianity for cosmological two-point statistics and parameter dependent covariance matrices
• Einstein's legacy in galaxy surveys
• Primordial Non-Gaussianity from Biased Tracers: Likelihood Analysis of Real-Space Power Spectrum and Bispectrum
• Can we actually constrain $f_{\mathrm{NL}}$ using the scale-dependent bias effect? An illustration of the impact of galaxy bias uncertainties using the BOSS DR12 galaxy power spectrum
• Fewer Mocks and Less Noise: Reducing the Dimensionality of Cosmological Observables with Subspace Projections
• The observed galaxy power spectrum in General Relativity
• On the impact of galaxy bias uncertainties on primordial non-Gaussianity constraints
• Non-Gaussian halo assembly bias
• Maximal compression of the redshift space galaxy power spectrum and bispectrum
• Predictions for local PNG bias in the galaxy power spectrum and bispectrum and the consequences for $f_{\mathrm{NL}}$ constraints
• The Persistence of Large Scale Structures I: Primordial non-Gaussianity
• Primordial non-Gaussianity from the Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey I: Catalogue Preparation and Systematic Mitigation
• Quijote-PNG: Simulations of primordial non-Gaussianity and the information content of the matter field power spectrum and bispectrum
• Optimal dataset combining in f_nl constraints from large scale structure in an idealised case
• The Covariance of Squeezed Bispectrum Configurations
• Hunting high and low: Disentangling primordial and late-time non-Gaussianity with cosmic densities in spheres
• First Constraints on Small-Scale Non-Gaussianity from UV Galaxy Luminosity Functions
• The squeezed matter bispectrum covariance with responses
• Resilience of long modes in cosmological observables
• The Power of Locality: Primordial Non-Gaussianity at the Map Level
• Fundamental limits on constraining primordial non-Gaussianity
• Quijote-PNG: Quasi-maximum likelihood estimation of Primordial Non-Gaussianity in the non-linear dark matter density field
• Fisher Forecasts for Primordial non-Gaussianity from Persistent Homology
• Modal compression of the redshift-space galaxy bispectrum