Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias

Abstract

We consider whether the non-Gaussian scale-dependent halo bias can be used not only to constrain the local form of non-Gaussianity but also to distinguish among different shapes. In particular, we ask whether it can constrain the behavior of the primordial three-point function in the squeezed limit where one of the momenta is much smaller than the other two. This is potentially interesting since the observation of a three-point function with a squeezed limit that does not go like the local nor equilateral templates would be a signal of non-trivial dynamics during inflation. To this end we use the quasi-single field inflation model of Chen and Wang as a representative two-parameter model, where one parameter governs the amplitude of non-Gaussianity and the other the shape. We also perform a model-independent analysis by parametrizing the scale-dependent bias as a power-law on large scales, where the power is to be constrained from observations. We find that proposed large-scale structure surveys (with characteristics similar to the dark energy task force stage IV surveys) have the potential to distinguish among the squeezed limit behavior of different bispectrum shapes for a wide range of fiducial model parameters. Thus the halo bias can help discriminate between different models of inflation.

12 pages, 3 figures, v2. minor corrections to the text, matches JCAP published version

References in corpus (12)

• The Effective Field Theory of Inflation
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Measuring primordial non-gaussianity without cosmic variance
• Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
• The (not so) squeezed limit of the primordial 3-point function
• Optimal Constraints on Local Primordial Non-Gaussianity from the Two-Point Statistics of Large-Scale Structure
• Non-Gaussian Halo Bias Re-examined: Mass-dependent Amplitude from the Peak-Background Split and Thresholding
• Accurate Predictions for the Scale-Dependent Galaxy Bias from Primordial Non-Gaussianity
• N-body simulations with generic non-Gaussian initial conditions II: Halo bias
• Constraining inflation with future galaxy redshift surveys
• The clustering of galaxies and galaxy clusters: constraints on primordial non-Gaussianity from future wide-field surveys
• Optimal dataset combining in f_nl constraints from large scale structure in an idealised case

Cited by in corpus (46)

• Cosmology and Fundamental Physics with the Euclid Satellite
• Cosmology and fundamental physics with the Euclid satellite
• Quasi-Single Field Inflation with Large Mass
• Inflation, Cosmic Perturbations and Non-Gaussianities
• Standard Model Background of the Cosmological Collider
• Prospects for Cosmological Collider Physics
• Standard Model Mass Spectrum in Inflationary Universe
• Neutrino Signatures in Primordial Non-Gaussianities
• Galaxy Bispectrum from Massive Spinning Particles
• The Future of Primordial Features with Large-Scale Structure Surveys
• Stochastic Bias from Non-Gaussian Initial Conditions
• Detecting higher spin fields through statistical anisotropy in the CMB and galaxy power spectra
• Cosmological Signatures of Superheavy Dark Matter
• Landscape tomography through primordial non-Gaussianity
• Classical Cosmological Collider Physics and Primordial Features
• Collective Symmetry Breaking and Resonant Non-Gaussianity
• The goldstone and goldstino of supersymmetric inflation
• Quantum Primordial Standard Clocks
• Disentangling mass spectra of multiple fields in cosmological collider
• Anomalous Dimensions and Non-Gaussianity
• On the Effective Field Theory for Quasi-Single Field Inflation
• Biasing and the search for primordial non-Gaussianity beyond the local type
• Warm Quasi-Single Field Inflation
• Quantum Standard Clocks in the Primordial Trispectrum
• Heavy Spinning Particles from Signs of Primordial Non-Gaussianities: Beyond the Positivity Bounds
• Constraining the initial conditions of the Universe using large scale structure
• Axion Isocurvature Collider
• Continuous Spectrum on Cosmological Collider
• The Power of Locality: Primordial Non-Gaussianity at the Map Level
• Cosmic variance in inflation with two light scalars
• Khronon inflation
• Light Fields during Inflation from BOSS and Future Galaxy Surveys
• Hybrid Quasi-Single Field Inflation
• Constraints on Primordial non-Gaussianity from Future HI Intensity Mapping Experiments
• Testing Split Supersymmetry with Inflation
• Analytic Formulae for Inflationary Correlators with Dynamical Mass
• Perturbative unitarity in quasi-single field inflation
• On the equation-of-motion versus in-in approach in cosmological perturbation theory
• Non-Gaussian Shape Recognition
• Fingerprints of a Non-Inflationary Universe from Massive Fields
• Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys
• The 21cm Power Spectrum and the Shapes of Non-Gaussianity
• Simultaneous effect of Modified Gravity and Primordial Non-Gaussianity in Large Scale Structure Observations
• Mild quasi-local non-Gaussianity as a signature of modified gravity during inflation
• Schwinger-Keldysh mechanism in extended quasi single field inflation
• On the importance of heavy fields in pseudo-scalar inflation