Probing Dark Matter Isocurvature with Primordial Non-Gaussianity
arXiv:2405.09607 · doi:10.1088/1475-7516/2024/12/018
Abstract
Multiple fields can become dynamical during the inflationary epoch. We consider an example where a light field acquires isocurvature fluctuations during inflation and contributes to the dark matter abundance at late times. Interactions between the light field and the adiabatic sector contribute to mixed adiabatic-isocurvature non-Gaussianity (NG). We show the resulting form of NG has a different kinematic dependence than the 'local shape' commonly considered, and highlight the parameter space where a dedicated search is expected to significantly improve the current sensitivity. We interpret our results in the context of the QCD axion and illustrate how the proposed NG searches can improve upon the existing searches for isocurvature power spectrum and bispectrum.
arXiv comment17 pages, 4 figures
References in corpus (33)
- Planck 2018 results. X. Constraints on inflation
- Generating the curvature perturbation without an inflaton
- Non-Gaussianity from Inflation: Theory and Observations
- The Effective Field Theory of Inflation
- Acoustic Signatures in the Primary Microwave Background Bispectrum
- Adiabatic CMB perturbations in pre-big bang string cosmology
- Effects of Cosmological Moduli Fields on Cosmic Microwave Background
- The primordial density perturbation in the curvaton scenario
- Cosmological perturbations
- Primordial Non-Gaussianities from Inflation Models
- Quasi-Single Field Inflation and Non-Gaussianities
- The shape of non-Gaussianities
- Non-Gaussianities in Single Field Inflation and their Optimal Limits from the WMAP 5-year Data
- Non-Gaussianity of the primordial perturbation in the curvaton model
- Limits on non-Gaussianities from WMAP data
- On non-gaussianities in single-field inflation
- On Non-Gaussianity in the Curvaton Scenario
- Cosmological Collider Physics
- The Effective Field Theory of Multifield Inflation
- Non-Gaussianity from Inflation
- The shape of primordial non-Gaussianity and the CMB bispectrum
- Non-linear isocurvature perturbations and non-Gaussianities
- Upper Limit on the QCD Axion Mass from Isolated Neutron Star Cooling
- Non-Gaussianity from isocurvature perturbations
- A General Analysis of Non-Gaussianity from Isocurvature Perturbations
- Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
- Isocurvature modes in the CMB bispectrum
- On the non-Gaussianity from Recombination
- Hunting for Isocurvature Modes in the CMB non-Gaussianities
- Fundamental limits on constraining primordial non-Gaussianity
- Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations
- Snowmass Cosmic Frontier Report
- Isocurvature modes: joint analysis of the CMB power spectrum and bispectrum