CMB constraint on non-Gaussianity in isocurvature perturbations
arXiv:1211.1095 · doi:10.1088/1475-7516/2013/07/007
Abstract
We study the CMB constraint on non-Gaussianity in CDM isocurvature perturbations. Non-Gaussian isocurvature perturbations can be produced in various models at the very early stage of the Universe. Since the isocurvature perturbations little affect the structure formation at late times, CMB is the best probe of isocurvature non-Gaussianity at least in the near future. In this paper, we focus on uncorrelated isocurvature perturbations and constrain their non-Gaussianity. For this purpose, we employ several state-of-art techniques for the analysis of CMB data and simulation. We use the WMAP 7 year data of temperature anisotropy. When the adiabatic perturbations are assumed to be Gaussian, we obtained a constraint on the isocurvature non-Gaussianity alpha^2 f_{NL}^{(ISO)}=40+-66 for the scale invariant isocurvature power spectrum, where alpha is the ratio of the power spectrum of isocurvature perturbations to that of the adiabatic ones. When we assume that the adiabatic perturbations can also be non-Gaussian, we obtain f_{NL}=38+-24 and alpha^2 f_{NL}^{(ISO)}=-8+-72. We also discuss implications our results for the axion CDM isocurvature model.
20 pages, 2 figures, 1 table; accepted for publication in JCAP
References in corpus (22)
- Detection of Gravitational Lensing in the Cosmic Microwave Background
- Optimal limits on f_{NL}^{local} from WMAP 5-year data
- Improved estimation of radiated axions from cosmological axionic strings
- Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
- Constraining Isocurvature Initial Conditions with WMAP 3-year data
- The curvature perturbation in a box
- Axion isocurvature fluctuations with extremely blue spectrum
- Correlated isocurvature perturbations from mixed inflaton-curvaton decay
- Isocurvature, non-gaussianity and the curvaton model
- Hints of Isocurvature Perturbations in the Cosmic Microwave Background?
- Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
- Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
- Non-Gaussianity from Baryon Asymmetry
- Cold Dark Matter Isocurvature Perturbations: Constraints and Model Selection
- General treatment of isocurvature perturbations and non-Gaussianities
- Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
- Cosmological Constraints on Isocurvature and Tensor Perturbations
- Constraints on scalar and tensor perturbations in phenomenological and two-field inflation models: Bayesian evidences for primordial isocurvature and tensor modes
- Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity
- Cold Dark Matter Isocurvature Perturbations: Cosmological Constraints and Applications
- Primordial Trispectrum from Isocurvature Fluctuations
- Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations
Cited by in corpus (28)
- Planck 2015 results. XVII. Constraints on primordial non-Gaussianity
- Axion dark matter from topological defects
- Axions : Theory and Cosmological Role
- The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
- Planck 2018 results. IX. Constraints on primordial non-Gaussianity
- Isocurvature Constraints and Anharmonic Effects on QCD Axion Dark Matter
- Resonant conversions of QCD axions into hidden axions and suppressed isocurvature perturbations
- Domain wall and isocurvature perturbation problems in axion models
- Level Crossing between QCD Axion and Axion-Like Particle
- Chaotic Inflation with Right-handed Sneutrinos after Planck
- Higgs inflation and suppression of axion isocurvature perturbation
- Optimal constraint on g_NL from CMB
- Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line
- Axion Models with High Scale Inflation
- Anomaly mediation deformed by axion
- Density Perturbations from Modulated Decay of the Curvaton
- Relaxing Isocurvature Bounds on String Axion Dark Matter
- Effective gravitational interactions of dark matter axions
- Elementary Theorems Regarding Blue Isocurvature Perturbations
- Fermionic Isocurvature Perturbations
- Large Blue Spectral Isocurvature Spectral Index Signals Time-Dependent Mass
- Spectator dark matter in non-standard cosmologies
- Isocurvature modes: joint analysis of the CMB power spectrum and bispectrum
- Axion-CMB Scenario in Supercooled Universe
- Smooth hybrid inflation in a supersymmetric axion model
- QCD Axions and CMB Anisotropy
- An Analytic Treatment of Underdamped Axionic Blue Isocurvature Perturbations
- Non-Gaussianity from explicit -breaking interactions