Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
arXiv:0810.0189 · doi:10.1016/j.physletb.2008.12.034
Abstract
We discuss non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario, assuming that the baryon asymmetry of the universe originates only from the decay products of the inflaton. When large non-Gaussianity is realized in such a scenario, non-vanishing baryonic isocurvature fluctuations can also be generated unless the baryogenesis occurs after the decay of the curvaton. We calculate the non-linearity parameter f_NL and the baryonic isocurvature fluctuations, taking account of the primordial fluctuations of both the inflaton and the curvaton. We show that, although current constraints on isocurvature fluctuations are severe, the non-linearity parameter can be large as f_NL \sim O(10-100) without conflicting with the constraints.
14 pages, 3 figures, published version
References in corpus (15)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
- Big-Bang Nucleosynthesis and Gravitino
- Non-Gaussianity in the modulated reheating scenario
- Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating
- Probing String Theory with Modulated Cosmological Fluctuations
- Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
- A numerical study of non-gaussianity in the curvaton scenario
- Constraining Isocurvature Initial Conditions with WMAP 3-year data
- Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
- Large Non-Gaussianity Implication for Curvaton Scenario
- Non-Gaussianity from Baryon Asymmetry
- N-vaton
- Spectral Index in Curvaton Scenario
- Right-handed neutrinos as the source of density perturbations
Cited by in corpus (17)
- A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
- On Classification of Models of Large Local-Type Non-Gaussianity
- Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
- Scale-dependence of Non-Gaussianity in the Curvaton Model
- The Trispectrum in the Multi-brid Inflation
- Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
- Negative spectral index of in the axion-type curvaton model
- Curvaton with Nonminimal Derivative Coupling to Gravity II: Full Perturbation Analysis
- Optimizing future experimental probes of inflation
- Primordial Trispectrum from Isocurvature Fluctuations
- Compensation for large tensor modes with iso-curvature perturbations in CMB anisotropies
- Non-Gaussianity in three fluid curvaton model
- Isocurvature perturbations and tensor mode in light of Planck and BICEP2
- Non-Gaussianity from Attractor Curvaton
- Curvatons in Warped Throats
- Affleck-Dine baryogenesis with modulated reheating
- Refined Study of Isocurvature Fluctuations in the Curvaton Scenario