Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models

Abstract

We study non-Gaussianity, the spectral index of primordial scalar fluctuations and tensor modes in models where fluctuations from the inflaton and the curvaton can both contribute to the present cosmic density fluctuations. Even though simple single-field inflation models generate only tiny non-Gaussianity, if we consider such a mixed scenario, large non-Gaussianity can be produced. Furthermore, we study the inflationary parameters such as the spectral index and the tensor-to-scalar ratio in this kind of models and discuss in what cases models predict the spectral index and tensor modes allowed by the current data while generating large non-Gaussianity, which may have many implications for model-buildings of the inflationary universe.

40 pages, 16 figures, discussions added, references added

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• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• Primordial Non-Gaussianities of General Multiple Field Inflation
• On Classification of Models of Large Local-Type Non-Gaussianity
• Anisotropic non-Gaussianity from vector field perturbations
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• The Void Abundance with Non-Gaussian Primordial Perturbations
• The Odd-Parity CMB Bispectrum
• On the full quantum trispectrum in multi-field DBI inflation
• Lorentz boost and non-Gaussianity in multi-field DBI-inflation
• Probing the scale dependence of non-Gaussianity with spectral distortions of the cosmic microwave background
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• Scale-dependence of Non-Gaussianity in the Curvaton Model
• Hilltop Non-Gaussianity
• Primordial perturbations and non-Gaussianities from modulated trapping
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• Higgs boson induced reheating and ultraviolet frozen-in dark matter
• Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
• The Trispectrum in the Multi-brid Inflation
• Implications of time-dependent inflaton decay on reheating and dark matter production
• N-vaton
• Runnings in the Curvaton
• Negative spectral index of $f_{NL}$ in the axion-type curvaton model
• Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
• Consistency Relations for Non-Gaussianity
• Shortcomings of New Parametrizations of Inflation
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• The CMB Bispectrum, Trispectrum, non-Gaussianity, and the Cramer-Rao Bound
• Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
• Slow-Roll Inflation at N3LO
• Non-Gaussianity and Gravitational Waves from Quadratic and Self-interacting Curvaton
• ${\varphi }^4$ inflation is not excluded
• Curvaton in large field inflation
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• Spectral Index in Curvaton Scenario
• Optimizing future experimental probes of inflation
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• Primordial Trispectrum from Isocurvature Fluctuations
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• CMB spectral distortions in generic two-field models
• Multi-chaotic inflation with and without spectator field
• Double inflation via non-minimally coupled spectator
• Thermal Effects and Sudden Decay Approximation in the Curvaton Scenario
• Reheating in Chaotic D-Term Inflation
• Refined Study of Isocurvature Fluctuations in the Curvaton Scenario
• Affleck-Dine baryogenesis with modulated reheating
• Non-Gaussianity in String Cosmology: A Case Study
• Clocking the End of Cosmic Inflation
• Manifestly gauge invariant theory of the nonlinear cosmological perturbations in the leading order of the gradient expansion
• Curvaton and quantum gravity effect on the tensor to scalar ratio of the chaotic inflation
• Sneutrinos as two inflatons and curvaton and leptogenesis
• Viable Curvaton Models from the $f_{NL}$ Parameter