Implications of the curvaton on inflationary cosmology

2005/05/17 by Takeo Moroi, Tomo Takahashi · 66 citations
Mathematics · Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Inflationary epoch #Mathematics #Metric expansion of space #Observable #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Spectral density #Spectral index #Spectral line #Statistics #Theoretical physics #astro-ph #hep-ph

paper · pdf · doi:10.1103/physrevd.72.023505

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 72(2) (American Physical Society) · 21 pages, 9 figures

arxiv created 2005/05/17 · openalex publication_date 2005/07/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study implications of the curvaton, a late-decaying light scalar field, on inflationary cosmology, paying particular attentions to modifications of observable quantities such as the scalar spectral index of the primordial power spectrum and the tensor-to-scalar ratio. We consider this issue from a general viewpoint and discuss how the observable quantities are affected by the existence of the curvaton. It is shown that the modification owing to the curvaton depends on class of inflation models. We also study the effects of the curvaton on inflation models generated by the inflationary flow equation.

Citations

• Minimal supersymmetric standard model flat direction as a curvaton
• Probing String Theory with Modulated Cosmological Fluctuations
• The Peccei-Quinn field as curvaton
• Generating the curvature perturbation without an inflaton
• Observational constraints on the inflaton potential combined with flow equations in inflaton space
• Resonant decay of flat directions
• A more accurate analytic calculation of the spectrum of cosmological perturbations produced during inflation
• Mixed inflaton and curvaton perturbations
• Reconstructing large running index inflaton potentials
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Preliminary Maps and Basic Results
• Curvaton scenario with low scale inflation revisited
• Inflationary physics from the Wilkinson Microwave Anisotropy Probe
• How long before the end of inflation were observable perturbations produced?

Cited by

• Inflation with an extra light scalar field after Planck
• Non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario
• CMB spectral distortions in generic two-field models
• On classification of models of large local-type non-Gaussianity
• Primordial black holes from a curvaton: the role of bimodal distributions