Non-Gaussianity and gravitational waves from a quadratic and self-interacting curvaton

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.064025· OSTI ID:21537545

Fonseca, Jose; Wands, David ^[1]

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1. Institute of Cosmology and Gravitation, Dennis Sciama Building, Burnaby Road, University of Portsmouth, Portsmouth, PO1 3FX (United Kingdom) and Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502 (Japan)

In this paper we consider how non-Gaussianity of the primordial density perturbation and the amplitude of gravitational waves from inflation can be used to determine parameters of the curvaton scenario for the origin of structure. We show that in the simplest quadratic model, where the curvaton evolves as a free scalar field, measurement of the bispectrum relative to the power spectrum, f{sub NL}, and the tensor-to-scalar ratio can determine both the expectation value of the curvaton field during inflation and its dimensionless decay rate relative to the curvaton mass. We show how these predictions are altered by the introduction of self-interactions, in models where higher-order corrections are determined by a characteristic mass scale and discuss how additional information about primordial non-Gaussianity and scale dependence may constrain curvaton interactions.

• OSTI ID: 21537545
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
CORRECTIONS
DECAY
DENSITY
DISTURBANCES
FORECASTING
GRAVITATIONAL WAVES
INTERACTIONS
MASS
PERTURBATION THEORY
PHYSICAL PROPERTIES
SCALAR FIELDS
SPECTRA