Gravitational waves from a curvaton model with blue spectrum

Abstract

We investigate the gravitational wave background induced by the first order scalar perturbations in the curvaton models. We consider the quadratic and axion-like curvaton potential which can generate the blue-tilted power spectrum of curvature perturbations on small scales and derive the maximal amount of gravitational wave background today. We find the power spectrum of the induced gravitational wave background has a characteristic peak at the frequency corresponding to the scale reentering the horizon at the curvaton decay, in the case where the curvaton does not dominate the energy density of the Universe. We also find the enhancement of the amount of the gravitational waves in the case where the curvaton dominates the energy density of the Universe. Such induced gravitational waves would be detectable by the future space-based gravitational wave detectors or pulsar timing observations.

24 pages, 7 figures, version accepted for publication in JCAP

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• NANOGrav results and LIGO-Virgo primordial black holes in axion-like curvaton model
• Formation of primordial black holes in an axionlike curvaton model
• Primordial black holes in the curvaton model: possible connections to pulsar timing arrays and dark matter
• Gravitational Waves and Scalar Perturbations from Spectator Fields
• Induced gravitational waves from the cosmic coincidence
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• Constraints on primordial black holes from LIGO-Virgo-KAGRA O3 events
• Gravitational waves from type II axion-like curvaton model and its implication for NANOGrav result
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• Scalar induced gravitational waves review
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• Gravitational waves in a cyclic Universe: resilience through cycles and vacuum state
• Bispectrum of induced gravitational waves in the poltergeist mechanism
• Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe