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Universe 2018, 4(7), 77; https://doi.org/10.3390/universe4070077

Primordial Gravitational Waves and Reheating in a New Class of Plateau-Like Inflationary Potentials

E. A. Milne Centre for Astrophysics, University of Hull, Cottingham Rd., Hull HU6 7RX, UK
Received: 24 May 2018 / Revised: 28 June 2018 / Accepted: 28 June 2018 / Published: 2 July 2018
(This article belongs to the Special Issue Gravitational Waves: Prospects after the First Direct Detections)
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Abstract

We study a new class of inflation model parametrized by the Hubble radius, such that aHexp(αφ)n. These potentials are plateau-like, and reduce to the power-law potentials in the simplest case n=2. We investigate the range of model parameters that is consistent with current observational constraints on the scalar spectral index and the tensor-to-scalar ratio. The amplitude of primordial gravitational waves in these models is shown to be accessible by future laser interferometers such as DECIGO. We also demonstrate how these observables are affected by the temperature and equation of state during reheating. We find that a large subset of this model can support instantaneous reheating, as well as very low reheating temperatures of order a few MeV, giving rise to interesting consequences for dark-matter production. View Full-Text
Keywords: cosmology; gravitational waves; inflation cosmology; gravitational waves; inflation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chongchitnan, S. Primordial Gravitational Waves and Reheating in a New Class of Plateau-Like Inflationary Potentials. Universe 2018, 4, 77.

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