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A Plausible Model of Inflation Driven by Strong Gravitational Wave Turbulence

1
Laboratoire de Physique des Plasmas, École polytechnique, Université Paris-Saclay, Institut Universitaire de France, CEDEX, F-91128 Palaiseau, France
2
Mathematics Group, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
3
Institut de Physique de Nice, Université Nice-Sophia Antipolis, Parc Valrose, 06108 Nice, France
*
Author to whom correspondence should be addressed.
Universe 2020, 6(7), 98; https://doi.org/10.3390/universe6070098
Received: 10 June 2020 / Revised: 8 July 2020 / Accepted: 14 July 2020 / Published: 16 July 2020
(This article belongs to the Section Cosmology)
It is widely accepted that the primordial universe experienced a brief period of accelerated expansion called inflation. This scenario provides a plausible solution to the horizon and flatness problems. However, the particle physics mechanism responsible for inflation remains speculative with, in particular, the assumption of a scalar field called inflaton. Furthermore, the comparison with the most recent data raises new questions that encourage the consideration of alternative hypotheses. Here, we propose a completely different scenario based on a mechanism whose origins lie in the nonlinearities of the Einstein field equations. We use the analytical results of weak gravitational wave turbulence to develop a phenomenological theory of strong gravitational wave turbulence where the inverse cascade of wave action plays a key role. In this scenario, the space-time metric excitation triggers an explosive inverse cascade followed by the formation of a condensate in Fourier space whose growth is interpreted as an expansion of the universe. Contrary to the idea that gravitation can only produce a decelerating expansion, our study reveals that strong gravitational wave turbulence could be a source of inflation. The fossil spectrum that emerges from this scenario is shown to be in agreement with the cosmic microwave background radiation measured by the Planck mission. Direct numerical simulations can be used to check our predictions and to investigate the question of non-Gaussianity through the measure of intermittency. View Full-Text
Keywords: general relativity; gravitational waves; turbulence general relativity; gravitational waves; turbulence
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MDPI and ACS Style

Galtier, S.; Laurie, J.; Nazarenko, S.V. A Plausible Model of Inflation Driven by Strong Gravitational Wave Turbulence. Universe 2020, 6, 98. https://doi.org/10.3390/universe6070098

AMA Style

Galtier S, Laurie J, Nazarenko SV. A Plausible Model of Inflation Driven by Strong Gravitational Wave Turbulence. Universe. 2020; 6(7):98. https://doi.org/10.3390/universe6070098

Chicago/Turabian Style

Galtier, Sébastien; Laurie, Jason; Nazarenko, Sergey V. 2020. "A Plausible Model of Inflation Driven by Strong Gravitational Wave Turbulence" Universe 6, no. 7: 98. https://doi.org/10.3390/universe6070098

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