تقرير
A plausible model of inflation driven by strong gravitational wave turbulence
| العنوان: | A plausible model of inflation driven by strong gravitational wave turbulence |
|---|---|
| المؤلفون: | Galtier, Sebastien, Laurie, Jason, Nazarenko, Sergey V. |
| المصدر: | Universe, 6(7), 98, (2020) |
| سنة النشر: | 2019 |
| المجموعة: | General Relativity and Quantum Cosmology |
| مصطلحات موضوعية: | General Relativity and Quantum Cosmology |
| الوصف: | 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 nonlin-earities 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 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. Comment: 13 pages, 1 figure |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3390/universe6070098 |
| URL الوصول: | http://arxiv.org/abs/1910.07634 |
| رقم الأكسشن: | edsarx.1910.07634 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3390/universe6070098 |
|---|