Can Gravitational Waves Halt the Expansion of the Universe?
Abstract
:1. Introduction
2. Review of Plane Gravitational Waves with
3. The Equations
3.1. General Setup
3.2. De-Sitter Space–Time
4. Numerical Setup
5. A Single Wave
5.1. An Analytical View
5.2. Numerical Analysis
5.3. Critical Behaviour
5.4. An Impulsive Wave
6. Two Waves
6.1. Comparison against
6.2. Critical Behaviour
- 1
- : Asymptote back to dS.
- 2
- : but .
- 3
- : and .
- Case 1: The gravitational contraction is not strong enough to cause the timelike geodesics to converge or the curvature to diverge.
- Case 2: The gravitational contraction is strong enough to cause the timelike geodesics to converge and create a coordinate singularity. However, it is not strong enough to cause the curvature to diverge and this goes back to zero.
- Case 3: The gravitational contraction is strong enough to cause both the timelike geodesics to converge and the curvature to diverge, resulting in a physical curvature singularity.
6.3. Impulsive Waves
7. Suppressing the Expansion with a Train of Waves
8. Summary and Discussion
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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1 | N is a lapse and should always be positive. |
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Frauendiener, J.; Hakata, J.; Stevens, C. Can Gravitational Waves Halt the Expansion of the Universe? Universe 2021, 7, 228. https://doi.org/10.3390/universe7070228
Frauendiener J, Hakata J, Stevens C. Can Gravitational Waves Halt the Expansion of the Universe? Universe. 2021; 7(7):228. https://doi.org/10.3390/universe7070228
Chicago/Turabian StyleFrauendiener, Jörg, Jonathan Hakata, and Chris Stevens. 2021. "Can Gravitational Waves Halt the Expansion of the Universe?" Universe 7, no. 7: 228. https://doi.org/10.3390/universe7070228