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Gravitational wave turbulence
Turbulence is a universal phenomenon observed from the quantum scale to the astrophysical scale. At LPP, turbulence is a transverse research axis concerning laboratory plasmas (tokamaks) and space plasmas (solar wind, planetary magnetospheres).
- Fluctuations of two components of the space-time metric.
Today, direct numerical simulations reveal that it is possible to produce turbulence in general relativity. Using tools borrowed from plasma physics, the authors have highlighted classical properties of wave turbulence (here gravitational waves) with a direct cascade of energy and an inverse cascade of wave action. This study demonstrates that in the extreme conditions that we could experience in the very primordial Universe - the first second - space-time can, like a plasma, present erratic fluctuations with transfers from scale to scale. This discovery about a sea of gravitational waves provides fundamental information that could lead to a better understanding of the post-Big Bang Universe and its tremendous - and still mysterious - expansion called cosmological inflation.
Contact at LPP : Sébastien Galtier
INSIS news: Mieux comprendre l’expansion de l’Univers grâce à la turbulence des ondes gravitationnelles
View online : Galtier & Nazarenko, Phys. Rev. Lett. 127, 131101 (2021) – Editors’ suggestion
Also in this section :
- Solar Orbiter at Venus: first in-situ measurements of the “LFR”/RPW instrument
- Electric Field-Induced Second Harmonic (E-FISH) Generation: Towards a robust method for electric field measurements in plasmas
- Gautier Nguyen defended his PhD thesis "Study of the coupling between magnetosphere and solar wind with machine learning"
- PLASMAScience combines the strengths of 7 IP Paris laboratories
- Launch of the PLAS@PAR Federation website
- Clément Moissard defended his PhD thesis "Interplanetary sheaths driven by magnetic clouds and their impact on Earth’s magnetosheath"
- Nadjirou Ba and David Pai join LPP
- Audrey Chatain has been awarded the 2021 PhD Research Award of the European Physical Society
- Sustainable improvement of seeds vigor using dry atmospheric plasma priming
- Dr Nadira Frescaline defended her accreditation to supervise research on “Microbial invasion of the skin: new diagnostic modalities and treatment approaches”
- A new book on turbulence by Sébastien Galtier
- Direct measurement of two-photon absorption in xenon and its impact on TALIF-measured atomic oxygen densities
- Chenyang Ding defended his PhD thesis on "Experimental study of plasma parameters in nanosecond surface dielectric barrier filamentary discharge".
- Creation of a climate group at LPP
- Hanen Oueslati defended her PhD "Modeling and numerical simulation of tokamak plasmas : axisymmetric steady states with finite flows"
- A new 2D cascade model for plasma and atmospheric turbulence
- Contribution of LPP to a large review paper on CO2 plasmas
- Renaud Ferrand defended his PhD "Multi-scale compressible turbulence in astrophysical plasmas viewed through theoretical, numerical and observational methods"
- Multi-spacecraft coordinated observations during BepiColombo’s cruise phase
- LPP participates in the "Fête de la Science 2021"
