期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 474, 期 2, 页码 2514-2535出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2883
关键词
plasmas; turbulence; MHD
资金
- NSF [AST-1411879]
- NASA ATP grants [NNX16AB28G, NNX17AK57G]
- Ambrose Monell Foundation
- DOE Office of Science User Facility [DE-AC02-06CH11357]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1411879] Funding Source: National Science Foundation
- NASA [907828, NNX16AB28G] Funding Source: Federal RePORTER
We describe results from particle-in-cell simulations of driven turbulence in collisionless, magnetized, relativistic pair plasma. This physical regime provides a simple setting for investigating the basic properties of kinetic turbulence and is relevant for high-energy astrophysical systems such as pulsar wind nebulae and astrophysical jets. In this paper, we investigate the statistics of turbulent fluctuations in simulations on lattices of up to 10243 cells and containing up to 2 x 10(11) particles. Due to the absence of a cooling mechanism in our simulations, turbulent energy dissipation reduces the magnetization parameter to order unity within a few dynamical times, causing turbulent motions to become sub-relativistic. In the developed stage, our results agree with predictions from magnetohydrodynamic turbulence phenomenology at inertial-range scales, including a power-law magnetic energy spectrum with index near -5/3, scale-dependent anisotropy of fluctuations described by critical balance, lognormal distributions for particle density and internal energy density (related by a 4/3 adiabatic index, as predicted for an ultra-relativistic ideal gas), and the presence of intermittency. We also present possible signatures of a kinetic cascade by measuring power-law spectra for the magnetic, electric and density fluctuations at sub-Larmor scales.
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