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Numerical investigation of kinetic turbulence in relativistic pair plasmas I: Turbulence statistics | | Vladimir Zhdankin
; Dmitri A. Uzdensky
; Gregory R. Werner
; Mitchell C. Begelman
; | | Date: |
14 Sep 2017 | | Abstract: | 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
$1024^3$ cells and containing up to $2 imes 10^{11}$ 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, log-normal 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. | | Source: | arXiv, 1709.4963 | | Services: | Forum | Review | PDF | Favorites | |
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