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Kinetic turbulence in relativistic plasma: from thermal bath to non-thermal continuum | | Vladimir Zhdankin
; Gregory R. Werner
; Dmitri A. Uzdensky
; Mitchell C. Begelman
; | | Date: |
15 Sep 2016 | | Abstract: | We present results from particle-in-cell simulations of driven turbulence in
collisionless, relativistic pair plasma. We find that turbulent fluctuations
are consistent with the classical $k_perp^{-5/3}$ magnetic energy spectrum at
fluid scales and a steeper $k_perp^{-4}$ spectrum at sub-Larmor scales, where
$k_perp$ is the wavevector perpendicular to the mean field. We demonstrate the
development of a non-thermal, power-law particle energy distribution, $f(E)
sim E^{-alpha}$, with index well fit by $alpha sim 1 + C_0 (sigma
ho_e/L)^{-1/2}$, where $C_0$ is a constant, $sigma$ is magnetization, and
$
ho_e/L$ is the ratio of characteristic Larmor radius to system size. In the
absence of asymptotic system-size independent scalings, our results challenge
the viability of turbulent particle acceleration in high-energy astrophysical
systems such as pulsar wind nebulae. | | Source: | arXiv, 1609.4851 | | Services: | Forum | Review | PDF | Favorites | |
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