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- W2510182766 abstract "We present results from the first 3D kinetic numerical simulation of magnetorotational turbulence and dynamo, using the local shearing-box model of a collisionless accretion disc. The kinetic magnetorotational instability grows from a subthermal magnetic field having zero net flux over the computational domain to generate self-sustained turbulence and outward angular-momentum transport. Significant Maxwell and Reynolds stresses are accompanied by comparable viscous stresses produced by field-aligned ion pressure anisotropy, which is regulated primarily by the mirror and ion-cyclotron instabilities through particle trapping and pitch-angle scattering. The latter endow the plasma with an effective viscosity that is biased with respect to the magnetic-field direction and spatio-temporally variable. Energy spectra suggest an Alfv'en-wave cascade at large scales and a kinetic-Alfv'en-wave cascade at small scales, with strong small-scale density fluctuations and weak non-axisymmetric density waves. Ions undergo non-thermal particle acceleration, their distribution accurately described by a kappa distribution. These results have implications for the properties of low-collisionality accretion flows, such as that near the black hole at the Galactic center." @default.
- W2510182766 created "2016-09-16" @default.
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- W2510182766 date "2016-12-01" @default.
- W2510182766 modified "2023-10-13" @default.
- W2510182766 title "Magnetorotational Turbulence and Dynamo in a Collisionless Plasma" @default.
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- W2510182766 doi "https://doi.org/10.1103/physrevlett.117.235101" @default.
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