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SUMMARY:Kinetic Simulations of Imbalanced Turbulence in a Relativistic Pla
 sma -  Amelia Hankla - University of Colorado Boulder
DTSTART:20211122T160000Z
DTEND:20211122T170000Z
UID:TALK162181@talks.cam.ac.uk
CONTACT:Dr Can Cui
DESCRIPTION:Turbulent high-energy astrophysical systems often feature asym
 metric energy injection: for instance\, Alfven waves propagating from an a
 ccretion disk into its corona. Such systems are "imbalanced": the energy f
 luxes parallel and anti-parallel to the large-scale magnetic field are une
 qual. In the past\, numerical studies of imbalanced turbulence have focuse
 d on the magnetohydrodynamic regime. In the present study\, we investigate
  externally-driven imbalanced turbulence in a collisionless\, ultrarelativ
 istically hot\, magnetized pair plasma using three-dimensional particle-in
 -cell (PIC) simulations. We find that the injected electromagnetic momentu
 m efficiently converts into plasma momentum\, resulting in net motion alon
 g the background magnetic field with speeds up to a significant fraction o
 f lightspeed. This discovery has important implications for the launching 
 of accretion disk winds. We also find that although particle acceleration 
 in imbalanced turbulence operates on a slower timescale than in balanced t
 urbulence\, it ultimately produces a power-law energy distribution similar
  to balanced turbulence. Our results have ramifications for black hole acc
 retion disk coronae\, winds\, and jets.
LOCATION:Online
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