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Particle Acceleration in Relativistic Plasma Turbulence.

Luca Comisso1, Lorenzo Sironi1

  • 1Department of Astronomy and Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA.

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Relativistic turbulence in pair plasmas generates nonthermal particles with a power-law energy spectrum. Particle acceleration occurs at current sheets and through turbulent interactions, with spectrum properties depending on magnetization and turbulence levels.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • High-Energy Emission

Background:

  • Turbulence is frequently proposed as the source of nonthermal particles in high-energy astrophysical phenomena.
  • Understanding particle acceleration mechanisms is crucial for explaining observed cosmic emissions.

Purpose of the Study:

  • To investigate the role of decaying turbulence in relativistic pair plasmas.
  • To determine how turbulence influences particle energy spectra and acceleration.

Main Methods:

  • Utilized particle-in-cell simulations to model decaying turbulence in magnetically dominated pair plasmas.
  • Tracked a large sample of particles to analyze their injection and acceleration processes.

Main Results:

  • Confirmed that relativistic turbulence generically produces power-law particle energy spectra.
  • Observed that harder power-law slopes correlate with higher magnetization and stronger turbulence.
  • Found that spectral cutoff scales linearly with system size, independent of dimensionality.

Conclusions:

  • Relativistic turbulence is a key mechanism for generating nonthermal particles in astrophysical sources.
  • Particle injection occurs at reconnecting current sheets, followed by stochastic acceleration.
  • The properties of the resulting particle spectra are sensitive to plasma and turbulence parameters.