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Particle dynamics governed by radiation losses in extreme-field current sheets.

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Radiation reaction forces significantly impact particle motion in extreme environments like pulsars. These forces can even cause particle pinching within current sheets, a key finding for astrophysics and laser physics.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • High-Energy Particle Physics

Background:

  • Particles in extreme environments (pulsars, high-power lasers) experience significant radiation losses.
  • Understanding particle dynamics in relativistic current sheets is crucial for astrophysical phenomena and laboratory experiments.

Purpose of the Study:

  • To analyze particle motion in relativistic neutral electron-positron current sheets, accounting for radiative effects.
  • To derive analytical solutions for particle trajectories under radiation reaction, considering both quantum and semiclassical regimes.

Main Methods:

  • Analytical solution derived using the Landau-Lifshitz radiation reaction force model for negligible quantum effects.
  • Averaged quantum solution obtained via a semiclassical approach for significant quantum effects.
  • Comparison of analytical solutions with numerical simulations that include radiative effects.

Main Results:

  • Analytical solutions for particle trajectories show good agreement with numerical simulations.
  • The applicability regions for the derived solutions were determined.
  • Radiation reaction is identified as a mechanism capable of particle pinching within current sheets.

Conclusions:

  • The study provides accurate analytical models for particle dynamics in extreme electromagnetic fields with radiation.
  • Radiation reaction is a fundamental process that can lead to particle self-organization (pinching) in plasmas.
  • Findings are relevant for understanding particle acceleration in astrophysical objects and in advanced laser-plasma experiments.