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QED cascade saturation in extreme high fields.

Wen Luo1,2, Wei-Yuan Liu3,4, Tao Yuan4,5

  • 1School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China. wen.luo@usc.edu.cn.

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|June 1, 2018
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Summary
This summary is machine-generated.

Upcoming ultrahigh power lasers will enable experiments on electron-positron (e-e+) pair cascades and relativistic jets. These simulations show cascade saturation, leading to dense jets, potentially explaining astrophysical phenomena.

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Area of Science:

  • High-energy physics
  • Astrophysics
  • Plasma physics

Background:

  • Extreme astrophysical environments, like black holes and gamma-ray bursts, are associated with relativistic jets.
  • The formation, temperature, and composition of these jets remain long-standing questions in astrophysics.

Purpose of the Study:

  • To simulate electron-positron (e-e+) pair cascades and relativistic jet formation in controlled laboratory conditions.
  • To investigate the behavior of Quantum Electrodynamics (QED) strong-field interactions relevant to astrophysical phenomena.

Main Methods:

  • Simulations of pair cascades using two counter-propagating QED-strong laser fields.
  • Analysis of cascade growth scaling with laser intensity.

Main Results:

  • A scaling law for QED cascade growth was identified, with saturation observed above ~10^24 W/cm^2 laser intensity.
  • QED cascade saturation resulted in pair plasma cooling and longitudinal compression.
  • This process led to the formation of dense, relativistic e-e+ jets in transverse directions.

Conclusions:

  • Laser-driven QED cascade saturation provides a novel pathway to study energetic astrophysical phenomena in a laboratory setting.
  • The findings offer insights into the mechanisms behind relativistic jet formation in extreme cosmic environments.