Strong EM waves in pair plasmas are governed by nonlinearity parameter ε_p, producing attenuation over ε_p^{-2/3} wavelengths when small and shock formation when large.
Complete reflection of nonlinear electromagnetic waves in underdense pair plasmas enabled by dynamically formed Bragg-like structures
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abstract
In contrast to relativistically induced transparency in electron--ion plasmas, where nonlinear electromagnetic waves render initially opaque plasmas transparent, we show using kinetic simulations that such waves can instead make initially transparent pair plasmas fully reflective. The difference is mass symmetry, which eliminates charge-separation electric fields. As the wave compresses the pair plasma, weak reflection seeds density spikes that form a moving Bragg-like grating. Enhanced reflection enables a transition to a regime where the plasma--vacuum interface sustains complete reflection.
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Nonlinear Alfven waves with k near k0 in highly magnetized pair plasmas experience strong modulational instability that drives density fluctuations and generates high-frequency modes.
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Interaction of Strong Electromagnetic Waves with Unmagnetized Pair Plasmas
Strong EM waves in pair plasmas are governed by nonlinearity parameter ε_p, producing attenuation over ε_p^{-2/3} wavelengths when small and shock formation when large.
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Powerful parametric instability of Alfven waves in astrophysical pair plasma
Nonlinear Alfven waves with k near k0 in highly magnetized pair plasmas experience strong modulational instability that drives density fluctuations and generates high-frequency modes.