Electromagnetic ghosts in pair plasmas
Abstract
Collisions of two weakly nonlinear, a0 1, counter-propagating EM pulses in pair plasma leave behind a long-surviving collection of localized waves, an electromagnetic ghost. Waves are trapped (localized) by the random large density fluctuations created by the beat between the pulses. The process is similar to random plasma density grating and/or Anderson-like wave localization. Structures survive for long, mesoscale times, while the EM energy slowly bleeds through high density walls of the density trap. Large guide magnetic field, ωB ≥ few ω, suppresses the formation of the ghosts.
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