Localized solutions for circularly polarized electromagnetic waves in electron-positron plasmas

Abstract
Two possible localized solutions are found for large amplitude, circularly polarized, electromagnetic waves in electron-positron plasmas. Depending on the 'longitudinal' motion of the charges, a soliton (field amplitude) can propagate in a constant density plasma or a spatially localized vacuum cavity is formed and particles can be accelerated to very high velocities.