Large relativistic density pulses in electron-positron-ion plasmas

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Abstract
The nonlinear propagation of circularly polarized electromagnetic waves with relativistically strong amplitudes in an unmagnetized hot electron-positron plasma with a small fraction of ions is investigated. The possibility of finding localized solutions in such a plasma is explored. It is shown that these plasmas support the propagation of ‘‘heavy bullets of light’’: nondiffracting and nondispersive electromagnetic pulses with large density bunching.