Electromagnetic Solitons in Degenerate Relativistic Electron-Positron   Plasma
  The existence of soliton-like electromagnetic (EM) distributions in a fully degenerate electron-positron plasma is studied applying relativistic hydrodynamic and Maxwell equations. For circularly polarized wave it is found that the soliton solutions exist both in relativistic as well as nonrelativistic degenerate plasmas. Plasma density in the region of soliton pulse localization is reduced considerably. The possibility of plasma cavitation is also shown. 
V.I. Berezhiani, N.L. Shatashvili and N.L. Tsintsadze
physics.plasm-ph