Wave dispersion in highly relativistic plasma

Dispersion in a highly relativistic plasma is described by a relativistic p lasma dispersion function that becomes increasingly sharply peaked as the p lasma becomes increasingly relativistic. Wave dispersion in a highly relati vistic plasma is discussed in three contexts: low frequency waves in a puls ar plasma (a one-dimensional, extremely strongly magnetized, pair plasma), Langmuir waves in an isotropic thermal plasma, and high-frequency waves in a synchrotron emitting gas.