A covariant and gauge-invariant theorY is used to describe dispersion in an isotropic plasma in terms of two invariant functions. These invariants are evaluated explicitly for a relativistic Maxwellian (Jtittner-Synge) distribution. The relations between forms for the dispersion of a relativistic Maxwellian distribution obtained by some earlier authors and the forms obtained here are demonstrated.
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DB Melrose (1982) studied this question.
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