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The dispersion properties of elliptically polarized electromagnetic (EM)waves in a magnetized electron-positron-pair (EP-pair) plasma are studied withthe effects of particle dispersion associated with the Bohm potential, theFermi degenerate pressure, and the exchange-correlation force. Two possiblemodes of the extraordinary or X wave, modified by these quantum effects, areidentified and their propagation characteristics are investigated numerically.It is shown that the upper-hybrid frequency, and the cutoff and resonancefrequencies are no longer constants but are dispersive due to these quantumeffects. It is found that the particle dispersion and the exchange-correlationforce can have different dominating roles on each other depending on whetherthe X waves are of short or long wavelengths (in comparison with the FermiDebye length). The present investigation should be useful for understanding thecollective behaviors of EP plasma oscillations and the propagation ofextraordinary waves in magnetized dense EP-pair plasmas.

Elliptically polarized electromagnetic waves in a magnetized quantum electron-positron plasma with effects of exchange-correlation