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We discuss the properties of an ideal relativistic Bose gas with nonzero chemical potential (i. e. , with net charge) but differ from all previous discussions by including the effects of antiparticles. We obtain for the first time the relevant high-temperature expansion, emphasizing the constraint ||<~m, and show that a box of massless particles can have a net charge even though =0. Finally, we discuss the properties of Bose-Einstein condensation for both massless and massive bosons in d space dimensions.
Haber et al. (Mon,) studied this question.