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Two kinds of topological excitations, skyrmions and monopoles, are studied.It is revealed that these two types of excitations originate from differentorder parameter fields that reflect different spatial distributions of the Neelvector. Critical phenomena of the generation and annihilation ofskyrmion-antiskyrmion pairs are also discussed.Comment: 9 page

Topological Excitation in an Antiferromagnetic Bose-Einstein Condensate