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The wireless metaverse will create diverse user experiences at theintersection of the physical, digital, and virtual worlds. These experienceswill enable novel interactions between the constituents (e.g., extended reality(XR) users and avatars) of the three worlds. However, remarkably, to date,there is no holistic vision that identifies the full set of metaverse worlds,constituents, and experiences, and the implications of their associatedinteractions on next-generation communication and computing systems. In thispaper, we present a holistic vision of a limitless, wireless metaverse thatdistills the metaverse into an intersection of seven worlds and experiencesthat include the: i) physical, digital, and virtual worlds, along with the ii)cyber, extended, live, and parallel experiences. We then articulate how theseexperiences bring forth interactions between diverse metaverse constituents,namely, a) humans and avatars and b) connected intelligence systems and theirdigital twins (DTs). Then, we explore the wireless, computing, and artificialintelligence (AI) challenges that must be addressed to establishmetaverse-ready networks that support these experiences and interactions. Weparticularly highlight the need for end-to-end synchronization of DTs, and therole of human-level AI and reasoning abilities for cognitive avatars. Moreover,we articulate a sequel of open questions that should ignite the quest for thefuture metaverse. We conclude with a set of recommendations to deploy thelimitless metaverse over future wireless systems.

The Seven Worlds and Experiences of the Wireless Metaverse: Challenges and Opportunities