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We discuss the essential features of baby-universe production, starting froma description of black holes and wormholes, in terms of the causal structure ofspacetime, and following a qualitative review of the connection between vacuumdecay and inflation in early universe cosmology. Related open questions arealso addressed, especially in connection with the possibility that babyuniverses could be formed within our present universe - either in a futureparticle accelerator, or spontaneously.

From Black Holes to Baby Universes: Exploring the Possibility of Creating a Cosmos in the Laboratory