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How could a baby universe bud off from a parent universe?

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Discover the difference between the observable universe and the whole universe — Multiverse Learn about the distinction between the observable universe and the whole universe.

In the context of cosmology, the concept of a "baby universe" refers to a theoretical process in which a new region of space-time is created that buds off and potentially disconnects from its parent universe.1

This process is hypothesized to occur through quantum gravitational mechanisms, which would bridge general relativity and quantum mechanics to explain the creation of self-contained space-time. Some scientists have speculated that this budding could take place within the interiors of black holes. Because the intense gravitational environment of a black hole distorts the space-time continuum, it is theoretically proposed that such a region could evolve into a new, separate universe, leading to a "tree" of universes that are unlikely to interact after their formation.12

While this remains a speculative area of study due to the inaccessibility of black hole interiors, it represents a significant attempt to understand the origins of space-time beyond our own observable universe.12