According to Transhumanist Terminology, this is akin to a Basement Universe, which, briefly, means it's an artificially created universe linked to another with a wormhole.

The uses for these are amazing, anything from controlling overpopulation, escape from a dying universe, hiding from your ex-wife, whatever.

The theory seems to have came from some thoughts w/r/t black holes.

Stephen Hawking had a book called Black Holes and Baby Universes.

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