Multiverse

The Multiverse postulates the existence of multiple universes parallel to our own. This pluraility of universes has been proposed by physicists to explain why the universe appears to be finely tuned for our existence.

Scientific American
Multiverse Theories Are Bad for Science - Scientific American (Archive) Nov 2019 John Horgan, Stevens Institute of Technology

New books by a physicist and science journalist mount aggressive but ultimately unpersuasive defenses of multiverses