The Multiverse Theory: Exploring the Possibility of Multiple Universes.

Physicists are exploring the possibility of a multiverse, containing domains with different physical laws and values of fundamental constants, which could explain why our universe is life-friendly. The theory of inflation suggests that there could be an “eternal” production of Big Bangs, each giving rise to a new universe. String theory suggests that there are more dimensions than the ones we experience, and each type of compactification could create a universe with different microphysics. The “laws of nature” may therefore be local by-laws governing our own cosmic patch. Critics argue that the multiverse is unscientific because we can’t observe other universes, but physicists believe that we might one day have reasons to believe that they exist.