Sean Carroll’s New Book Argues For A Multiplicity Of Universes
Physicist Sean Carroll, in his new book Something Deeply Hidden, embraces one of the most controversial interpretations of quantum physics, the Many-Worlds Interpretation, according to ScienceNews.
Quantum physics’ equations describe multiple possible outcomes for a measurement at the subatomic level, a statement that has drawn nearly two dozen interpretations of what it really means.
Carroll argues that multiple possible measurement outcomes suggests multiple existing universes.
For example, when measuring the spin of an electron, the spin axis can either point up or down. According to the Many-Worlds Interpretation, when the measurement is made, the universe splits into two copies, one where the spin axis is up, the other where the spin axis is down.
“The theory describes many copies of what we think of as ‘the universe,’” Carroll writes, “each slightly different, but each truly real in some sense.” But if you want to know where each of these copies are, he says, “There is no ‘place’ where those branches are hiding; they simply exist simultaneously, along with our own, effectively out of contact with it.”
This interpretation, which originated in the 1950s by American physicist Hugh Everett III, criticizes the standard approach and questions the unseen mechanisms that could be responsible for the results of the experiment.
While Carroll crafts his quantum book to address the Many-Worlds Interpretation, minor shortcomings exist as his case is not conclusive, and only abstract.