"Another aspect of the realist approach, which some physicists find implausible, is that it seems to lead inevitably to the “many-worlds interpretation” of quantum mechanics, presented originally in the 1957 Princeton Ph.D. thesis of Hugh Everett (1930–1982). In this approach, the state vector does not collapse; it continues to be governed by the deterministic time-dependent Schrödinger equation, but different components of the state vector of the system studied become associated with different components of the state vector of the measuring apparatus and observer, so that the history of the world effectively splits into different paths, each characterized by different results of the measurement."
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Steven Weinberg, Lectures on Quantum Mechanics (2nd ed. 2015), Chap. 3 : General Principles of Quantum Mechanics
https://en.wikiquote.org/wiki/Many-worlds_interpretation
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Many-worlds interpretation
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