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Sean carroll many worlds book6/1/2023 ![]() There’s no need to update or ‘collapse’ the wave function once a measurement has been made–but the catch is you have to accept that there is a separate reality for every possible path or probability right out of the wave function itself, many worlds indeed.įor different reasons Hossenfelder and physicists like Steve Barr at University of Delaware find this problematic. Many Worlds is attractive to Carroll and others because it helps restore a view of objective reality as entirely observer independent. Whether the benefit is worth the cost is an issue about which people disagree. The price we pay for this vastly increased elegance of theoretical formalism, Carroll writes, “is that the theory describes many copies of what we think of as ‘the universe,’ each slightly different, but each truly real in some sense. This universe splitting is also sometimes called branching.” Instead, many worlds people say, every time you make a measurement, the universe splits into several parallel worlds, one for each possible measurement outcome. ![]() ![]() ![]() As Hossenfelder puts it, Everett’s breakthrough was to suggest doing away with the problem of the quantum measurement “by just saying there isn’t such a thing as wavefunction collapse. ![]()
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