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Books > Science & Mathematics > Physics > Quantum physics (quantum mechanics)
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Many Worlds? - Everett, Quantum Theory, & Reality (Paperback)
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Many Worlds? - Everett, Quantum Theory, & Reality (Paperback)
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What does realism about the quantum state imply? What follows when
quantum theory is applied without restriction, if need be, to the
whole universe? These are the questions which an illustrious team
of philosophers and physicists debate in this volume. All the
contributors are agreed on realism, and on the need, or the
aspiration, for a theory that unites micro- and macroworlds, at
least in principle. But the further claim argued by some is that if
you allow the Schrodinger equation unrestricted application,
supposing the quantum state to be something physically real, then
this universe is one of countlessly many others, constantly
branching in time, all of which are real. The result is the many
worlds theory, also known as the Everett interpretation of quantum
mechanics.
The contrary claim sees this picture of many worlds as in no sense
inherent in quantum mechanics, even when the latter is allowed
unrestricted scope and even given that the quantum state itself is
something physically real. For this picture of branching worlds
fails to make physical sense, let alone common sense, even on its
own terms. The status of these worlds, what they are made of, is
never adequately explained. Ordinary ideas about time and identity
over time become hopelessly compromised. The concept of probability
itself is brought into question. This picture of many branching
worlds is inchoate, it is a vision, an error. There are realist
alternatives to many worlds, some even that preserve the
Schrodinger equation unchanged.
Twenty specially written essays, accompanied by commentaries and
discussions, examine these claims and counterclaims in depth. They
focus first on the question of ontology, the existence of worlds
(Part 1 and 2), second on the interpretation of probability (Parts
3 and 4), and third on alternatives or additions to many worlds
(Parts 5 and 6). The introduction offers a helpful guide to the
arguments for the Everett interpretation, particularly as they have
been formulated in the last two decades.
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