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Books > Science & Mathematics > Physics > Quantum physics (quantum mechanics)
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Many Worlds? - Everett, Quantum Theory, & Reality (Hardcover)
Loot Price: R3,354
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Many Worlds? - Everett, Quantum Theory, & Reality (Hardcover)
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What would it mean to apply quantum theory, without restriction and
without involving any notion of measurement and state reduction, to
the whole universe? What would realism about the quantum state then
imply? This book brings together an illustrious team of
philosophers and physicists to debate these questions. The
contributors broadly agree on the need, or aspiration, for a
realist theory that unites micro- and macro-worlds. But they
disagree on what this implies. Some argue that if unitary quantum
evolution has unrestricted application, and if the quantum state is
taken to be something physically real, then this universe emerges
from the quantum state as one of countless others, constantly
branching in time, all of which are real. The result, they argue,
is many worlds quantum theory, also known as the Everett
interpretation of quantum mechanics. No other realist
interpretation of unitary quantum theory has ever been found.
Others argue in reply that this picture of many worlds is in no
sense inherent to quantum theory, or fails to make physical sense,
or is scientifically inadequate. The stuff of these worlds, what
they are made of, is never adequately explained, nor are the worlds
precisely defined; ordinary ideas about time and identity over time
are compromised; no satisfactory role or substitute for probability
can be found in many worlds theories; they can't explain
experimental data; anyway, there are attractive realist
alternatives to many worlds. Twenty original essays, accompanied by
commentaries and discussions, examine these claims and
counterclaims in depth. They consider questions of ontology - the
existence of worlds; probability - whether and how probability can
be related to the branching structure of the quantum state;
alternatives to many worlds - whether there are one-world realist
interpretations of quantum theory that leave quantum dynamics
unchanged; and open questions even given many worlds, including the
multiverse concept as it has arisen elsewhere in modern cosmology.
A comprehensive introduction lays out the main arguments of the
book, which provides a state-of-the-art guide to many worlds
quantum theory and its problems.
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