Download Quantum Ontology: A Guide to the Metaphysics of Quantum by Peter J. Lewis PDF

By Peter J. Lewis

Metaphysicians should still be aware of quantum mechanics. Why? now not since it offers definitive solutions to many metaphysical questions-the conception itself is remarkably silent at the nature of the actual international, and a few of the interpretations of the idea on supply current conflicting ontological photographs. fairly, quantum mechanics is key to the metaphysician since it reshapes regular metaphysical debates and opens up unexpected new metaphysical probabilities. whether quantum mechanics offers few transparent solutions, there are solid purposes to imagine that any enough figuring out of the quantum international will lead to an intensive reshaping of our classical world-view not directly or different. regardless of the global is like on the atomic scale, it really is possibly no longer the swarm of debris driven round by means of forces that's usually presupposed. This booklet publications readers during the concept of quantum mechanics and its implications for metaphysics in a transparent and obtainable approach. the idea and its a number of interpretations are awarded with at the very least technicality. the results of those interpretations for metaphysical debates relating realism, indeterminacy, causation, determinism, holism, and individuality (among different subject matters) are explored intimately, stressing the radical shape that the debates take given the empirical evidence within the quantum area. whereas quantum mechanics would possibly not carry unconditional pronouncements on those matters, the diversity of chances in keeping with our wisdom of the empirical global is comparatively small-and each one chance is metaphysically revisionary ultimately. This ebook will attract researchers, scholars, and anyone else attracted to how technological know-how informs our world-view.

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Additional info for Quantum Ontology: A Guide to the Metaphysics of Quantum Mechanics

Sample text

Still, this only addresses the epistemic question; it doesn't even pretend to address the question of whether electrons have precise positions. This takes care of the representation of physical states and the measurement postulate in wave mechanics; all that remains is the dynamical law. This is the same Schri:idinger equation, now expressed in terms of continuous functions rather than vectors: . a at A tli-lfi(X, t) = Hlfi(X, t) 20 I Quantum Ontology The energy operator in this context is a differential operator: It turns one function of x into another function of x, and again depends on the system under consideration.

So there is no strategy for assigning properties to electrons that can yield better than 2/3 agreement for measurements in different directions. Our simple problem of assigning spin properties to electrons to reproduce the observed results turns out to be impossible! n Bell's theorem is perhaps the most celebrated of the no-go theorems, but a second theorem, proved by Kochen and Specker (1967), is arguably equally important.

If Bohr is right, then the last part of the EPR argument doesn't go through: We shouldn't say that IS) is a state in which the second electron has spin properties for the z and w directions simultaneously, because it is impossible to measure the spin of the first electron along both directions simultaneously. The most that can be said is that 1S) is a state in which the second electron may have a spin property for one of the two directions. This allows Bohr to rescue a sense in which quantum mechanics might be said to be complete: Even though the theory doesn't specify the spin of the second electron along the z-axis when the state is 1S), the theory does have the resources to represent the second electron as being spin-up REALISM I 31 along z or spin-down along z.

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