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Posy McPostface
Is it assumed that Hilbert space is an infinite manifold that the non-collapsing wave function occupies in Everettian QM?
Thank you.
Thank you.
The indeterminacy is inherent in the Born rule, which works similarly no matter how many or few dimensions are in the Hilbert space.Posy McPostface said:So, my next question is that if Hilbert space is infinite dimensional in QM, does that contribute to quantum indeterminacy?
Gigaz said:because of the finite size of the universe
Gigaz said:The Hilbert space can have finite or infinite number of dimensions. I think most physicists would concede that any real Quantum system is probably limited to a finite (though excessively large) number of states because of the finite size of the universe and Planck limits.
bhobba said:That's one reason I like the Rigged Hilbert Space formulation.
From the start you recognize the states you work with are not physically releasable - its just introduced for mathematical convenience.
No. It's just math, and math routinely works with things that aren't physically realizable.Posy McPostface said:Doesn't that imply metaphysics or some variety of Platonism for or given the existence of the wavefunction in infinite dimensional Hilbert space?
Posy McPostface said:Doesn't that imply metaphysics or some variety of Platonism for or given the existence of the wavefunction in infinite dimensional Hilbert space?
It doesn't imply Platonism, but Everett's idea makes sense or is the result of a platonist view of physics.Posy McPostface said:Doesn't that imply metaphysics or some variety of Platonism for or given the existence of the wavefunction in infinite dimensional Hilbert space?
He meant "non-compactness" of the Lorentz group (I'd rather say Poincare group since the spatial translations also play a crucial role).PhysicsExplorer said:My friend, who is a physicist, had this to say to me not long ago, when I confronted him on Hilbert space ~
''If the representation is to be unitary, it is infinite-dimensional by the compactness of Lorentz group.[...]''
tom.stoer said:It doesn't imply Platonism, but Everett's idea makes sense or is the result of a platonist view of physics.
For an instrumentalist there is no reason to worry about collapse or no collapse, what a collapse means or what the wave function "really describes"; all she cares is if the wave function can be used to calculate possible outcomes, probabilities and expectation values for measurements. For a Platonist - who understands the mathematical formalism as something that encodes reality behind mere observations, i.e. something that really exists out there, for somebody who thinks beyond empirism - the collapse contradicts the unitary time evolution and cannot be real in the same sense as this time evolution. Therefore she will avoid the collapse at all cost, including the acceptance of the reality of the branch structure of the wave function predicted by unitary quantum dynamics, especially due to decoherence.
Many proponents of the Everett interpretation seem to be Platonists; some do explain this in detail, e.g. Deutsch.
tom.stoer said:Many proponents of the Everett interpretation seem to be Platonists; some do explain this in detail, e.g. Deutsch.
Hilbert space is a mathematical concept that represents the state space of a quantum system in Everettian quantum mechanics. It is a complex vector space with an inner product structure that allows for the calculation of probabilities for different quantum states.
In Everettian QM, Hilbert space is seen as a physical reality rather than just a mathematical tool. This means that all possible quantum states exist simultaneously in the same physical space, rather than collapsing into a single state as in other interpretations.
Hilbert space is at the core of Everettian QM, as it provides a mathematical framework for understanding the branching of parallel universes in the many-worlds interpretation. It also allows for the calculation of probabilities for different quantum states, which is essential for making predictions in quantum mechanics.
No, Hilbert space cannot be visualized in the traditional sense as it exists in a high-dimensional mathematical space. However, some people use diagrams or illustrations to represent the branching of parallel universes in the many-worlds interpretation.
Currently, there is no direct experimental evidence for the existence of Hilbert space in Everettian QM. However, the many-worlds interpretation has been successful in making accurate predictions and is consistent with all current experimental data in quantum mechanics.