Abstract
Almost a century after the mathematical formulation of quantum mechanics, there is still no consensus on the interpretation of the theory.
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The group \(\mathop {\mathrm{Aut}}\nolimits (Q)\) may, in fact, be construed as a topological group by defining, for each \(\epsilon >0\), an \(\epsilon \)-neighborhood of the identity to be \(\{ \sigma \mid |p_\sigma (x)- p(x)| < \epsilon \) for all x and \(p \}\). We may then directly speak of the continuity of the map \(\sigma \), in place of the condition that \(p_{\sigma _t}(x)\) is continuous in t.
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More precisely, we have a projective unitary representation of \(\mathbb {R}\), but such a representation of \(\mathbb {R}\) is equivalent to a vector representation. (See, e.g., Varadarajan [5]).
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Historically, of course, it was not such interferometry experiments, but rather spectroscopic experiments that lead Schrödinger to his equation.
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This is reminiscent of Aristotle’s famous sea battle in De Interpretatione: “A sea battle must either take place tomorrow or not, but it is not necessary that it should take place tomorrow neither is it necessary that it should not take place, yet it is necessary that it either should or should not take place tomorrow.”
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For details, see J. Conway and S. Kochen, The Geometry of the Quantum Paradoxes, Quantum [Un]speakables, R.A. Bertlemann, A. Zeilinger (ed.), Springer-Verlay, Berlin, 2002, 257.
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Acknowledgments
Mathematics Department, Princeton University. Dedicated to the memory of Ernst Specker. This work was partially supported by an award from the John Templeton Foundation.
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Appendix: Summary Table of Concepts
Appendix: Summary Table of Concepts
General mechanics | Classical mechanics | Quantum mechanics | |
---|---|---|---|
Properties | \(\sigma \)-complex | \(\sigma \)-algebra | \(\sigma \)-complex |
\(Q = \cup B\), with B a \(\sigma \)-algebra | \(B(\Omega )\) | \(Q(\mathcal {H}\}\) | |
States | \(p: Q\rightarrow [0, 1]\) | \(p: B(\Omega )\rightarrow [0, 1]\) | \(w: \mathcal {H}\rightarrow \mathcal {H}\) |
\(p\mid B\), a probability measure | a probability measure | Density operator | |
\(p(x)=\mathop {\mathrm{tr}}\nolimits (wx)\) | |||
Pure states | Extreme point | 1 dim operator | |
of convex set | \(\omega \in \Omega \) | i.e. unit \(\phi \in \mathcal {H}\) | |
\(p(x)=\left\langle x,x\phi \right\rangle \) | |||
Observables | \(u: B(\mathbb {R})\rightarrow Q\) | \(f:\Omega \rightarrow \mathbb {R}\) | \(A: \mathcal {H}\rightarrow \mathcal {H}\) |
homomorphism | Borel function | Hermitean operator | |
Symmetries | \(\sigma :Q \rightarrow Q\) | \(h:\Omega \rightarrow \Omega \) | \(u: \mathcal {H}\rightarrow \mathcal {H}\) |
automorphism | canonical | unitary or | |
transformation | anti-unitary operator | ||
\(\sigma (x)=uxu^{-1}\) | |||
Dynamics | \(\sigma :\mathbb {R}\rightarrow \mathop {\mathrm{Aut}}\nolimits (Q)\) | Liouville equation | von Neumann |
representation | \(\partial _t \rho =-[H, \rho ]\) | -Liouville equation | |
\(\partial _t w_t=-\frac{i}{\hbar } [ H, w_t] \) | |||
Conditionalized states | \( p(x) \rightarrow p(x \mid y)\) | \(p(x) \rightarrow p(x \mid y)\) | \(w\rightarrow ywy / \mathop {\mathrm{tr}}\nolimits (wy) \) |
for \(x,y\in B\) in Q | \(=p(x \wedge y)/p(y)\) | von Neumann | |
\(p(x \mid y)=p(x \mid y)/p(y)\) | -Lüders Rule | ||
Combined systems | \(Q_1 \oplus Q_2\) | \(\Omega _1 \times \Omega _2\) | \(\mathcal {H}_1 \otimes \mathcal {H}_2\) |
direct sum of | direct product of | tensor product of | |
\(\sigma \)-complexes | phase spaces | Hilbert spaces |
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Kochen, S.B. (2017). A Reconstruction of Quantum Mechanics. In: Bertlmann, R., Zeilinger, A. (eds) Quantum [Un]Speakables II. The Frontiers Collection. Springer, Cham. https://doi.org/10.1007/978-3-319-38987-5_12
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