Recent content by A. Neumaier

I don't think quantum mechanics needs to be changed - only its interpretation must be made more rational. This is what I think I achieved. The problem here is that observers are themselves quantum objects whose observations must be ultimately understood in terms of the unitary quantum...

Carl Friedrich Gauß!

What about my paper Quantum tomography explains quantum mechanics?

The Schrödinger equation is nonrelativistic, hence violates your principle!

It does not even reconstruct the canonical commutation rules for a harmonic oscillator, hence is far from a useful reconstruction.

https://philsci-archive.pitt.edu/26230/

This a mystery only for those who think the discrete quantum information approach carries the essence of quantum mechanics, and forgot the origins of modern quantum mechanics 100 years ago: Heisenberg discovered in 1925 that the observed Rydberg-Ritz combination principle is encoded in the...

And what is going on at coincidence measurements of entangled photons?

A good candidate for such an interpretation is the interpretation in terms of quantum tomography.

B (idealized), C (realistically) While there is no position operator (and hence no Schrödinger picture), photons still have (relativistic) wave functions. See What is a photon? in Chapter B2: Photons and Electrons of my Theoretical Physics FAQ. The wave function of a photon in vacuum is in the...

1. The use of symmetry (in the form of Lie algebras and Lie groups) organizes the vast material on quantum physics into a form that emphasizes the quantum-classical correspondence. 2. Emphasis is on conceptual understanding rather than on computational techniques. The latter are often simpler...

Yes, I was thinking of Hermitian operators; I corrected my statement.

The concept of operator relevant for QM is that of a 'densely defined operator', i.e., a linear operator A from a dense subspace of the Hilbert space into the Hilbert space; ; see https://en.wikipedia.org/wiki/Densely_defined_operator . The maximal such subspace is called the domain of A. All...

An extended version of the paper (in particular, with English translations of German quotes) is now published: https://www.mdpi.com/1099-4300/27/4/415

They must only be classically nonlocal. Note that Bell's theorem is not a theorem about quantum mechanics, but about classical local hidden variable theories. Thus the viaolation of the Bell inequalities only demonstrates that quantum mechanics is not a classical local hidden variable theory...