Janet on Physics

... or maybe Cosmology, ...

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Then I thought about Roger Penrose and his Twistor Theory. See Curt Jaimungal Talking With Roger Penrose and Sabine Hossenfelder on Physics Funding in Academia:


I looked it up and the original EPR experiment (1934) supposed that two particles were emitted from one source with opposite momenta, and then observers A and B could choose whether to measure position or momentum, and in either case would be able to infer the opposite of the other particle, independently of what the other observer had chosen to measure. The variant invented by Bohm (1951) was an electron-positron pair with opposite spins. In this the source of the particles is something in a "spin singlet" state, where the particles' net angular momentum is zero. See Wikipedia article https://en.wikipedia.org/wiki/Singlet_state

In a "Bohr-type model" atom the Azimuthal Quantum Number is supposed to determine the angular momentum for an electron in a given orbital. For an individual electron, however "Due to the spin–orbit interaction in an atom, the orbital angular momentum no longer commutes with the Hamiltonian, nor does the spin. These therefore change over time." See Wikipedia article https://en.wikipedia.org/wiki/Azimuthal_quantum_number

So maybe in this case is the T-symmetry that is part of the system. There is an anecdote of a telephone conversation between Richard Feynman and John Wheeler (1940) where they were talking about how odd it is that all electrons are identical, and so are all positrons, and Wheeler said something like "Maybe they're the same thing, just the electrons are going backwards in time?" I forget where I read this. See https://en.wikipedia.org/wiki/One-electron_universe

See also Jade on The Shape of Space. 


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Then I watched Janet modeling Tango dancers:


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In this model the dancers have an extra degree of  freedom, or maybe three, ...

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Toby explaining why the Dirac formalism is a bit dodgy: See Toby Looks at Some Remarkable PhD and Maters Theses.

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