I really liked your last paragraph and I agree with your conclusions about the other concepts as well. Time, although periodic in its momentum, like space and energy is observed linear in 4-D because we feel by symmetry that we are "in the middle" of the sphere, along the axis, rather than on the surface of the hyperspheres. This is a solid GR concept, and is the grounds for the QM work I posted. I had a nice exchange with Larry and he, of course is well aware of the importance of his work.

As Larry says in his abstract, the actual time separation of our inversely mapped states on opposite sides of the hypersphere is billions of Earth years, yet...and this is the miracle of it all, space and energy remain superimposed. Time in the dual "hemispheres" of the 7-sphere seems to pass us, as invariant reference frames, at the submicroscopic antipode of the universe within ourselves- in a linear fashion- and in two directions!

Larry's work is on the frontiers of science. I've ordered a copy of his technical book, published in 97.

Best Wishes,

Sam Cox