I have now prepared an updated revision of a paper demonstrating how the compact fifth dimension of Kaluza-Klein is responsible for the observed intrinsic spin of the charged leptons and their antiparticles. The more global, underlying view, is that all intrinsic spins originate from motion through the curled up, compact dimension. This latest draft is linked at:

__Intrinsic Spin and the Kaluza-Klein Fifth Dimension, Rev 3.0__

Thanks to some very helpful critique from Daryl M. on a __thread at sci.physics.relativity__, particularly post #2, I have entirely revamped section 5, which is the heart of the paper wherein we establish the existence of intrinsic spin in , on the basis of “fitting” oscillations around a loop of the compact fifth dimension (this is to maintain not only orientation but entanglement version). From this approach, quantization of angular momentum in naturally emerges, it also emerges that the intrinsic angular momentum in the ground state is given by .

In contrast to my earlier papers where I conjectured that the intrinsic spin in projects out into the three ordinary space dimensions by virtue of its orthogonal orientation relative to the plane, which was critiqued in several Usenet posts, I now have a much more direct explanation of how the intrinsic spin projects out of to where we observe it.

In particular, we recognize that one of the objections sometimes voiced with regards to a compactified fifth dimension is the question: how does one “bias” the vacuum toward one of four space dimensions, over the other three, by making that dimension compact? This was at the root of some Usenet objections also raised earlier by DRL.

In this draft — and I think this will overcome many issues — we require that at least as regards intrinsic angular momentum, the *square *of the obtained for the intrinsic angular momentum in , must be *isotropically* shared by all four space dimensions. That is, we require that there is to be no “bias” toward any of the four space dimensions insofar as *squared *intrinsic spin is concerned. Because emanates naturally from the five dimensional geometry, we know immediately that , and then, by the isotropic requirement, that as well. We then arrive directly at the Casimir operator in the usual three space dimensions, and from there, continue forward deductively.

For those who have followed this development right along, this means in the simplest terms, that rather than use “orthogonality” to get the intrinsic spin out of and into ordinary space, I am instead using “isotropy.”

There is also a new section 8 on positrons and Dirac’s equations which has not been posted before, and I have made other editorial changes throughout the rest of the paper.