Rick, Jonathan, Joy, Michael, and Tom:
As another author observed in a comment, "It's so hard to change others minds." Obviously this is related to the investment others have made in pushing their own model of understanding.
Rick described it beautifully [12 Sep @16:36]: "Many people pick one of these choices and run with it [which is optimal because] the collective will succeed faster by leaving no stone unturned."
We are all -- on Rick's thread -- admirers of Octonions. Unfortunately [or not?] each is pushing his own cart filled with his preferred goodies.
Despite yeoman's efforts Michael Goodband and Joy Christian have failed to converge. Joy's S7 is "physical space" while Michael's S7 is "particle space", which is compactified to produce a fermionic spectrum of topological defects, and *must* be added to S3, the physical [or spin?] space for a total of 10D. Although individual love of S0, S1, S3, S7 is shared, the models do not overlap in a meaningful way.
While I appreciate Quaternions and Octonions, I do not come to my theory through either symmetry groups or topology. Instead I focus on the physical behavior of physical fields implied by Maxwell's equations [he was first to write the gravito-magnetic equations that also fall out of general relativity].
This is quite a different approach than that exemplified by Lisi's E8, which, as I see it, is to find a large mathematical structure and try to show how it contains "everything", even making up new "things" to fill empty slots in the structure.
Now because of their own models [which are incompatible with each other despite a professed love of S0, S1, S3, S7] both Joy and Michael reject my model. But it does address some of Rick's concerns. Specifically, Rick claims that Octonions fully encompass electromagnetics and gravitomagnetics.
But Michael responds [6 Sep @ 18:46] that "A solely "octionic relativity" can't include both GR and the full gauge symmetries -- not enough degrees of freedom."
To which Rick responds, "It may be that ... the Standard Model actually does have too many knobs to twist" and allows himself to be guided by his intuition [as I do].
Michael responds with a "degree of freedom count" that shows 11 conserved "charges", three of which are color charges.
To which I respond: A gravitomagnetic theory of particles does not require color charges. The dynamics of the C-field achieve the purposes for which color was *invented*: Pauli asymmetric fermionic wave-function, "famous-factor-of-3", asymptotic freedom and quark confinement, and offers a way to compute the mass spectrum. Thus in this model at least 3 degrees of freedom vanish, putting us back to 8. [There are also implications for the S7 "fermionic spectrum of topological defects" but I'll stop here at 8.]
So we all agree that Octonions are important but we all disagree about the details. At this point I believe my own model actually fits within Rick's "algebra of everything".
[I don't expect to convince anyone. In three FQXi contests I've yet to see anyone give up his own model for another! And please spare me the Bell lecture.]
Thanks for fascinating discussions.
Edwin Eugene Klingman