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Is that really a 'physical' aspect, or a mathematical one? Newtonian mechanics can be (I think) derived from lower level principles.
So do you mean something that is a consequence of possible 'theory of everything', or a part of it?
I'm not dead certain whether "physical" and "mathematical" can be completely disentangled. I'm assuming that gravity following an inverse square law is just a fact which couldn't be deduced from first principles.
I'm not sure what "theory of everything" covers. I thought it represented the hope that a fundamental general theory would be simple enough that at least a few people could understand it.