Apart from beauty, is there reason to believe the known forces to be parts of one "superforce?"

The response to a similar question seems incomplete in that it does not address unification; there is evidence to believe the forces all have the same strength at high energies, but to be the same force implies all matter is affected equally, which does not seem to be the case considering neutral particles are not affected by the electromagnetic force, and leptons are not affected by the strong force.

To imply that they are the same would there necessarily have to be some thought (or technologically-advanced) experiment in which forces can be "converted" into each other?

Take, for instance, the electromagnetic force. A charged particle stationary to an observer has only an electric field. If this particle is in motion relative to the observer the electric field is measured to be "converted" to a magnetic field, and charged particles experience a magnetic force if in motion relative to a magnetic field.

In other words, is it valid to say that analogously that if and only if there is some action(s)/frame(s) of reference that would make the other three forces measurable from some initial state in which there is only one then the four fundamental forces are part of a larger one?

  • $\begingroup$ This is not really a fair question. It's more of a philosophy dissertation idea. It's a good one, but I doubt you'll get many one off answers. As I read this you are asking several questions at once. The first one, likely no there is no reason at this point. Your statement about affecting matter equally is a little confused. At high energies YES they do in some sense but we live in the cold dead universe (and that is a SM idea, gravity is out). To your last question I say no, finding a frame as you state is not a precondition for unification (analogous to EM). $\endgroup$ – ggcg May 24 '18 at 22:33
  • $\begingroup$ @ggcg, thank you for your comment. When you state "At high energies yes they do..." are you referring to the equal interaction of forces with matter? I think I'm getting myself confused about the whole notion of unification; if there is no reason to pursue a unifying theory and there is no necessary "switching" as described above, is there any use whatsoever to the pursuit of such a theory, that which a possible quantum gravity cannot achieve? $\endgroup$ – Quantumness May 25 '18 at 1:10
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    $\begingroup$ It has been a long time since particle physics but if I remember correctly scattering data from collider experiments extrapolates to a common energy or all three theories, Electromagnetic, Weak, and Strong, have a common asymptotic value. Again (really digging back into 20+ years ago). This is strong circumstantial evidence of unification. But gravity doesn't fit, and to me that is the most important force. ;-) $\endgroup$ – ggcg May 25 '18 at 1:26
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    $\begingroup$ I did study QG 20+ years ago but do not recall that it achieved anything back then. And even if the loop space representation gives a consistent picture of GR and QG there is still a desire to unify (a desire not a need). Maybe GR and the rest (in a QFT GFT paradigm) are truly different. $\endgroup$ – ggcg May 25 '18 at 1:28

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