This figure was the classic illustration of force unification, although it turns out that unification doesn't happen, even under SUSY, with the constraints of recent high precision coupling constant measurements.
Woit at his "Not Even Wrong" blog shares some slides he did for a podcast on grand unified theories of physics, which try to combine the three forces of the Standard Model into a facets of a single force, typically within a single Lie group, rather than the SU(3) x SU(2) x U(1) of the Standard Model. He explains that:
The main goal of the slides is to explain the failure of the general paradigm of unification that we have now lived with for 50 years, which involves adding a large number of extra degrees of freedom to the Standard Model. All examples of this paradigm fail due to two factors:
- The lack of any experimental evidence for these new degrees of freedom.
- Whatever you get from new symmetries carried by the extra degrees of freedom is lost by the fact that you have to introduce new ad hoc structure to explain why you don’t see them.
9 comments:
so what happens in the GUT scale ? do the 3 forces converge ?
There is a very famous SUSY diagram that shows the three coupling constants of the SM forces converging at the GUT scale as they run with energy scale. But with current subsequent more precise data, it has been determined that there is no unified point of convergence without new unspecified physics at high energies.
so do you think that there are new unspecified physics at high energies?
"do you think that there are new unspecified physics at high energies?" No. I don't think that there are new physics at high energies.
In part, this is because now that the Higgs mass is known, the Standard Model is mathematically consistent up to the GUT scale, at least.
so are strong and ew force ever unify
They have the same coupling constant at one point, but they don't "unify", they just keep going in the same directions that they were going.
are strong and ew 2 different aspect of the same force
"are strong and ew 2 different aspect of the same force" Not in the Standard Model of Particle Physics.
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