Can Feynman rules be adapted for Grand Unified Theory?

[kokolovehuh]

Hi all,
Having learned much about technicalities in Grand Unified Theory, I have known that it's basically pursuing the belief that coupling constants of all interactions converge to the same value.
My question is, do Feynman rules still hold in this theory (b/c each type of interaction involves different propagator, vertex factor, etc.)? or have the physicists already accounted for it, then how?
Lastly, is GUT suggesting given same before and after energies in a relativistic frame (KE is not trivial), the identity of those parent/daughter particles are irrelevant because they'd couple the same way with same lifetime&cross section (at very high energy limit)?

Thanks in advance!

SQW

 

[AndyW]

,

As a scientist who has also studied Grand Unified Theory (GUT), I can say that the concept of coupling constants converging to the same value is a key aspect of this theory. This is because GUT aims to unify the three fundamental forces of nature (electromagnetic, weak, and strong) into one single force at very high energies. In order for this unification to occur, the coupling constants of these forces must become equal, as you have correctly understood.

In terms of Feynman rules, they still hold in GUT, but they may be modified to account for the unified nature of the fundamental forces. For example, the propagators and vertex factors may be adapted to represent the unified force rather than individual forces. This is an ongoing area of research and there is not yet a definitive set of Feynman rules for GUT.

Regarding the identity of particles in GUT, it is true that at very high energies, the distinction between particles becomes less relevant as they all interact in the same way. However, at lower energies, the differences between particles are still important and can be observed in experiments. Additionally, the concept of particle identity is still important in GUT as it helps us understand the fundamental building blocks of the universe.

I hope this helps answer your questions and provides some insight into the current understanding of GUT. Keep up the curiosity and enthusiasm for science!