The Grand Unified Theory (GUT) is a theoretical framework in particle physics that attempts to unify the three fundamental forces of the Standard Model—electromagnetism, the weak nuclear force, and the strong nuclear force—into a single force. The idea behind GUT is that at high energy levels, these three forces are manifestations of a single underlying force, much as different types of magnetism can be seen as different aspects of the same magnetic force.
Appears to be an unsolved physics problem. TODO why? Don't they all fit into the Standard Model already? So why is strong force less unified with electroweak, than electromagnetic + weak is unified in electroweak?
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