In the 2000s, quantum mechanics and grand unification theory provide similar opportunities.

Might be a reason why we can't fit gravity into any of those grand unification theories .

This idea is known as the grand unification theory.

The next step is a grand unification theory, which would include the fourth force, gravity.

Such a variation would contradict Lorentz invariance, but could provide a clue for unification theory.

Proton decay is a prediction of many grand unification theories.

The well-known grand unification theory had two directions of research in the 1980s and '90s.

The first experimental evidence for these electroweak unification theories was the discovery of the weak neutral current in 1973.

The grandest unification theory of them all got its start in 1948, when two remarkable publications appeared.

But he is also working on the grand unification theory to explain all the forces of the universe - and that may seem paradoxical.