Scientific tragedy of late Einstein
. He tried hard to unify all fundamental forces in a framework like his General Relativity
. While GR ranks among the greatest achievements of physics, UFT never worked out.
According to CF von Weizsäcker
, Einstein's UFT was far from explaining
sharply separated types of elementary particles, while Heisenberg
's attempts on UFT came a little closer.
It's an unsolved problem to fit gravitation
and quantum physics
into one mathematical framework.