Since the usual domains of applicability of general relativity and quantum mechanics are so different, most situations require that only one of the two theories be used. General relativity and quantum mechanics have been repeatedly validated in their separate fields of relevance. Quantum mechanics successfully implemented the Standard Model that describes the three non-gravitational forces: strong nuclear, weak nuclear, and electromagnetic force – as well as all observed elementary particles. On the other hand, quantum mechanics is a theoretical framework that only focuses on the three non-gravitational forces for understanding the universe in regions of both very small scale and low mass: subatomic particles, atoms, molecules, etc. General relativity is a theoretical framework that only focuses on gravity for understanding the universe in regions of both large scale and high mass: planets, stars, galaxies, clusters of galaxies etc.
These two theories upon which all modern physics rests are general relativity and quantum mechanics. Over the past few centuries, two theoretical frameworks have been developed that, together, most closely resemble a theory of everything. String theory and M-theory have been proposed as theories of everything. : 6 Finding a theory of everything is one of the major unsolved problems in physics. A theory of everything ( TOE or TOE/ToE), final theory, ultimate theory, unified field theory or master theory is a hypothetical, singular, all-encompassing, coherent theoretical framework of physics that fully explains and links together all aspects of the universe.
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