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the theory of relativity & quantum mechanics.
The most known theory in quantum mechanics would be the Broglie-Bohm theory. Other popular theories are the string theory, quantum entanglement, and SchrÌ_dinger's cat.
nothing, they appear to contradict each other.
There is no reasonable alternative to quantum mechanics, at least not something that can even compare with the predictive power and experimental accuracy as quantum theory. If you want to make predictions about things happening at small scales you cannot do without quantum mechanics. Also note that certain models which are now considered as possible theories of everything (e.g. string theory) all expand upon quantum mechanics, they do not make quantum mechanics invalid or unnecessary.
Einstein struggled academically as a child and faced rejection from universities early in his career. He also faced challenges in his relationships, including two failed marriages. In his scientific work, he encountered resistance to his theories and struggled to reconcile quantum mechanics with his own theories of relativity.
Quantum mechanics.
Albert Einstein developed the theories of general relativity and special relativity. He also did work in quantum theory. (He won a Nobel prize for his work with light.)
Improved knowledge of the atom via new experiments and development of new theories (e.g. quantum mechanics).
Albert Einstein was a theoretical physicist whose work revolutionized our understanding of the universe. His theories of relativity fundamentally changed the way we view space, time, and gravity. He also made significant contributions to the development of quantum mechanics and the theory of light.
Some other theories humans have devised are:The Big Bang theory of cosmological expansionThe theories of general and special relativityThe germ theory of diseaseAtomic theory and quantum mechanics
Principles of Quantum Mechanics was created in 1930.
The distinction is sometimes made to distinguish normal quantum mechanics (which does not incorporate special relativity) and quantum field theory (relativistic quantum mechanics). Since we know special relativity is correct it is the relativistic form of quantum mechanics which is true, but non-relativistic quantum mechanics is still used, because it is a good approximation at low energies and it is much simpler. Physics students typically study regular quantum mechanics before moving on to quantum field theory.