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Helena Wells
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According to Bell's theorem quantum mechanics is not local.How can we combine it with Special Relativity which is local and gives us another successful theory?
There's a good answer here:Helena Wells said:According to Bell's theorem quantum mechanics is not local.How can we combine it with Special Relativity which is local and gives us another successful theory?
*__*PeroK said:There's a good answer here:
https://physics.stackexchange.com/questions/76036/how-does-qft-help-with-entanglement
Helena Wells said:According to Bell's theorem quantum mechanics is not local.
Helena Wells said:According to Bell's theorem quantum mechanics is not local.
Helena Wells said:According to Bell's theorem quantum mechanics is not local.How can we combine it with Special Relativity which is local and gives us another successful theory?
Helena Wells said:According to Bell's theorem quantum mechanics is not local.How can we combine it with Special Relativity which is local and gives us another successful theory?
atyy said:Bell's theorem says that quantum phenomena are incompatible with local causality, but does not rule out compatibility with relativistic causality (terminology varies, I follow https://arxiv.org/abs/1503.06413).
As others told you, there are different notions of "locality". QFT is local in one sense but nonlocal in another.Helena Wells said:According to Bell's theorem quantum mechanics is not local.How can we combine it with Special Relativity which is local and gives us another successful theory?
PeterDonis said:Looking at the terminology in the paper, the key "locality" criterion (the one I described in post #5 and the one that implies the Bell inequalities, and which is violated by QM) is the one the paper calls "Bell-local" (Definition 6, p. 9). As for "relativistic causality", that condition, as the paper defines it (Postulate 2, p. 12), is weaker than the "QFT locality" condition I gave in post #5--it only says that spacelike separated events cannot be the cause of each other, not that they must commute.
The paradox arises from the fact that quantum mechanics and special relativity, two of the most successful theories in physics, seem to contradict each other in certain situations. Quantum mechanics describes the behavior of particles on a very small scale, while special relativity explains the behavior of objects moving at high speeds. However, when trying to combine these two theories, some of their fundamental principles appear to be incompatible.
Scientists have proposed various theories and models to reconcile the paradox between quantum mechanics and special relativity. Some of these include the theory of quantum field theory, which combines quantum mechanics and special relativity, and the theory of loop quantum gravity, which attempts to unify all of the fundamental forces of nature, including gravity.
While experiments have been conducted to test the predictions of both quantum mechanics and special relativity, there has not been a definitive experiment that can resolve the paradox between the two. This is because the paradox arises from the fundamental principles of these theories, which cannot be tested directly.
Some scientists believe that the paradox can be resolved by modifying one or both of the theories, while others suggest that a completely new theory may be needed to fully explain the behavior of particles at the quantum level and at high speeds.
Resolving the paradox between quantum mechanics and special relativity is important for our understanding of the universe and how it works. It could also lead to the development of new technologies and advancements in science, as well as provide a deeper understanding of the fundamental laws of nature.