Does Everything Quantum Happen?

I read the book -Quantum universe (Everything that can happen does happen) from Brian Cox and Jeff Forshaw. In me arises a strange question about subbtitle.Even I read the special chapter about this problem with the same tittle "Everything that can happen does happen" I did not find the answer of question like If something is possible ( has some possibility) to happen even only from or in matematical aspect does it mean that it will (even it does) happen because "Everything that can happen does happen" as a real quantum phenomenon ?
- Zaprayanka (age 26)
Plovdiv, Bulgaria

We don't actually know the answer to that. The basic form of quantum mechanics, quantum field theory, obeys something called the superposition principle. That means that the output state is just the sum of whatever would come out of each part of the input state. If nothing interrupts that behavior, then indeed everything that could happen does happen. However, different parts of what happens lose the ability to communicate with each other, and thus become the "many worlds" of that interpretation of quantum mechanics. On the other hand, there are other interpretations (modern versions of the Copenhagen interpretation, the Bohm interpretation, the macro-realist interpretation, ....) in which only one of the many possibilities is realized. It is extraordinarily difficult, at best, to obtain conclusive evidence as to which interpretation is correct. Many of us have favorites, but we can't convince each other.

Mike W.

(published on 11/11/2013)