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Collapse of wave function ,does it really happens?why?

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closed as too broad by Aaron Stevens, ZeroTheHero, Cosmas Zachos, user191954, Buzz Jan 8 at 5:57

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ There is no spoon... $\endgroup$ – user6760 Jan 8 at 3:21
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    $\begingroup$ This is a hard question, about which whole books have been written. Have you poked around wikipedia for any relevant entries? recommend you have a look and then come back here if there's anything remaining that still puzzles you. -NN $\endgroup$ – niels nielsen Jan 8 at 3:56
  • $\begingroup$ No. Collapse doesn't happen. Read "The Fabric of Reality" by David Deutsch chapter 2. $\endgroup$ – alanf Jan 8 at 8:00
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Schlosshauer reviewed experimental data and concluded: "no positive experimental evidence exists for physical state-vector collapse" (Annals of Physics, 321 (2006) 112-149)

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    $\begingroup$ The notion of a wave function collapsing isn't a dynamical thing that is an observable though $\endgroup$ – InertialObserver Jan 8 at 3:24
  • $\begingroup$ @InertialObserver : The OP asks if collapse of wave function really happens, and my answer is there is no experimental evidence of that. $\endgroup$ – akhmeteli Jan 8 at 3:30
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    $\begingroup$ Something happens though whether you call it a "collapse" or not. It is an easily observable effect, e.g. in a double slit experiment. There was a wave and now it is no more. Sounds evidence enough, no? $\endgroup$ – safesphere Jan 8 at 7:36
  • $\begingroup$ @safesphere : No, there is no experimental evidence of deviations from unitary evolution. From the same article: "the universal validity of unitary dynamics and the superposition principle has been confirmed far into the mesoscopic and macroscopic realm in all experiments conducted thus far" $\endgroup$ – akhmeteli Jan 8 at 7:59
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    $\begingroup$ Well, I hear you, but I didn't say anything about "unitary evolution". It seems that you are assuming that I've implied this and that in my comment, but I really haven't. All I'm saying, it is easily observable that a wave is killed by measurement. This is an experimental fact. The wave was there, but no more. You can call it "collapse" or "murder", whatever, but the wave is destroyed. $\endgroup$ – safesphere Jan 8 at 8:20

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