Copenhagen Definition and 70 Threads

So, let's say that a star 50,000 light years distant does not exist until it is observed. One day I look up and see a bright star and it's waveform collapses into existence as we know it. Now suppose my pet kitty observes it, does the waveform collapse? What if a tiny bug saw the star? It has...

Hi all, I have read in several places about an "old Copenhagen Interpretation" and I wonder what are the differences between the old one and the current one. I read several times Wikipedia article about CI but had no success finding any references about the old one. I guess that the old...

It will not have escaped the attention that the world nations have gathered in Copenhagen to save the globe from climage change. The Jakarta Post narrates. I wonder about this: But geologists read http://www.agu.org/pubs/crossref/1987/JB092iB06p04905.shtml...

Has anyone heard any of the details of the Copenhagen Agreement? Think there is any truth to this? http://online.wsj.com/article/SB10001424052748703574604574500580285679074.html?mod=googlenews_wsj

I don’t like CI. But I was always thinking that CI is an idealistic interpretation, based on the consciousness and the existence of intelligent observers. In Bohr’s time it was simple. He believed in a sharp line between quantum world and macroscopic world. Quantum event Q was registered by...

Many physicists say that they prefer the "Copenhagen" interpretation of QM, but it does not mean that all these physicists prefer the same (or even a very similar) interpretation. There are at least 4 very different interpretations that are sometimes referred to as "Copenhagen": 1. Shut up...

Can someone explain how Hardy's Paradox is resolved? As well, what could someone infer from this regarding both Copenhagen Interpretation and Bohm's theory?

I started this thread to continue the following discussion from the thread: https://www.physicsforums.com/showthread.php?p=2203566#post2203566" But you and Weinberg are both making a mistake in assuming ontological status to both the collapse of the wave function and to entanglement...

I don't like CI but let's play by its rules for a while So, in the mainstream CI wavefunction is non physical: it is just our subjective 'knowledge' of the system. So, I use an experimental device: I put a cat inside the box, and press a button. The device inside the box works based on...

Bohr believed that the observer effected the outcome of an experiment at the subatomic level, and it wasn't necessarily the photons used to measure the particle like in Hesienberg's Uncertainty Principle that effected the outcome. What was the basis of this idea if the only way to measure...

The Copenhagen interpretation, (the wavefunction collapse) is not what caught the interest and imagination of the scientific community. It was the Schrödinger's Cat. Is the cat alive or dead? “QGsquared” will not catch the imagination of the 10’s of thousands of interested people by saying...

Could someone explain to me how the delayed choice experiment is described within the framework of the Copenhagen interpretation? (Double slit experiment with two slits open but a late decission to measure the path of the particle). I do not understand how the deterministic evolution of the...

Just had four quick questions on the Copenhagen Interpretation (CI). 1. Where is the boundary between realm (classical) space and quantum space. I understand that there is no solid definition for this boundary, but where would we begin to see quantum events occur and see classical events...

Hello, First post. I have been doing a lot of reading in quantum physics, and I am really riled up about some things. First off, I get the feeling when reading those who defend the Copenhagen Interpretation (CI) that they are earnestly trying to put one over on me. I'm a rational guy. I...

Hi, Can we know the Copenhagen interpretation, a result of uncertainty principle? If you don't agree with that, mention your reasons to see taht will conclude a safe answer or not. Thanks. ------------------------ Formulate realities.

Hi, I just had this argument with this person on another forum and the gist of it was that he was saying collapse is predictable to within a negligible precision if you average out the results a huge number of identical wave-particles that had already collapsed. My contention was that...

I found a website that says: "The still-dominant "Copenhagen interpretation" of Quantum Theory developed by Niels Bohr, Werner Heisenberg, Wolfgang Pauli, and others says two basic things: 1. Reality is identical with the totality of observed phenomena (which means reality does not exist...

play "Copenhagen" by Michael Frayn Ok, this may seem a bit weird, and maybe it seems inappropriate for the physics forum... but eh, move it somewhere more appropriate if necessary. Ok, first, this is with regards to the play "Copenhagen" by Michael Frayn. if you've read it or seen it...

hiya! Does anyone know of any logical expressions of the Copenhagen Interpretation. I've read about it, I can summarize it, but I've never really seen anything other than discussions of it in pop-science books. I'd really like to break it down if I could.

Professor John Cramer, author of the transactional interpretation of QM, recently gave a talk at Boskone, the famous science fiction con, that sugggests a new experiment may be about to falsify the predictions of the Copenhagen and Many Worlds interpretations(and also decoherence and Consistent...