Hidden variables Definition and 62 Threads

To move beyond the standard model, especially in terms of quantum gravity, I assume we need to make a decision on the existence of hidden variables in QM. It seems that a decision has been made against hidden variables, but I'm still confused as to why. It appears that the reasons are around...

I've read a lot of philosophical "blah, blah, blah" (pardon the euphemism) by QM physicists trying to noodle through why the exact location of a collapsed photon wave function is probabilistic in nature rather than determinative. One of theories I find most intuitively appealing says the...

A while ago I was having an interesting thread here about the possibility of local MWT, MWT as a local explanation of the entanglement experiments. In re-reading this discussion I was wondering whether the proposal of MWT as a local theory means: a) Hidden variables are necessary but MWT...

J.S. Bell (Physics Vol.1, No. 3, 1964) excludes from consideration any distribution \rho of the hidden variable \lambda that formally depends on the vectors a and b , except if \rho ( \lambda ,a,b) = \rho ' ( \lambda ,a) \rho ' ( \lambda ,b) i.e. if the distribution can be factored in a...

Is quantum mechanics (QM) local or nonlocal? Different formulations/interpretations (FI) of QM, with or without hidden variables, suggest different answers. Different FI's can be viewed as different algorithms, which leads me to propose an algorithmic definition of locality according to which a...

Related to QM hidden Variables?...is Dark Matter the Macro Scale equivilent to the Hidden Variables on QM scales?

and throughout all this I get the "feeling" that most of you just expect that the "laws" of physics, (whatever they ARE) will remain unchanged thoughout the future! This of course cannot be assumed! Time, space, matter, of ALL types could very well come to an END in the NEXT SECOND! Can...

Up to today no underlying hidden variables that determine what is called the quantum uncertainty have been demonstrated. Consider : We have a setting that includes a geiger counter and a computer. This computer has a button, which, when we press it, starts a clock. This computer is...

Have anyone done the GHZ experiment? As I understand it from a book I read QM predicts detections that hidden variables theories can't produce at all! If theese detections has been done then all hidden variables should be out of question even if the Bell experiments haven't been flawless!?

..From X. Chen, with dimensions 5 and 6 being timelike and constituting the hidden variables. http://www.arxiv.org/abs/quant-ph/0501034. This is not a "TD" type of theory, and Chen has the theoretical chops to have been an arxiv contributer for years. I know there has been interest in...

I think that fon Neumann's Theorem about unpossibility of Hidden Variables does not include the all kind of Hidden Variables. There is HV, which does not have the corresponding to one operator to one quantitative which measurable. In addition Bell's Inequality does not include this class of...

I've always though of particles in the following sense: If you do NOT measure/decohere a particle in some way, it exists ONLY as a probability wave--there is no "actual" number for each of its unknown quantity, just a probability of what it will be. There are no "hidden variables" that we...