 Originally Posted by Wayfaerer
The Heisenberg uncertainty principle refers to our knowledge, I don't think it defines the probabilistic nature of matter.
It's a result of the probabilistic nature of matter. It's not about knowledge or measuring, the effect occurs in interactions which aren't being measured. The common interpretation is that it just doesn't make sense to specify momentum and position to a greater precision than the inequality allows, because the particles just don't 'have' that accuracy. It's just how reality works.
Molecules up to 70 atoms have been observed to have probabilistic wave nature. Do you think the influence of molecules of that size couldn't effect our everyday experience of the universe, our brain chemistry and behavior for example?
I'm totally on the fence about that. You were talking about GR, though, I don't see the relevance of this.
 Originally Posted by Spyguy
If the smallest of particles move in a way that is indeed random, then I stand corrected. It is quite likely that there is a logic behind it that we are not seeing (yet) though. But truth to be told, I am not far enough in my education to know much about these particles, so I could obviously be wrong. I suppose this is a nice example of my own statement that we can't always tell because we do not know everything.
The evidence seems to suggest that there is no 'reality' behind it. It is possible to prove for instance that for some qualities of particles (which can take various values), the qualities literally do not exist until they are observed, at which point they attain a value. And on the face of it, the double slit experiment really seems impossible to explain without referring to a wave of probability, because it even works when you fire single particles through; they still somehow scatter with an interference pattern. I think there are some abstruse theoretical ways of still having 'hidden variables', but you have to chuck out a bunch of even more fundamental, intuitive stuff for it to work (like locality). I'm not a physicist though. PhilosopherStoned will be able to explain more about this.
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