RevdTess wrote: ↑07 Jan 2023, 16:36
UndercoverElephant wrote: ↑07 Jan 2023, 15:14
RevdTess wrote: ↑07 Jan 2023, 14:16
This is very much a faith/philosophical position at the moment, hence your use of "I believe".
I could not disagree more strongly. This has nothing to do with faith and everything to do with science. If there is no reality external to human minds,
why does science work? Magic? Luck? No. Science works for a reason, and if there's no external world then there is no credible explanation. This belief is justified, hence it is not faith-based.
Then you shouldn't use "I believe" but rather "There is such a thing as a reality external to human minds".
Semantically, there can be such a thing as a justified belief. Just because it is justified doesn't change the fact it is a belief.
But scientists don't agree on this. And don't seem to agree on whether it can be proven.
It's not a scientific question. It is philosophy of science, though quantum physicists have little option but to at least hold an opinion about it. And no they don't agree.
Still, I think that's where the science is leading.
Which science? QM? This isn't science. It's 100% philosophy.
Personally I see God as sustaining physics, not intervening from outside. I think this is compatible with hard determinism.
That's indistinguishable from deism. From my point of view, this is an impoverished philosophy on which to base theology. It's depressing and nihilistic. I just can't imagine why anybody with a spiritual worldview would choose to believe such a thing. But maybe you didn't consciously choose.
Fair enough. I'm not sure if I believe in an external world. It depends on what form you believe that world can take. If you believe there are particles out there whizzing around without observers, then I would disagree.
I believe there are information states without observers, and these can be in an indeterminate state (a superposition). What the information is instantiated in -- what noumenal reality is "made of" -- I don't care. We don't have a word for it and there's no point in inventing one. It's
noumenal information.
If you believe there is a quantum probability function that independently exists
and collapses into particles when observed, then yes I believe an external world exists.
A "quantum probability function" is an abstract mathematical object. I believe the information exists, I don't care what form it takes. It doesn't have to "be a function".
1: The many worlds interpretation, which is purely deterministic and probably what you mean by "block universe". (You might also have meant something relating to philosophy of time, involving the past existing but the future not existing (this is usually called "expanding block universe", where the present moment is the expanding edge). If so, this isn't a position in QM.)
This is an interpretation that can - as I understand it - never be proven. It is a reality that may or may not objectively exist and we could never know.
None of the metaphysical interpretations can be proved. Which one you believe in is a philosophical choice. It depends on the rest of your belief system. We will never be able to objectively choose between them (as a community).
2: Copenhagen or other objectively random interpretation. This involves only one timeline, but it is objectively random (according to the laws of QM) which one manifests.
I currently think Copenhagen is more likely to be the best representation of objective reality.
Why? It's an ad-hoc mess. Why should reality behave on the "quantum scale" in a way that is apparently contradictory to the way it behaves at our scale? Why is there a "Heisenberg split"? Where is it? Why is it where it is? Nobody can answer these questions. The whole thing is entirely unnecessary. John Von Neumann - the last great polymath and quite possibly the cleverest human being ever to have lived - rejected the CI on the grounds that these questions have no coherent answers. He was the first person to formalise the mathematics of QM, by declaring that there was just one universal wavefunction, and it was "collapsed" from the outside by the consciousness of observers. He did this for reasons of mathematical efficiency and elegance, not for philosophical/spiritual reasons. But it opens the door for a reconciliation between science and mysticism that the western world desperately needs. That's why I am so mystified as to why a theologian would reject it in favour of soul-destroying determinism which is not supported by science or logic.
3: Von Neumann / Stapp interpretation aka "consciousness causes collapse". Again, only one timeline, but the quantum dice can be loaded. I can see no reason why any theologian would opt for anything else, since the agent that loads the dice could include both God's mind/will and human minds/will.
This is a fascinating idea, and fondly promoted by my main maths professor at uni in the early nineties. It's what got me interested in the first place. I think recently experiments have cast doubt on it though?
Which experiments?
I can't say I understand those experiments but I've watched a bunch of videos on experimentalists trying to prove that consciousness is not necessary for collapse to occur and I was pretty convinced, but I never did physics beyond A Level so what do I know.
Nobody said consciousness was necessary for collapse to occur, so those people failed to understand the position they were trying to falsify. All Von Neumann said was that it is metaphysically and physically
possible, and that it leads to a better mathematical formalisation. He has not been refuted. His position has been updated by Henry Stapp.
Fair enough. It's woolly theology after all. I was trying to convey the idea that perhaps objective reality only manifests when it experiences an interaction with something.
That sounds like idealism, presuming the thing it interacts with is an Observer. It's not really objective at all.
Otherwise it's just a block of possibility. If a quantum system only collapses when observed, did it exist beforehand?
Yes. It existed
in a superposition. Why can't noumenal reality be blurry? It is still objective, in the sense that it cannot take on any value it likes -- the possibilities are finite. This makes objective reality real and objective in the sense that the biblical miracle of the feeding of the 5000 is physically impossible. It doesn't matter how much you load the quantum dice, it won't make one basket of fishes and loaves feed 5000 people. But it does make other sorts of "miracles" possible -- ones which are physically possible but highly improbable (which could include
revelation). I am describing a situation where the laws of physics are still limiting what is possible in reality, but not limiting supernatural causes loading the quantum dice. It means we can still strictly respect science, but we don't have to "disenchant reality".
Does one's answer to that question have anything at all to do with scientific realism? I expect you will answer 'no', in which case I have to admit I still don't understand your argument yet. But I do find it fascinating so don't give up.
If reality only exists when perceived then you aren't a scientific realist. You're an idealist, but a rather strange one, because you're also a determinist.
"We fail to mandate economic sanity because our brains are addled by....compassion." (Garrett Hardin)