I am a physicist by the way, though not a very good one, and have only an MS degree. Having skimmed through the comments since this weekend, here are my two cents....Or three or four cents, as the case might be, if we're being graded for word count.
Sageous is right that there is an objective reality, we're not just projecting it in the manner that we project our dreams. We've argued about this at great length in other threads, and I hope I'm not being biased to say that the pro-objective-reality side has won the arguments. Similarly, its true that astral projection is basically a lucid dream, and that the perception of the physical world in such a dream is mostly imagined, its not real.
However....This isn't the whole picture, and that's a big part of the reason these arguments keep coming up. As physics-ignorant and maybe even logically impaired as the "life is but a dream" proponents may be, there is an element of truth in that perspective. We as human beings may not be projecting the physical world, but it does have some of those characteristics, and however it is that it does get projected, we don't seem to be entirely separate from that process even though its mostly beyond us.
Regarding quantum mechanics: There are macroscopic effects. The Schrodinger cat thought experiment was cooked up to illustrate this. More recently Schrodinger's cat has been re-branded as a metaphor for something that only happens to subatomic particles, in my opinion because that dodges a lot of confusing questions at the edge of current physics theory. But there was a reason Schrodinger described the problem the way he did, and it does seem to me to be valid as described for cats. The fact that the cat is not a coherent wave-function doesn't change this. From a standpoint inside the box, the wave-function is collapsed and the cat is alive or dead. But from a standpoint outside the box, the whole system is in an indeterminate state that doesn't get resolved until the system comes into contact with the external system. So to some extent, things that we are not personally in contact with really don't exist, at least not as far as physics theory is concerned. They exist as a restricted superposition of possibilities, so its not valid to say that they don't exist at all without us. And they concretely exist for themselves, and for other observers unconnected to us. But in some sense they exist in multiple ways which aren't necessarily consistent with the way in which they would exist for us if we made the observation. It is generally believed that these inconsistencies always get completely resolved in when the systems interact, and I think its indisputable that they do in general, and least from our perspective. But there isn't actually anything in the math that I know that says it has to be that way in an absolute sense. And from my personal experience I'm pretty sure that its not true. So the mystics are right in that regard, even though they're generally terrible at relating that view with the current scientific understanding.
In much the same way that I'm presumptuous enough to criticize mental yoga even though I'm not a swami, I'm pretty sure that a lot of working physicists don't understand these issues. It doesn't come up in relation to the research they do, and they just blow off anything that they can't grapple with effectively. This is actually a characteristic of a successful physicist, they are the ones who can consistently make high probability research choices and continue to get funding. But its bad for the philosophical development at the edge of the field, which in my view has been stagnating for decades.
Some physicists are materialists in the western atheist tradition, others are Buddhist, and many believe in paranormal phenomena. I haven't encountered anybody who seems to understand any of these issues. Certainly I don't. But I've explored it enough to think that I understand it a little bit better than the science journalism 'consensus' philosophical understanding. Even though I'm equally sure that a typical physicist understands quantum mechanics 1000 times better than the typical mystic who speaks in terms of quantum mechanics. Maybe the best we can do as 'beyond dreamers' is to say: We have no friggin' idea how phenomena X is possible, but here's what we experienced, here's some suggestive evidence, and here's what we did to eliminate the obvious fallacies in interpretation. Furthermore here are some limitations of the scientific method that makes certain knowledge on these subjects problematic, which we do understand. And though its very hard to prove such results for a general, public audience, here are some steps you can take, without giving up your objective honestly, if you have the time and inclination and want to discover something about it for yourself.
In most areas of science, there are large-scale dynamics that can be described in fairly straightforward way. But then there are also really small dynamics that have big effects, and which render certain kinds of problems very difficult. For example, the general way a wing works is trivial to explain even to a child, and for many things that understanding is adequate. However, the wing is 'big' compared to the thin layer of air right at the surface where physically important things happen on a really small scale. The math to deal with this kind of thing is really a bitch. Or to use a more colorful example, relativistic effects can generally be neglected when modelling atoms. But gold would not appear gold except for relativistic effects, so these do have to be taken into consideration when asking that question. My point here is that scientific theory is like this in almost all areas. Its really good for understanding the world we life in, insofar as we understand it. But there are areas, not always obvious in the linear, easily controllable realms where we're most comfortable, where theory breaks down almost completely. That's the way modelling is. A set of equations that describe an atom is not isomorphic to an atom. For some things the equations fail.
Sometimes people fall so much in love with the equations that they forget that there's more to reality. This is similarly true with sensory perceptions, which as I've mentioned earlier are a type of model, even though to a significant extent its a model that has evolved over hundreds of millions of years and is mostly involuntary. We're so used to it that we forget its there, but its not reality. An awful lot that isn't currently a part of our sensory model of the world is nevertheless real. And the model isn't actually wholly ingrained or beyond improvement. If you study it and improve your understanding of it, you can have new experiences.
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