I make the dangerous mistake quite often of thinking I understand the concepts of quantum mechanics without actually being able to do any quantum cookery. But I am largely certain this question has a factual answer, or at least a generally accepted one.
If the title didn’t make it clear, my concern is what happens to particles at absolute zero, or indeed if they can ever reach absolute zero.
In my head, if a particle made it to absolute zero it would instantly be everywhere in the universe at the same time, making it extremely impossible to stay absolute zero for any period of time.
But then I think: hey, it is just this reason that absolute zero can’t even be theoretically reached, because eventually the uncertainty in position will become large enough that an interaction will have to happen before zero is ever reached.
The perspective I’m approaching this from is the “cold death” of the universe idea.
I vaguely remember reading a Scientific American article on Bose-Einstein Condenstates some time ago, but I do not recall at all what sort of temperatures were achieved and what the uncertainty in position implied other than the creation of a perhaps aptly named “super atom”. What kind of “size” or distance are we talking about here? Are there practical limits to approaching absolute zero because of the HUP? What sort of limits are we talking about here? Does not having a quantum theory of gravity limit realistic hypotheses here?
Sorry if this sounds way out in left field.