Posted: May 17, 2016 12:27 pm
twistor59 wrote:DavidMcC wrote:
If you read my posts in this thread more carefully, you will notice that I have already dealt with large-scale quantum effects, such as superfluidity and superconductivity - they have a critical temperature to become thermodynamically possible, OK?
You haven't "dealt" with anything. You claimed:Re the bolded bit: wrong. If the coherence length is shorter than the distance between particles, then no wavefunction applies, and it is a classical system. OK?
EDIT: Also, the coherence length goes down as the mass goes up.
With reasonable sized systems (i.e. ones not taking up a significantly large fraction of the entire universe) the quantum models apply. You'd be a dick to try to apply them because it would be too complex, but apply they do. There is no critical mass at which quantum mechanics suddenly ceases to apply. OK?
Depends what you mean by "apply". The wavefunction has two aspects: amplitude and phase. In MOST macroscopic systems, phase becomes irrelevant, because it is scrambled (the wavelengths being so short). That is what I mean by QM not applying.