On Thursday, April 5, 2018 at 12:25:02 AM UTC-5, agrays...@gmail.com wrote:
>
>  Does a macro object, say a billiard ball, have a definite wave function? 
> That is, does it have one in principle, even if it can't be written down? 
> If one can speak of the wf of the universe, one would think individual 
> macro objects would also have wf's. TIA, AG
>

A large object is made of particles that have quantum wave functions. 
Largely these cancel each other in a grand interference. This enhances the 
appearance of classical or macroscopic behavior. If you can prepare the 
wave functions of all the atoms in a large system so they have the same 
form this can lead to quantization on the large. This happens with 
Bose-Einstein condensates and similar quantum phase states --- here phase 
meaning a thermodynamics type of phase, but one determined by quantum 
fluctuations.

LC

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