Indeed, all the above readings of Everett seem to treat the no-collapse wave function of the universe as a real physical entity that reflects the non-separable state of the universe, and accordingly they involve state non-separability.
How does Bohmian mechanics justify the use of the "collapsed" wave function instead of the original one?
Instead, if decoherence takes place faster than collapse, then (as in von Neumann's case) the collapse mechanism can find 'ready-made' structures onto which to truly collapse the wave function.
Maybe all it takes to collapse the wave function, Dr. Zurek and his colleagues propose, is for a particle to undergo some kind of tiny disturbance, to come into contact with other particles.
(For discussion of this, see Eccles (1980), (1987), and Popper and Eccles (1977).) Still others argue that quantum indeterminacy manifests itself directly at a high level, when acts of observation collapse the wave function, suggesting that the mind may play a direct role in affecting the state of the world (Hodgson 1988; Stapp 1993).
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According to the Copenhagen view, it was the act of observation that "collapsed" the wave function of some particle, freezing it into one particular state, a location or velocity.
Not only does it draw an uncomfortable distinction between the observer and what he is observing; it also fails to answer the question of exactly how the act of observation collapses the wave function.
They have appealed especially to the role of the observer in the collapse of the wave function, i.e., the collapse of quantum reality from a superposition of possible states to a single definite state when a measurement is made.
In the GRW/Pearle collapse models, wave functions represent the most exhaustive, complete specification of states of individual systems.
It is called the "collapse of the wave function".
