Is the time of the collapse of the wave function empirical?
Suppose there is a very long von Neumann chain of observations of a quantum system. Suppose also practically irreversible decoherence happens very early along the chain. We can have an entire class of models parameterized by the point along the chain past the point of irreversible decoherence where the wave function "actually" collapses. Can we distinguish between these models empirically?
Is it even possible to push this point to the future of Jan 2013 so that as of Jan 2013, we are still in an uncollapsed superposition?
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