> Il 4 agosto 2018 alle 23.32 [email protected] ha scritto:
>
> AFAIK, no one has ever observed a probability wave, from which I conclude
> the wave function has only epistemic content. So I have embraced the "shut up
> and calculate" interpretation of the wave function. I also see a connection
> between the True Believers of the MWI, and Trump sycophants; they seem immune
> to simple facts, such as the foolishness of thinking copies of observers can
> occur, or be created, willy-nilly. AG
>
Frankly I cannot understand, from the following famous page, whether
Schroedinger thinks the wavefunction as ontic or epistermic or both!
Erwin Schroedinger - § 7. The psi-Function as a Catalogue of Expectations.
Continuing with the exposition of the official teaching, let us turn to the
psi-function
mentioned above (§ 5). It is now the instrument for predicting the probability
of
measurement outcomes. It embodies the totality of theoretical future
expectations, as laid
down in a catalogue. It is, at any moment in time, the bridge of relations and
restrictions
between different measurements, as were in the classical theory the model and
its state at
any given time. The psi-function has also otherwise much in common with this
classical
state. In principle, it is also uniquely determined by a finite number of
suitably chosen
measurements on the object, though half as many as in the classical theory.
Thus is the
catalogue of expectations laid down initially. From then on, it changes with
time, as in
the classical theory, in a well-defined and deterministic ("causal") way - the
development
of the psi-function is governed by a partial differential equation (of first
order in the time
variable, and resolved for dy/dt). This corresponds to the undisturbed motion
of the
model in the classical theory. But that lasts only so long until another
measurement is
undertaken. After every measurement, one has to attribute to the psi-function a
curious,
somewhat sudden adaptation, which depends on the measurement result and is
therefore
unpredictable. This alone already shows that this second type of change of the
psi-function
has nothing to do with the regular development between two measurements. The
sudden
change due to measurement is closely connected with the discussion in § 5, and
we will
consider it in depth in the following. It is the most interesting aspect of the
whole theory,
and it is precisely this aspect that requires a breach with naive realism. For
this reason,
the psi-function cannot immediately replace the model or the real thing. And
this is not
because a real thing or a model could not in principle undergo sudden
unpredictable
changes, but because from a realistic point of view, measurements are natural
phenomena
like any other, and should not by themselves cause a sudden interruption of the
regular
evolution in Nature.
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