> On 4 Aug 2018, at 23:32, [email protected] wrote:
> 
> AFAIK, no one has ever observed a probability wave, from which I conclude the 
> wave function has only epistemic content.


Then you need to explain how that epistemic content interfere in nature. Your 
idea might make sense, and indeed if we believe in a collapse (as you have to 
do if you believe in QM and that the superposition does not apply to us) the 
idea that consciousness collapse the wave is perhaps the less ridiculous idea. 
That idea has indeed be defended by von Neumann, Wigner, and some others. But 
has been shown to lead to many difficulties when taken seriously by Abner 
Shimony, as well guessed by Wigner itself. Obviously that idea would be 
inconsistent with Mechanism.

There is no probability waves. There is only an amplitude of probability wave, 
and the weirdness is that we have strong indirect evidence that the amplitude 
of that wave is as physically real as the particles that we can observe, 
because the particle location is determined by that wave having interfered like 
wave usually do. In particular, even if send one by one, the particles will 
never been found where the wave interfere destructively, and the pattern on the 
screen will reflect the number of holes, and their disposition. 

It is OK to say that probability comes from ignorance, and that the wave 
describe that ignorance, the extraordinary thing is then that  this ignorance 
interfere independently of you.





> So I have embraced the "shut up and calculate" interpretation of the wave 
> function.


That can be wise. Nobody can enforce the search of the truth. It is frustrating 
because we can’t be sure if we progress toward it or the contrary, and it is 
shocking because truth always beat fictions.



> 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

That remark deserves your point and diminish your credibility. It also suggests 
that you are a “True Believer” in something.

Assuming Mechanism in cognitive science, you don’t need quantum mechanics to 
understand that there are infinitely many relative computational states 
corresponding to you here and now emulated by infinitely many universal 
machines. Even without mechanism this is a theorem of arithmetic using only 
Church thesis. With mechanism, we have to derive the “guessable wave" from a 
statistics on those computations, and so we can test Mechanism if it leads to 
more, or less extravaganza than Nature. It fits up to now. So with Mechanism, 
we get the *appearance* of many interfering “worlds”, and this without any 
worlds, from just the natural numbers and the laws of addition and 
multiplication. I will show that with the combinators as it is much shorter 
(but still long) than showing this with the numbers. This is known by logicians 
since the 1930s (I mean that a universal Turing machine is an arithmetical 
object). Computationalism, or Indexical Digital Mechanism imposes a Many-Dreams 
internal interpretation of Arithmetic (or combinator theory, or game-of-life 
theory, … we have to assume only one universal machinery).

Bruno




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