On 11/14/2019 3:58 AM, Bruno Marchal wrote:

On 11 Nov 2019, at 12:35, Bruce Kellett <[email protected] <mailto:[email protected]>> wrote:

On Mon, Nov 11, 2019 at 8:37 PM Bruno Marchal <[email protected] <mailto:[email protected]>> wrote:

    On 10 Nov 2019, at 20:01, Alan Grayson <[email protected]
    <mailto:[email protected]>> wrote:

    On Sunday, November 10, 2019 at 5:42:50 AM UTC-7, Bruno Marchal
    wrote:

        Once the cat is alive + dead, he remains in that state for ever.


    *Then how come we NEVER observe that state? AG*

    Because the observable are defined by their possible definite
    outcome, and for reason already explained, macroscopic
    superposition decoder, that is get entangled with the environment
    at a very high speed. So, if you look at the cat in the a+d
    state, you are duplicate almost immediately into a guy seeing the
    cat alive + the guy seeing the cat dead, and QM explained why
    they cannot interact, although they might interfere themselves.


That is exactly a preferred basis -- which you seem to want to deny.

I have never denied a preferred basis, as preferred by the evolution of the type of observer we are (like molecular biological organism, where position plays an important role). What I deny is that the MWI implies that some base are more important in physics than other. The universal wave function can be described in any base, but the internal observer will “choose” the base corresponding to their most useful sensory apparatus.

That would imply that we could build instruments to detect states other than position, momentum, and others related to our senses.  We do that to a degree, but it is difficult and I don't think there is any chance that we could build a detector corresponding to an arbitrary projection operator.

Brent

It is a bit like a planet and life: there are “preferred planet” having the right conditions for life to develop. Similarly, consciousness can only differentiate in the base in which Turing universal machine can also differentiate.

Bruno




Bruce

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