On 23-05-2020 23:01, 'Brent Meeker' via Everything List wrote:
On 5/23/2020 11:51 AM, smitra wrote:
My point is that identity is an intrinsic property of what
something
is now. The history of the of the constituent particles have no
affect
on the behaviors or operation of those particles. To say the
history
is relevant to identity is to add an arbitrary extrinsic property
which can be of no physical relevance.
This is a direct consequence of QM, you can't distinguish two
electrons, from each other.
But they still have locations and histories, c.f. Griffiths
consistent
histories interpretation of QM or Feynmann's path integral QM.
When
electrons make spots on the film in an EPR experiment the electron
that made this spot is not identical with the electron that made
that
spot in the sense of being the same electron. And in any case I
don't
see how the sameness of particles implies the sameness of complex
structures made of particles, i.e. persons.
Brent
Physics is local, all the relevant information to describe what I
feel right now is contained in my brain at this exact moment. While
this can all be explained in terms of information in the past, that
doesn't take away from the fact that it is also present right here
in my head. Also, not all the information was present in the past
state due to effective collapse of the wavefunction. In general, I
end up in a superposition of states which has the exact same
information content as the past state. I then find myself in one of
the possible components of such a superposition (in the
computational basis states of the classical algorithm that my brain
is running).
Saibal
In the MWI, there is never any increase in the total information. All
evolution is unitary and reversible. Local information appears
because event horizons make correlations (negative information)
inaccessible.
Brent
That's the case for the global wavefunction. But if you are in a
superposition of making a binary choice one way or the other with equal
amplitudes, then you will find yourself in one or the other part of the
superposition. So one bit of information appears in the sector you are
in which is essentially the information needed to specify in what sector
you are.
Saibal
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