HI,

2008/4/16, nichomachus <[EMAIL PROTECTED]>:
>
>  On Apr 16, 4:54 am, Bruno Marchal <[EMAIL PROTECTED]> wrote:
>  > Le 16-avr.-08, à 03:24, Russell Standish a écrit :
>  > > On Wed, Apr 16, 2008 at 02:22:23AM +0200, Saibal Mitra wrote:
>  >
>  > >>> First off, how is it that the MWI does not imply
>  > >>> quantum immortality?
>  >
>  > >> MWI is just quantum mechanics without the wavefunction collapse
>  > >> postulate.
>  > >> This then implies that after a measurement your wavefuntion will be
>  > >> in a
>  > >> superposition of the states corresponding to definite outcomes. But we
>  > >> cannot just consider suicide experiments and then say that just
>  > >> because
>  > >> branches of the wavefuntion exist in which I survive, I'll find
>  > >> myself there
>  > >> with 100% probability. The fact that probabilities are conserved
>  > >> follows
>  > >> from unitary time evolution. If a state evolves into a linear
>  > >> combination of
>  > >> states in which I'm dead and alive then the probabilities of all these
>  > >> states add up to 1. The probability of finding myself to be alive at
>  > >> all
>  > >> after the experiment is then less than the probability of me finding
>  > >> myself
>  > >> about to perform the suicide experiment.
>  >
>  > >> The probability of me finding myself to be alive after n suicide
>  > >> experiments
>  > >> decays exponentially with n. Therefore I should not expect to find
>  > >> myself
>  > >> having survived many suicide experiments. Note that contrary to what
>  > >> you
>  > >> often read in the popular accounts of the multiverse, the multiverse
>  > >> does
>  > >> not split when we make observations. The most natural state for the
>  > >> entire
>  > >> multiverse is just an eigenstate of the Hamiltonian. The energy can
>  > >> be taken
>  > >> to be zero, therefore the wavefunction of the multiverse satisfies the
>  > >> equation:
>  >
>  > > One should also note that this is the ASSA position. The ASSA was
>  > > introduced by Jacques Mallah in his argument against quantum
>  > > immortality, and a number of participants in this list adhere to the
>  > > ASSA position. Its counterpart if the RSSA, which does imply quantum
>  > > immortality (provided that the no cul-de-sac conjecture holds), and
>  > > other list participants adhere to the RSSA. To date, no argument has
>  > > convincingly demonstrated which of the ASSA or RSSA should be
>  > > preferred, so it has become somewhat a matter of taste. There is some
>  > > discussion of this in my book "Theory of Nothing".
>  >
>  > Actually, I am not sure the ASSA makes sense once we take into account
>  > the distinction between first and third person point of view. Comp
>  > immortality is an almost trivial consequence that personal death cannot
>  > be a first person experience at all. Quantum immortality is most
>  > plausibly equivalent with comp immortality if the "quantum level"
>  > describes our correct comp substitution level. But this does not mean
>  > that we can know what shape the comp immortality can have, given that
>  > comp forbids us to know which machine we are or which computations bear
>  > us.
>
>
> Why is this the case? Whether Comp is true or not, it would seem that
>  the direction of physical research and investigation is in the
>  direction of discovering the presumed foundational TOE that accounts
>  for everything we observe. Say, for example, that it were possible to
>  create in a computer simulation an artificial universe that would
>  evolve intelligent life forms by virtue of the "physics" of the
>  artificial universe alone. Why, in principle, is it not possible for
>  those intelligent beings to discover the fundamental rules that
>  underlie their existence? They will not be able to discover any
>  details of the architecture of the particular turing machine that is
>  simulating their universe (even whether or not they are in fact being
>  computed), but I don't see any a priori reason why they would not be
>  able to discover their own basic physical laws.

Because from the 1st person pov you cannot tell which computation
(there are an infinities) support you hence the RSSA because the
probability of your next states are relative to the current state you
are. With the no cul de sac (means there exists no universe state
which does not have a next state) comp predict comp immortality...

>  Max Tegmark has indicated that it may be possible to get some idea of
>  which mathematical structure bears our own existence by approaching
>  from the opposite direction. Though we may never know which one
>  contains ourselves, it may be possible to derive a probability
>  distribution describing the likelihood of our location in the
>  ensemble.

That means the universe is not one mathematical structure nor the
multiverse is, but the infinite set of functionnaly equivalent
computation... well from a certain point of view these universes
aren't differentiated...  So it is difficult to say that at any moment
we are in such or such computation, we're in all of them (that support
us).

>  To go back to the comments you were making about the Prestige:
>
>  If the subject of a quantum immortality experiment finds himself
>  improbably alive, is he in some sense guilty of the murder of the
>  other versions of himself? Or not, since those are merely third person
>  experiences. What constitutes a first person experience? It seems that
>  you are defining it as an uninterrupted consciousness since comp
>  implies the  "almost trivial consequence that personal death cannot be
>  a first person experience at all." I am confused by exactly what is
>  meant by first and third person experiences.
>

You cannot experience death if you define death by the absolute end of
your conscious experience. Since you can't be conscious if you're dead
nor knowing it (which would require consciousness) by definition,
death is not a first person experience (either if comp is true or not,
this holds true for this definition of death).

Regards,
Quentin Anciaux

-- 
All those moments will be lost in time, like tears in rain.

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