Re: Quantum Time Travel

From: Jacques Mallah <>
Date: Mon, 27 Mar 2000 11:35:49 -0800 (PST) wrote: writes:
> Renormalizing, one must choose > arbritrarily
> a reference unit Y; then the absolute measure of X can be stated as
> M(X)/M(Y).

OK. Both of us take a ratio. At least we have this in common.
Normalized Measure = M(X)/M(Y).

The difference between us is that:
1) I constrain M(Y) to be the absolute measure of the observer himself such
that the normalized measure of the observer (as observed by him) is precisely
one. All his other observations are similarly normalized according to his own
2) You believe that M(Y) can be (more or less) arbitrarily chosen.

    OK. The advantages of my approach are

1) It does not require any special definition of identity, while your approach seems to give one a fundamental role.

2) In principle, it allows all kinds of (statistical) retrodictions. Your approach seems to only allow a few kinds.

3) It is unclear how you deal with time based on your previous and current statements. In my approach it is clear that each observer-moment has some measure, and a set of related observer moments can be used for a 'person' if desired, so that the person's total measure is the sum of that of his constituent observer-moments. This clearly rules out QTI.

4) In the MWI of QM the measure of an observer in a 'branch' is defined. This is proportional to dM(total)/dtau (tau ~ clock speed) in my approach. In your approach it must be divided by an identity-dependent factor resulting in possible near-zombies.


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               Jacques Mallah (
         Physicist / Many Worlder / Devil's Advocate
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Received on Mon Mar 27 2000 - 12:12:21 PST

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