Re: Quantum Time Travel

From: Russell Standish <>
Date: Fri, 28 Apr 2000 10:40:50 +1000 (EST)

> -- Russell Standish <> wrote:
> > A lot of things have measure, not just observer
> > moments. For example, all strings in the Schmidhuber
> > plenitude have a measure given by the
> > Universal Prior. Not all strings are observer
> > moments.
> You're playing with words. The point is a measure
> distribution must be measure *of something*. Thus it
> makes no sense to speak of "the measure distribution"
> given a wavefunction, unless you state what it is
> measure *of*. The only measure distribution we have
> been dealing with in that context is of
> observer-moments. I call that M(c) where c is a label

Not at all true. A lot of discussion has taken place in this list re
measure of strings in a Schmidhuber plenitude.

Measure is always taken to be the strength or density of a particular
object from within an ensemble (continuous or otherwise) of
objects. It is readily related to a sampling probability when the
measure distribution is normalisable.

Schroedinger's equation gives a measure distribution for outcomes of
particular observables, given certain constraints (a Hamiltonian and a
boundary condition). An observer moment must be the conjunction of
some vast array of observables having particular values.

> for an observer-moment, which I take to be a
> computation step.

Taking observer moments to be a computation step quietly introduces a
whole slew of assumptions, I wouldn't like to take on faith. Tread

My own preference is to talk about a quantum history, which under some
(perhaps rather flaky) assumptions, could be identified with the
concept of observer moment.


> =====
> - - - - - - -
> Jacques Mallah (
> Physicist / Many Worlder / Devil's Advocate
> "I know what no one else knows" - 'Runaway Train', Soul Asylum
> My URL:
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online and get email alerts with Yahoo! Messenger.

Dr. Russell Standish Director
High Performance Computing Support Unit, Phone 9385 6967
UNSW SYDNEY 2052 Fax 9385 6965
Room 2075, Red Centre
Received on Thu Apr 27 2000 - 17:38:55 PDT

This archive was generated by hypermail 2.3.0 : Fri Feb 16 2018 - 13:20:06 PST