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From: Georges Quenot <Georges.Quenot.domain.name.hidden>

Date: Wed, 07 Jan 2004 10:44:59 +0100

Georges Quenot wrote:

*>
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*> [...]
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*> I would be interested in reading the opinions of the participants
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*> about that point and about the sense that could be given to the
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*> question of what "happens" (in the simulated universe) in any non-
*

*> synchronous simulation "when" the simulation diverges ?
*

Thanks for the replies. Until now I feel a bit confuse with them,

possibly because I do not have an appropriate idea of what is meant

exactly by "computable" and/or by what accounts for a simulation

of the universe. I probably have some naive intuition about them.

So maybe it would help to clarify some points:

By computable, is by default assumed something like physically

computable using current or future technologies or only formally

computable (possibly considering virtual computers containing very

much more memory locations than there are particles in the visible

universe and for computation times very much longer than the actual

age of the universe) ? In the latter case, does the memory of the

computer need to be finite or can it be considered as unlimited ?

Do the simulation has to end within a finite time or can the

simulated universe be something like an asymptotic state of its

description in a given formalism ? Alternatively or in other words,

could the simulated universe be in some way the limit of a series

of approximations computed with increasing available memories and

computation times ? Is "computable" relative to the universe as a

(spatio-temporal) whole or only to given supbarts of it ?

Also I feel some confusion between the questions "Is the universe

computable ?" and "Is the universe actually 'being' computed ?".

What links do the participants see between them ?

Finally, what link is there between the computability of the

universe and the possibility of its exact description in the

context of arithmetic ?

Maybe too many questions for a single post. I didn't go through

the whole archive and there might well be already answers to most

of these so I welcome any reference to appropriate previous posts.

By the way, are there some FAQs about these questions ?

Georges.

Received on Wed Jan 07 2004 - 04:46:21 PST

Date: Wed, 07 Jan 2004 10:44:59 +0100

Georges Quenot wrote:

Thanks for the replies. Until now I feel a bit confuse with them,

possibly because I do not have an appropriate idea of what is meant

exactly by "computable" and/or by what accounts for a simulation

of the universe. I probably have some naive intuition about them.

So maybe it would help to clarify some points:

By computable, is by default assumed something like physically

computable using current or future technologies or only formally

computable (possibly considering virtual computers containing very

much more memory locations than there are particles in the visible

universe and for computation times very much longer than the actual

age of the universe) ? In the latter case, does the memory of the

computer need to be finite or can it be considered as unlimited ?

Do the simulation has to end within a finite time or can the

simulated universe be something like an asymptotic state of its

description in a given formalism ? Alternatively or in other words,

could the simulated universe be in some way the limit of a series

of approximations computed with increasing available memories and

computation times ? Is "computable" relative to the universe as a

(spatio-temporal) whole or only to given supbarts of it ?

Also I feel some confusion between the questions "Is the universe

computable ?" and "Is the universe actually 'being' computed ?".

What links do the participants see between them ?

Finally, what link is there between the computability of the

universe and the possibility of its exact description in the

context of arithmetic ?

Maybe too many questions for a single post. I didn't go through

the whole archive and there might well be already answers to most

of these so I welcome any reference to appropriate previous posts.

By the way, are there some FAQs about these questions ?

Georges.

Received on Wed Jan 07 2004 - 04:46:21 PST

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