**Stephen P. King** (*stephenk1@home.com*)

*Fri, 09 Apr 1999 20:30:16 -0400*

**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Next message:**Hitoshi Kitada: "[time 202] Re: [time 198] local systems, measurement, etc."**Previous message:**Stephen P. King: "[time 200] Re: [time 191] multi-stream interaction machine model"

In article <F8uMvJ.7K7@world.std.com>,

Doug B Sweetser <sweetser@world.std.com> wrote:

*>Why hasn't the Euclidean realm won over Minkowski or the reverse?
*

*>Appearently nature likes both pictures, or we would have gotten a clear
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*>winner by now. This sounds somewhat like the old wave/particle debate:
*

*>accepting both is the best way to move forward. Therefore the algebra
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*>of nature must be such that switching between both forms is trivial.
*

In article <7d97so$ur6$2@pravda.ucr.edu>, baez@galaxy.ucr.edu (john

baez) wrote:

*>Fundamentally it *is* trivial: you just replace the time variable t by it.
*

*>This goes by the fancy name of "Wick rotation". Then the Minkowski metric
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*>
*

*>- dt^2 + dx^2 + dy^2 + dz^2
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*>
*

*>becomes the Euclidean metric
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*>
*

*>dt^2 + dx^2 + dy^2 + dz^2
*

I think that the Wick rotation can only be viewed as a mathematical

trick

used to perform calculations with complicated theories, because the

change

between Euclidean and Minkowski metric alters the physics in GR (General

Relativity):

It is known that under the influence of gravitation, GR bends the

timespace in such a manner that clocks (in general) cannot be

syncronized

by Lorentz tranformations, due to the fact that in the curved Lorentz

space there is no unique path to make the time conversions along.

However,

with a Euclidian metric, there is always such a unique path, the

shortest

one, and it would be possible to develop a universal time for the

Universe.

So assuming the Wick rotation imposes some conditions on the GR

curvature,

and limitations on the effects of gravitation, it seems me.

Hans Aberg

http://www.mpi-stuttgart.mpg.de/docs/ANDERSEN/users/koch/Dipl/

http://otokar.troja.mff.cuni.cz/veda/gr-qc/97/abs/9705031.htm

http://ftp.esi.ac.at/Abstracts/abs498.html

http://www.chemistry.gatech.edu/rig/pubs/p8-1/node11.html

http://www.cpt.univ-mrs.fr/~coque/articles_html/CommentsNCG/CommentsNCG.html

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