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Replies: 2   Last Post: Jan 8, 2013 1:51 PM

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 J. Antonio Perez M. Posts: 2,736 Registered: 12/13/04
Posted: Jan 8, 2013 5:30 AM

On Tuesday, January 8, 2013 11:03:07 AM UTC+2, Hannu Poropudas wrote:
> If you try to construct a galaxy model or universe model where time
>
> travel is possible without any paradoxes
>
> you have to satisfy following two axioms C1 and C2 and the definition:
>
>
>
> C1 (Locality). The laws of motion inside any region U do not depend on
>
> anything outside of U.
>
>
>
> C2. In any causal spacetime the laws of motion must be compatible with
>
> any initial data.
>
>
>
> Definition. The paradox is the inconsistency of some laws of motion
>
> satisfying conditions (C1,C2) with initial data fixed in a causal
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> region.
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>
>
> Reference:
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>
>
> Krasnikov, S. 2002.
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>
> arXiv:gr-qc/0109029v2 27 Mar 2002.
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> (C1 on p. 6, C2 on p. 7 and Def. on p.10.) pages 1-17.
>
>
>
> My model of a galaxy mentioned in my Master of Thesis (Poropudas,
>
> Hannu, 2006. Geodesic Algebras. Oulu University) satisfies all of
>
> these.
>
>
>
> Best Regards,
>
>
>
> Hannu Poropudas

Great, mazat tov to you, but

(1) What has this to do with mathematics?

(2) Are you selling out those galaxies?

Date Subject Author
1/8/13 J. Antonio Perez M.
1/8/13 Brian Q. Hutchings