Re: Formation of Closed Timelike Curves with Morris-Thorne wormholes

From: George Jones (george_llew_jones_at_yahoo.com)
Date: 02/20/05 

Date: Sun, 20 Feb 2005 23:04:01 +0000 (UTC)

Nick Maclaren wrote:
> In article <P-qdnexUXailOo_fRVn-sg@look.ca>,
> George Jones <george_llew_jones@yahoo.com> writes:
> |> Adam Getchell wrote:
> |> >
> |> > I'm reviewing some basic results from the Morris, Thorne, and Yurtsever
> |> > paper "Wormholes, Time Machines, and the Weak Energy Condition" (Phys.
> |> > Rev. Lett., Volume 61, Number 13), and I would like to check my conclusions.
> |>
> |> Suppose the mouths of the wormhole are initially close together and at
> |> rest with respect to a particular inertial reference frame for the
> |> external flat spacetime. Now let the mouths play the roles of the twins
> |> in the twin paradox, i.e., mouth 1 stays at rest with respect to the
> |> original reference frame, while mouth 2 moves out and back.
>
> Is this really the best way to think of this problem? I may be
> confused, but my take on this is rather different.

Maybe not, but I do think it is the best way to get at the time machine
aspects of the situation. However, my presentation maybe wasn't as clear
as it might have been.

I give a few more details in my response to Adam's response to my
response to Adam's original post.

Regards,
George

> What I think that that paper is saying is that, if spacetime is
> multiply connected, more-or-less arbitrarily manipulable AND
> Einstein's formulae apply over the whole of its surface, then
> there is a breach of causality. But all three conditions are
> needed to prove this for a single wormhole.
>
> It is well-known that a breach of causality is an inconsistency
> in temporal ordering, and it is also well-known that that any
> inconsistency in a basic model can lead to two equivalent analyses
> giving different answers, so it is not surprising that two people
> get different results.

Relevant Pages

  • Re: Musings On Wormholes
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