From: sarfatti@well.sf.ca.us (Jack Sarfatti)
Subject: TIME TRAVEL 7
Organization: Whole Earth 'Lectronic Link
Date: Tue, 29 Sep 1992 05:48:55 GMT


22.	"... Visser, an expert theoretical hyperspace engineer,
decided he would like a flat surface for his travellers to
pass through, with no strong gravitational fields to
disturb them, and with the exotic [cosmic strings of
negative pressure inside] stuff kept well out of their way.
The structure he came up with is a six-sided surface of a
cube, with all the exotic stuff confined to struts along
the edges of the cube. A traveller who approaches and
crosses one face of such a cube will feel no tidal forces
and will encounter no matter, exotic or otherwise. 'Such a
traveller,' says Visser, 'will simply be shunted across the
universe' and will emerge from an equivalent cube in
another region of flat space - perhaps even in another
universe. p.182 Ref. Physical Review D Vol 39, pp.3182-84
(1989).

23.	"If cosmic string exists, it would be the ideal stuff to
thread Tipler's neutron stars on and stop them from
collapsing, just as it is the ideal stuff to hold open a
star gate manufactured out of a wormhole.... once you have
a wormhole that operates as a star gate (i.e., entrance to
a wormhole), providing a shortcut through hyperspace, it is
a simple matter, in principle, to convert it into a time
machine." p.206

24.	"... tow one end of the wormhole... take it on a long
journey at close to the speed of light, then bring it back
to rest alongside the other end of the wormhole... even
when the moving mouth has been brought back to rest, that
time difference remains. It is a real, physical property of
the region of space associated with the moving mouth: this
has aged less than the mouth that hasn't moved and is
therefore in the past of the mouth that stayed at home. ...
A traveller who jumps into the mouth that has moved will
emerge from the stationary mouth at the time corresponding
to the time on the clocks of the moving mouth. Suppose that
the moving mouth has traveled far enough, and fast enough,
to establish a time difference of one hour between the two
mouths. A traveller who starts out from the stationary
mouth when clocks there read twelve o'clock and takes, say,
ten minutes to cross over to 'the moving mouth' (the mouth
has stopped moving, of course...) will arrive there when
the traveller's watch and clocks at the stationary mouth
both read 12.10. But if the traveller now jumps into the
moving mouth, when he or she emerges from the stationary
mouth (almost instantaneously, according to the traveller's
own watch) the time there will be 11.10. The traveleeeer
can now cross quickly over to the moving mouth, arriving
there at 11.20, and jump in again, emerging from the
stationary mouth at 10.20. And the whole sequence can be
repeated, jumping back in time again and again, back to the
moment when the time difference between the two ends of the
wormhole was established." p.208

25.	The Cal Tech/Moscow consortium only "studies the way
billiard balls might become involved in interactions with
themselves when they travel through time tunnels. ...
assume that the Universe will allow only those solutions to
the equations that are self-consistent. ... every problem..
has an infinite number of self-consistent solutions ... The
billiard ball seems to be perfectly normal before it gets
near the time tunnel, then interacts with the tunnel system
in many different was\ys, forming a superposition of
states, before it emerges on the other side behaving once
again, in a perfectly normal fashion. ... quantum
theoreists have already worked out how to handle such
multiple realities ... The technique ... was first
developed by Feynman in the 1940s and is known as 'the sum
over histories' ...the presence of the traversable time
tunnel in effect creates a new kind of uncertainty, in the
region between the mouths of the tunnel, operating on a
much larger scale ... the sum over histories works
perfectly well in this new situation ... it does tell you
the precise probability of finding the billiard ball in a
particular place, moving in a particular direction, after
its time tunnel encounter... the probability that that the
ball starts out moving along one classical trajectory and
ends up moving along a different one turns out to be zero.
...we are not ignoring the self-inconsistent solutions
after all. They are still there, in the addition of
probabilities, but they make such a tiny contribution to
the overall sum that they have no real influence over the
outcome of the experiment." pp. 209-213 only the self-
consistent solutions constructively interfere at an
extremum of the action. The self-inconsistent solutions
cancel each other out in destructive interference far from
the action extremum of the calculus of variations. In this
scenario the future influences the present (p.213)
"according to Thorne this means it ought to be possible, in
principle, to carry out a set of measurements on the
behavior of billiard balls before any attempt to construct
such a time machine has been made, and work out from the
results whether or not a successful attempt to construct a
time tunnel involving CTLs will be made in the future."
Does chaos change this result?






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