On 17 Feb 2016 at 16:38, Bruce  Johnson wrote:

> Einsteins theory only holds for objects in *this* universe. 
>
> Jump is a kind of `wormhole´ (technically an `Einstein-Rosen Bridge´
> ) that removes the ship from the space/time continuum where
> Relativity holds sway. 

Not really. That's more of a "wormhole" situation, which has other
unfortunate consequences.
>
> The ship isn´t moving faster than light, it´s taking a shortcut that
> light cannot take. Any relatavistic effects of their speed of travel
> would need an observer in J-space.
>
> The outside observer simply sees the ship vanish at one point in
> space then re-appear 168 hours later in another point in space. 

Alas, the way relativity works is that it describes *relationships*
between events in our spacetime. and those events are due to the
*geometry* of said space-time.

Since the event of "ship enters jump at X" and the event of "ship
exits jump at Y" are both in *this* universe, relativity either
controls them or is invalid.

If relativity holds, then the relationship between those two events
is "time-like" rather than "space-like". Which has really annoying
consequences.

This is because the first event happens sooner than light can cross
the difference between X & Y.

That means that in various frames of reference, the ship will exit
jump *before* it enters jump. And those reference frames are just as
vaild as the ones where exit occurs after entry.

This is generally taken to be a bad thing.

And it has nothing do with jumpspace, just the spacetime coordinates
of the entry and exit points.

It doesn't matter *how* you get from point X at time A to Point Y at
time B. Just the spacetime coordinates involved.
--
Leonard Erickson (aka shadow)
shadow at shadowgard dot com