On Mon, May 23, 2016 at 04:40:00PM +0000, Bruce  Johnson wrote:
> > On May 23, 2016, at 2:25 AM, (via tml list) <xxxxxx@simplelists.com> wrote:
> > That's gonna cause major changes in the curvature of space-time
> > sending out "ripples". Some of that could easily come out as EM
> > radiation (there should be some distinctive gravity waves as well).
>
> If you can detect gravity waves that small, There Is No Hiding Anywhere.

Not at all.  Gravitational waves corresponding to highly nonlinear
changes in the structure of spacetime (e.g. opening a connection from
jumpspace) should be expected to be astronomically greater in
magnitude than everything else.

Waves associated with ordinary movement are ridiculously tiny.  In
ordinary circumstances, conservation of energy-momentum means that
almost all of the field variations cancel, and the speeds and
accelerations that can ordinarily occur make the rates of change of
quadrupole moments microscopic.  If the whole planet Jupiter started
accelerating at 6 gees out of the solar system, LIGO probably wouldn't
register a thing.

In our reality, the only sources strong enough to create spacetime
deformations comparable with a jump exit are merging black holes. They
are also the source of the only gravitational waves we have detected
so far, from a distance of more than a billion light years.  They were
associated with much larger scales of at least a few hundred
kilometres, but that gives an idea of the energies that could be
involved in changes of spacetime structure.  If a 2 cm wormhole
suddenly opened near Sirius, LIGO should be able to detect the pulse 9
years later.

- Tim