Okay, hypothesize your standard wormhole:
two spherical manifolds in space-time which are
identified, so that an object that intersects with one
of them emerges from the other. Also, an object with
mass x that goes into mouth A and emerges from
mouth B increases the apparent mass of mouth A by x,
and decreases etc. mouth B etc.
Such a configuration seems to me to be
inherently unstable. Once A has a positive mass and B
has a negative mass, A will have a gravitational field
which will attract objects with positive mass and B has a
gravitational field that will repel objects with positive mass.
Over time, inevitably, the magnitude of the mass of each
mouth will increase without limit.
This would be a slow process at first, of course,
but inevitably one of the mouths would 'collide' with a
sizable body; say Jupiter. As it descends into the
atmosphere, pressure would be sufficient to drive gasses
through the wormhole, emerging in an expanding cloud
around the other mouth. As the process continues, the
mass of the mouth in Jupiter would gradually increase, so
that its gravitational pull would begin to supplement
pressure to drive the flow of material, and the other mouth
would begin to immediately repel the gasses that came
through. At the end of the process, you would have a
Jupiter-massed wormhole mouth, and a negative-Jupiter-
massed wormhole mouth inside a huge expanding cloud
of impure hydrogen.
I'm not sure how sensitive wormholes might be to
extremes of temperature and pressure, but one wormhole
mouth dropping into a star would be even more spectacular.
Eventually, the Schwarzchild radius of the mouth
with positive mass will exceed the radius of the mouth itself,
and that mouth of the wormhole will turn into a black hole.
I'm not sure what an object with a repulsive gravitational
field so strong that light can't reach it would 'look' like.
--
I'm not an actor, but I play one on TV!
George W. Harris For actual email address, replace each 'u' with an 'i'
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