Artificial gravity field

http://www.esa.int/SPECIALS/GSP/SEM0L6OVGJE_0.html

So, it's a small step, but it's pretty interesting work.
Which got me thinking about artificial gravity fields.

Now, we see them in Sci-Fi a lot..on ships and such, and being used in propulsion systems, but from my (basic) understanding of how gravity works, they are basically making a dent in the fabric of space, to produce the gravity.
Which, ofcourse basically means that they are artificially increasing the mass of the object to a point where the effect is noticable.
Now, in order to achieve 1g, you would need a mass the size of the earth.

A gravity field to achieve 1g in a small area no more then a few hundred meters across will have some...interesting results.
Last i checked, if the earth was crushed down to 15 km radius, and maintained it's mass, it would become a black hole.
Who's to say that when they power up that ship with 1g it wont instantly make a black hole?
Now, if it doesn't make a black hole, who's going to dare to turn it on close to any planet? or on a planet for that matter?
Notice that when the moon comes close to the earth, that we suffer from increased tidal, and seismic activity?
So, turning on a gravity field of 1g on, or close to earth, or any other planet, may be more dangerous then people really think.
It'll be basically the same as moving to planets on top of eachother..

Any thoughts?

A decent post on /sci/?  gotta bump this.

What I wonder about this is if this gravioelectromagnetic thinger can have both a positive and a negative like the electrogmagnetic fields.  if this is the case, basically, out earth-> orbit problems are solved.

another interesting thought: 

in the article it said that the effects of the gravolectromagnetic field or whatnot was about 10^18 times more powerful than previously predicted.

in space. things cool down to temperatures low enough for superconductivity all on their own (given no nearby heat source)...

astronomers have been haveing issues explaining how stars on the outside of galaxies orbit at the same speed that stars near the center of a galaxy orbit.  they have explained this with dark matter at the edge of those galaxies.  if hydrogen or helium could display the same characteristics as this exparament when orbiting a galaxy, it seems that it may be possible that this genereated field would fill the gap dark matter is now...just a though.