Don't worry, this isn't going to rip space-time apart à la the Half Life video game. What these clever folks have done is created an analogous system to a black hole, using rubidium atoms cooled to near absolute zero, which makes them act in a particularly weird way (known as a Bose-Einstein condensate). Then they've used lasers to manipulate this condensate so that it traps sound waves, similar to how a black hole's event horizon traps light.

By doing so, they've managed to make a system that exhibits Hawking radiation, like a black hole is theorized to, and have detected this radiation. A similar experiment back in 2008 already managed to make a "mini black hole", but they weren't able to detect Hawking radiation.

I've linked to the Nature article, but Scientific American has a more down-to-Earth overview.