Black Hole eating Black Hole? Well, it's possible but it has some complications too.
Black hole have an “near to infinity” density and hence an event of back hole eating black hole is very unlikely. We accept the fact, which says that black hole merging is possible, but it'll take millions of year. During the counter revolution phase of two Black Holes, they become slow and slower due to their huge inertial masses. When, they do so, they create an energy, that sun will make in it's whole lifetime and this energy will be dependent on the type of merge.
If two black holes orbit each other, their orbit can decay due to emission of gravitational waves. Eventually, the two black holes come close enough to "plunge" and form one larger black hole. The gravitational wave signature of this process is one of the predictions of General Relativity which may be tested in the next two decades.
For stellar mass black holes, these events are more likely to occur in the centers of globular clusters (where the more massive black holes will congregate due to mass segregation).
Supermassive black holes (which reside in the centers of galaxies) may capture lots of objects, some of which may be stellar mass black holes. When two galaxies merge, and each contains a supermassive black hole, the two black holes will sink towards the center of the merged galaxy and end up in orbit about each other. By three-body interactions, this orbit can lose enough energy for gravitational wave emission to become efficient in driving the system to merger. This process should occur once per galaxy merger.
The End Notes
Please share your views on the comment section of this website. So far, Black Hole-Black Hole mergers are purely theoretical: we have never observed black holes merging. This is easily understood for stellar mass binaries, since stellar mass Black Hole-Black Hole systems do not have matter to give us a luminous signal. The most promising way to detect a Black Hole-Black Hole merger is with gravitational waves, which may happen in the near future by second generation ground-based detectors such as Advanced LIGO and Advanced Virgo. Funding issues aside, we might some day see a space-based gravitational wave antenna similar to the LISA design.
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