Someone on EP today that wanted to know more about black holes posted a question asking such. Being a cosmology-nerd as well, I went on and started talking about a few of the existing theories, my own theories, and such. I’m sure this already exists as a theory (I know white holes do, but bear with me), but if, lets say, the graviton actually exists, then perhaps there exists an antigraviton, which would do exactly what it sounds like it would do. Antigravity on a very small scale would be pretty freaking awesome. I wondered how an anti-black-hole would behave next to matter. Assuming it doesn’t annihilate the matter, it’d cause it to fling away VERY fast. I thought about what would happen if this were to meet a black hole before, and I knew it’d release more than just a little bit of energy. I didn’t bother to actually calculate it before, though. But this guy asked me what would happen if the two beasts were to meet.
Of course I’m not going to NOT calculate something like this, especially when someone asked “what would happen if…” haha! I’m not sure if what I said was 100% right when it comes to the masses doubling or not, but it’s a scalar increase, and with such giant values, it doesn’t really matter when it comes to the point I was trying to make: it would be really, really, really energetic. The person seemed rather layman about the topic, so I didn’t want to talk about spins and such–the more quantum mechanical aspect of this. But the energy released would make a GRB seem like a camera flash…
Warning: Really Big Numbers lay ahead. Note, I told the guy that I was going to go to bed at 1AM because I could go on and on and on about black holes… AND LOOK WHAT HAPPENED…
If a black hole met a white hole, we’d literally destroy the entire universe due to the ENORMOUS amount of energy produced. It’s a fairly simple calculation. Let’s say both are equally massive, although cancel out each other. The white hole has negative mass. However, because of the way antiparticles and particles behave, it’s still effectively behaves as twice the mass. Theoretically speaking, they’ll simply cancel each other out and leave no mass behind whatsoever. HOWEVER. That mass has to go somewhere. Here’s where Einstein’s most famous equation comes in. Mass can be transformed into pure energy, and the amount of energy stored in a given amount of mass is that mass times the speed of light squared–of course, E=mc². The speed of light is approximately 300,000,000 meters per second, which in scientific notation is written as 3 x 10^8 meters per second, or in calculator shorthand, 3E8. Simple exponent math tells us that this squared is 3E16. A typical black hole has a mass of about 10^31kg, so our mass would be 2E31. So the energy released would be 2E31*3E16, which is 6E47 Joules of energy released all at once.
To put that in perspective, the most powerful explosion in the entire known universe is a gamma ray burst (GRB), only beaten by the Big Bang itself. These release 5E43 Joules of energy. In other words, this explosion would release the energy of about 10,000 GRB from the same place all at once.
To put that in another perspective, the Big Bang itself released E64 Joules of energy. In other words, the CREATION OF THE UNIVERSE ITSELF would only be about 100 quadrillion times the energy released in this one explosion, and, on a cosmological perspective, 100 quadrillion is puny. This is similar to nudging a small marble across the table and a ton of TNT. May seem much, but it’s really not.
Maybe it won’t obliterate the *entire* universe, but it’s certainly enough to destroy a HUGE chunk of it.
Oh, but I do speak only of a *typical* black hole mass. What about a supermassive black hole, like the one at the center of our galaxy? About E37 kg. So what’s E37*3E16? 3E53. Big Bang is only about 100 billion times as powerful.
… it’s 1:38AM. SEE THIS IS WHAT I MEAN THAT I CAN GO ON AND ON AND ON ABOUT BLACK HOLES!
Try and beat that explosion, Michael Bay!