It's almost impossible to find good information on anti-gravitons without getting pelted by a thousand geek-built websites on Star-Trek.It's frustrating when yer trying to figure something out.
We know that if you take an atom, and it's anti-equivalent, and combine them, they will annihilate each other. Their annihilation produces energy. This is great and all, but what happens when a graviton and an anti-graviton combine?
We would assume that the result would be energy, but as Einstein said, energy = mass. So essentially the annihilation would produce mass, but does that mean the anti-gravitons are being destroyed, leaving behind gravitons?
I probably need to poke at that some more, but any help would be appreciated! :-D