Are gravitons and black holes mutually exclusive concepts?
I don’t know that this is THE answer, but this is one possible answer. It is believed that black holes can create virtual particles, in pairs; just outside the Schwartzchild radius, from which nothing can escape. One particle or photon is swallowed and the other is emitted. That is the source of the Hawking radiation. I suppose that the black hole could cause pairs of gravitons, and the ones inside are undetectable to us. I agree that it doesn’t make much sense. But then, I suspect that it wasn’t intended to.
