How does matter/antimatter come into the picture I wonder? I ask this because (please correct me if I am wrong) Hawking radiation as theorised by Stephen Hawking is made when matter and antimatter seperating out of nothing with one of them being drawn into the black hole and the other escaping as radiation. Now if matter and antimatter can appear out of nothing at all, and then (usually) recombine almost as fast as it appears, then isn't a vacuum filled with the energy of this matter/antimatter?