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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?
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The vacuum energy your refering to here is the cosmological constant, called Lambda, and is one of the proposals to explain dark energy.. In General Relativity, it's basically shifting Einstiens original constant that he added to create a static universe to the stress-energy tensor on the other side of the equation. It has the property of producing negative pressure. Problem is, vacuum energy is a quantum effect and when you calculate its value, the result is something like 120 orders of magnitude to large.