| http://www.w3.org/ns/prov#value | - The problem is that mass, as well as energy, is conserved. (Suppose, for example, I have a pi0 of 135 MeV that decays into two photons of 67.5 MeV. The photons are massless by themselves, but together they still represent an invariant mass of 135 MeV.) But while there is negative energy (gravitational fields) there is no such thing as negative mass.
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