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A paper by Colosi and Rovelli that I read may have another interesting answer to the question. Consider space partitioned off (arbitrarily) into two regions $R_1$ and $R_2$. The global Fock vacuum is found by solving for the global Hamiltonian which includes the possible correlations between the regions. A local detector in a region $R_1$ is governed by a ...

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A "left over waste product" is matter, too, and it must be composed of something, of some particles allowed by the laws of physics. So labeling something as "waste" doesn't really answer any question about the identity of dark matter. Moreover, most of antimatter has annihilated with the ordinary matter into photons. In fact, any product of the annihilation ...

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Don't think about annihilation as something exceptional. Annihilation is just a type of interaction and there are many other possible interactions. Now I don't use the word "interaction" in the sense of "4 fundamental interactions", but in the sense of possible process in the quantum world where particles are destroyed and created. So the question should ...

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Most of it would've become radiation- mostly photons and some neutrinos. Some of that can be seen in the cosmic microwave background. The rest would've gone into the kinetic energy of remaining matter particles (i.e., heat). We don't actually know what dark matter is made of, but we do know what the reaction products of matter/anti-matter annihilation are ...

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The word energy tends to be used in a rather vague way, and typically to mean something exotic. In the context of particle reactions energy either means photons or the kinetic energy of the particles leaving the reaction. For example an electron and anti-electron annihilate to produce two photons. By contrast the annihilation of a proton and anti-proton is ...

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The reaction of acids and bases to form water and salts is governed by electromagnetism: the transfer of charge carriers from one nucleus to another. Electromagnetism is invariant under $CP$, the transformation that changes particles into antiparticles. So the reaction of anti-acids and anti-bases to form anti-water and anti-salts would, to an excellent ...

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