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We (physicists) believe the reason is this: known symmetries and conservation laws. For example, the mutual annihilation of a proton and positron would remove $2\,e$ charge units from the Universe. This violates the conservation of charge principle, which can be seen to arise from the application of Noether's theorem to the global gauge symmetry of the ...

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The short answer to "are there anti-photons" is "yes", but the disappointment here is that anti-photons and photons are the same particles. Some particles are their own antiparticles, notably the force carriers like photons, the Z boson, and gluons, which mediate the electromagnetic force, the weak nuclear force, and the strong force, respectively. Particles ...

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If your question is how can antiparticles get close enough to annihilate, they are always oppositely charged (electron/positron, proton/antiproton, etc.) or both neutral (neutrino/antineutrino, neutron/antineutron, etc.) so there is at least no repulsion and maybe electrostatic attraction. This is in contrast to normal matter fusing, where all the nuclei ...

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Yes this is how proton cosmic rays are produced... quasars, supernovae, gamma rays bursts... also anti proton cosmic rays originate from proton anti proton creation in proton cosmic ray collision with nuclei in interstellar medium (otherwise anti protons cannot leave the vicinity of a matter dominated (as opposed to anti-matter) source)

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