As we know that photon is its own antiparticle so how can we confidently say this is true? Is there any theory that describes it?
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This is part of the standard model. But experimentally, two photons may collide to form an electron-positron pair.
Dr Xorile
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Due to the photon being electrically neutral, it can be said to be its own antiparticle, given that an antiparticle has the opposite charge as the original particle.
