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Q&A Why is it forbidden for two photons to turn into one?

With Maxwell's equations being linear and superposition working, isn't there no mechanism (in free space) for photons to interact? (Well, there's gravity: https://en.wikipedia.org/wiki/Geon_(physic...

posted 1mo ago by Fred Wamsley‭

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#1: Initial revision by user avatar Fred Wamsley‭ · 2025-02-25T04:03:13Z (about 1 month ago) 
With Maxwell's equations being linear and superposition working, isn't there no mechanism (in free space) for photons to interact? (Well, there's gravity: https://en.wikipedia.org/wiki/Geon_(physics))