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superposition



By analogy with the "water in a river" example, a naive expectation would
be "non-superposition due to too high density of photons" rather than
"due to too high energy of individual photons". How should the wording
"high energy gamma rays" be interpreted below?
Ludwik Kowalski
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It should be pointed out explicitly that superposition breaks down
for the electromagnetic field also at sufficiently extreme limits.
That field, too, exhibits nonlinearity, and a consequence of that
is that high energy gamma rays cannot be seen from great distances
in the universe ....