Where does other energy go when matter and antimatter annihilate?

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A.T.
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A misleading description, aimed at the non questioning layman. Here some quotes:

We also knew that photons are affected by gravitational fields not because photons have mass, but because gravitational fields (in particular, strong gravitational fields) change the shape of space-time.
This is how all objects are affected by gravitation in General Relativity, not only photons. All free falling particles follow geodesics in curved space-time and experience the same coordinate acceleration, which is independent of their own mass.

The photons are responding to the curvature in space-time, not directly to the gravitational field.
A completely meaningless distinction. The geometry of space-time and gravitational field are the same thing in General Relativity.
 

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