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The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.

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Why does $E=mc^2$ allow for the creation of particle-antiparticle pairs?

This is a line from Chapter 2 of Peskin: "We have no right to assume that any relativistic process can explained in terms of a single particle, since the Einstein relation $E = mc^2$ allows for the c …
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