Zero-Point Energy and the Lamb Shift

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Abstract
A suggestion by Feynman that the Lamb-shift energy can be obtained from the changes in zero-point energy due to the presence of the atoms involved is worked through in detail for the Bethe nonrelativistic contribution to the energy shift. The self energy of a free electron is obtained in the same way and is equivalent to the state independent shift due to the e2A2/2m2 term in the normal perturbation methods.

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