Renormalization of the vector current in QED
Abstract
It is commonly asserted that the electromagnetic current is conserved and therefore is not renormalized. Within QED we show (a) that this statement is false, (b) how to obtain the renormalization of the current to all orders of perturbation theory, and (c) how to correctly define an electron number operator. The current mixes with the four-divergence of the electromagnetic field-strength tensor. The true electron number operator is the integral of the time component of the electron number density, but only when the current differs from the [overline MS]-renormalized current by a definite finite renormalization. This happens in such a way that Gauss's law holds: the charge operator is the surface integral of the electric field at infinity. The theorem extends naturally to any gauge theory.
Additional Information
©2006 The American Physical Society (Received 14 March 2006; published 31 May 2006) This work was supported in part by DOE Grants No. DE-FG02-90ER-40577, No. DE-FG03-97ER40546, and No. DE-FG03-92ER40701. We thank S. Adler, M. Neubert, J. Rabin, M. Srednicki, and M. Voloshin for comments on the first version of this paper.Files
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Additional details
- Eprint ID
- 3671
- Resolver ID
- CaltechAUTHORS:COLprd06.834
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2006-06-25Created from EPrint's datestamp field
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2022-10-05Created from EPrint's last_modified field