### Abstract

We study the effect of a finite photon mass on the vacuum expectation value of the stress tensor for the electromagnetic field near a plane boundary between free space and a perfectly conducting medium. Nonzero vacuum energy contributions arise which diverge at the boundary surface. We compare and contrast the result with that for a real scalar field. We point out the possible existence of new nonminimal-coupling terms in the vector-field Lagrangian which break gauge invariance in the massless limit. In the case that such terms are included, the boundary effects may be measurable.

Original language | English (US) |
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Pages (from-to) | 1363-1369 |

Number of pages | 7 |

Journal | Physical Review D |

Volume | 31 |

Issue number | 6 |

DOIs | |

State | Published - Jan 1 1985 |

Externally published | Yes |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)

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## Cite this

Davies, P. C. W., & Toms, D. J. (1985). Boundary effects and the massless limit of the photon.

*Physical Review D*,*31*(6), 1363-1369. https://doi.org/10.1103/PhysRevD.31.1363