The Casimir energy in terms of boundary quantum field theory: the QED case

Abstract

We revisit the path integral computation of the Casimir energy between two infinite parallel plates placed in a QED vacuum. We implement perfectly magnetic conductor boundary conditions (as a prelude to the dual superconductor picture of the QCD vacuum) via constraint fields and show how an effective gauge theory can be constructed for the constraint boundary fields, from which the Casimir energy can be simply computed, in perfect agreement with the usual more involved approaches. Gauge invariance is natural in this framework, as well as the generalization of the result to $d$ dimensions. We also pay attention to the case where the outside of the plates is not the vacuum, but a perfect magnetic (super)conductor, disallowing any dynamics outside the plates. We find perfect agreement between both setups.

arXiv comment18 pages, 1 figure. Comments added and relevant references included

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Cited by in corpus (5)

• The Casimir effect in chiral media using path integral techniques
• Interplay between chiral media and perfect electromagnetic conductor plates: repulsive vs. attractive Casimir force transitions
• Dynamical edge modes in Maxwell theory from a BRST perspective, with an application to the Casimir energy
• Effective model for pure Yang-Mills theory on ${\mathbb{T}}^2\times {\mathbb{R}}^2$ with Polyakov loops
• Path-integral approach to Casimir effect with infinitely thin plates