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The cutoff-dependence of the Casimir force within an inhomogeneous medium | | S. A. R. Horsley
; W. M. R. Simpson
; | | Date: |
21 Feb 2013 | | Abstract: | We consider the ground state energy of the electromagnetic field in a piston
geometry. In the idealised case, where the piston and the walls of the chamber
are taken as perfect mirrors, the Casimir pressure on the piston is finite and
independent of the small scale physics of the media that compose the mirrors;
the Casimir-energy of the system can be regularised and is cutoff-independent.
Yet we find that, when the body of the piston is filled with an inhomogeneous
dielectric medium, the Casimir energy is cutoff-dependent, and the value of the
pressure is thus inextricably dependent on the detailed behaviour of the mirror
and the medium at large wave-vectors. This result is inconsistent with recent
proposals for regularising Casimir forces in inhomogeneous media. | | Source: | arXiv, 1302.5390 | | Services: | Forum | Review | PDF | Favorites | |
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