Authors: Steven Kenneth Kauffmann
Casimir's celebrated result that the conducting plates of an unpowered rectangular cavity attract each other with a pressure inversely proportional to the fourth power of their separation entails an unphysical unbounded pressure as the plate separation goes to zero. An unphysical result isn't surprising in light of Casimir's unphysical assumption of perfectly conducting plates that zero out electric fields regardless of their frequency, which he sought to counteract via a physically foundationless discarding of the pressure between the cavity plates when they are sufficiently widely separated. Casimir himself, however, emphasized that real metal plates are transparent to sufficiently high electromagnetic frequencies, which makes removal of the frequency cutoff that he inserted unjustifiable at any stage of his calculation. Therefore his physically groundless discarding of the large-separation pressure isn't even needed, and when it is left out a constant attractive pressure between cavity plates exists when their separation is substantially larger than the cutoff wavelength. The intact cutoff furthermore implies zero pressure between cavity plates when their separation is zero, and also that Casimir's pressure is merely the subsidiary lowest-order correction term to the constant attractive pressure between cavity plates that is dominant when their separation substantially exceeds the cutoff wavelength.
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