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Abstract: It is shown that the violation of the positiveness of the entropy due to theCasimir-Lifshitz interaction claimed in several papers is an artifact relatedto an improper interpretation of the -Casimir entropy-, which actually is adifference of two positive terms. It is explained that at definite conditionthis -Casimir entropy- must be negative. A direct derivation of the lowtemperature behavior of the surface entropy of a metallic surface in conditionsof the anomalous skin effect is given and singular temperature dependency ofthis quantity is discussed. In conclusion a hydrodynamic example of the entropyof a liquid film is considered. It occurs that the entropy of a film of finitethickness and a liquid half-space behave differently at T tends to 0.

Autor: Lev P. Pitaevskii


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