Casimir Energy and Entropy in the Sphere--Sphere Geometry

Details Casimir Energy and Entropy in the Sphere--Sphere Geometry Casimir Energy and Entropy in the Sphere--Sphere Geometry

2011-04-28

arxiv.org/abs/1104.5447v2

Physics

Condensed Matter

Statistical Mechanics

9 pages, 7 figures

Scientific paper

We calculate the Casimir energy and entropy for two spheres described by the perfect metal model, plasma model, and Drude model in the large separation limit. We obtain nonmonotonic behavior of the Helmholtz free energy with separation and temperature for the perfect metal and plasma models, leading to parameter ranges with negative entropy, and also nonmonotonic behavior of the entropy with temperature and the separation between the spheres. This nonmonotonic behavior has not been found for Drude model. The appearance of this anomalous behavior of the entropy is discussed as well as its thermodynamic consequences.

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