Negativity of the Casimir Self-Entropy in Spherical Geometries.
Negativity of the Casimir Self-Entropy in Spherical Geometries.
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DOI:
10.3390/e23020214
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发表时间:
2021-02-10
期刊:
影响因子:
--
通讯作者:
Hong L
中科院分区:
文献类型:
--
作者:
Li Y;Milton KA;Parashar P;Hong L
It has been recognized for some time that, even for perfect conductors, the interaction Casimir entropy, due to quantum/thermal fluctuations, can be negative. This result was not considered problematic because it was thought that the self-entropies of the bodies would cancel this negative interaction entropy, yielding a total entropy that was positive. In fact, this cancellation seems not to occur. The positive self-entropy of a perfectly conducting sphere does indeed just cancel the negative interaction entropy of a system consisting of a perfectly conducting sphere and plate, but a model with weaker coupling in general possesses a regime where negative self-entropy appears. The physical meaning of this surprising result remains obscure. In this paper, we re-examine these issues, using improved physical and mathematical techniques, partly based on the Abel–Plana formula, and present numerical results for arbitrary temperatures and couplings, which exhibit the same remarkable features.
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