On the entropy of a spherical plasma shell
On the entropy of a spherical plasma shell
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DOI：
10.1088/1751-8121/aae4c1
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发表时间：
2018-11-09
影响因子：
2.1
通讯作者：
Kirsten, K.
中科院分区：
文献类型：
--
作者：
Bordag, M.;Kirsten, K.
在Casimir效应中反复观察到由耗散或几何引起的负熵。然而，它仅限于子系统。最近，人们提出了一个关于类Casimir效应组态的熵的问题。在本文中，我们考虑一个球形等离子体壳层，它可以被认为是一个巨大的碳分子（如C-60）的（原油）模型。熵不受紫外发散的影响，其计算不需要任何正则化。我们计算的熵数值和明确地证明存在一个区域，它采取负值。该区域处于小的温度和等离子体频率值（以半径的倒数为单位）。
Negative entropy was repeatedly observed in the Casimir effect caused by dissipation or geometry. However, it was restricted to subsystems. Recently, the question about the entropy for a complete Casimir effect like configuration was raised. In the present paper we consider a spherical plasma shell which can be considered as a (crude) model for a giant carbon molecule (e.g. C-60). The entropy is free of ultraviolet divergences and its calculation does not need any regularization. We calculate the entropy numerically and demonstrate unambiguously the existence of a region where it takes negative values. This region is at small values of temperature and plasma frequency (in units of the inverse radius).