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arXiv 1001.2630hep-thquant-ph
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非零温下楔和柱的Casimir效应

Casimir effect at nonzero temperature for wedges and cylinders

Simen Å. Ellingsen, Iver Brevik, Kimball A. Milton

摘要:

本文考虑非零温度下圆柱体和由圆柱弧封闭的理想导电楔形体的Casimir Helmholtz自由能$T$,理想导电或等折射。在非零温度下的能量表达式可以正则化,以获得一个有限的值,除了在楔的情况下,这是目前也在零温度的奇异角项。假设圆柱体或楔形体内部的介质是非色散的,折射率为$n$,则温度依赖性仅通过无量纲参数$2πnaT$进入,$a$是圆柱体或圆柱弧的半径。我们明确地表明,已知的零温度的结果是恢复在极限$aT\to 0$和以前推导的高温渐近圆柱壳的准确再现。

英文摘要:

We consider the Casimir-Helmholtz free energy at nonzero temperature $T$ for a circular cylinder and perfectly conducting wedge closed by a cylindrical arc, either perfectly conducting or isorefractive. The energy expression at nonzero temperature may be regularized to obtain a finite value, except for a singular corner term in the case of the wedge which is present also at zero temperature. Assuming the medium in the interior of the cylinder or wedge be nondispersive with refractive index $n$, the temperature dependence enters only through the non-dimensional parameter $2πnaT$, $a$ being the radius of the cylinder or cylindrical arc. We show explicitly that the known zero temperature result is regained in the limit $aT\to 0$ and that previously derived high temperature asymptotics for the cylindrical shell are reproduced exactly.

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