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arXiv quant-ph/0109134quant-ph
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电介质平面间的排斥Casimir力

Repulsive Casimir Force between Dielectric Planes

Karen Windmeier Wetz

摘要:

在1948年,H.B.G.Casimir预测,两个完美导电的中性板之间存在吸引力,这是由于板的影响引起的电磁真空能量的变化。1956年,E.M. Lifshitz推导出一个扩展的卡西米尔的表达适用于有限的温度和任意介电常数的两个半空间和间隙之间。在这份简短的报告中表明,虽然Lifshitz公式预测了两个半空间的介电常数相同的情况下的吸引力,但在某些情况下,当介电常数不相同时,会产生排斥力。排斥力的原因和可能的应用将被考虑。

英文摘要:

In 1948 H.B.G.Casimir predicted that an attractive force between two perfectly conducting neutral plates exists due to changes in the electromagnetic vacuum energy caused by the influence of the plates. In 1956 E.M. Lifshitz derived an extension of Casimir's expression applicable to finite temperatures and arbitrary dielectric constants for the two half-spaces and the gap in between them. It is shown in this brief report that, while the Lifshitz formula predicts an attractive force for the case of identical dielectric constants for the two half-spaces, a repulsive force results in some circumstances when the dielectric constants are not identical. The reason for the repulsive force and possible applications will be considered.

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