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arXiv quant-ph/0406012quant-phhep-thphysics.atom-ph
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介质小球与介质壁间的Casimir力

Casimir Force between a Small Dielectric Sphere and a Dielectric Wall

V. Sopova, L. H. Ford

摘要:

讨论了小金属球与介质半空间之间存在卡西米尔斥力的可能性。我们处理的模型中,球体具有由德鲁德模型给出的介电函数,并且球体的半径与相应的等离子体波长相比是小的。半空间也由相同的模型描述,但具有不同的等离子体频率。我们发现,在延迟极限,力是准振荡的。这就导致了对稳定平衡点的预测,在该平衡点上,球体可以悬浮在地球的引力场中。这似乎导致了对该模型进行实验测试的可能性。有限温度对力的影响也进行了研究,并发现在室温下是相当小的。然而,在室温下,平衡点之间的热激活转变可能是显著的。

英文摘要:

The possibility of repulsive Casimir forces between small metal spheres and a dielectric half-space is discussed. We treat a model in which the spheres have a dielectric function given by the Drude model, and the radius of the sphere is small compared to the corresponding plasma wavelength. The half-space is also described by the same model, but with a different plasma frequency. We find that in the retarded limit, the force is quasi-oscillatory. This leads to the prediction of stable equilibrium points at which the sphere could levitate in the Earth's gravitational field. This seems to lead to the possibility of an experimental test of the model. The effects of finite temperature on the force are also studied, and found to be rather small at room temperature. However, thermally activated transitions between equilibrium points could be significant at room temperature.

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