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arXiv 0909.3068quant-phgr-qchep-ph
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利用邻近力近似从球-平面Casimir力实验导出短程类引力相互作用的极限

On the use of the proximity force approximation for deriving limits to short-range gravitational-like interactions from sphere-plane Casimir force experiments

Diego A. R. Dalvit, Roberto Onofrio

摘要:

我们讨论的邻近力近似的作用,在推导极限的存在Yukawian部队-预测在亚毫米范围内的许多统一模型-Casimir力实验使用的球-平面几何。这种近似的两种形式进行了讨论,第一种用于大多数分析的残余Casimir力的实验进行到目前为止,和第二个最近讨论在这方面的R。Decca等人[Phys.Rev.D79,124021(2009)]。我们表明,前形式的接近力近似高估了预期的汤川力,并从确切的汤川力的相对偏差是相同的数量级,在现实的实验设置中,作为预期的相对偏差之间的精确Casimir力和Casimir力的接近力近似评估。这意味着一个系统的转变,使汤川力的实际极限比迄今为止所声称的要弱,以及在α-λ平面上与处理卡西米尔和汤川力理论中使用的各种近似有关的不确定性。我们进一步认为,最近讨论的形式的邻近力近似是等价的,一个几何形状的一个通用的对象与一个无限的平面板相互作用,通常的精确积分的任何添加剂两体相互作用,而不需要调用任何近似方案。如果平板是有限的大小,一个额外的来源的系统误差出现由于打破了平面平移不变性的系统,我们最后讨论在何种程度上这可能会影响到幂律和汤川力的限制。

英文摘要:

We discuss the role of the proximity force approximation in deriving limits to the existence of Yukawian forces - predicted in the submillimeter range by many unification models - from Casimir force experiments using the sphere-plane geometry. Two forms of this approximation are discussed, the first used in most analyses of the residuals from the Casimir force experiments performed so far, and the second recently discussed in this context in R. Decca et al. [Phys. Rev. D 79, 124021 (2009)]. We show that the former form of the proximity force approximation overestimates the expected Yukawa force and that the relative deviation from the exact Yukawa force is of the same order of magnitude, in the realistic experimental settings, as the relative deviation expected between the exact Casimir force and the Casimir force evaluated in the proximity force approximation. This implies both a systematic shift making the actual limits to the Yukawa force weaker than claimed so far, and a degree of uncertainty in the alpha-lambda plane related to the handling of the various approximations used in the theory for both the Casimir and the Yukawa forces. We further argue that the recently discussed form for the proximity force approximation is equivalent, for a geometry made of a generic object interacting with an infinite planar slab, to the usual exact integration of any additive two-body interaction, without any need to invoke approximation schemes. If the planar slab is of finite size, an additional source of systematic error arises due to the breaking of the planar translational invariance of the system, and we finally discuss to what extent this may affect limits obtained on power-law and Yukawa forces.

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