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arXiv 1002.2846hep-thastro-ph.COgr-qcquant-ph
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de Sitter时空中平行平板的Casimir效应

Casimir effect for parallel plates in de Sitter spacetime

E. Elizalde, A. A. Saharian, T. A. Vardanyan

摘要:

在de Sitter时空背景下,对具有任意曲率耦合参数的两个无限平行板之间的大质量标量场,得到了Wightman函数、场平方和能量动量张量的真空期望值.场是在Bunch-Davies真空状态下制备的,并被约束为满足板上的Robin边界条件。对于计算,使用模式求和法,补充广义阿贝尔-普拉纳公式的变体。这允许明确地提取的贡献的期望值,来自每个单一的边界,并扩大第二板诱导的部分的指数收敛积分。然后研究了几种感兴趣的极限情况。此外,Casimir力作用在板上的评估,它表明,背景时空的曲率决定性地影响这些力的行为在分离大于德西特时空的曲率尺度。在曲率耦合参数和场的质量方面,实现了两个非常不同的区域,它们分别表现出真空期望值的单调和振荡行为。在大板分离的Casimir力的衰减被证明是幂律(单调或振荡),与场质量的值的独立性。

英文摘要:

The Wightman function and the vacuum expectation values of the field squared and of the energy-momentum tensor are obtained, for a massive scalar field with an arbitrary curvature coupling parameter, in the region between two infinite parallel plates, on the background of de Sitter spacetime. The field is prepared in the Bunch-Davies vacuum state and is constrained to satisfy Robin boundary conditions on the plates. For the calculation, a mode-summation method is used, supplemented with a variant of the generalized Abel-Plana formula. This allows to explicitly extract the contributions to the expectation values which come from each single boundary, and to expand the second-plate-induced part in terms of exponentially convergent integrals. Several limiting cases of interest are then studied. Moreover, the Casimir forces acting on the plates are evaluated, and it is shown that the curvature of the background spacetime decisively influences the behavior of these forces at separations larger than the curvature scale of de Sitter spacetime. In terms of the curvature coupling parameter and the mass of the field, two very different regimes are realized, which exhibit monotonic and oscillatory behavior of the vacuum expectation values, respectively. The decay of the Casimir force at large plate separation is shown to be power-law (monotonic or oscillating), with independence of the value of the field mass.

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