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arXiv 0711.4564hep-th
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D维Einstein静态宇宙中的标量Casimir效应

Scalar Casimir Effect on a D-dimensional Einstein Static Universe

Carlos A. R. Herdeiro, Raquel H. Ribeiro, Marco Sampaio

摘要:

我们计算了(n+1)维爱因斯坦静态宇宙(ESU)中耦合到引力的自由标量场的重整化能量动量张量RxS^n,其中任意低能有效算符(直到质量维n+1)。一个通用类的监管机构,连同阿贝尔-普拉纳公式,导致一个明显的监管独立的结果。的一般结构的分歧进行了分析,以表明所有的引力耦合(不只是宇宙学常数)是重整化的任意调节器。各种常用的方法(阻尼函数,点分裂,动量截止和zeta函数),有效地,属于给定的类。最终结果强烈依赖于n的奇偶性。一个详细的分析和数值分析进行的行为的重整化的能量密度和数量“西格玛”,它决定了强能量条件下举行的“量子流体”。我们简要地讨论了量子流体的反反应问题,通过高维弗里德曼和Raychaudhuri方程,观察到平衡半径的存在,并揭示了“卡西米尔稳定的爱因斯坦静态宇宙”的可能性。

英文摘要:

We compute the renormalised energy momentum tensor of a free scalar field coupled to gravity on an (n+1)-dimensional Einstein Static Universe (ESU), RxS^n, with arbitrary low energy effective operators (up to mass dimension n+1). A generic class of regulators is used, together with the Abel-Plana formula, leading to a manifestly regulator independent result. The general structure of the divergences is analysed to show that all the gravitational couplings (not just the cosmological constant) are renormalised for an arbitrary regulator. Various commonly used methods (damping function, point-splitting, momentum cut-off and zeta function) are shown to, effectively, belong to the given class. The final results depend strongly on the parity of n. A detailed analytical and numerical analysis is performed for the behaviours of the renormalised energy density and a quantity `sigma' which determines if the strong energy condition holds for the `quantum fluid'. We briefly discuss the quantum fluid back-reaction problem, via the higher dimensional Friedmann and Raychaudhuri equations, observe that equilibrium radii exist and unveil the possibility of a `Casimir stabilisation of Einstein Static Universes'.

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