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arXiv 1302.2801hep-thastro-ph.COgr-qc
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反德西特时空中的费米Casimir密度

Fermionic Casimir densities in anti-de Sitter spacetime

E. Elizalde, S. D. Odintsov, A. A. Saharian

摘要:

研究了在反deSitter时空背景下,在两个平行边界几何和袋边界条件下,大质量费米子场的费米子凝聚和能量动量张量的真空期望值.利用广义Abel-Plana求和公式,将径向量子数本征值的真空期望值分解为无边界、单边界诱导和第二边界诱导三部分.这样,重整化过程就非常方便地简化为对应于无边界AdS时空的过程。边界诱导贡献的费米子凝聚和真空期望值的能量密度被证明是处处为负。真空期望值在距离边界远大于AdS空间的曲率半径处被指数抑制。在边界附近,与背景时空的曲率相关的影响被证明是次主导的,并导致秩序,所有已知的结果在闵可夫斯基散装边界恢复。Zeta函数技术被成功地用于边界之间的区域中的总真空能量的评估。它被证明,它们之间产生的相互作用力是有吸引力的,对于大的分离,它们也呈指数衰减。最后,我们的结果进行了扩展,并明确翻译到费米Casimir密度在膜世界的Randall-Sundrum类型的场景。

英文摘要:

The fermionic condensate and vacuum expectation value of the energy-momentum tensor, for a massive fermionic field on the background of anti-de Sitter spacetime, in the geometry of two parallel boundaries with bag boundary conditions, are investigated. Vacuum expectation values, expressed as series involving the eigenvalues of the radial quantum number, are neatly decomposed into boundary-free, single-boundary-induced, and second-boundary-induced parts, with the help of the generalized Abel-Plana summation formula. In this way, the renormalization procedure is very conveniently reduced to the one corresponding to boundary-free AdS spacetime. The boundary-induced contributions to the fermionic condensate and to the vacuum expectation value of the energy density are proven to be everywhere negative. The vacuum expectation values are exponentially suppressed at distances from the boundaries much larger than the curvature radius of the AdS space. Near the boundaries, effects related with the curvature of the background spacetime are shown to be subdominant and, to leading order, all known results for boundaries in the Minkowski bulk are recovered. Zeta function techniques are successfully used for the evaluation of the total vacuum energy in the region between the boundaries. It is proven that the resulting interaction forces between them are attractive and that, for large separations, they also decay exponentially. Finally, our results are extended and explicitly translated to fermionic Casimir densities in braneworld scenarios of Randall-Sundrum type.

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