Casimir–Polder potential for a metallic cylinder in cosmic string spacetime
Casimir–Polder potential for a metallic cylinder in cosmic string spacetime
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DOI：
10.1016/j.physletb.2012.06.009
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发表时间：
2011-12
影响因子：
4.4
通讯作者：
A. Saharian;A. Kotanjyan
中科院分区：
文献类型：
--
作者：
A. Saharian;A. Kotanjyan
研究了具有金属圆柱壳的直宇宙弦中可极化微粒的Casimir-Polder势。电磁场绿色张量在虚频轴上计算。Casimir-Polder势的表达式推导出在一般情况下的各向异性极化的内部和外部区域的壳。势被分解为纯弦和壳诱导部分。后者在壳附近的点占主导地位，而纯弦部分在弦附近和离壳很远的地方占主导地位。对于各向同性的情况下，在壳内的区域中，Casimir-Polder力中的纯弦和壳诱导部分相对于弦是排斥的。在外部区域中，由壳引起的力的一部分指向圆柱体，而纯弦部分相对于弦保持排斥。在离壳很远的地方，总的力是排斥力。
Casimir–Polder potential is investigated for a polarizable microparticle in the geometry of a straight cosmic string with a metallic cylindrical shell. The electromagnetic field Green tensor is evaluated on the imaginary frequency axis. The expressions for the Casimir–Polder potential is derived in the general case of anisotropic polarizability for the both interior and exterior regions of the shell. The potential is decomposed into pure string and shell-induced parts. The latter dominates for points near the shell, whereas the pure string part is dominant near the string and at large distances from the shell. For the isotropic case and in the region inside the shell the both pure string and shell-induced parts in the Casimir–Polder force are repulsive with respect to the string. In the exterior region the shell-induced part of the force is directed toward the cylinder whereas the pure string part remains repulsive with respect to the string. At large distances from the shell the total force is repulsive.