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arXiv 1107.0286hep-phhep-th
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非均匀磁场中的真空极化张量

Vacuum polarization tensor in inhomogeneous magnetic fields

Holger Gies, Lars Roessler

摘要:

我们发展了世界线数值方法,它结合弦启发与Monte-Carlo技术,用于计算标量QED的非均匀背景场中的真空极化张量。该算法精确地满足沃德恒等式,并在重整化量的水平上运行。我们使用该算法研究的第一次光在空间变化的磁场中的传播。而局部导数展开适用于与康普顿波长相比的小变化的极限,强烈变化的场的情况可以通过平均场的导数展开来近似。对于快速变化的磁场,真空磁折射率可以表现出非单调依赖于当地的场强。这种行为可以为量子真空的自聚焦特性提供自然限制。

英文摘要:

We develop worldline numerical methods, which combine string-inspired with Monte-Carlo techniques, for the computation of the vacuum polarization tensor in inhomogeneous background fields for scalar QED. The algorithm satisfies the Ward identity exactly and operates on the level of renormalized quantities. We use the algorithm to study for the first time light propagation in a spatially varying magnetic field. Whereas a local derivative expansion applies to the limit of small variations compared to the Compton wavelength, the case of a strongly varying field can be approximated by a derivative expansion for the averaged field. For rapidly varying fields, the vacuum-magnetic refractive indices can exhibit a non-monotonic dependence on the local field strength. This behavior can provide a natural limit on the self-focussing property of the quantum vacuum.

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