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arXiv 1206.4491hep-th
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外场作用下的QED:各向异性介质的哈密顿处理

QED with external field: Hamiltonian treatment for anisotropic medium formed by the Lorentz-non-invariant vacuum

Selym Villalba-Chavez, Anatoly E. Shabad

摘要:

非线性电动力学,QED,被认为是对洛伦兹非不变的外场背景下,作为各向异性介质。哈密顿形式主义适用于电磁激发的背景,和实体的电动力学的媒体,如场感应和强度,是有意义的正则变量。在相空间上定义了时空平移和旋转的守恒和非守恒生成元,建立了它们的哈密顿运动方程和Dirac括号关系,这与Poincaré代数不同.非对称的,但--作为回报--规范不变的,能量-动量张量暗示了一个不同于坡印廷矢量的正则动量密度。光子的磁矩被发现支配的光子角动量的演变。它由能量动量张量的反对称部分决定。

英文摘要:

Nonlinear electrodynamics, QED included, is considered against the Lorentz-noninvariant external field background, treated as an anisotropic medium. Hamiltonian formalism is applied to electromagnetic excitations over the background, and entities of electrodynamics of media, such as field inductions and intensities, are made sense of in terms of canonical variables. Both conserved and nonconserved generators of space-time translations and rotations are defined on the phase space, and their Hamiltonian equations of motion and Dirac bracket relations, different from the Poincaré algebra, are established. Nonsymmetric, but--in return--gauge-invariant, energy-momentum tensor suggests a canonical momentum density other than the Poynting vector. A photon magnetic moment is found to govern the evolution of the photon angular momentum. It is determined by the antisymmetric part of the energy-momentum tensor.

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