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arXiv 0806.3228gr-qchep-th
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引力场中的狄拉克粒子

Dirac particle in gravitational field

Milovan Vasilic, Marko Vojinovic

摘要:

从应力-能量和自旋张量的守恒定律出发,导出了外引力场中自旋零尺寸物体的经典动力学。由此得到的世界线方程不同于现有文献中的方程。特别是,狄拉克粒子的自旋不与背景曲率耦合。作为一致性的检验,考虑了自由狄拉克方程的波包解。所得到的方程显示,包括一个约束,涉及到它的轨道角动量的波包自旋。在零尺寸极限中,这两个对总角动量的贡献同时消失。

英文摘要:

Classical dynamics of spinning zero-size objects in an external gravitational field is derived from the conservation law of the stress-energy and spin tensors. The resulting world line equations differ from those in the existing literature. In particular, the spin of the Dirac particle does not couple to the background curvature. As a check of consistency, the wave packet solution of the free Dirac equation is considered. The resulting equations are shown to include a constraint that relates the wave packet spin to its orbital angular momentum. In the zero-size limit, both contributions to the total angular momentum disappear simultaneously.

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