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arXiv 0807.0596gr-qchep-th
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Riemann-Cartan时空中的零尺寸物体

Zero-size objects in Riemann-Cartan spacetime

Milovan Vasilic, Marko Vojinovic

摘要:

利用应力-能量和自旋张量的守恒定律,研究了黎曼-嘉当几何中零尺寸大质量物体的运动。由此产生的世界线方程原来表现出一种新的自旋曲率耦合。特别是,狄拉克粒子的自旋不与背景曲率耦合。这是它的真正零尺寸的结果,它始终排除了轨道自由度。作为一致性检验,考虑了自由Dirac方程的波包解。结果表明,在零尺寸极限下,波包自旋和轨道角动量同时消失。

英文摘要:

We use the conservation law of the stress-energy and spin tensors to study the motion of massive zero-size objects in Riemann-Cartan geometry. The resultant world line equations turn out to exhibit a novel spin-curvature coupling. In particular, the spin of the Dirac particle does not couple to the background curvature. This is a consequence of its truly zero size which consistently rules out the orbital degrees of freedom. As a test of consistency, the wave packet solution of the free Dirac equation is considered. It is shown that the wave packet spin and orbital angular momentum disappear simultaneously in the zero-size limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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