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arXiv 0709.1072gr-qc
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Dirac本征旋量的全angular momentum

Total angular momentum from Dirac eigenspinors

Laszlo B. Szabados

摘要:

研究了闭类空2-曲面上由旋量丛上的两个联络构造的Dirac算子的本征值问题。一类发散自由向量场,从本征旋量,被发现,其中,对于最低的本征值,再现旋转Killing向量的度量球,并提供旋转BMS向量场在未来零无穷大。这使得在零无穷远处引入一个定义良好的、规范不变的空间角动量成为可能,它可以简化为稳态时空中的标准表达式。导出了引力辐射带走角动量通量的一般公式。

英文摘要:

The eigenvalue problem for Dirac operators, constructed from two connections on the spinor bundle over closed spacelike 2-surfaces, is investigated. A class of divergence free vector fields, built from the eigenspinors, are found, which, for the lowest eigenvalue, reproduce the rotation Killing vectors of metric spheres, and provide rotation BMS vector fields at future null infinity. This makes it possible to introduce a well defined, gauge invariant spatial angular momentum at null infinity, which reduces to the standard expression in stationary spacetimes. The general formula for the angular momentum flux carried away be the gravitational radiation is also derived.

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