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arXiv 2210.02423gr-qc
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基于对称2-旋量的时空演算

A space-time calculus based on symmetric 2-spinors

Steffen Aksteiner, Thomas Bäckdahl

摘要:

在本文中,我们提出了一个时空演算的对称旋量,包括一个产品与一些指数收缩后的对称化。由于所有操作都在对称旋量类内,因此不需要涉及索引操作。事实上,旋量指标是不需要的形式主义。它也是普遍的,因为在四维洛伦兹时空中的任何协变张量表达式都可以转换成这种形式。作为xAct for Mathematica的一部分,还介绍了计算机代数实现SymSpin。

英文摘要:

In this paper we present a space-time calculus for symmetric spinors, including a product with a number of index contractions followed by symmetrization. As all operations stay within the class of symmetric spinors, no involved index manipulations are needed. In fact spinor indices are not needed in the formalism. It is also general because any covariant tensor expression in a 4-dimensional Lorentzian spacetime can be translated to this formalism. The computer algebra implementation SymSpin as part of xAct for Mathematica is also presented.

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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