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Clifford值微分形式与引力、电磁学和“统一”理论中的若干问题

Clifford Valued Differential Forms, and Some Issues in Gravitation, Electromagnetism and 'Unified' Theories

Waldyr A. Rodrigues, Edmundo Capelas de Oliveira

摘要:

本文给出了如何用Clifford值微分形式理论描述线性度量相容联络的一般理论。这是通过认识到对于每个时空点,Clifford双向量的李代数同构于Sl(2,C)的李代数来实现的。这样,在丛的局部平凡化下的线性连接的拉回(即,规范的选择)由Clifford值1-形式表示。这种观察使我们有可能立即认识到,爱因斯坦的引力理论可以用类似于Sl(2,C)规范理论的方式来表述。这样的理论与爱因斯坦理论的其他有趣的数学公式进行了比较。特别是M.萨克斯我们表明,他的识别麦克斯韦方程组在他的形式主义是不是一个有效的。利用本文介绍的数学方法,我们还研究了爱因斯坦引力理论中一个很有争议的问题,即能量动量守恒问题。我们发现,许多文献中出现的说法是混乱的,甚至是错误的。

英文摘要:

In this paper we show how to describe the general theory of a linear metric compatible connection with the theory of Clifford valued differential forms. This is done by realizing that for each spacetime point the Lie algebra of Clifford bivectors is isomorphic to the Lie algebra of Sl(2,C). In that way the pullback of the linear connection under a local trivialization of the bundle (i.e., a choice of gauge) is represented by a Clifford valued 1-form. That observation makes it possible to realize immediately that Einstein's gravitational theory can be formulated in a way which is similar to a Sl(2,C) gauge theory. Such a theory is compared with other interesting mathematical formulations of Einstein's theory. and particularly with a supposedly "unified" field theory of gravitation and electromagnetism proposed by M. Sachs. We show that his identification of Maxwell equations within his formalism is not a valid one. Also, taking profit of the mathematical methods introduced in the paper we investigate a very polemical issue in Einstein gravitational theory, namely the problem of the 'energy-momentum' conservation. We show that many statements appearing in the literature are confusing or even wrong.

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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