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arXiv math-ph/9801204math-phmath.MP
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N维爱因斯坦真空方程的Lie对称性

Lie symmetries of Einstein's vacuum equations in N dimensions

Louis Marchildon

摘要:

我们研究了N维爱因斯坦真空方程的Lie对称性,其中包含一个宇宙学项。为此,我们首先写出对称生成向量场的第二次延拓,并计算它对爱因斯坦方程的作用。我们不是将所有独立偏导数的系数设为零(这涉及到爱因斯坦方程的非常复杂的替换),而是将爱因斯坦方程中没有出现的导数的系数设为零。这大大限制了生成向量场的对称系数。利用对称性生成元的李代数性质和一般坐标变换是爱因斯坦方程的对称性这一事实,我们就能够得到所有的李对称性。我们所使用的方法也可以应用于其他类型的方程。

英文摘要:

We investigate Lie symmetries of Einstein's vacuum equations in N dimensions, with a cosmological term. For this purpose, we first write down the second prolongation of the symmetry generating vector fields, and compute its action on Einstein's equations. Instead of setting to zero the coefficients of all independent partial derivatives (which involves a very complicated substitution of Einstein's equations), we set to zero the coefficients of derivatives that do not appear in Einstein's equations. This considerably constrains the coefficients of symmetry generating vector fields. Using the Lie algebra property of generators of symmetries and the fact that general coordinate transformations are symmetries of Einstein's equations, we are then able to obtain all the Lie symmetries. The method we have used can likely be applied to other types of equations.

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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