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arXiv 2001.01806gr-qc
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分布函数与Einstein-Hilbert引力的Action原理

Distributional Metrics and the Action Principle of Einstein-Hilbert Gravity

Albert Huber

摘要:

在这项工作中,一个子类的广义Kerr-Schild类的时空被指定,相对于它的里奇张量(无论位置的指数)证明是线性的所谓的轮廓函数的几何。考虑到Colombeau的广义函数的非线性理论,这个结果被扩展到适用于相关的一类分布Kerr-Schild几何,然后用于制定这些奇异时空的变分原理。更具体地说,在这方面,它表明,一个适当的正则化爱因斯坦-希尔伯特作用的变化可以执行,即使相应的广义克尔-Schild代表之一的度量包含一个广义δ函数,收敛在一个合适的限制,以δ分布。

英文摘要:

In this work, a subclass of the generalized Kerr-Schild class of spacetimes is specified, with respect to which the Ricci tensor (regardless of the position of indices) proves to be linear in the so-called profile function of the geometry. Considering Colombeau's nonlinear theory of generalized functions, this result is extended to apply to an associated class of distributional Kerr-Schild geometries, and then used to formulate a variational principle for these singular spacetimes. More specifically, it is shown in this regard that a variation of a suitably regularized Einstein-Hilbert action can be performed even if the metric of one of the corresponding generalized Kerr-Schild representatives contains a generalized delta function that converges in a suitable limit to a delta distribution.

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