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Asymptotic Flatness and Global Quantities

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Part of the book series: Lecture Notes in Physics ((LNP,volume 846))

Abstract

After providing a definition of asymptotic flatness, we introduce the global quantities that one may associate to the spacetime or to each slice of the 3 + 1 foliation: the ADM mass, the ADM linear momentum, the total angular momentum, the Komar mass and the Komar angular momentum. For each of these quantities, we derive expressions in terms of the 3+1 objects and provide some concrete examples.

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Notes

  1. 1.

    See Sect. 4.2.1.

  2. 2.

    In index notation, \(-\overrightarrow{\user2{T}}(\user2{\it v})\) is the vector \({-T^\alpha}_{\mu} v^\mu.\)

  3. 3.

    Actually the first condition proposed by York, Eq. (90) of Ref. [3], is not exactly (8.46) but can be shown to be equivalent to it; see also Sec. V of Ref. [16].

  4. 4.

    The Killing equation follows immediately from Eq. (8.53) with the Lie derivative expressed via Eq. (2.92), along with \(\varvec\nabla\user2{g}=0.{}\)

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Gourgoulhon, É. (2012). Asymptotic Flatness and Global Quantities. In: 3+1 Formalism in General Relativity. Lecture Notes in Physics, vol 846. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24525-1_8

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  • DOI: https://doi.org/10.1007/978-3-642-24525-1_8

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