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Killing vector fields and a homogeneous isotropic universe


V.A. Steklov Mathematical Institute, Russian Academy of Sciences, ul. Gubkina 8, Moscow, 119991, Russian Federation

Some basic theorems on Killing vector fields are reviewed. In particular, the topic of a constant curvature space is examined. A detailed proof is given for a theorem describing the most general form of the metric of a homogeneous isotropic space-time. Although this theorem can be considered commonly known, its complete proof is difficult to find in the literature. An example metric is presented which, while all its spatial cross sections correspond to constant curvature spaces, still is not homogeneous and isotropic as a whole. An equivalent definition of a homogeneous isotropic space-time in terms of embedded manifolds is also given.

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Fulltext is also available at DOI: 10.3367/UFNe.2016.05.037808
Keywords: Killing vector field, homogeneous universe, isotropic universe, Friedmann metric
PACS: 04.20.−q
DOI: 10.3367/UFNe.2016.05.037808
URL: https://ufn.ru/en/articles/2016/7/d/
000386357600004
2-s2.0-84991721633
2016PhyU...59..689K
Citation: Katanaev M O "Killing vector fields and a homogeneous isotropic universe" Phys. Usp. 59 689–700 (2016)
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Received: 4th, December 2015, 16th, May 2016

Оригинал: Катанаев М О «Векторные поля Киллинга и однородная и изотропная вселенная» УФН 186 763–775 (2016); DOI: 10.3367/UFNr.2016.05.037808

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