Abstract
The mass of a sphere of simmetry in the Lemaître universe is discussed using the Hawking–Hayward quasi-local energy and clarifying existing ambiguities. A covariantly conserved current introduced by Cahill and McVittie is shown to be a multiple of the Kodama energy current.
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Notes
By “sphere of symmetry” we mean a 2-dimensional surface which is an orbit of the isometry of the spacetime manifold describing spherical symmetry (of course, such orbits exist through any point of a spherically symmetric spacetime).
In retrospect, this is a good argument because there is little arguing on the physical mass of the Schwarzschild spacetime, and the choice proved to give the correct answer (see below).
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This work is supported by Bishop’s University and by the Natural Sciences and Engineering Research Council of Canada (NSERC).
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Faraoni, V. Lemaître model and cosmic mass. Gen Relativ Gravit 47, 84 (2015). https://doi.org/10.1007/s10714-015-1926-0
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DOI: https://doi.org/10.1007/s10714-015-1926-0