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Particles, Volume 5, Issue 3
September 2022 - 14 articles
Cover Story: In the framework of General Relativity, the density of gravitational energy is not localizable; that is, it depends on the coordinate system, and then ambiguous definitions emerge. Then, gravitational energy–momentum density is described by a geometrical object, a pseudo-tensor, whose affine character and non-tensoriality are related to the non-localizability of the gravitational field. However, for isolated systems immersed in asymptotically flat spacetimes, the gravitational energy–momentum density can be safely defined. Starting from Noether's theorem, a gravitational energy–momentum pseudo-tensor for theories of gravity of any orders can be derived. Gravitational radiation can be the test bed for this approach, giving rise to new gravitational modes. View this paper
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Particles - ISSN 2571-712X