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arXiv · 2211.03467

The tensorial representation of the distributional stress-energy quadrupole and its dynamics

Jonathan Gratus·Spyridon Talaganis
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Abstract

We investigate stress-energy tensors constructed from the covariant derivatives of delta functions on a worldline. Since covariant derivatives are used all the components transform as tensors. We derive the dynamical equations for the components, up to quadrupole order. The components do, however, depend in a non-tensorial way, on a choice of a vector along the worldline. We also derive a number of important results about general multipoles, including that their components are unique, and all multipoles can be written using covariant derivatives. We show how the components of a multipole are related to standard moments of a tensor field, by parallelly transporting that tensor field.

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Jonathan Gratus, Spyridon Talaganis. 2022-11-07. The tensorial representation of the distributional stress-energy quadrupole and its dynamics. https://doi.org/10.1088/1361-6382%2Facc163

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