Whom actually do multipole moments belong to?
General Relativity and Quantum Cosmology
2022-03-16 v1
Abstract
Using an integral definition to calculate the relativistic multipole moments (RMM), and the ensuing generalized relativistic Gauss theorem, we prove that the evaluation of that volume integral in Erez-Rosen coordinates, leads to a specific link between the RMM and the source of the exterior space--time, provided we have a global static axisymmetric metric in that coordinate system for any Weyl exterior field. This result allows to establish a relationship between the RMM and certain volume integral expressions involving the material content of the source from its energy-momentum tensor as well as the interior metric. In particular the relativistic quadrupole moment for the Erez-Rosen space-time is obtained.
Keywords
Cite
@article{arxiv.2203.07719,
title = {Whom actually do multipole moments belong to?},
author = {J. L. Hernandez-Pastora},
journal= {arXiv preprint arXiv:2203.07719},
year = {2022}
}