TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.15.4.154
TI  - Gravitational multipoles in general stationary spacetimes
PY  - 2023/10/11
UR  - https://www.scipost.org/SciPostPhys.15.4.154
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 15
IS  - 4
SP  - 154
A1  - Mayerson, Daniel R.
AB  - The Geroch-Hansen and Thorne (ACMC) formalisms give rigorous and equivalent definitions for gravitational multipoles in stationary vacuum spacetimes. However, despite their ubiquitous use in gravitational physics, it has not been shown that these formalisms can be generalized to non-vacuum stationary solutions, except in a few special cases. This paper shows how the Geroch-Hansen formalism can be generalized to arbitrary non-vacuum stationary spacetimes for metrics that are sufficiently smooth at infinity. The key is the construction of an improved twist vector, which is well-defined under a mild topological condition on the spacetime (which is automatically satisfied for black holes). Ambiguities in the construction of this improved twist vector are discussed and fixed by imposing natural "gauge fixing" conditions, which also immediately lead to the equivalence between the Geroch-Hansen and Thorne formalisms for such arbitrary stationary spacetimes.
ER  -

@Article{10.21468/SciPostPhys.15.4.154,
	title={{Gravitational multipoles in general stationary spacetimes}},
	author={Daniel R. Mayerson},
	journal={SciPost Phys.},
	volume={15},
	pages={154},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.15.4.154},
	url={https://scipost.org/10.21468/SciPostPhys.15.4.154},
}