detalle del documento
IDENTIFICACIÓN
oai:arXiv.org:2411.02550
Tema
General Relativity and Quantum Cos... Astrophysics - Astrophysics of Gal...Autor
Hsu, Yi-Hsiung Lasenby, Anthony Barker, Will Durakovic, Amel Hobson, MichaelCategoría
ciencias: astrofísica
Año
2024
fecha de cotización
13/11/2024
Palabras clave
e\ae{} theoryResumen
Spherically symmetric Einstein-{\ae}ther (E{\AE}) theory with a Maxwell-like kinetic term is revisited.
We consider a general choice of the metric and the \ae{}ther field, finding that:~(i) there is a gauge freedom allowing one always to use a diagonal metric; and~(ii) the nature of the Maxwell equation forces the \ae{}ther field to be time-like in the coordinate basis.
We derive the vacuum solution and confirm that the innermost stable circular orbit (ISCO) and photon ring are enlarged relative to general relativity (GR).
Buchdahl's theorem in E\AE{} theory is derived.
For a uniform physical density, we find that the upper bound on compactness is always lower than in GR.
Additionally, we observe that the Newtonian and E\AE{} radial acceleration relations run parallel in the low pressure limit.
Our analysis of E\AE{} theory may offer novel insights into its interesting phenomenological generalization: \AE{}ther--scalar--tensor theory ({\AE}ST).
;Comment: 15 pages, 4 figures
Hsu, Yi-Hsiung,Lasenby, Anthony,Barker, Will,Durakovic, Amel,Hobson, Michael, 2024, Buchdahl bound, photon ring, ISCO and radial acceleration in Einstein-\ae{}ther theory
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