Buchdahl bound, photon ring, innermost stable circular orbit, and radial acceleration in Einstein-ether theory
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00638035" target="_blank" >RIV/68378271:_____/25:00638035 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/4y9j-wyrf" target="_blank" >https://doi.org/10.1103/4y9j-wyrf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/4y9j-wyrf" target="_blank" >10.1103/4y9j-wyrf</a>
Alternative languages
Result language
angličtina
Original language name
Buchdahl bound, photon ring, innermost stable circular orbit, and radial acceleration in Einstein-ether theory
Original language description
Spherically symmetric Einstein-æther (EÆ) theory with a Maxwell-like kinetic term is revisited. We consider a general choice of the metric and the æther 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 æther field to be timelike in the coordinate basis. We derive the vacuum solution and confirm that the innermost stable circular orbit and photon ring are enlarged relative to general relativity (GR). Buchdahl’s theorem in EÆ 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 EÆ radial acceleration relations run parallel in the low pressure limit. Our analysis of EÆ theory may offer novel insights into its interesting phenomenological generalization: Æther-scalar-tensor theory.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/EH22_010%2F0002906" target="_blank" >EH22_010/0002906: MSCA Fellowship CZ FZU I</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
111
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
124032
UT code for WoS article
001540420300013
EID of the result in the Scopus database
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