Buchdahl bound, photon ring, innermost stable circular orbit, and radial acceleration in Einstein-ether theory

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Buchdahl bound, photon ring, innermost stable circular orbit, and radial acceleration in Einstein-ether theory

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Buchdahl bound, photon ring, innermost stable circular orbit, and radial acceleration in Einstein-ether theory

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/EH22_010%2F0002906" target="_blank" >EH22_010/0002906: MSCA Fellowship CZ FZU I</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Svazek periodika

111

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

124032

Kód UT WoS článku

001540420300013

EID výsledku v databázi Scopus

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