On exact analytical solution of Einstein-Maxwell-scalar field equations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F21%3AA0000141" target="_blank" >RIV/47813059:19630/21:A0000141 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2212686421000984?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2212686421000984?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.dark.2021.100868" target="_blank" >10.1016/j.dark.2021.100868</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On exact analytical solution of Einstein-Maxwell-scalar field equations

Popis výsledku v původním jazyce

The exact analytical solution of Einstein-Maxwell-scalar (EMS) field equations has been explored which covers several well-known solutions such as the Reissner-Nordstrom, Schwarzschild-MOG (Modified Gravity), Janis-Newman-Winicour, and Schwarzschild solutions. It has been assumed that the interactions between the tensor, vector, and scalar fields are negligible. The newly obtained solution is characterized by three free parameters as the total mass M, electric (magnetic) charge Q(e) (Q(m)), and scalar charge C (or n parameter) of the gravitational compact object. It is also shown that dual solution for the vector potential A(phi) = Q(m) cos theta is satisfied by the EMS field equations and the electric charge can be safely replaced by magnetic charge Q(m). Finally, we have studied curvature invariants and test particle motion around the gravitational source described the obtained new spacetime metric. We have also provided analysis of degeneracy values of spin parameter of the rotating Kerr black hole and charge parameter of compact object described by the new spacetime metric through comparison of radii of ISCO, photonsphere and energy efficiency. It is shown that new black hole solution in Einstein-Maxwell-scalar field theory can mimic spin parameter of the Kerr black hole up to a(*) less than or similar to 0.6 while the astrophysical black hole' observations that it reaches up to a(*) less than or similar to 0.99. Consequently, one may conclude that the obtained new black hole solution can be considered as realistic candidate for the astrophysical black holes with a(*) less than or similar to 0.6.

Název v anglickém jazyce

On exact analytical solution of Einstein-Maxwell-scalar field equations

Popis výsledku anglicky

The exact analytical solution of Einstein-Maxwell-scalar (EMS) field equations has been explored which covers several well-known solutions such as the Reissner-Nordstrom, Schwarzschild-MOG (Modified Gravity), Janis-Newman-Winicour, and Schwarzschild solutions. It has been assumed that the interactions between the tensor, vector, and scalar fields are negligible. The newly obtained solution is characterized by three free parameters as the total mass M, electric (magnetic) charge Q(e) (Q(m)), and scalar charge C (or n parameter) of the gravitational compact object. It is also shown that dual solution for the vector potential A(phi) = Q(m) cos theta is satisfied by the EMS field equations and the electric charge can be safely replaced by magnetic charge Q(m). Finally, we have studied curvature invariants and test particle motion around the gravitational source described the obtained new spacetime metric. We have also provided analysis of degeneracy values of spin parameter of the rotating Kerr black hole and charge parameter of compact object described by the new spacetime metric through comparison of radii of ISCO, photonsphere and energy efficiency. It is shown that new black hole solution in Einstein-Maxwell-scalar field theory can mimic spin parameter of the Kerr black hole up to a(*) less than or similar to 0.6 while the astrophysical black hole' observations that it reaches up to a(*) less than or similar to 0.99. Consequently, one may conclude that the obtained new black hole solution can be considered as realistic candidate for the astrophysical black holes with a(*) less than or similar to 0.6.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Physics of the Dark Universe

ISSN

2212-6864

e-ISSN

—

Svazek periodika

33

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

„100868-“-„100868-8“

Kód UT WoS článku

000704383100031

EID výsledku v databázi Scopus

2-s2.0-85112766314