Test particle orbits around regular black holes in general relativity combined with nonlinear electrodynamics
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F20%3AA0000025" target="_blank" >RIV/47813059:19630/20:A0000025 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.101.104045" target="_blank" >https://journals.aps.org/prd/abstract/10.1103/PhysRevD.101.104045</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.101.104045" target="_blank" >10.1103/PhysRevD.101.104045</a>
Alternative languages
Result language
angličtina
Original language name
Test particle orbits around regular black holes in general relativity combined with nonlinear electrodynamics
Original language description
We provide detailed analysis of the curvature structure of the spacetime around regular black holes (RBHs) governed by general relativity (GR) combined with nonlinear electrodynamics (NED), characterized by electric charge Q, and degree of nonlinearity n. We consider special class of the backgrounds introduced by Toshmatov et al. [Phys. Rev. D 98, 028501 (2018)] that have proper Maxwell weak-field limit of the NED sector. We also study the motion of uncharged and charged particles in the RBH background. We determine shadows of such black holes (BHs) using the effective geometry governing motion of photons in the background of NED RBHs. The analysis of circular motion enables to determine innermost stable circular orbits (ISCO) and marginally bound orbits (MBO). We show that the radius of ISCO and MBO for neutral particles decreases as the parameters of the RBH Q and n increase for the fixed value of the BH mass. We demonstrate that for the electrically charged particles properties of the circular orbits strongly depend on their Coulomb interaction with the RBH charge. The dependence of the ISCO radius on the particle specific charge q and the RBH parameters is rather complex, but for the attractive Coulomb interaction there is a general feature (independent of n) giving a limiting value of the intensity of this interaction qQ(max) behind which no stable circular orbits are allowed around the RBH. Comparison of the RBH with Reissner-Nordstrom black holes (RNBH) shows that for the same electric charges of these backgrounds the location of the relevant orbits is at substantially smaller radii for the RBH, demonstrating thus a strong influence of the NED effects. The analysis of ISCO radius of test particles has shown that the charge of RBH Q can mimic the rotation parameter of Kerr BH up to the value a = 0.8M. We have also shown that the RN BH charge can mimic the rotation parameter up to a = 0.5M and the RBH charge up to Q = 0.2M. Applications from observational data to the parameters of the supermassive black holes (SMBHs) at the galactic center Messier 87 (M87) and Milky Way so called Sagittarius A* (Sgr A*) give the mimic value for the RBH charge parameter for the rotation parameter of M87 to be 10(3) Q approximate to 277.56(-1.26)(+3.82), while for Sgr A* there is 10(3) Q approximate to 187.33(-26.4)(+27.6). Moreover, it is shown that the RN BH charge cannot mimic the rotation parameter of the SMBH M87, however, it can mimic the spin parameter of Sgr A* at 10(3)Q(RN)/M = 828.71(-60.94)(+70.58).
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
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA19-03950S" target="_blank" >GA19-03950S: Testing strong gravity via black holes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
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
1550-7998
e-ISSN
1550-2368
Volume of the periodical
101
Issue of the periodical within the volume
10
Country of publishing house
US - UNITED STATES
Number of pages
22
Pages from-to
„104045-1“-„104045-22“
UT code for WoS article
000535454600013
EID of the result in the Scopus database
2-s2.0-85085974959