Phantom black holes in f (R, T) gravity: From circular orbits to QPO tests
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F25%3A50022957" target="_blank" >RIV/62690094:18470/25:50022957 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.dark.2025.102110" target="_blank" >https://doi.org/10.1016/j.dark.2025.102110</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.dark.2025.102110" target="_blank" >10.1016/j.dark.2025.102110</a>
Alternative languages
Result language
angličtina
Original language name
Phantom black holes in f (R, T) gravity: From circular orbits to QPO tests
Original language description
Cosmological and astrophysical observations, combined with theoretical studies, may help us understand the nature of dark matter. In this work, we focus on the dynamics of particles around a black hole surrounded by exotic matter known as a phantom field, which exhibits anti-gravitating behavior within the framework of f (R, T) gravity. First, we investigate the spacetime properties of the black hole, particularly the black hole horizon, the effective gravitational mass of the spacetime, and scalar invariants such as the Ricci scalar, the square of the Ricci tensor, and the Kretschmann scalar. We also examine the circular motion of test particles, including innermost stable circular orbits (ISCOs), minimum circular orbits (MCOs), and marginally bound orbits (MBOs) taking into account interaction between the scalar field and particles as a fifth force. In the next step, we study particle oscillations near the black hole in the presence of the phantom field. We investigate the frequencies of Keplerian orbits and radial oscillations, and apply these findings to the twin-peaked quasiperiodic oscillations (QPOs) within the relativistic precession model. Finally, to obtain constraint values, we analyze the phantom field, equation of state and fifth interaction parameters, as well as the mass of phantom black holes in f (R, T) gravity, using QPOs observed in microquasars XTE J1550-564, GRO J1655-40, and GRS 1915 +105, as well as in galaxies M82-X1 and around the Milky Way, employing Markov Chain Monte Carlo (MCMC) analyses. Our results indicate that the obtained values of the phantom field and black hole parameters can explain the observed QPO frequencies in these objects, suggesting that this modified gravity theory may remain consistent with the observations.
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
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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
Physics of the Dark Universe
ISSN
2212-6864
e-ISSN
2212-6864
Volume of the periodical
50
Issue of the periodical within the volume
December
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
16
Pages from-to
"Article number: 102110"
UT code for WoS article
001598127100005
EID of the result in the Scopus database
2-s2.0-105019082192