J 2021

Epicyclic oscillations of test particles near marginally stable circular orbits around charged Kiselev black holes

OVCHINNIKOV, Dmitriy, Muhammad Umar FAROOQ, Ibrar HUSSAIN, Ahmadjon ABDUJABBAROV, Bobomurat AHMEDOV et. al.

Basic information

Original name

Epicyclic oscillations of test particles near marginally stable circular orbits around charged Kiselev black holes

Authors

OVCHINNIKOV, Dmitriy (860 Uzbekistan, belonging to the institution), Muhammad Umar FAROOQ, Ibrar HUSSAIN, Ahmadjon ABDUJABBAROV, Bobomurat AHMEDOV (860 Uzbekistan) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)

Edition

Physical Review D, College Park (USA), American Physical Society, 2021, 2470-0010

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

RIV identification code

RIV/47813059:19630/21:A0000105

Organization unit

Institute of physics in Opava

UT WoS

000699731100009

Keywords in English

QUASI-PERIODIC OSCILLATIONS;REISSNER-NORDSTROM-ANTI;COSMOLOGICAL CONSTANT;QUINTESSENCE;SCHWARZSCHILD;MOTION;MODEL;ACCRETION;DYNAMICS;LIGHT

Tags

International impact, Reviewed

Links

GA19-03950S, research and development project.
Změněno: 7/2/2022 12:50, Mgr. Pavlína Jalůvková

Abstract

V originále

The marginally stable circular orbits (MSCOs) of test particles in the spacetime exterior to a charged Kiselev black hole are investigated for three characteristic values of the equation of state parameter omega(q), namely (i) omega(q) = -1/3, (ii) omega(q) = -1, and (iii) omega(q) = -2/3, and for different values of the normalization factor a and electric charge Q of the black hole. It is found that the presence of the quintessence field shifts outward the innermost stable circular orbits (ISCOs) around the Kiselev black hole, having the same charge parameter Q, as compared to the ISCOs around a Riessner-Nordstrom black hole, while the effect of the quintessence field on the outermost stable circular orbits (OSCOs) is just opposite to that on the ISCOs. Further, the radii of the photon circular orbits are also calculated for different ranges of the parameters a and Q. It is observed that the photon orbits are also shifted outward as the value of a increases. The radial and latitudinal epicyclic motion of test particles, which can be related to the quasiperiodic oscillations of test particles slightly above the MSCOs in the vicinity of the charged Kiselev black hole, is analyzed for the three different values of omega(q). It is seen that the azimuthal and latitudinal frequencies coincide, and the radial epicyclic frequency is different in dependence on the spacetime parameters. In the case of omega(q) = -1/3, the azimuthal and latitudinal frequencies depend on the radial position r of the particle, the charge Q, and the ass M of the black hole, and do not depend on the factor a. However, for omega(q) = -2/3 and omega(q) = -1, these two frequencies, along with the black hole parameters-i.e., M and Q and the radial position r-also depend on the factor a. The radial epicyclic frequency for all the values of.q depends on M, Q, r, and also on the normalization factor a. We also compare the epicyclic frequencies with that for an uncharged black hole. With the increase of electric charge, the ISCO becomes closer to the central object, and one can observe epicyclic frequencies closer to the central object, which makes the epicyclic frequencies larger. The ISCO gets larger as a increases, and thus the epicyclic frequencies can be observed away from the central object and would be smaller as compared to the case of a pure Riessner-Nordstrom black hole without quintessence. As the effect of the parameters Q and a on the OSCOs is just opposite to that on the ISCOs, the epicyclic frequencies near the OSCOs behave the other way around.