Quasiperiodic oscillations around hairy black holes in Horndeski gravity

Javlon Rayimbaev; Konstantinos F. Dialektopoulos; Furkat Sarikulov; Ahmadjon Abdujabbarov

doi:10.1140/epjc/s10052-023-11769-4

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 572
https://doi.org/10.1140/epjc/s10052-023-11769-4

Regular Article - Theoretical Physics

Quasiperiodic oscillations around hairy black holes in Horndeski gravity

Javlon Rayimbaev¹^,2^,3^,4^a, Konstantinos F. Dialektopoulos⁵^,6, Furkat Sarikulov⁷^,8^,9 and Ahmadjon Abdujabbarov³^,4^,8

¹ Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, 100000, Tashkent, Uzbekistan
² Akfa University, Milliy Bog Street 264, 111221, Tashkent, Uzbekistan
³ National University of Uzbekistan, 100174, Tashkent, Uzbekistan
⁴ Tashkent State Technical University, 100095, Tashkent, Uzbekistan
⁵ Department of Physics, Nazarbayev University, 53 Kabanbay Batyr Avenue, 010000, Astana, Kazakhstan
⁶ Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
⁷ School of Mathematics and Natural Sciences, New Uzbekistan University, Mustaqillik Ave. 54, 100007, Tashkent, Uzbekistan
⁸ Ulugh Beg Astronomical Institute, Astronomy str. 33, 100052, Tashkent, Uzbekistan
⁹ Inha University in Tashkent, Ziyolilar 9, 100170, Tashkent, Uzbekistan

^a javlonrayimbaev6@gmail.com

Received: 14 January 2023
Accepted: 26 June 2023
Published online: 6 July 2023

Abstract

Testing gravity theories and their parameters using observations is an important issue in relativistic astrophysics. In this context, we investigate the motion of test particles and their harmonic oscillations in the spacetime of non-rotating hairy black holes (BHs) in Hordeski gravity, together with astrophysical applications of quasiperiodic oscillations (QPOs). We show possible values of upper and lower frequencies of twin-peak QPOs which may occur in the orbits from innermost stable circular orbits to infinity for various values of the Horndeski parameter q in relativistic precession, warped disk models, and three different sub-models of the epicyclic resonant model. We also study the behaviour of the QPO orbits and their position relative to innermost stable circular orbits (ISCOs) with respect to different values of the parameter q. It is obtained that at a critical value of the Horndeski parameter ISCO radius takes 6M which has been in the pure Schwarzschild case. Finally, we obtain mass constraints of the central BH of microquasars GRS 1915+105 and XTE 1550-564 at the GR limit and the possible value of the Horndeski parameter in the frame of the above-mentioned QPO models. The analysis of orbits of twin peak QPOs with the ratio of upper and lower frequencies 3:2, around the BHs in the frame of relativistic precession (RP) and epicyclic resonance (ER4) QPO models have shown that the orbits locate close to the ISCO. It is obtained that the distance between QPO orbits and ISCO is less than the error of the observations.

© The Author(s) 2023

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