HORNDESKI GRAVITATSIYASIDA PLAZMA MAVJUD HOLDA FOTON SFERASI
Keywords:
Horndeski gravitatsiyasi, qora tuynuk, foton sferasi, null geodezik, kuchli linzalanish, qora tuynuk soyasi.1. KirishAbstract
Ushbu tezisda Horndeski tipidagi modifikatsiyalangan gravitatsiya doirasida sferik-simmetrik qora tuynuk atrofida yorug‘lik nurlarining beqaror doiraviy orbitasi — foton sferasi tahlil qilinadi. Metrik funksiya Shvartschild hadiga qo‘shimcha ravishda a/r2a/r^{2}a/r2 ko‘rinishdagi “effektiv Horndeski parametri” bilan umumlashtiriladi. Foton sferasi radiusi uchun analitik formula chiqarilib, aaa parametrining ishorasi va miqdoriga bog‘liq ravishda foton sferasining siljishi muhokama qilinadi. Natijalar qora tuynuk soyasi va kuchli gravitatsion linzalanish kabi kuzatuvchan effektlarni Horndeski parametrlari orqali cheklash imkonini beradi.
References
B. P. Abbott and et al., Observation of Gravitational Waves from a Binary Black Hole Merger, Phys. Rev. Lett 116, 061102 (2016), arXiv:1602.03837 [gr-qc].
K. Akiyama et al. (Event Horizon Telescope), First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way, Astrophys. J. Lett. 930, L12 (2022), arXiv:2311.08680 [astro-ph.HE].
K. Akiyama et al. (Event Horizon Telescope), First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon, Astrophys. J. Lett. 910, L13 (2021), arXiv:2105.01173 [astro-ph.HE].
E. Babichev and C. Charmousis, Dressing a black hole with a time-dependent Galileon, Journal of High Energy Physics 2014, 106 (2014), arXiv:1312.3204 [gr-qc].
T. P. Sotiriou and S.-Y. Zhou, Black hole hair in generalized scalar-tensor gravity: An explicit example, Phys. Rev. D 90, 124063 (2014), arXiv:1408.1698 [gr-qc].
A. Anabalon, A. Cisterna, and J. Oliva, Asymptotically locally AdS and flat black holes in Horndeski theory, Phys. Rev. D 89, 084050 (2014), arXiv:1312.3597 [gr-qc].
J. Rayimbaev, K. F. Dialektopoulos, F. Sarikulov, and A. Abdujabbarov, Quasiperiodic oscillations around hairy black holes in Horndeski gravity, European Physical Journal C 83, 572 (2023), arXiv:2307.03019 [gr-qc].
O. Donmez, From low- to high-frequency QPOs around the non-rotating hairy Horndeski black hole: Microquasar GRS 1915+105, Journal of High Energy Astrophysics 45, 1 (2025), arXiv:2408.10102 [astro-ph.HE].
A. Ashraf, A. S. Alqahtani, F. Javed, P. Channuie, A. Cilli, A. Bouzenada, E. Güdekli, and M. Y. Malik, Orbital motion and QPOs testing around rotating Hairy black holes in Horndeski gravity, Physics of the Dark Universe 47, 101725 (2025).
