Perturbing the Stable Accretion Disk in Kerr and 4D Einstein-Gauss-Bonnet Gravities:Comprehensive Analysis of Instabilities and Dynamics  

作　　者：Orhan Donmez 

机构地区：[1]College of Engineering and Technology,American University of the Middle East,Egaila 54200,Kuwait

出　　处：《Research in Astronomy and Astrophysics》2024年第8期1-19,共19页天文和天体物理学研究（英文版）

摘　　要：The study of a disturbed accretion disk holds great significance in the realm of astrophysics,as such events play a crucial role in revealing the nature of disk structure,the release of energy,and the generation of shock waves.Consequently,they can help explain the causes of X-ray emissions observed in black hole accretion disk systems.In this paper,we perturb the stable disk formed by spherical accretion around Kerr and Einstein-Gauss-Bonnet(EGB)black holes.This perturbation reveals one-and two-armed spiral shock waves around the black hole.We find a strong connection between these waves and the black hole spin parameter(a/M)and the EGB coupling constant(α).Specifically,we find that asαincreases in the negative direction,the dynamics of the disk and the waves become more chaotic.Additionally,we observe that the angular momentum of the perturbing matter significantly affects mass accretion and the oscillation of the arising shock waves.This allows us to observe changes in QPO frequencies,particularly,perturbations with angular momentum matching the observed C-type low-frequency QPOs of the GRS 1915+105 source.Thus,we conclude that the possibility of the occurrence of shock waves within the vicinity of GRS 1915+105 is substantial.

关 键 词：accretion-accretion disks-black hole physics-hydrodynamics-shock waves-X-rays binaries 

分 类 号：P131[天文地球—天体力学]