Quasinormal modes and shadow of Schwarzschild black holes embedded in a Dehnen-type dark matter halo exhibiting a cloud of strings  

作　　者：Ahmad Al-Badawi Sanjar Shaymatov 

机构地区：[1]Department of Physics,Al-Hussein Bin Talal University,PO Box 20,71111,Ma'an,Jordan [2]Institute for Theoretical Physics and Cosmology,Zhejiang University of Technology,Hangzhou 310023,China [3]Institute of Fundamental and Applied Research,National Research University TIIAME,Kori Niyoziy 39,Tashkent 100000,Uzbekistan [4]University of Tashkent for Applied Sciences,Str.Gavhar 1,Tashkent 100149,Uzbekistan Western Caspian University,Baku AZ1001,Azerbaijan

出　　处：《Communications in Theoretical Physics》2025年第3期101-111,共11页理论物理通讯(英文版)

基　　金：supported by the National Natural Science Foundation of China under Grant No.11675143;the National Key Research and Development Program of China under Grant No.2020YFC2201503。

摘　　要：In this paper we consider a static spherically symmetric black hole(BH)embedded in a Dehnen-(1,4,0)-type dark matter(DM)halo in the presence of a cloud string.We examine and present data on how the core density of the DM halo parameter and the cloud string parameter affect BH attributes such as quasinormal modes(QNMs)and shadow cast.To do this,we first look into the effective potential of perturbation equations for three types of perturbation fields with different spins:massless scalar field,electromagnetic field and gravitational field.Then,using the sixth-order Wentzel-Kramers-Brillouin approximation,we examine QNMs of the BH disturbed by the three fields and derive quasinormal frequencies.The changes in QNM versus the core density parameter and the cloud string parameter for three disturbances are explored.We also investigate how the core density and the cloud string parameter affect the photon sphere and shadow radius.Interestingly,the study shows that the influence of Dehnen-type DM and cloud strings increases both the photon sphere and the shadow radius.Finally,we employ observational data from Sgr A*and M87*to set limitations on the BH parameters.

关 键 词：SCHWARZSCHILD Dehnen type dark matter halo string cloud quasinormal modes SHADOW 

分 类 号：P14[天文地球—天体物理]