In this work, taking the QED effect into account, we investigate the shadows of the Kerr black holes immersed in uniform magnetic fields through the numerical backward ray-tracing method. We introduce a dimensionless parameter $Λ$ to characterize the strength of magnetic fields and studied the influence of magnetic fields on the Kerr black hole shadows for various spins of the black holes and inclination angles of the observers. In particular, we find that the photon "hairs" appear near the left edge of the shadow in the presence of magnetic fields. The photon hairs may be served as a signature of the magnetic fields. We notice that the photon hairs become more evident when the strength of magnetic fields or the spin of the black hole becomes larger. In addition, we study the deformation of the shadows by bringing in quantitative parameters that can describe the position and shape of the shadow edge.
Photon rings and shadows of Kerr black holes immersed in a swirling universe
Instituto de Física de São Carlos, Universidade de São Paulo（圣卡洛斯物理研究所，圣保罗大学）；Institut für Physik, Carl-von-Ossietzky Universität Oldenburg（奥尔登堡卡尔·冯·奥西茨基大学物理研究所）；Department of Mathematics, University College London（伦敦大学学院数学系）；Departamento de Matemática da Universidade de Aveiro and Center for Research and Development in Mathematics and Applications (CIDMA)（阿威罗大学数学系及数学与应用研发中心）
Dymnikova Black Hole Immersed in Perfect Fluid Dark Matter and a Cloud of Strings: Hawking Temperature, Dynamics and QPOs Analysis
The Assam Royal Global University（阿萨姆皇家全球大学）；New Uzbekistan University（新乌兹别克斯坦大学）；Institute of Fundamental and Applied Research, National Research University TIIAME（国立研究大学TIIAME基础与应用研究所）；University of Tashkent for Applied Sciences（塔什干应用科学大学）；Tashkent State Technical University（塔什干国立技术大学）；Echahid Cheikh Larbi Tebessi University（Echahid Cheikh Larbi Tebessi大学）；Khazar University（哈萨尔大学）
Shadows and lensing signatures of a rotating black hole in a Hernquist dark matter halo
Universidade Federal da Paraíba（帕拉伊巴联邦大学）；Universidade Federal de Campina Grande（坎皮纳格兰德联邦大学）；Khazar University（哈扎尔大学）；Jamia Millia Islamia（贾米亚米拉伊斯兰大学）；Damghan University（达姆甘大学）；Universidade Federal do Espírito Santo（圣埃斯皮里图联邦大学）
Black holes in general relativity coupled with NEDs surrounded by PFDM: thermodynamics, epicyclic oscillations, QPOs, and shadow
The Assam Royal Global University（阿萨姆皇家全球大学）；New Uzbekistan University（新乌兹别克斯坦大学）；Institute of Fundamental and Applied Research, National Research University TIIAME（基础与应用研究所，国立研究大学TIIAME）；University of Tashkent for Applied Sciences（塔什干应用科学大学）；Tashkent State Technical University（塔什干国立技术大学）
Modelling the Sgr A* Black Hole Immersed in a Dark Matter Spike
研究了银河系中心黑洞Sgr A * 附近的暗物质尖峰效应。我们的主要目标是调查目前和未来的天文观测的Sgr A * 是否可以检测到这样的DM尖峰的存在。首先，我们构造了一个静态球对称黑洞周围的时空度规，然后利用Newman-Janis-Azreg Aïnou算法将这个解推广到旋转黑洞。对于静态BH度规，我们使用的数据的S2星绕Sgr A * 确定和分析的两个自由参数的约束特征的密度和最内边界的DM晕周围的BH。此外，利用银河系中已有的DM尖峰密度$ρ_\text{sp}$和DM尖峰半径$R_\text{sp}$的观测数据，我们考虑了围绕Sgr A * BH的几何厚度的吸积盘模型，并证明了DM分布对BH阴影半径和像的影响在实际DM密度下是相当微弱的.仅当DM密度在BH附近为$ρ_\text{sp} \sim (10^{-19}-10^{-20})$ g/cm $^3$数量级时才变得显著。我们进一步分析了用无线电干涉测量法观察这种效应的可能性，用类似EHT的阵列模拟观察，发现在不久的将来不太可能检测到这种效应。
Observational properties of magnetized quantum Oppenheimer-Snyder black holes
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México（墨西哥国立自治大学核科学研究所）；Fesenkov Astrophysical Institute（费森可夫天体物理研究所）；Al-Farabi Kazakh National University（阿里-法拉比哈萨克国立大学）；Dipartimento di Fisica and ICRA, Università di Roma “La Sapienza”（罗马大学“智慧大学”物理系及ICRA中心）
Optical and thermodynamic properties of Kerr-Bertotti-Robinson black holes
California State University, Fresno（弗雷斯诺加州州立大学）；University of Hradec Králové（赫拉德茨克拉洛韦大学）；Khazar University（卡扎尔大学）；Nazarbayev University（纳扎尔巴耶夫大学）；National Taiwan University（台湾大学）；Arizona State University（亚利桑那州立大学）；University of Helsinki（赫尔辛基大学）；Università di Camerino（卡梅里诺大学）；University at Albany-SUNY（奥尔巴尼纽约州立大学）；INAF - Osservatorio Astronomico di Brera（意大利国家天体物理研究所-布雷拉天文台）；Al-Farabi Kazakh National University（阿尔法拉比哈萨克国立大学）；Center for Theoretical Physics, Khazar University（卡扎尔大学理论物理中心）
New analytical model of rotating black hole with dark matter halo: constraints from EHT observations and accretion disk
Harbin Institute of Technology（哈尔滨工业大学）；New Uzbekistan University（新乌兹别克斯坦大学）；Tashkent University of Applied Sciences（塔什干应用科学大学）；National Research University TIIAME（国家研究型大学TIIAME）；Zhejiang University of Technology（浙江工业大学）；Tashkent State Technical University（塔什干国立技术大学）；National University of Uzbekistan（乌兹别克斯坦国立大学）
