Multiring images of thin accretion disk of a regular naked compact object

M Guerrero, GJ Olmo, D Rubiera-Garcia, DSC Gómez - Physical Review D, 2022 - APS
We discuss the importance of multiring images in the optical appearance of a horizonless
spherically symmetric compact object, when illuminated by an optically thin accretion disk …

Quasinormal modes-shadow correspondence for rotating regular black holes

D Pedrotti, S Vagnozzi - Physical Review D, 2024 - APS
Eikonal quasinormal modes (QNMs) of black holes (BHs) and parameters of null geodesics,
ultimately tied to the appearance of BHs to external observers, are known to be related, and …

Black holes with multiple photon spheres

G Guo, Y Lu, P Wang, H Wu, H Yang - Physical Review D, 2023 - APS
Recently, asymptotically flat black holes with multiple photon spheres have been discovered
and found to produce distinctive observational signatures. In this paper, we focus on …

Distinct topological configurations of equatorial timelike circular orbit for spherically symmetric (hairy) black holes

X Ye, SW Wei - Journal of Cosmology and Astroparticle Physics, 2023 - iopscience.iop.org
Topology is a promising approach toward to the light ring in a generic black hole
background, and equatorial timelike circular orbit in a stationary black hole background. In …

Scalarized Kerr-Newman black holes

G Guo, P Wang, H Wu, H Yang - Journal of High Energy Physics, 2023 - Springer
A bstract In this paper, we construct scalarized rotating black holes within the framework of
Einstein-Maxwell-scalar models. These models incorporate non-minimal couplings that can …

[HTML][HTML] QED and accretion flow models effect on optical appearance of Euler–Heisenberg black holes

XX Zeng, KJ He, GP Li, EW Liang, S Guo - The European Physical Journal …, 2022 - Springer
Taking the quantum electrodynamics (QED) effect into account, we investigate the
geometrical-optics appearance of the Euler–Heisenberg (EH) black hole (BH) under the …

Quasinormal modes of black holes in f (T) gravity

Y Zhao, X Ren, A Ilyas, EN Saridakis… - Journal of Cosmology …, 2022 - iopscience.iop.org
We calculate the quasinormal modes (QNM) frequencies of a test massless scalar field and
an electromagnetic field around static black holes in f (T) gravity. Focusing on quadratic f (T) …

Gravitational lensing by black holes with multiple photon spheres

G Guo, X Jiang, P Wang, H Wu - Physical Review D, 2022 - APS
We study gravitational lensing of light by hairy black holes, which, in a certain parameter
regime, can possess two photon spheres of different size outside the event horizon. In …

Influence of accretion disk on the optical appearance of the Kazakov-Solodukhin black hole

YX Huang, S Guo, YH Cui, QQ Jiang, K Lin - Physical Review D, 2023 - APS
The optical characteristics of the Kazakov-Solodukhin black hole (BH) surrounded by a thin
disk is investigated. By utilizing the ray-tracing method, we derive the direct and secondary …

Appearance of an infalling star in black holes with multiple photon spheres

Y Chen, G Guo, P Wang, H Wu, H Yang - Science China Physics …, 2022 - Springer
Photon spheres play a pivotal role in the imaging of luminous objects near black holes. In
this paper, we examine observational appearances of a star freely falling in hairy black …