https://doi.org/10.1140/epjc/s10052-025-14285-9
Regular Article - Theoretical Physics
Polarized image of an equatorial emitting ring around a rotating braneworld black hole
1
School of Physics and Electronic Science, Hunan University of Science and Technology, 411021, Xiangtan, People’s Republic of China
2
Key Laboratory of Intelligent Sensors and Advanced Sensing Materials of Hunan Province, 411021, Xiangtan, People’s Republic of China
3
Department of Physics, Institute of Interdisciplinary Studies, Synergetic Innovation Center for Quantum Effects and Applications, 410081, Changsha, Hunan, People’s Republic of China
4
Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University, 225009, Yangzhou, People’s Republic of China
Received:
26
November
2024
Accepted:
7
May
2025
Published online:
16
May
2025
We have studied the polarized image of an equatorial emitting ring around a rotating braneworld black hole. This black hole possesses a tidal charge parameter b, which describes the effects of the free gravitational field in the bulk on the brane. Results show that the effects of the tidal charge parameter on the polarized image depend on the magnetic field structure, the observer inclination, the velocity of the fluid and the radii of the emitting ring. For a given value of the rotation parameter, the observed polarization intensity increases monotonously with b when the magnetic field lies in the equatorial plane, while it no longer changes monotonically with b when the magnetic field is perpendicular to the equatorial plane. The effect of parameter b on polarized images is similar in both stronger and weaker gravitational fields when the magnetic field is within the equatorial plane, and the differences in polarization vectors for different b become noticeable in stronger gravitational fields. We also probe the effects of b on the Stokes Q-U loops.
© The Author(s) 2025
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Funded by SCOAP3.
