Revisiting the shadow of braneworld black holes

Abstract

We revisit the shadows of rotating braneworld black holes in the Randall-Sundrum type II model, by considering not only the metric in the near region of the black hole but also the linearized metric in the far region where the observer stays. Our study is significantly different from previous studies, which relies only on the metric in the near region. From the study, we identify a critical angle ${\theta }_c$ which decides the shadow curve is open or closed: the shadow curve would be open if the observational angle ${\theta }_c<{\theta }_o\le \pi /2$, and the curve becomes closed when $0<{\theta }_o\le {\theta }_c$. We study how various parameters affect the shape of the shadow curve. We furthermore apply our analysis to the data of M87* from the Event Horizon Telescope and obtain a new constraint on the parameters of the braneworld black holes.

22 pages, 13 figures

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• Shadows and parameter estimation of rotating quantum corrected black holes and constraints from EHT observation of M87* and Sgr A*
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• Onset of chaotic gravitational lensing in non-Kerr rotating black holes with quadrupole mass moment
• Image of a quantum-corrected black hole without Cauchy horizons illuminated by a static thin accretion disk
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• Shadow constraints of charged black hole with scalar hair and gravitational waves from extreme mass ratio inspirals
• QED Effects on Kerr Black Hole Shadows immersed in uniform magnetic fields
• Classification of radial Kerr geodesic motion
• Investigating the interplay of the braneworld gravity and the plasma environment on the black hole shadow