Optical properties of a braneworld black hole: Gravitational lensing and retrolensing
Ahmadjon AbdujabbarovDepartment of Physics, Center for Field Theory and Particle Physics, Fudan University, Shanghai 200433, ChinaBobomurat AhmedovUlugh Beg Astronomical Institute, Astronomicheskaya 33, Tashkent 100052, Uzbekistan, and National University of Uzbekistan, Tashkent 100174, Uzbekistan,Naresh DadhichInter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, IndiaFarruh AtamurotovInstitute of Nuclear Physics, Tashkent 100214, Uzbekistan, Ulugh Beg Astronomical Institute, Astronomicheskaya 33, Tashkent 100052, Uzbekistan and Inha University in Tashkent, Ziyolilar 9, Tashkent 100170, Uzbekistan
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Аннотация
In this paper, we study optical properties in terms of weak and strong (retrolensing) gravitational lensing around a black hole on the brane. The black hole is described by the Reissener-Nordstr\"om metric, where the electric charge is replaced by the Weyl tidal charge which acts in consonance with mass. It is, therefore, expected that gravitational lensing effects would be enhanced by the tidal charge, and that is what we verify. We also study the shadow of a braneworld black hole in plasma and show that the tidal charge increases the size of the black hole shadow. We finally consider energy emission from the hole by thermal radiation which is also increased due to tidal charge.
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