Strong gravitational lensing of a 4-dimensional Einstein–Gauss–Bonnet black hole in homogeneous plasma

2020/04/30 by Xing-Hua Jin, Yuan-Xing Gao, Dao-Jun Liu
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black hole (networking) #Gravitation #Gravitational lens #Gravitational lensing formalism #Laser-Plasma Interactions and Diagnostics #Photon sphere #Plasma #Pulsars and Gravitational Waves Research #Rotating black hole #Strong gravitational lensing #Weak gravitational lensing #gr-qc

paper · pdf · doi:10.1142/s0218271820500650

16 pages, 7 figures; v2: references added, words polished and some typos corrected; v3: version to appear in IJMPD

openalex created_date 2020/04/24 · openalex publication_date 2020/05/19 · arxiv created 2020/06/30 · arxiv updated 2020/08/26 · openalex updated_date 2026/08/05

Abstract

We investigate the strong gravitational lensing of spherically symmetric black holes in the novel Einstein–Gauss–Bonnet (EGB) gravity surrounded by unmagnetized plasma medium. The deflection angle in the strong deflection limit in EGB spacetime with homogeneous plasma is derived. We find that both the coupling constant [Formula: see text] in the novel EGB gravity and the presence of plasma can affect the radius of photon sphere, strong field limit coefficient and other lensing observables significantly, while plasma has little effect on the angular image separation and the relative magnifications as [Formula: see text] and [Formula: see text], respectively.

Citations

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Cited by

• Magnetic Reconnection and Energy Extraction from a Rotating Black Hole in a Four-dimensional Einstein-Gauss-Bonnet Gravity