GRAVITATIONAL LENSING OF SEN BLACK HOLES IN PLASMA MEDIUM
We investigate the optical properties of the spacetime surrounding a Sen black hole, focusing on the photon sphere and weak gravitational lensing. Our analysis reveals that the effective charge of the Sen black hole significantly influences these phenomena. Specifically, an increase in the effective charge leads to a contraction in the radius of the photon sphere. Additionally, the bending angle of light rays diminishes as the effective charge increases. Our study provides observational bounds on the effective charge based on these optical characteristics. Our findings offer new insights into the impact of effective charge and plasma on the observational signatures of Sen black holes
1. A. S. Eddington, Space, time and gravitation, an outline of the general relativity theory (1920).
2. F. W. Dyson, A. S. Eddington, and C. Davidson, Phil. Trans. R. Soc. 220, 291 (1920).
3. V. Perlick, Living Rev. Relativ. 7, 9 (2004).
4. K. S. Virbhadra, Phys. Rev. D 79, 083004 (2009), 0810.2109.
5. C. M. Will, Class. Quant. Grav. 32, 124001 (2015), 1409.7812.
6. R. A. Vanderveld and et al., Phys. Rev. D 85, 103518 (2012).
7. P. Schneider, J. Ehlers, and E. E. Falco, Gravitational Lenses (1992).
8. A. O. Petters, H. Levine, and J. Wambsganss, Singularity theory and gravitational lensing (2001).
9. K. S. Virbhadra and G. F. R. Ellis, Phys. Rev. D. 62, 084003 (2000).
10. V. Bozza, S. Capozziello, G. Iovane, and G. Scarpetta, Gen. Rel. Grav. 33, 1535 (2001).
11. M. Sereno, Mon. Not. Roy. Astron. Soc. 344, 942 (2003).
12. V. Perlick, Ray Optics, Fermat's Principle, and Applications to General Relativity, vol. 61 (2000).
13. O. Y. Tsupko and G. S. Bisnovatyi-Kogan, Grav. Cosmol. 15, 184 (2009).
14. G. S. Bisnovatyi-Kogan and O. Y. Tsupko, Mon. Not. R. Astron. Soc. 404, 1790 (2010).
Copyright (c) 2025 «ACTA NUUz»
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
.jpg)
1.png)
