Weak gravitational lensing of black hole from T-duality in plasma

Abstract

In this study, we investigate the impact of a plasma environment on gravitational weak lensing around a black hole from the perspective of T-duality. Our results demonstrate that the deflection angle of light rays around the black hole is notably affected by the parameter l0, with an increase leading to a decrease in the deflection angle, while the effect of plasma on the deflection angle is the opposite. We also consider different types of plasma distributions, including uniform ωe=const, Singular Isothermal Sphere medium, and Non-Singular Isothermal gas sphere plasma. We have analyzed the total magnification of the image source due to gravitational weak lensing, taking into account the effect of parameter l0 related to T-duality in the presence of plasma around the black hole.