标题： 等离子体存在下ESTGB黑洞的弱引力透镜效应 显示英文标题

标题： Weak gravitational lensing by an ESTGB black hole in the presence of a plasma

摘要： 本文致力于研究4D ESTGB黑洞在等离子体介质包围下的弱场引力透镜特性。详细研究了磁荷和三种等离子体分布模型对4D ESTGB黑洞周围光线偏折的影响。我们发现，与奇异等温球（SIS）、非奇异等温球（NSIS）模型相比，均匀等离子体导致光线的偏折更大。此外，随着磁荷绝对值的减小，偏折角略有增加。最后，我们分析了由于黑洞周围弱引力透镜效应导致的图像总放大率。结果表明，均匀等离子体介质显著增强了总放大率，而非均匀等离子体则降低了总放大率。 显示英文摘要

摘要： This paper is devoted to studying the weak-field gravitational lensing properties of a 4D ESTGB black hole, which is surrounded by the plasma medium. The effects of the magnetic charges and the three plasma distribution models in the deflection of light around a 4D ESTGB black hole are investigated in detail. We find that the uniform plasma leads to a larger deflection of light rays in comparison with the singular isothermal sphere (SIS), the non-singular isothermal sphere (NSIS) models. Moreover, the deflection angle increases slightly as the absolute value of the magnetic charge decreases. Finally, we analyze the total magnification of image due to weak gravitational lensing around the black hole. The result shows that the presence of a uniform plasma medium remarkably enhances the total magnification whereas the non-uniform plasma reduces the total magnification.