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arXiv 2602.09168gr-qcastro-ph.HEphysics.plasm-ph
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Schwarzschild黑洞在Dehnen型暗物质晕中的光学特征

Optical Signatures of a Schwarzschild Black Hole in a Dehnen-Type Dark Matter Halo

Institute of Fundamental and Applied Research, National Research University TIIAME(基础与应用研究所,国立研究大学TIIAME);National Pedagogical University of Uzbekistan named after Nizami(以尼扎米命名的乌兹别克斯坦国立师范大学);School of Advanced Sciences, Vellore Institute of Technology(韦洛尔技术学院高等科学学院);University of Tashkent for Applied Sciences(塔什干应用科学大学);Tashkent State Technical University(塔什干国立技术大学);School of Physics, Harbin Institute of Technology(哈尔滨工业大学物理学院);Institute for Advanced Studies, New Uzbekistan University(新乌兹别克斯坦大学高级研究院);Institute of Theoretical Physics, National University of Uzbekistan(乌兹别克斯坦国立大学理论物理研究所)

Javokhir Sharipov, Jonibek Khasanov, Pankaj Sheoran, Sanjar Shaymatov, Bobomurat Ahmedov

AI总结:

研究Schwarzschild黑洞在Dehnen型暗物质晕中的光学特征,通过弱场和强场 regime 分析偏转角、阴影和透镜效应,探讨等离子体与暗物质对观测信号的影响。

摘要:

本文探讨了接近Schwarzschild型黑洞(BH)及其Dehnen型(1,4,2)暗物质(DM)晕时发生的光学效应。我们首先推导出光球半径,并通过应用Gauss-Bonnet定理(GBT)在弱场 regime 中获得偏转角的解析表达式。在强场 regime 中,我们通过射线追踪计算来检查光轨迹的行为,并确定相应的轨道数目。我们进一步计算了在等离子体介质中的黑洞阴影和引力透镜效应,并提供了来自DM晕参数的约束。我们还扩展了我们的分析,考虑了等离子体环境中的弱引力透镜效应,考虑了均匀和奇异等温球(SIS)分布。我们找到了在等离子体存在下的偏转角的解析表达式,并检查了由此产生的对图像放大率的影响。总体结果突显了DM晕性质和等离子体特性如何共同改变可观测的透镜特征。

英文摘要:

In this paper, the optical effects that occur near a Schwarzschild-like black hole (BH) with a Dehnen-type $(1,4,2)$ dark matter (DM) halo are explored. We first derive the photon sphere radius and obtain an analytical expression for the deflection angle in the weak-field regime by applying the Gauss-Bonnet theorem (GBT). For the strong-field regime, we perform ray-tracing calculations to examine the behavior of light trajectories and determine the corresponding number of orbits. We further compute the BH shadow and gravitational lensing in a plasma medium and provide constraints arising from the DM halo parameters. We also extend our analysis to weak gravitational lensing within plasma environments, considering both uniform and singular isothermal sphere (SIS) distributions. We find the analytical expressions for the deflection angle in the presence of plasma and examine the resulting effects on image magnification. The overall results highlight how DM halo properties and plasma characteristics jointly alter observable lensing signatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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