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arXiv 2502.06313gr-qcastro-ph.GA
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修改引力理论中暗致密天体的引力透镜效应及来自爱因斯坦环的观测约束

Gravitational Lensing by a Dark Compact Object in Modified Gravity and Observational Constraints from Einstein Rings

Nagina Rehman, Zoe C. S. Chan, Mubasher Jamil, Mustapha Azreg-Aïnou

AI总结:

本文研究了修改引力理论中暗致密天体的引力透镜效应,计算了特定MOG时空的弱、强偏折角,并以M87*和Sgr A*为透镜模型对比了强场参数并计算了弱场透镜系数与畸变参数。

摘要:

本文对基于标量-矢量-张量作用的修改引力理论(MOG)所预测的暗致密天体引力透镜效应进行了全面研究,旨在分析引力相互作用本质的新见解。我们计算了特定静态、球对称MOG时空的弱偏折角和强偏折角。此外,我们专门用一节探讨弱场极限下的观测意义。通过将超大质量星系黑洞作为引力透镜,我们在强场场景下将MOG中的各种参数与作为透镜的Schwarzschild黑洞参数进行了比较。具体而言,我们在MOG框架内将黑洞M87*和Sgr A*建模为透镜,计算了弱场区域中相应的透镜系数和畸变参数。

英文摘要:

In this manuscript, we provide a comprehensive study of gravitational lensing by dark compact objects predicted by a Modified Gravity (MOG) based on the Scalar-Vector-Tensor action, and the aim is to analyze new insights into the nature of gravitational interactions. We compute weak and strong deflection angles for the specified static, spherically symmetric MOG spacetime. Additionally, we dedicate a section to explore observational implications in the weak field limit. By employing a supermassive galactic black hole as a gravitational lens, we compare various parameters in MOG with those of the Schwarzschild black hole as lens in strong-field scenarios. Specifically, we model the black holes M87${^*}$ and Sgr A${^*}$ as lenses within the MOG framework, calculating the corresponding lensing coefficients and distortion parameters in the weak field regime.

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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