arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.05415gr-qc
收藏

电相互作用对强场极限下偏转和引力透镜的影响

Effect of electric interaction on the deflection and gravitational lensing in the strong field limit

Shangjie Zhou, Muchun Chen, Junji Jia

AI总结:

本文推广强场微扰法求解一般带电时空中带电信号的偏转角,并以 Reissner-Nordström 时空揭示电作用对临界轨道及透镜像、阴影和时延的影响。

摘要:

本文利用从中性信号情形推广而来的微扰方法,分析了强场极限下一般带电时空中带电信号的偏转角 $Δϕ$。所解出的 $Δϕ$ 自然包含有限距离效应,并呈现在首阶具有对数发散的准幂级数形式。该级数的系数同时包含引力和电学贡献。以 Reissner-Nordström 时空为例,我们发现电排斥(或吸引)倾向于减小(或增大)临界碰撞参数 $b_c$。如果排斥足够强,则 $b_c$ 可收缩至零,而临界粒子球 $r_{0c}$ 将消失。这些结果被应用于带电信号的引力透镜,由此我们求解了像的位置、放大率和时间延迟。研究发现,一般而言,电排斥(或吸引)会减小(或增大)像的视角、黑洞阴影尺寸及其放大率,但会增大(或减小)时间延迟。

英文摘要:

The deflection angle $Δϕ$ of charged signals in general charged spacetime in the strong field limit is analyzed in this work using a perturbative method generalized from the neutral signal case. The solved $Δϕ$ naturally contains the finite distance effect and takes a quasi-power series form with a logarithmic divergence at the leading order. The coefficients of the series contain both the gravitational and electric contributions. Using the Reissner-Nordström spacetime as an example, we found that an electric repulsion (or attraction) tends to decrease (or increase) the critical impact parameter $b_c$. If the repulsion is strong enough, then $b_c$ can shrink to zero and the critical particle sphere $r_{0c}$ will disappear. These results are applied to the gravitational lensing of charge signal, from which we solved the image positions, their magnifications and time delays. It is found that in general, the electric repulsion (or attraction) will decrease (or increase) the image apparent angles, the black hole shadow size as well as their magnifications but increase (or decrease) the time delay.

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。

↑