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arXiv 2210.16752astro-ph.COgr-qc
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用星系尺度强透镜系统直接检验广义相对论的屏蔽效应

Direct tests of General Relativity under screening effect with galaxy-scale strong lensing systems

Yujie Lian, Shuo Cao, Tonghua Liu, Marek Biesiada, Zong-Hong Zhu

摘要:

对星系尺度强引力透镜(SGL)系统的观测,使得在星系和超星系尺度上对广义相对论(GR)的非线性偏离进行独特的测试成为可能。这种检验的最重要的情况之一是对两个标量引力势之间的引力滑移的约束。在本文中,我们使用一个新编译的强引力透镜的样本来测试GR的有效性,侧重于相对于GR预测的透镜源的视位置的屏蔽效果。这是第一次同时测量后牛顿(PN)参数($γ_{PN}$)和屏蔽半径($Λ$),而无需对宇宙的内容进行任何假设。我们的结果表明,尽管镜片型号的选择可能对最终测量结果产生显著影响,但随着筛选半径($Λ= 10-300 $ kpc)的增加,测量的PPN与GR($γ_{PN}=1$)略微一致。基于即将到来的LSST的5000个模拟强透镜的明确定义的样本,我们的方法将提供一个强的河外GR测试,精度为0.5%,评估高达$Λ\sim 300$ kpc的尺度。对于现有SGL系统的当前和未来观测,没有明显的证据表明在kpc-Mpc尺度上有一些特定的截止尺度,超过这些尺度,新的引力自由度被表达出来。

英文摘要:

Observations of galaxy-scale strong gravitational lensing (SGL) systems have enabled unique tests of nonlinear departures from general relativity (GR) on the galactic and supergalactic scales. One of the most important cases of such tests is constraints on the gravitational slip between two scalar gravitational potentials. In this paper, we use a newly compiled sample of strong gravitational lenses to test the validity of GR, focusing on the screening effects on the apparent positions of lensed sources relative to the GR predictions. This is the first simultaneous measurement of the Post-Newtonian (PN) parameter ($γ_{PN}$) and the screening radius ($Λ$) without any assumptions about the contents of the Universe. Our results suggest that the measured PPN is marginally consistent with GR ($γ_{PN}=1$) with increasing screening radius ($Λ= 10-300 $kpc), although the choice of lens models may have a significant influence on the final measurements. Based on a well-defined sample of 5000 simulated strong lenses from the forthcoming LSST, our methodology will provide a strong extragalactic test of GR with an accuracy of 0.5\%, assessed up to scales of $Λ\sim 300$ kpc. For the current and future observations of available SGL systems, there is no noticeable evidence indicating some specific cutoff scales on kpc-Mpc scales, beyond which new gravitational degrees of freedom are expressed.

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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