论文标题
通过星系尺度强透镜系统在筛选效果下直接测试一般相对论
Direct tests of General Relativity under screening effect with galaxy-scale strong lensing systems
论文作者
论文摘要
星系尺度强力透镜（SGL）系统的观察结果使非线性偏离了银河系和超级阶级的一般相对论（GR）的独特测试。此类测试最重要的情况之一是对两个标量重力电位之间的重力滑移的限制。在本文中，我们使用新编制的强力透镜样本来测试GR的有效性，重点是筛选对镜头源相对于GR预测的明显位置的筛选效果。这是牛顿后（pn）参数（$γ_{pn} $）和筛选半径（$λ$）的第一个同时测量。我们的结果表明，测得的PPN与GR（$γ_{pn} = 1 $）略有一致，尽管筛选半径增加（$λ= 10-300 $ kpc），尽管镜头模型的选择可能对最终测量值有重大影响。基于即将到来的LSST的5000个模拟强镜的明确定义的样品，我们的方法将提供对GR的强层外测试，精度为0.5 \％，评估为$λ\ sim 300 $ kpc。对于当前和将来对可用SGL系统的观察结果，没有明显的证据表明KPC-MPC量表上有一些特定的截止量表，除此之外，还表达了新的引力自由度。
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.
