用双透镜微引力透镜事件检验广义相对论
Testing General Relativity with Binary Lens Microlensing Events
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中文总结 AI 辅助
本研究提出利用双微引力透镜事件结合GRAVITY+设备，通过测量PPN参数γ来检验极弱场区域的广义相对论，基于ASASSN-22av模拟已获约23%精度，未来可提升至约3%。
中文摘要 AI 辅助
爱因斯坦的广义相对论（GR）在星系和太阳系尺度上已得到精确检验，但在极弱引力场（无量纲牛顿势Φ~10⁻⁸）中的约束仍很差。在本研究通讯中，我们提出一种探测这种引力弱场区域并测量单位质量产生的空间曲率的新方法。具体而言，双微引力透镜事件可作为实验室，通过结合从微引力透镜推断出的透镜质量（M_lens^GR）与从干涉天体测量确定的动力学质量（M_dyn），来测量参数化后牛顿（PPN）参数γ。此前，双透镜的天体测量跟踪因它们较暗的亮度和极小的角间距（通常为几毫角秒）而受阻。GRAVITY+的部署已缓解了这一限制，该设备将仪器的灵敏度和天体测量精度推向了前所未有的高度。基于对双微引力透镜事件ASASSN-22av的天体测量模拟，我们直接估计γ的精度约为23%。基于更多具有精确动力学/透镜质量测定的双微引力透镜事件，这种在极弱场区域对GR的检验可进一步提高到更高精度（约3%）。
英文摘要
Einstein's General Relativity (GR), which has been precisely tested on galaxy and solar system scales, is still poorly constrained in extremely weak gravitational fields (with dimensionless Newtonian potentials of $Φ\sim 10^{-8}$). In this Letter, we propose a new method to probe such a weak-field regime of gravity and measure the spatial curvature generated per unit mass. Specifically, binary microlensing events provide a laboratory to measure the parameterized post-Newtonian (PPN) parameter ($γ$), by combining the lensing mass ($M_{\rm lens}^{\rm GR}$) inferred from microlensing with the dynamical mass ($M_{\rm dyn}$) determined from interferometric astrometry. Astrometric tracking of binary lenses was previously hindered by their faintness and minuscule angular separations (typically a few milliarcseconds). This limitation has been alleviated by the deployment of GRAVITY+, which pushes the instrument's sensitivity and astrometric precision to unprecedented heights. Based on astrometric simulations of the binary microlensing event ASASSN-22av, we directly estimate $γ$ at the precision of ~23%. Such test of GR in the extremely weak-field regime can be further improved to much higher precision (~3%), based on more binary microlensing events with precise determination of the dynamical/lens mass.
发表机构
- Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学前沿天文与天体物理研究所）
- School of Physics and Astronomy, Beijing Normal University（北京师范大学物理学院）
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