标题： 利用双重光源平面强透镜限制暗能量状态方程 显示英文标题

标题： Constraining the dark energy equation of state with double source plane strong lenses

摘要： 我们研究了通过测量具有两个源平面的强引力透镜系统的爱因斯坦半径比来限制暗能量状态方程的可能性。 这个量独立于哈勃参数，并且直接测量了角直径距离随红移的增长。 我们研究了一个双源平面系统的前景，以及通过对重新观测已知单源透镜的群体（例如来自CASSOWARY的测光选择目录或SLACS的光谱选择目录）发现的系统集合的预测群体的前景。 我们发现，与当前的数据集相当的约束条件（暗能量状态方程在68%置信水平上的15%不确定性）可以通过少数几个双源平面系统实现。 我们还发现，该方法在Omega_M和w之间的退化几乎与CMB和BAO测量的正交，使此方法成为当前探针的高度互补工具。 显示英文摘要

摘要： We investigate the possibility of constraining the dark energy equation of state by measuring the ratio of Einstein radii in a strong gravitational lens system with two source planes. This quantity is independent of the Hubble parameter and directly measures the growth of angular diameter distances as a function of redshift. We investigate the prospects for a single double source plane system and for a forecast population of systems discovered by re-observing a population of single source lenses already known from a photometrically selected catalogue such as CASSOWARY or from a spectroscopically selected catalogue such as SLACS. We find that constraints comparable to current data-sets (15% uncertainty on the dark equation of state at 68%CL) are possible with a handful of double source plane systems. We also find that the method's degeneracy between Omega_M and w is almost orthogonal to that of CMB and BAO measurements, making this method highly complimentary to current probes.