论文标题
新宇宙标尺的距离距离为0.1的距离尺寸
Sub-percentage measure of distances to redshift of 0.1 by a new cosmic ruler
论文作者
论文摘要
距离红移图探测宇宙的扩展历史。我们表明，我们先前研究中提出的星系的恒星质量结合能（MASSE）在宇宙尺度上提供了新的距离标尺。通过在Sloan数字天空调查数据版本7的主要星系样品中使用椭圆星系，我们使用MASSE统治者在0.05至0.2上构建了一个距离红移图。对于平坦的Lambda-CDM，最佳拟合的暗能量密度为0.675+-0.079，与其他探针一致。在中位红移为0.11时，估计中位距离的分数误差为0.34％，远低于Supernova（SN）IA和Baryonic声学振荡（BAO）的误差，甚至超过了此红移时的未来能力。上述低Z测量对于探测在晚期宇宙中占主导地位的暗能量很有用。对于状态模型的平坦暗能量方程（FLAT WCDM），单独的MASSE将W限制为仅比BAO，SN IA和宇宙微波背景（CMB）的误差仅为2.2、1.7和1.3倍。
Distance-redshift diagrams probe expansion history of the Universe. We show that the stellar mass-binding energy (massE) relation of galaxies proposed in our previous study offers a new distance ruler at cosmic scales. By using elliptical galaxies in the main galaxy sample of the Sloan Digital Sky Survey Data Release 7, we construct a distance-redshift diagram over the redshift range from 0.05 to 0.2 with the massE ruler. The best-fit dark energy density is 0.675+-0.079 for flat Lambda-CDM, consistent with those by other probes. At the median redshift of 0.11, the median distance is estimated to have a fractional error of 0.34%, much lower than those by supernova (SN) Ia and baryonic acoustic oscillation (BAO) and even exceeding their future capability at this redshift. The above low-z measurement is useful for probing dark energy that dominates at the late Universe. For a flat dark energy equation of state model (flat wCDM), the massE alone constrains w to an error that is only a factor of 2.2, 1.7 and 1.3 times larger than those by BAO, SN Ia, and cosmic microwave background (CMB), respectively.
