WiggleZ 暗能量巡天:利用重子声学振荡绘制距离-红移关系图
宇宙学与河外天体物理
2015-05-30 v1
摘要
我们展示了在 WiggleZ 暗能量巡天最终数据集的星系相关函数中,红移 z = 0.44、0.6 和 0.73 处的重子声学峰测量结果。我们将我们的相关函数与来自 6 度视场星系巡天和斯隆数字巡天的较低红移测量结果相结合,生成了一个堆叠巡天相关函数,其中重子声学峰检测相对于无峰零重子模型的统计显著性为 4.9 西格玛。我们将宇宙学模型拟合到这个包含六个距离-红移数据点的组合重子声学振荡(BAO)数据集,并将结果与对最新超新星(SNe)和宇宙微波背景(CMB)数据的类似拟合进行比较。当分别与 CMB 数据结合时,BAO 和 SNe 数据集产生了对暗能量状态方程 w 的一致测量结果,这为这两种距离探针的系统误差提供了强有力的检验。结合所有数据集,我们确定在平坦宇宙中 w = -1.03 +/- 0.08,与宇宙常数模型一致。假设暗能量是宇宙常数并改变空间曲率,我们发现 Omega_k = -0.004 +/- 0.006。
引用
@article{arxiv.1108.2635,
title = {The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations},
author = {Chris Blake and Eyal Kazin and Florian Beutler and Tamara Davis and David Parkinson and Sarah Brough and Matthew Colless and Carlos Contreras and Warrick Couch and Scott Croom and Darren Croton and Michael J. Drinkwater and Karl Forster and David Gilbank and Mike Gladders and Karl Glazebrook and Ben Jelliffe and Russell J. Jurek and I-hui Li and Barry Madore and Chris Martin and Kevin Pimbblet and Gregory Poole and Michael Pracy and Rob Sharp and Emily Wisnioski and David Woods and Ted Wyder and Howard Yee},
journal= {arXiv preprint arXiv:1108.2635},
year = {2015}
}
备注
20 pages, 18 figures, accepted for publication by MNRAS