用DESI解开宇宙的谜团
Unraveling the Universe with DESI
摘要：
暗能量光谱仪（DESI）是第四阶段的地面暗能量实验，计划于2020年开始运行。在本文中，我们对会议期间提出的DESI进行了简短回顾{ \it Recontres de Moriond 2018}。DESI将使用四种不同的示踪剂来绘制宇宙：星系的红移从0.05到1.7，类星体的红移从2.1到3.5。DESI将测量总共3500万个光谱，覆盖以前从未探索过的宇宙区域，提供大尺度结构图，这将使宇宙加速研究取得重大进展。DESI的关键科学目标是使用两个互补的观测量来约束暗能量和广义相对论的潜在偏差：重子声学振荡（BAO）和红移空间畸变（RSD）。其他的科学目标，如限制中微子质量和通货膨胀的总和，预计与基线项目。DESI安装于2018年2月开始，目前仪器的建设正在进行中。将用于确定目标的成像调查目前处于最后阶段，已完成80%，预计将于2018年底完成。DESI合作正在积极准备调查操作和科学分析，为2020年1月的第一次光做好准备。
英文摘要：
The Dark Energy Spectroscopic Instrument (DESI) is a stage IV ground-based dark energy experiment planned to begin operations in 2020. In this article, we provided a short review of DESI presented during the conference {\it Recontres de Moriond 2018}. DESI will use four different tracers for mapping the universe: from redshift 0.05 up to redshift 1.7 with galaxies and from 2.1 to 3.5 using quasars. DESI will measure a total of 35 million spectra covering regions of universe never explored before, providing a map of large scale structure that will enable major advances in the investigation of cosmic acceleration. The key science goals for DESI are to constrain dark energy and potential deviations of General Relativity using two complementary observables: the Baryonic Acoustic Oscillations (BAO) and the Redshift Space Distortions (RSD). Additional science goals, such as constraining the sum of neutrino masses and inflation, are expected with the baseline project. DESI installation started on February 2018 and the current construction of the instrument is on track. The imaging surveys that will serve to determine the targets are currently in the final stages, having achieved 80\% completion, and are expected to be finalized by the end of 2018. The DESI Collaboration is actively preparing for survey operations and science analysis, to be ready for the first light in January 2020.
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