Real-Time Cosmology: Using Extragalactic Proper Motions to Make Dynamical Cosmological Tests, to Measure Geometric Distances, and to Detect Primordial Gravitational Waves

实时宇宙学：利用河外自行进行动力学宇宙学测试、测量几何距离、探测原初引力波

• 批准号: 1411605
• 负责人: Jeremiah Darling
• 金额: $ 77.64万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1411605&HistoricalAwards=false
• 关键词: Real; Time; Cosmology; Using; Extragalactic

The goal of this program is to use very small motions of distant galaxies and quasars to test cosmology, measure geometric distances, and detect gravitational waves. Broader impacts of the work include training of undergraduate and graduate students. In addition, Dr. Darling will participate in Colorado's Fiske Planetarium live lecture series using the Science on a Sphere (SOS) exhibit that will enable communication of the broad ideas of cosmology, relativity, and other current research to the general public.The proper motion measurements will be obtained from geodetic monitoring, the Gaia mission, and original observations at radio frequencies using Very Long Baseline Interferometry (VLBI). They can provide cosmological tests that are nearly model-independent. This work can measure or constrain: (1) The real-time growth and recession of structures, providing mass and distance measurements, (2) Extragalactic parallax for a statistical sample and individual galaxies, thus providing geometric distances, (3) The primordial stochastic long-period gravitational wave background and (4) Cosmic shear, rotation, bulk motion, and local voids that may manifest as an apparent acceleration attributed to dark energy.

该计划的目标是利用遥远星系和类星体的微小运动来测试宇宙学，测量几何距离和探测引力波。这项工作的更广泛影响包括培训本科生和研究生。此外，Darling博士还将参加科罗拉多的Fiske Planetarium现场讲座系列，利用“球体上的科学”（SOS）展览，向公众介绍宇宙学、相对论和其他当前研究的广泛思想。自行测量将通过大地测量、盖亚使命任务和使用甚长基线干涉测量（VLBI）进行的无线电频率原始观测获得。 它们可以提供几乎与模型无关的宇宙学检验。这项工作可以衡量或约束：（1）结构的实时增长和衰退，提供质量和距离测量，（2）统计样本和单个星系的河外视差，从而提供几何距离，（3）原始随机长周期引力波背景和（4）宇宙剪切，旋转，整体运动，和局部空洞，可能表现为归因于暗能量的明显加速。