Collaborative Research: Cosmology with CHIME

合作研究：与 CHIME 的宇宙学

• 批准号: 2006911
• 负责人: Laura Newburgh
• 金额: $ 28.32万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2006911&HistoricalAwards=false
• 关键词: Collaborative; Research; Cosmology; CHIME

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) will help understand dark energy by mapping out the distribution of matter throughout the Universe. One of the greatest mysteries in science is that the expansion of the Universe is currently accelerating, implying that a mysterious dark energy permeates the Universe and pushes on it. The discovery of dark energy resulted in a Nobel Prize, but its nature is no clearer today than it was 20 years ago. In fact, more recent measurements have led to less certainty, with different measurements of exactly how fast the Universe is expanding. CHIME is a new radio telescope designed to measure distant galaxies through the radio emission of neutral hydrogen gas that resides within them. In order to measure the hydrogen emission, other bright radio signals from our own galaxy and other sources must be removed. This foreground removal requires a precise understanding of the CHIME instrument itself. This project will measure the instrument, improve nuisance radio emission removal, and combine the CHIME measurements with galaxy catalogues to make a measurement of dark energy. The program will also develop education-oriented radio receivers that will be used in STEM programs at MIT, WVU and Yale. Radio receivers for education have been developed through a partnership between WVU and the Green Bank Observatory to teach teachers the digital signal processing techniques necessary to build a digital spectrometer.Analysis will be undertaken that cross-correlates 21cm maps from CHIME with optical galaxy survey data from eBOSS to measure the large-scale structure (LSS) of the Universe. CHIME is designed to measure neutral hydrogen associated with galaxies at redshifts from 0.8 to 2.5, producing constraints on dark energy over a critical redshift range that is difficult to probe statistically with optical galaxy surveys alone. To make this measurement bright foreground emission from our own galaxy and extragalactic sources must be removed, which places stringent requirements on instrument calibration. In this program the researchers will attempt to measure the expansion history through: (i) improved instrument beam modelling, (ii) demonstrated foreground removal techniques, and (iii) the measurement of large-scale structure with 21cm emission in cross-correlation with eBOSS optical galaxies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

加拿大氢强度映射实验（Chime）将通过在整个宇宙中绘制物质的分布来帮助理解黑暗能量。 科学中最大的奥秘之一是宇宙的扩张目前正在加速，这意味着神秘的黑暗能量渗透到宇宙并推动它。 黑暗能源的发现导致了诺贝尔奖，但今天的性质比20年前的性质还不清。 实际上，最近的测量结果降低了确定性，其确切的测量确切测量宇宙的扩展速度的速度越快。 Chime是一种新的射电望远镜，旨在通过驻留在其中的中性氢气的无线电发射来测量遥远的星系。 为了测量氢排放，必须去除来自我们自己的星系和其他来源的其他明亮无线电信号。 这种前景拆除需要对核仪器本身的精确理解。 该项目将测量仪器，改善滋扰无线电排放的去除，并将循环测量与星系目录相结合，以对黑暗能量进行测量。 该计划还将开发以教育为导向的无线电接收器，这些接收器将用于MIT，WVU和耶鲁大学的STEM计划。通过WVU和绿色银行天文台之间的合作，已经开发了教育无线电接收器，以教师教师建立数字光谱仪所需的数字信号处理技术。将进行分析，即从Eboss的光学银河系调查数据中进行交叉相关的21厘米地图，以测量Eboss的大规模结构（LSS）。 Chime的设计目的是测量与红移在0.8到2.5处的星系相关的中性氢，在关键的红移范围内对暗能量产生约束，仅通过光学星系调查，很难在统计上探索。为了使我们的星系和外层面的来源从我们自己的星系中进行明亮的前景发射，必须删除仪器校准的严格要求。 在该计划中，研究人员将尝试通过：（i）改进的仪器束建模，（ii）展示了前景拆除技术，以及（iii）在与Eboss eboss的互相关时进行21厘米发射的大规模结构的测量，这些奖项通过NSF的法定宣传和范围的范围来表达，这表明了NSF的范围及其范围的构成，并构成了一定的支持。 标准。