Theoretical Studies of Fluctuations in the Redshifted 21 cm Line

红移21厘米线波动的理论研究

• 批准号: 0506556
• 负责人: Matias Zaldarriaga
• 金额: $ 37.59万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0506556&HistoricalAwards=false
• 关键词: Theoretical; Studies; Fluctuations; Redshifted; 21

AST-0506556ZaldarriagaObservations of fluctuations induced by absorption and emission from high redshift neutral hydrogen in its 21 cm transition have the potential to provide a new and extremely powerful probe of cosmology. This project will predict this signal, to understand better the power of this approach, to select the optimal angular scales and frequency ranges, to determine the best statistics to use, and to quantify the effects of foregrounds. Studying the primordial seeds should constrain the physics responsible for the generation of those perturbations, providing a window into the earliest evolution of the Universe (the epoch of inflation). This might also have important implications for fundamental physics. Analytic and numerical models of the epoch of reionization will both explore parameter space and calibrate against detailed physics.This work is vitally important to experiments to detect and measure redshifted 21 cm emission, motivating optimal design and observing strategies. Broad dissemination of results and the engagement of students from under-represented groups will spread the benefits of this research, training the next generation of scientists in this emerging area of cosmology.

AST-0506556Zaldarriaga 对高红移中性氢在 21 厘米跃迁中吸收和发射引起的波动的观测有可能提供一种新的、极其强大的宇宙学探测。 该项目将预测该信号，以更好地了解该方法的威力，选择最佳角度尺度和频率范围，确定要使用的最佳统计数据，并量化前景的影响。 研究原始种子应该会限制产生这些扰动的物理学，为了解宇宙最早的演化（暴胀时代）提供一个窗口。 这也可能对基础物理学产生重要影响。 再电离时代的分析和数值模型将探索参数空间并根据详细物理进行校准。这项工作对于检测和测量红移 21 厘米发射的实验至关重要，可激发优化设计和观测策略。 结果的广泛传播和来自代表性不足群体的学生的参与将传播这项研究的好处，并在这个新兴的宇宙学领域培训下一代科学家。