New Cosmological Constraints from the Lyman-alpha Forest

来自莱曼阿尔法森林的新宇宙学约束

• 批准号: 1817256
• 负责人: Simeon Bird
• 金额: $ 45.77万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1817256&HistoricalAwards=false
• 关键词: New; Cosmological; Constraints; Lyman; alpha

The investigators will use intergalactic hydrogen maps to better understand how the Universe began. Hydrogen, the most common element in the Universe, is seen when backlit by bright objects. The observed maps of hydrogen across the sky yields important insights about how and why the Universe looks the way it does. This project will use new computer simulation techniques to better explain the observed hydrogen maps. These simulations will be made available widely to scientists and the general public. The simulations will also be shown in public talks and used to teach cosmology at UC Riverside. Additionally, this program will develop a hands-on workshop for K-12 students, compatible with the Next Generation Science Standards (NGSS), in both English and Spanish.This program will produce new constraints on cosmological parameters from the distribution of neutral hydrogen in the Universe. A suite of cosmological simulations will be performed, and a public likelihood function made available to the community. The investigators will prepare for the first major data release in 2021 by the Dark Energy Spectroscopic Instrument (DESI). Improved models will be implemented for gas temperature and for elements other than hydrogen. The program will constrain neutrino mass and models of inflation. The results will enable a variety of other work on extensions to the standard cosmological model. The astronomy workshops for K-12 students will include activities adopting a cognitive learning strategy, helping students to connect abstract concepts to concrete experiences.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.

研究人员将使用星系间氢地图来更好地了解宇宙是如何开始的。氢是宇宙中最常见的元素，在明亮的物体的背光下可以看到。观测到的横跨天空的氢气地图为宇宙是如何以及为什么看起来是这样的提供了重要的见解。该项目将使用新的计算机模拟技术来更好地解释观测到的氢图。这些模拟将向科学家和公众广泛提供。这些模拟还将在公开演讲中展示，并用于在加州大学河滨分校教授宇宙学。此外，该计划将为K-12学生开发一个实践工作坊，与下一代科学标准(NGSS)兼容，使用英语和西班牙语。该计划将根据中性氢在宇宙中的分布产生新的宇宙学参数限制。将进行一系列宇宙学模拟，并向社区提供公共似然函数。调查人员将为2021年暗能量光谱仪(DESI)首次发布重大数据做准备。将对气体温度和氢以外的元素实施改进的模型。该计划将限制中微子的质量和膨胀模型。这一结果将使标准宇宙学模型的各种扩展工作成为可能。针对K-12学生的天文工作坊将包括采用认知学习策略的活动，帮助学生将抽象概念与具体经验联系起来。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Bayesian emulator optimisation for cosmology: application to the Lyman-alpha forest

• DOI: 10.1088/1475-7516/2019/02/031
• 发表时间: 2018-12
• 期刊: Journal of Cosmology and Astroparticle Physics
• 影响因子: 6.4
• 作者: K. Rogers;H. Peiris;A. Pontzen;Simeon Bird;L. Verde;A. Font-Ribera

Multi-Fidelity Emulation for the Matter Power Spectrum using Gaussian Processes

使用高斯过程对物质功率谱进行多保真度仿真

• DOI: 10.1093/mnras/stab3114
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Ho, Ming-Feng;Bird, Simeon;Shelton, Christian R
• 通讯作者: Shelton, Christian R

Estimates for the impact of ultraviolet background fluctuations on galaxy clustering measurements

• DOI: 10.1093/mnras/stz741
• 发表时间: 2018-10
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Phoebe Upton Sanderbeck-Phoebe-Upton Sanderbeck-2124287587;V. Iršič;M. McQuinn;A. Meiksin

Effect of separate initial conditions on the lyman-α forest in simulations

模拟中不同初始条件对 lyman-α 森林的影响

• DOI: 10.1093/mnras/stab555
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Fernandez, M A;Bird, Simeon;Upton Sanderbeck, Phoebe
• 通讯作者: Upton Sanderbeck, Phoebe

Massive black hole mergers with orbital information: predictions from the ASTRID simulation

大规模黑洞合并与轨道信息：ASTRID 模拟的预测

• DOI: 10.1093/mnras/stac1432
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Chen, Nianyi;Ni, Yueying;Holgado, A. Miguel;Matteo, Tiziana Di;Tremmel, Michael;DeGraf, Colin;Bird, Simeon;Croft, Rupert;Feng, Yu
• 通讯作者: Feng, Yu