EAPSI: Studying the first light in the early universe

EAPSI：研究早期宇宙中的第一道光

• 批准号: 1414657
• 负责人: Daegene Koh
• 金额: $ 0.51万
• 依托单位: Koh Daegene
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1414657&HistoricalAwards=false
• 关键词: EAPSI; Studying; first; light; early

When the first stars in the history of the universe were formed, they began to emit light, known as photons. It is believed that this light can be observed as a faint glow that is seen in every direction in the sky using infrared telescopes. Measuring this faint glow, referred to as the Cosmic Near-Infrared Background (NIRB), can be thought of as indirectly looking at the first sources of light. Professor Kyung-jin Ahn at Chosun University in Gwangju, South Korea, has recently run a high-resolution cosmological simulation that captures the formation of the first sources of light. Using these simulations, the connections between the properties of the first sources and their surroundings and the observed NIRB will be made. This research will study the correlation between the first sources of light and the NIRB. In studying this correlation, a better understanding about the history of the universe can be gained. Studying the universe will provide tests for physics that cannot be studied through experimentation on Earth, thereby leading to further advancements in human knowledge and technological developments.With this dataset, the resulting spectrum will be calculated, which can then be compared with the actual observations. Furthermore, because certain factors, such as star formation rates, the number of photons produced, and the initial mass function, are known in advance, precisely how these parameters manifest themselves in the NIRB can be understood. Putting a tighter limit on these parameters will also lead to a better understanding of a different astrophysical event, Cosmic Reionization, when the universe transformed from being filled with neutral hydrogen to a sea of ionized plasma. This NSF EAPSI award is funded in collaboration with the National Research Foundation of Korea.

当形成宇宙历史上的第一批恒星时，它们开始发出光，被称为光子。据信，可以将这种光视为使用红外望远镜在天空中的各个方向上看到的微弱光芒。测量这种淡淡的光芒，称为宇宙近红外背景（NIRB），可以间接地看着第一个光源。韩国Gwangju的Chosun University的Kyung-Jin Ahn教授最近进行了高分辨率的宇宙学模拟，该模拟捕获了第一批光的形成。使用这些模拟，将建立第一个来源及其周围环境的属性与观察到的NIRB之间的连接。这项研究将研究最初的光和NIRB之间的相关性。在研究这种相关性时，可以获得对宇宙历史的更好理解。研究宇宙将为无法通过地球实验研究的物理学提供测试，从而导致人类知识和技术发展的进一步进步。随着该数据集，将计算出所得的频谱，然后可以将其与实际观察结果进行比较。此外，由于某些因素（例如恒星形成速率，产生的光子数量和初始质量功能）是事先知道的，因此可以理解这些参数如何在NIRB中表现出来。当宇宙从充满中性氢填充到离子化等离子体的海洋时，对这些参数的限制也更加限制也将更好地理解不同的天体物理事件，即宇宙电离。该NSF EAPSI奖与韩国国家研究基金会合作。