Collaborative Research: The Physical Halo Model

合作研究：物理光环模型

• 批准号: 2206688
• 负责人: EDUARDO ROZO
• 金额: $ 28.4万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2206688&HistoricalAwards=false
• 关键词: Collaborative; Research; Physical; Halo; Model

Dark matter aggregates under its own gravity to form tightly bound clumps called dark matter “halos”. As these halos form, they pull atoms of regular matter into them, enabling the formation of the stars and galaxies we see today. For this reason, dark matter halos are the foundational building blocks for our understanding of how galaxies are distributed in the Universe. Over the past few years, a variety of works have demonstrated that our definitions of dark matter halos do not adequately capture their inner structure, compromising our ability to use a halo-based description of the Universe when interpreting astronomical survey data. A collaboration between scientists at the University of Arizona and the University of Maryland propose to address this deficiency by providing the first fully physically motivated definition of dark matter halos. Based on this, the team will then develop an accurate theoretical model for interpreting data from large galaxy surveys. The Principal Investigator at the University of Arizona will be an active participant in the Tucson Initiative for Minority Engagement in STEM Program, organizing workshops, seminars, and coordinating mentoring activities in the program. The Principal Investigator at the University of Maryland will develop a user-friendly web-interface for the code Colossus to allow for simple visualizations that can be adopted for use in introductory and non-major astronomy courses.This project proposes a radical redefinition of dark matter halos that will enable the construction of percent-level accurate halo models of large-scale structure. The model is built on the inherent dichotomy between particles orbiting a halo and those falling into the halo for the first time. The proposing team has demonstrated that the orbiting and infalling contributions to halo correlation functions roughly correspond to the one- and two-halo terms of the traditional halo model. However, the orbiting/infalling halo model framework is both mathematically simpler and significantly more accurate than the traditional halo model approach. The team will develop the proposed physical halo model framework based on the orbiting/infalling dichotomy. They will then construct halo catalogs based on this revised halo definition for a broad range of simulated cosmologies and redshifts, and use the resulting halo catalogs to calibrate the halo mass function, bias function, and various halo correlation functions. The code and halo catalogs produced by this work will be made publicly available.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.

暗物质在自身引力作用下聚集形成紧密结合的团块，称为暗物质“晕”。 当这些光环形成时，它们将常规物质的原子拉入其中，从而形成了我们今天看到的恒星和星系。因此，暗物质晕是我们理解星系在宇宙中如何分布的基础。在过去的几年里，各种各样的工作已经证明，我们对暗物质晕的定义并不能充分捕捉它们的内部结构，这损害了我们在解释天文调查数据时使用基于晕的宇宙描述的能力。亚利桑那大学和马里兰州大学的科学家合作提出，通过提供第一个完全物理动机的暗物质晕定义来解决这一缺陷。在此基础上，该团队将开发一个精确的理论模型，用于解释大型星系调查的数据。亚利桑那大学的首席研究员将积极参与图森少数民族参与STEM计划，组织研讨会，研讨会和协调该计划中的辅导活动。马里兰州大学的首席研究员将为Colossus代码开发一个用户友好的网络界面，以便进行简单的可视化，可用于入门和非专业天文学课程。该模型是建立在固有的二分法之间的粒子轨道晕和那些落入晕的第一次。提出的团队已经证明，轨道和下降的贡献晕相关函数大致对应于传统的晕模型的一个和两个晕项。然而，轨道/下落晕模型框架在数学上比传统晕模型方法更简单，而且精确得多。该小组将根据轨道运行/坠落二分法开发拟议的物理晕模型框架。然后，他们将根据这个修订的晕定义为广泛的模拟宇宙学和红移构建晕目录，并使用由此产生的晕目录来校准晕质量函数，偏差函数和各种晕相关函数。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。