Collaborative Research: The Physical Halo Model

合作研究：物理光环模型

• 批准号: 2206690
• 负责人: Benedikt Diemer
• 金额: $ 34.65万
• 依托单位: University of Maryland, College Park
• 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=2206690&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“光晕”。当这些光晕形成时，它们会将普通物质的原子拉入其中，从而形成我们今天看到的恒星和星系。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，各种研究表明，我们对暗物质晕的定义并不能充分捕捉它们的内部结构，从而损害了我们理解星系的内部结构的能力。使用亚利桑那大学和马里兰大学的科学家在解释天文调查数据时基于光环的宇宙描述，提出通过提供第一个完全物理驱动的暗物质光环定义来解决这一缺陷。然后，该团队将开发一个准确的理论模型来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族裔参与 STEM 计划，组织研讨会、研讨会并协调指导活动。马里兰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，以实现简单的可视化，可用于入门和非主要天文学课程。该项目提出了一个激进的方案。重新定义暗物质晕，这将能够构建大规模结构的百分比级精确晕模型。该模型建立在围绕晕物质运行的粒子和首次落入晕物质的粒子之间固有的二分法之上。提出的团队已经证明，轨道和坠落对晕相关函数的贡献大致相当于传统晕模型的一晕和双晕项，但是，轨道/坠落晕模型框架在数学上更简单，而且精度明显更高。该团队将基于轨道/坠落二分法开发拟议的物理光环模型框架，然后根据此修订后的光环定义构建光环目录，以进行广泛的模拟。宇宙学和红移，并使用所得的光环目录来校准光环质量函数、偏差函数和各种光环相关函数。这项工作产生的代码和光环目录将公开。该奖项反映了 NSF 的法定使命，并已被授予。通过使用基金会的智力优点和更广泛的影响审查标准进行评估，认为值得支持。