RUI: The Non-Linear Universe: Precision Numerical Cosmology and Fundamental Physics

RUI：非线性宇宙：精确数值宇宙学和基础物理学

• 批准号: 2013718
• 负责人: John Giblin
• 金额: $ 14.5万
• 依托单位: Kenyon College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2013718&HistoricalAwards=false
• 关键词: RUI; Non; Linear; Universe; Precision

This award funds the research activities of Associate Professor John T. Giblin, Jr. at Kenyon College.The Universe is a complex and constantly evolving system. Buried in this system are clues about physics at extreme conditions such as temperatures and energies beyond the capacity of terrestrial experiments. Our current understanding of the Universe includes a number of mysteries: dark matter, dark energy, and the physics that describes the very early Universe. Carefully studying this system is therefore one of the most promising avenues we have for extending our understanding of the nature of matter and energy. Professor Giblin and his students will study several foundational questions in fundamental physics. If there was a period of rapid expansion in the very early Universe, how do we describe it and how did it end? How should dark matter be described? Are there any hints that there are more particles in the Universe than we currently know? Professor Giblin will develop new, cutting-edge, computational tools that will permit the study of the evolution of the Universe with extreme accuracy. Six undergraduates will also participate in this work. This work is therefore in the national interest as it builds scientifically literate and numerically skillful human resources and deepens our understanding of basic science. Additionally, this research project includes outreach to high-school classrooms, thereby bringing new tools and new scientific topics to high-school students.Specifically, Professor Giblin will study realistic models of inflation and the observational signatures of nonlinear processes at the end of inflation in order to test and rule out inflationary scenarios through observations of the cosmic microwave background. He will also study the implications of measurements of gravitational-wave backgrounds and intergalactic magnetic fields. Professor Giblin will also study the Schrodinger description of non-relativistic dark matter as a possible description of ultra-light axion-like particles. Additionally, he will probe whether the introduction of Early Dark Energy --- extra degrees of freedom from beyond-the-standard-model physics --- can ease the so-called "Hubble-Lemaitre" tension.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.

该奖项资助凯尼恩学院副教授约翰·t·吉布林的研究活动。宇宙是一个复杂而不断演化的系统。在这个系统中，隐藏着一些关于极端条件下的物理学的线索，比如地球上无法进行实验的温度和能量。我们目前对宇宙的理解包括许多谜团：暗物质、暗能量和描述早期宇宙的物理学。因此，仔细研究这个系统是我们扩展对物质和能量本质理解的最有希望的途径之一。吉布林教授和他的学生将研究基础物理学中的几个基础问题。如果宇宙早期有一段快速膨胀的时期，我们如何描述它，它是如何结束的？暗物质应该如何描述？是否有迹象表明，宇宙中存在着比我们目前所知更多的粒子？吉布林教授将开发新的，尖端的，计算工具，这将允许以极高的精度研究宇宙的演化。6名本科生也将参与这项工作。因此，这项工作符合国家利益，因为它培养了具有科学素养和数字技能的人力资源，并加深了我们对基础科学的理解。此外，该研究项目还包括延伸到高中课堂，从而为高中生带来新的工具和新的科学主题。具体来说，吉布林教授将研究暴胀的现实模型和暴胀结束时非线性过程的观测特征，以便通过对宇宙微波背景的观测来测试和排除暴胀的可能性。他还将研究引力波背景和星系间磁场测量的含义。吉布林教授还将研究薛定谔对非相对论性暗物质的描述，作为对超轻类轴子粒子的可能描述。此外，他还将探索早期暗能量的引入——超出标准模型物理学的额外自由度——是否能缓解所谓的“哈勃-勒梅特”紧张关系。该奖项反映了美国国家科学基金会的法定使命，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。

项目成果

Constraining early dark energy with gravitational waves before recombination

• DOI: 10.1103/physrevd.103.l021301
• 发表时间: 2020-08
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Zachary J. Weiner;Peter Adshead;J. Giblin

What is flat ΛCDM, and may we choose it?

• DOI: 10.1088/1475-7516/2023/02/049
• 发表时间: 2022-07
• 期刊: Journal of Cosmology and Astroparticle Physics
• 影响因子: 6.4
• 作者: S. Anselmi;M. Carney;J. Giblin;Saurabh Kumar;J. Mertens;M. O'Dwyer;G. Starkman;C. Tian

Well-posed UV completion for simulating scalar Galileons

用于模拟标量伽利略的适定 UV 补全

• DOI: 10.1103/physrevd.106.043522
• 发表时间: 2022
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Gerhardinger, Mary;Giblin, John T.;Tolley, Andrew J.;Trodden, Mark
• 通讯作者: Trodden, Mark

Question of measuring spatial curvature in an inhomogeneous universe

• DOI: 10.1103/physrevd.103.083513
• 发表时间: 2020-10
• 期刊: arXiv: Cosmology and Nongalactic Astrophysics
• 作者: C. Tian;S. Anselmi;M. Carney;J. Giblin;J. Mertens;G. Starkman