Confrontation of Cosmological Models with Observations

宇宙学模型与观测的对抗

• 批准号: 9802787
• 负责人: Anatoly Klypin
• 金额: $ 16.59万
• 依托单位: New Mexico State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802787&HistoricalAwards=false
• 关键词: Confrontation; Cosmological; Models; Observations

AST 98-02787 Anatoly A. Klypin The PI is using the Adaptive Refinement Tree (ART) code to address two problems in cosmology: (1) the structure, dynamics and spatial distribution of dark matter halos, and (2) the physics of galaxy formation in different cosmological models. The dark matter halos represent intermediate, but very important link between cosmological models, which deal with global parameters of the Universe and observations (e.g., power spectra of galaxies, different statistics of velocities of galaxies, rotational velocities of dark matter dominated galaxies). Theoretical predictions are uncertain and inconsistent. There is no consensus regarding projiles in the central parts (slope of the cusps). The PI is carrying out extensive simulations that will resolve the issues and produce reliable results concerning structure and distribution of dark matter halos. Theoretical predictions of formation of galaxies are still in their infant stage. The PI is using realistic n-body + hydro simulations to test different physical mechanisms and assumptions in order to reduce those uncertainties. He is studying such effects as the star formation feedback, the subresolution physics, the multiphase medium and the metal enrichment. ***

AST98-02787 Anatoly A.Klypin PI使用自适应精化树(ART)代码来解决宇宙学中的两个问题：(1)暗物质晕的结构、动力学和空间分布；(2)在不同的宇宙学模型中星系形成的物理学。暗物质晕代表着宇宙模型之间的中间但非常重要的联系，宇宙模型涉及宇宙的全球参数和观测(例如，星系的功率谱、星系速度的不同统计、暗物质主导的星系的旋转速度)。理论预测是不确定和不一致的。对于中央部分(尖端的斜率)的突出部分，没有达成共识。PI正在进行广泛的模拟，以解决这些问题，并产生关于暗物质晕的结构和分布的可靠结果。星系形成的理论预测仍处于萌芽阶段。PI正在使用现实的n体+流体模拟来测试不同的物理机制和假设，以减少这些不确定性。他正在研究恒星形成反馈、亚分辨率物理、多相介质和金属富集化等效应。***