Problems in Gravitation (Physics)

万有引力问题（物理学）

• 批准号: 8806567
• 负责人: Richard Matzner
• 金额: $ 83.4万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8806567&HistoricalAwards=false
• 关键词: Problems; Gravitation; Physics

Richard Matzner will investigate several interconnected fields having to do with theories of gravity and tests of those theories using manmade satellites. He will combine computer and analytical simulations to determine the utility of Earth satellites like LAGEOS or the proposed LAGEOS III in determining the post-Newtonian behavior of gravitational theories. Numerical studies will investigate cosmological and astrophysical phenomena, including cosmic strings, (the study of which requires large computational and graphics support) and cosmic inflation. The behavior of radiation (neutrinos) as a cooling medium in neutron stars with application to supernova evolution will be studied. Prediction of the behavior of the cosmic background radiation in inhomogeneous cosmologies will be carried out, as will theoretical studies of the nuclear abundances predicted in hot big bang cosmologies. Other theoretical work will include more study of inflation in cosmology, studies of gravitational wave propagation in cosmology and also near black holes, and different approaches (Regge calculus and computational field theory) to the study of gravitating systems.

理查德·马茨纳将研究与重力理论有关的几个相互关联的领域，并利用人造卫星对这些理论进行测试。他将结合计算机和分析模拟来确定像LAGEOS或LAGEOS III这样的地球卫星在确定引力理论的后牛顿行为方面的效用。数值研究将调查宇宙学和天体物理现象，包括宇宙弦（需要大量计算和图形支持）和宇宙膨胀。本文将研究辐射（中微子）作为中子星冷却介质的行为及其在超新星演化中的应用。对非均匀宇宙学中宇宙背景辐射行为的预测，以及对热大爆炸宇宙学中预测的核丰度的理论研究将被进行。其他的理论工作将包括更多的宇宙学中的暴胀研究，宇宙学和黑洞附近引力波传播的研究，以及研究引力系统的不同方法（雷格演算和计算场论）。