RUI: Numerical Simulations of Neutron Stars, Black Holes and Gravitational Radiation

RUI：中子星、黑洞和引力辐射的数值模拟

• 批准号: 0139907
• 负责人: Thomas Baumgarte
• 金额: $ 14.95万
• 依托单位: Bowdoin College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0139907&HistoricalAwards=false
• 关键词: RUI; Numerical; Simulations; Neutron; Stars

Under this award, numerical tools will be developed for the study of astrophysical systems involving relativistic gravity, strong electromagnetic fields, and rotation. These tools will include computer codes for evolving fluids and electromagnetic fields in a fixed gravitational field, codes for evolving the relativistic gravitational field itself, and a combined code that will evolve gravitational fields with both material and electromagnetic sources. Tools for verifying the accuracy of the integrations will also be developed. The codes will be optimized for use on the latest generation of supercomputers, publicly released, and made available within the scientific community. In the course of developing these codes, computational scientistswill be trained at the undergraduate, graduate, and postdoctoral levels. The codes will also be applied by thedevelopers to problems at the forefront of astrophysics and gravitation physics research.This work is motivated by a number of astrophysical systems, including: accreting black holes and neutron stars; coalescing binary neutron stars and black holes; rapidly rotating neutron stars formed in core-collapse supernovae; and collapsing supermassive stars. Taken together, these objects are the focus of a large fraction of current astrophysical research. They are the likely source of detectable gravitational waves, powerful X-ray emission, and gamma-ray bursts. So far, however, they have resistedunderstanding because the underlying physics of the fluid, the electromagnetic field, and the gravitational field is complicated, nonlinear, and time dependent. Only numerical integrations can unlock the fundamental physics of black hole accretion, test scenarios for the generation of gamma-ray bursts, and generate more accurate predictions for gravitational waveforms from coalescing compact binaries. The required numerical methods do not yet exist; they will be developed under this award.

根据该奖项，将开发数值工具来研究涉及相对论引力、强电磁场和旋转的天体物理系统。 这些工具将包括用于在固定引力场中演化流体和电磁场的计算机代码、用于演化相对论引力场本身的代码，以及将利用材料和电磁源演化引力场的组合代码。 还将开发用于验证集成准确性的工具。 这些代码将针对最新一代超级计算机进行优化，并公开发布并在科学界提供。 在开发这些代码的过程中，计算科学家将接受本科生、研究生和博士后级别的培训。 这些代码还将被开发人员应用于天体物理学和引力物理学研究前沿的问题。这项工作是由许多天体物理系统推动的，包括：吸积黑洞和中子星；合并双中子星和黑洞；快速旋转的中子星在核心塌陷超新星中形成；和坍缩的超大质量恒星。 总的来说，这些物体是当前天体物理学研究的重点。 它们可能是可探测到的引力波、强大的 X 射线发射和伽马射线暴的来源。 然而，到目前为止，他们一直拒绝理解，因为流体、电磁场和引力场的基础物理是复杂的、非线性的和时间相关的。 只有数值积分才能解开黑洞吸积的基本物理原理，测试伽马射线暴生成的场景，并为聚结致密双星的引力波形生成更准确的预测。 所需的数值方法尚不存在；它们将根据该奖项进行开发。