Collaborative Research: NSF-BSF: WoU-MMA: Crossing the Chasm: From Compact Object Mergers to Cosmic Fireworks

该项目将模拟中子星双星合并后物质流出的演变。该项目将把不同尺度上有效的模拟结果拼接在一起，使用小规模模拟的输出作为大规模模拟的输入。通过这种方式，该项目将能够跟踪最初合并事件的物质流出和喷射，一直到物质与星际介质相互作用的点。该项目将能够预测来自合并的电磁信号，并将它们与双星系统的初始属性联系起来。该项目还将开发用于公共宣传的材料，将天文学教育带给从幼儿园到高中的学生。这个奖项推进了“宇宙大创意之窗”的目标。该项目由美国国家科学基金会和美以两国国家科学基金会共同支持，旨在进一步促进两国天体物理界的合作。该项目将从合并事件的广义相对论模拟的最终快照开始，作为广义相对论磁流体动力学（GRMHD）模拟的初始条件。同样，GRMHD模拟的最终快照将被用作磁流体动力学（MHD）模拟的初始条件，该模拟将射流带到与星际介质相互作用的距离。然后，该项目将使用辐射传输代码从模拟结果中计算电磁信号。模拟将在gpu上运行，以提高计算效率。该项目还将为萨克拉门托图书馆开发适合K-5学生的“星星包”，可以在图书馆借阅。普渡大学的PI将为中学生和高中生开发关于引力和黑洞的教学材料。西北大学的PI将为高中阶段的电磁学课程开发教学材料。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。

The project will model the evolution of matter outflows following the merger of neutron star binaries. The project will stitch together the results from simulations that are valid at different scales, using the output of smaller scale simulations as the input for larger scale simulations. In this way, the project will be able to follow the matter outflows and jets from the initial merger event all the way out to the point where the material interacts with the interstellar medium. The project will be able to predict the electromagnetic signals from the merger and relate them to the initial properties of the binary system. The project will also develop materials for use in public outreach to bring astronomy education to students in kindergarten through high school. This award advances the goals of the Windows on the Universe Big Idea. This project is supported by both the National Science Foundation and the US-Israel Binational Science Foundation to further collaborations between the astrophysical communities in the two countries. The project will start with final snapshots from general relativity simulations of the merger event as initial conditions for general relativistic magnetohydrodynamic (GRMHD) simulations. Similarly, the final snapshots of the GRMHD simulations will be used as initial conditions for the magnetohydrodynamic (MHD) simulations that carry the jets out to distances where it interacts with the interstellar medium. The project will then calculate electromagnetic signals from the simulation results using a radiative transfer code. The simulations will be run on GPUs for increased computational efficiency. The project will also develop "Star Packs" for the Sacramento Library appropriate for K-5 students that can be checked out in libraries. The PI at Purdue will develop instructional materials on gravity and black holes for middle- and high-school students. The Northwestern PI will develop instructional materials for an electro-magnetism class at the high-school level.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.