Magnetized Mergers of Black Holes and Neutron Stars with LES and Neutrino Transport

在高能天体物理学领域，我们已经进入了一个非常激动人心的时期，一系列天文台的观测结果积累得非常快，包括LIGO-Virgo-KAGRA合作项目的引力波（GW）、NICER的脉冲星x射线、事件视界望远镜（Event Horizon Telescope）的超大质量黑洞图像、CHIME的快速射电暴观测，以及许多其他天文台。这一巨大的成功刺激了未来GW天文台的发展，如LISA、爱因斯坦望远镜和宇宙探索者，以及新的电磁望远镜。正是在这种背景下，数值工作有助于指导和提取科学。这些努力可能有助于阐明r-过程元素来源的细节和千元所需的条件。这些利用先进的大涡模拟（LES）和双星合并中的中微子加热和冷却对磁结构的研究将有助于更好地理解短伽马射线暴（sGRB）背后的引擎。通过该奖项提供的数值方法的培训和发展在越来越多的领域中变得越来越重要。该项目旨在推进通过研究双中子星和黑洞-中子星合并而获得的多信使科学：(i)继续开发开源的MHDUET代码，一个广义相对论的磁流体动力学（GRMHD）代码，（ii）测试小组对热中子星和双中子星合并的M1中微子输运方案的实现，然后进展到混合方案，（iii）研究合并和合并后的信号和双中子星合并的流出与磁场大涡模拟技术，现实的状态方程，中微子加热和冷却。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。

We have entered a very exciting time in high energy astrophysics with observations accumulating very quickly from a range of observatories including gravitational waves (GW) from the LIGO-Virgo-KAGRA collaboration, pulsar X-rays from NICER, supermassive black hole images from the Event Horizon Telescope, and fast radio burst observations from CHIME, and many others. This tremendous success is spurring the development of future GW observatories, such as LISA, the Einstein Telescope, and the Cosmic Explorer, in addition to new electromagnetic telescopes. And it is in this context that numerical work helps guide and extract the science. These efforts may help elucidate details about the source of r-process elements and the conditions needed for a kilonova. These studies of the magnetic structure with advanced Large Eddy Simulation (LES) and with neutrino heating and cooling in binary mergers will help develop a better understanding of the engine behind short gamma-ray bursts (sGRB). Training in and development of numerical methods of the type provided through this award is becoming more and more important in an increasing variety of fields.This project seeks to push forward the multi-messenger science achieved by studying binary neutron star and black hole--neutron star mergers: (i) continued development of the open-source MHDUET code, a general relativistic, magnetohydrodynamics(GRMHD) code, (ii) test the group's implementation of an M1 neutrino transport scheme with hot neutron stars and binary neutron star mergers, and then progress to a hybrid scheme, and (iii) study the merger and post-merger signals and outflows from binary neutron star mergers with magnetic field with large eddy simulation techniques, realistic equations of state, neutrino heating and cooling.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.