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

我们已经进入了高能天体物理学的一个非常激动人心的时代，一系列天文台的观测数据很快积累起来，包括LIGO-Virgo-KAGRA合作的引力波(GW)、来自NETER的脉冲星X射线、来自Event Horizon望远镜的超大质量黑洞图像、以及CHINE的快速射电爆发观测等等。这一巨大的成功正在刺激未来GW天文台的发展，除了新的电磁望远镜外，还包括LISA、爱因斯坦望远镜和宇宙探索者。正是在这种背景下，数值工作帮助指导和提炼科学。这些努力可能有助于阐明r-Process元素的来源和千枚卵子所需条件的细节。这些利用先进的大涡模拟(LES)和中微子在双星合并中加热和冷却的磁结构研究将有助于更好地理解短伽马射线暴(SGRB)背后的引擎。通过该奖项提供的这类数值方法的培训和开发在越来越多的领域中变得越来越重要。该项目旨在推动通过研究双中子星和黑洞-中子星合并而实现的多信使科学：(I)继续开发开放源码的MHDUET程序，一个广义相对论，磁流体(GRMHD)程序，(Ii)测试小组实施的M1中微子传输计划与热中子星和双中子星合并，然后进展到一个混合计划，以及(Iii)用大涡模拟技术、真实状态方程、中微子加热和冷却研究合并和合并后中子星合并的信号和外流。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势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.