【03.11】Seminar：Ab initio calculation of hyper-neutron matter
Seminar
报告题目：Ab initio calculation of hyper-neutron matter
报告人：童辉，博士后，德国波恩大学和于利希研究中心
主持人：刘泽茏，副研究员，
报告时间：2025年3月11日（周二），下午15:00
报告地点：高能所图书馆楼319
报告摘要：
The equation of state (EoS) of neutron matter plays a decisive role to understand the neutron star properties and the gravitational waves from neutron star mergers. At sufficient densities, the appearance of hyperons generally softens the EoS, leading to a reduction in the maximum mass of neutron stars well below the observed values of about 2 solar masses. Even though repulsive three-body forces are known to solve this so-called ``hyperon puzzle'', so far performing \textit{ab initio} Monte Carlo calculations with a substantial number of hyperons has remained elusive. We address this challenge by employing Nuclear Lattice Effective Field Theory with up to 232 neutrons and 116 $\Lambda$ hyperons in a finite volume. We introduce a novel auxiliary field quantum Monte Carlo algorithm, allowing us to simulate both pure neutron matter and hyper-neutron matter up to 5 times the density of nuclear matter using a single auxiliary field without any sign oscillations. Also, for the first time in {\em ab initio} Monte Carlo calculations, we not only include $N\Lambda$ two-body and $NN\Lambda$ three-body forces, but also $\Lambda\Lambda$ and $N\Lambda\Lambda$ interactions. Consequently, we determine essential astrophysical quantities such as the neutron star mass-radius relation and confirm the existence of the universal $I$-Love-$Q$ relation.
个人简介：
童辉博士 2016 年本科毕业于兰州大学，2020 年以联合培养博士生身份赴日本理化学研究所交流，2021年博士毕业于北京大学，现为德国波恩大学和于利希研究中心联合博士后。他的主要研究领域包括格点 EFT（有效场论）和格点QCD（量子色动力学）的第一性原理计算，以及核物质和中子星性质的研究。童辉博士已在 Physical Review Letters、The Astrophysical Journal、Physical Review C 等国际学术期刊发表论文 21 篇。
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