【03.11】Seminar：Ab initio calculation of hyper-neutron matter
Seminar
報告題目：Ab initio calculation of hyper-neutron matter?
報告人：童輝，博士后，德國波恩大學(xué)和于利希研究中心
主持人：劉澤蘢，副研究員，中國科學(xué)院高能物理研究所
報告時間：2025年3月11日（周二），下午15:00
報告地點(diǎn)：高能所圖書館樓319
報告摘要：
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.
個人簡介：
童輝博士 2016 年本科畢業(yè)于蘭州大學(xué)，2020 年以聯(lián)合培養(yǎng)博士生身份赴日本理化學(xué)研究所交流，2021年博士畢業(yè)于北京大學(xué)，現(xiàn)為德國波恩大學(xué)和于利希研究中心聯(lián)合博士后。他的主要研究領(lǐng)域包括格點(diǎn) EFT（有效場論）和格點(diǎn)QCD（量子色動力學(xué)）的第一性原理計算，以及核物質(zhì)和中子星性質(zhì)的研究。童輝博士已在 Physical Review Letters、The?Astrophysical Journal、Physical Review C 等國際學(xué)術(shù)期刊發(fā)表論文 21 篇。
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