Collaborative Research: WOU-MMA: Extreme Quantum-Electrodynamic and General-Relativistic Plasma Physics

合作研究：WOU-MMA：极端量子电动和广义相对论等离子体物理

• 批准号: 2010145
• 负责人: Alexander Philippov
• 金额: $ 36万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-15 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2010145&HistoricalAwards=false
• 关键词: Collaborative; Research; WOU; MMA; Extreme

This project will study the physics of atmospheres of neutron stars and black holes with very strong magnetic fields. Observational discovery of compact stars in our galaxy that are extraordinarily strong magnets, called magnetars, brings modern science into an uncharted territory of enormous magnetic fields. This is where quantum mechanics, rather than everyday physics, describes objects as massive as our Sun. At the same time, detection of gravitational wave signals from merging black holes and neutron stars opened a new observational domain for studies of objects governed by extremely strong gravity. Magnetars, neutron stars and black holes are astrophysical multi-messenger laboratories for studies of the interplay of electromagnetic, quantum, and gravitational effects. The primary goal of this project is to better understand such systems by developing a comprehensive description of collective non-linear behavior of matter in super-strong magnetic and gravitational fields; by doing so, it will also directly contribute to the goals of NSF's "Windows on the Universe: The Era of Multi-Messenger Astrophysics" Big Idea. This collaborative project will serve to train graduate students and to promote diversity by recruiting students from underrepresented minority groups. Magnetars -- neutron stars with magnetic fields exceeding the critical Schwinger field, merging neutron star and black hole binaries, and collapsing neutron stars are the primary astronomical sources where quantum electrodynamic (QED) and general relativistic (GR) effects strongly affect the properties and behavior of plasma. This project aims to understand the dynamics of collisionless pair plasmas in such environments. Moreover, recent advances in laser technology allow state-of-the-art high-intensity laser systems to approach regimes relevant for studies of plasma under such extreme, super-critical field conditions. Upcoming laser-plasma experiments and multi-messenger astronomy observations will allow one to probe into extreme plasma and astrophysical phenomena that were previously inaccessible; and this project will create theoretical and numerical modeling foundations for interpreting results of such laboratory experiments and astronomical observations. The specific questions to be addressed are: (i) What are the plasma properties, collective plasma modes and instabilities in a supercritical magnetic field? (ii) How do GR and QED effects change the dynamics of magnetic reconnection? (iii) How does a black hole formed in the collapse of a magnetized neutron star dissipate its magnetic field? (iv) How do rotating black holes produce electron-positron plasmas? These questions will be answered using a combination of analytical and numerical approaches.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.

该项目将研究具有非常强磁场的中子星和黑洞大气的物理学。 在我们的银河系中发现的致密恒星是非常强的磁铁，称为磁星，将现代科学带入了一个未知的巨大磁场领域。 这就是量子力学，而不是日常物理学，描述像我们的太阳这样大的物体的地方。 与此同时，对黑洞和中子星合并产生的引力波信号的探测为研究受极强引力支配的物体开辟了一个新的观测领域。 磁星、中子星和黑洞是研究电磁、量子和引力效应相互作用的天体物理多信使实验室。 该项目的主要目标是通过对超强磁场和引力场中物质的集体非线性行为进行全面描述来更好地理解此类系统;通过这样做，它也将直接有助于实现NSF的“宇宙之窗：多信使天体物理学时代”的目标。 这一合作项目将有助于培训研究生，并通过从代表性不足的少数群体中招收学生来促进多样性。磁星--磁场超过临界Schwinger场的中子星，合并中子星星和黑洞双星，以及坍缩中子星是主要的天文源，量子电动力学（QED）和广义相对论（GR）效应强烈影响等离子体的性质和行为。 这个项目的目的是了解在这种环境中的无碰撞对等离子体的动力学。 此外，激光技术的最新进展允许最先进的高强度激光系统接近与在这种极端、超临界场条件下研究等离子体相关的制度。 即将进行的激光等离子体实验和多信使天文观测将使人们能够探索以前无法进入的极端等离子体和天体物理现象;该项目将为解释这种实验室实验和天文观测的结果奠定理论和数值建模基础。 要解决的具体问题是：（一）什么是等离子体的属性，集体等离子体模式和超临界磁场中的不稳定性？(ii)GR和QED效应如何改变磁场重联的动力学？(iii)在磁化中子星星坍缩过程中形成的黑洞是如何耗散其磁场的？(iv)旋转黑洞如何产生正负电子等离子体？ 这个奖项反映了NSF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。

项目成果

Synthetic gamma-ray light curves of Kerr black hole magnetospheric activity from particle-in-cell simulations

• DOI: 10.1051/0004-6361/202040158
• 发表时间: 2020-12
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: B. Crinquand;B. Cerutti;G. Dubus;K. Parfrey;A. Philippov

Electric Field Screening in Pair Discharges and Generation of Pulsar Radio Emission

• DOI: 10.3847/2041-8213/ac7c71
• 发表时间: 2022-02
• 期刊: The Astrophysical Journal Letters
• 作者: E. Tolman;A. Philippov;A. Timokhin

Black Hole Flares: Ejection of Accreted Magnetic Flux through 3D Plasmoid-mediated Reconnection

• DOI: 10.3847/2041-8213/ac46a1
• 发表时间: 2021-09
• 期刊: The Astrophysical Journal Letters
• 作者: B. Ripperda;M. Liska;K. Chatterjee;G. Musoke;A. Philippov;S. Markoff;A. Tchekhovskoy;Z. Younsi