报告详情
Simulations of pulsar magnetospheres with surface pair injection using VSHPIC
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更新：2026-04-23 16:31:10 浏览：4次
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摘要
Pulsars are rotating neutron stars with extreme magnetic fields. The particle acceleration in pulsar’s magnetospheric is a key topic in high energy astrophysics. The Goldreich-Julian model describes how the induced electric field of a rotating neutron star extracts charge from its surface to fill the magnetosphere. In this theory, the magnetosphere should enter a force-free state when the plasma density reaches the Goldreich-Julian density, which can completely screen the parallel electric field. However, the actual steady-state configuration of the magnetosphere depends strongly on particle injection mechanisms.
We employ VSHPIC [1], a particle-in-cell algorithm based on vector spherical harmonic expansion, to study magnetospheric evolution in the aligned rotators. VSHPIC uses vector spherical harmonics to expand electromagnetic fields and charge and current densities. It allows for a flexible truncation of expansion orders based on accuracy requirements. This approach maintains physical fidelity while significantly reducing computational costs. We initialize the simulation with a dipole magnetic field and the Deutsch vacuum solution, and implement a surface particle emission model following Michel & Li [2]. This allows us to simulate the evolution of the magnetosphere around a rotating magnetized neutron star. Simulation results show that under conditions with only surface particle injection and no pair production, the magnetosphere fails to form closed current circuits. It rapidly evolves into a steady-state structure of a “dead pulsar” with charge-separated domes and an equatorial torus. This work establishes a foundation for future studies incorporating pair production models and the physics of oblique rotators in VSHPIC.
We employ VSHPIC [1], a particle-in-cell algorithm based on vector spherical harmonic expansion, to study magnetospheric evolution in the aligned rotators. VSHPIC uses vector spherical harmonics to expand electromagnetic fields and charge and current densities. It allows for a flexible truncation of expansion orders based on accuracy requirements. This approach maintains physical fidelity while significantly reducing computational costs. We initialize the simulation with a dipole magnetic field and the Deutsch vacuum solution, and implement a surface particle emission model following Michel & Li [2]. This allows us to simulate the evolution of the magnetosphere around a rotating magnetized neutron star. Simulation results show that under conditions with only surface particle injection and no pair production, the magnetosphere fails to form closed current circuits. It rapidly evolves into a steady-state structure of a “dead pulsar” with charge-separated domes and an equatorial torus. This work establishes a foundation for future studies incorporating pair production models and the physics of oblique rotators in VSHPIC.
关键词
Particle-in-Cell; Vector spherical harmonics; pair injection
报告人
志豪 徐
Graduate Student 北京师范大学稿件作者
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重要日期
-
05月12日
2026
会议日期
-
04月15日 2026
初稿截稿日期
主办单位
等离子体物理全国重点实验室
厦门大学
厦门大学
联系方式
历届会议
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2025年05月12日 中国 西安市
第八届极端条件下的物质与辐射国际会议 -
2024年05月13日 中国 Hangzhou
第七届极端条件下的物质与辐射国际会议 -
2023年06月05日 中国 Zhuhai
第六届极端条件下的物质与辐射国际会议 -
2020年05月25日 中国 Xi'an
第五届极端条件下的物质与辐射国际会议 -
2019年05月29日 中国 Hefei
第四届极端物质与辐射国际会议 -
2017年06月01日 中国 Beijing,China
第二届极端物质与辐射国际会议
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