arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2007.13029astro-ph.HE
收藏

事件视界望远镜时代活动星系核等离子体广义相对论磁流体力学方程

Generalized general-relativistic magnetohydrodynamic equations for plasmas of active galactic nuclei in the era of the Event Horizon Telescope

Shinji Koide

摘要:

广义相对论磁流体动力学(Generalized General-Relativistic Magnetohydrodynamic,简称GRMHD)方程已被用于研究特定的相对论等离子体现象,如相对论磁重联或非理想磁流体效应对波传播的影响。然而,广义欧姆定律中的“Theta”项,它表示组成等离子体的两种流体之间的能量交换,尚未在这些方程中确定。本文从广义相对论欧姆定律本身出发,确定了“Theta”项。这提供了广义GRMHD方程的封闭性,产生相对论等离子体方程的封闭系统。根据该方程组,我们揭示了非理想磁流体现象的特征尺度,阐明了理想GRMHD方程的适用条件。利用事件视界望远镜的观测数据,对M87 ~* 等离子体中非理想MHD现象的特征尺度进行了估算。

英文摘要:

The generalized general-relativisticmagnetohydrodynamic (generalized GRMHD) equations have been used to study specific relativistic-plasmas phenomena, such as relativistic magnetic reconnection or wave propagation modified by non-ideal MHD effects. However, the "Theta" term in the generalized Ohm law, which expresses the energy exchange between two fluids composing a plasma, has yet to be determined in these equations. In this paper, we determine the "Theta" term based on the generalized relativistic Ohm law itself. This provides closure of the generalized GRMHD equations, yielding a closed system of the equations of relativistic plasma. According to this system of equations, we reveal the characteristic scales of non-ideal MHD phenomena and clarify the applicable condition of the ideal GRMHD equations. We evaluate the characteristic scales of the non-ideal MHD phenomena in the M87* plasma using the Event Horizon Telescope observational data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑