报告题目：Relativistic Magnetohydrodynamics and Partice-in-Cell Studies of Magnetically Dominated Outflows

　　报 告 人：Hui Li (Los Alamos National Laboratory)

　　报告摘要：Observations of several high-energy astrophysical systems have emphasized the important role of magnetic fields in the magnetically dominated outflows, including powerful jets from Active Galactic Nuclei (AGNs), pulsar winds and possibly gamma-ray bursts. We present three-dimensional relativistic MHD simulations of magnetic tower configuration as a model for magnetically dominated outflows driven by accreting black holes. We will discuss their stability and energy conversion processes (from magnetically dominated regime to kinetic energy). The role of current driven instabilities will be discussed in detail. Furthermore, we will present large-scale particle-in-cell simulations of relativistic reconnection to examine the magnetic energy dissipation processes and the associated particle acceleration processes. We show that the relativistic flows generated by reconnection can give rise to a first-order Fermi-like acceleration that operates very efficiently in highly magnetically dominated limit.

　　时    间：7月22日星期二上午10：00

　　地    点：紫金山天文台517会议室

　　联 系 人：朱林林（83332173）

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　　                                          紫金山天文台学术委员会