报告题目：Accretion Disk Outbursts: MHD Simulations (Finally) Confront Reality
报告人：Prof. Omer Blaes (UC Santa Barbara)
地点：本部学院旧楼（南光三）113教室（学院后门铁门旁的小教室）
时间：2014年9月1日下午3：00
摘要：
Accretion disks around compact objects are responsible for some of the most
powerful phenomena that we observe in the universe, from gamma-ray bursts
to quasars. Stresses in the flow that transport angular momentum outward
and allow gravitational binding energy to be released are central to the
physics of these flows. For over twenty years, the dominant theoretical
paradigm for these stresses is turbulence driven by an instability of weak
magnetic fields embedded in the flow. Numerical simulations of this turbulence
have revealed much about how these stresses might work, but until recently,
they have not successfully explained (never mind predicted) the most
significant quantitative observational constraints: the outburst time scales
of dwarf novae and low mass X-ray binaries. I will describe recent progress
on understanding the behavior of these systems through simulations that
incorporate the physics that is essential for exploring the physics of these
phenomena.
