Stars, Dust, Cosmic Rays, and how they Change the Universe
报告人（单位）
Prof. Philip Hopkins（加州理工学院）
报告时间
2022年4月21日（周四）14:00
主办方
中科院上海天文台
直播二维码
报告人介绍
Philip Hopkins教授是加州理工学院教授，研究领域包括星系形成、恒星形成、行星形成、黑洞、天体物理流体力学、等离子体物理、宇宙学和暗物质。Hopkins教授于2008年从哈佛大学获得博士学位，2008年到2013年于加州大学伯克利分校任Miller和Einstein Fellow。2013年起于加州理工学院任助理教授，并于2017年成为正教授。Hopkins教授获得了诸多奖项，包括享有盛誉的美国天文联合会Helen B. Warner奖。迄今为止，共发表论文380余篇（其中第一作者论文约120篇），引用数逾33,700次（其中第一作者论文引用数逾16,000次），h指数96（第一作者h指数62）。
报告摘要
The fundamental challenge in understanding galaxy and star formation, and the physics of the interstellar, circum and inter-galactic medium (ISM/CGM/IGM) lies in the fact that while gravity acts in a “top-down" fashion, other “micro-physics" on scales as small as stellar interiors and below has effects which propagate “back up" to alter the Universe on cosmological scales. I'll give a brief review of some of the work our group has been doing in the last few years to bridge this tremendous range of scales in the context of star and galaxy formation, particularly with respect to the effects of “feedback" (jets, outflows, supernovae) from stars. I'll then discuss two specific examples -- interstellar cosmic rays and dust -- where fundamental uncertainties in “micro-physics" on sub-AU scales produce qualitatively different macroscopic behaviors of gas accretion, star formation, and outflows in star forming regions and galaxies. I'll review how new micro-physical instabilities and processes may change the “textbook" stories of these constituents of the ISM and resolve some long-standing puzzles, and how we might hope to make progress given the enormously disparate range of scales involved.