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[colloquium] Donghai Zhao: A universal model for evolution of dark matter halos

發表日期:2021-06-09來源:放大 縮小
 
國臺學術報告2021 08 /NAOC Colloquium No.08 2021
暨國家天文臺組建20周年學術報告 Colloquium for the 20th anniversary of NAOC
   
報告題目/Title A universal model for evolution of dark matter halos
報告人/Speaker Dr. Donghai Zhao (SHAO)
報告時間/Time Wednesday 2:30 PM, June 09, 2021
報告地點/Location A601, NAOC & Live Streaming
主持人/Host Prof. Jie Wang
報告語言/Language: English (英文報告)
報告海報/Poster Click to download the poster
演示幻燈片/Slides Click to download the slides (later)
報告視頻/Video Click to watch the video (later)
直播鏈接/Live Webcast: 本期報告應報告人要求不安排直播,敬請諒解
   
報告摘要/Abstract  
Dark matter halos are the elementary units of the large-scale structure of the Universe and host galaxy formation. However, their formation and evolution are highly nonlinear gravitational processes, and the analytical theory of structure formation and evolution can only give an approximate image, while the numerical simulation studies have the defects of limited applicability, non-transferability and physical ambiguity, and suffer from numerical effects. By presenting the results of numerical simulations into the parameter space adopted by the analytical theory, a new approach was proposed by Donghai Zhao et al. in 2009, to obtain a universal model for halo mass growth and its internal structure evolution. I will show in this report this model applies precisely to any dark halo mass, to any period in the history of the Universe, to a wide variety of cosmological models and to not only cold but also warm and hot dark matter models, and thus are unquestionably applicable to our real universe. Following this approach, our research group has recently proposed a unified model of dark matter halo merger rate and a unified model of dark matter halo merger orbit, both of which are again accurate and universal, while physically clear. I’ll show also our new results on the anisotropy of velocity dispersion of smooth matter inside dark matter halos.
   
報告人介紹/Bio:  
Dr. Donghai Zhao is a researcher at the Shanghai Astronomical Observatory of the Chinese Academy of Sciences and got support from the National Science Fund for Excellent Young Scholars in 2012. He received his B.S. in Geology in 1996, joined the first Sino-German Max-Plank Partner Group in 1999 and received his Ph.D. in Astrophysics in 2002. He has been working at the Shanghai Astronomical Observatory since then. He has worked mainly on the formation and evolution of the large-scale structure of the Universe. His research results have been extensively included in two international textbooks Galactic Dynamics and Galaxy Formation and Evolution.
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