物理学院 School of Physics, Nanjing University

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Ultra-Light Axion Dark Matter and its impacts on dark halo structure in N-body simulation

2016年11月10日

报告题目:Ultra-Light Axion Dark Matter and its impacts on dark halo structure in N-body simulation 
报告人:蔡岳霖 博士 

                台湾清华大学理论中心
    间:11月15日(周二)下午 14:00
    点:物理楼233

报告摘要: The Ultra-Light Axion (ULA) is a dark matter candidate with mass O(1e-22) eV and its de Broglie wavelength is of order kpc. Such an axion, also called the Fuzzy Dark Matter (FDM), thermalizes via the gravitational force and forms a Bose-Einstein condensate. Recent studies suggested that the quantum pressure from the FDM can significantly affect the structure formation in the small scale, thus alleviating the so-called "small-scale crisis". In this paper, we develop a new technique to discretize the quantum pressure and illustrate the interactions among the FDM particles in the NN-body simulation, which accurately simulates the formation of the dark-matter halo and its inner structure. In a self-gravitationally-bound virialized halo, we find a constant density core, called solitonic core, with size of around 1 kpc, which is consistent with the theoretical prediction. The density distribution outside the core follows a normal CDM prediction described by the Einasto profile. However, the core density is higher than the normal CDM density, which reveals the non-linear effect of quantum pressure and impacts the structure formation in the FDM model. 

This work (1611.00892 ) is in collaboration with Jiajun Zhang, Kingman Cheung, and Ming-Chung Chu. 

报告人简介:蔡岳霖博士于新竹国立交通大学物理所硕士期间(2002-2004)钻研“太阳中微子振荡”, 之后于英国谢菲尔德 (天文与物理系)博士毕业(2006-2011),论文题目为“超对称暗物质搜寻”,并且2006-2007于意大利SISSA进修。毕业后在波兰国家核子研究中心担任青年科学家(2011-2013),以及东京大学-卡弗里-数物连携宇宙研究机构担任博士后研究员 (2013-2016)。
从2016年起在台湾清华大学理论中心担任助理研究学者。主要研究暗物质观测现象学,对于1) 直接观测 2) 间接观测 3) 对撞机中暗物质潜在信号 4)暗物质宇宙结构等议题有长时间的钻研与心得。目前关心的方向主要为为GeV以下的轻Dark Matter。

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