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| (Seminar) Solving the small-scale astrophysics anomalies with O(100) eV fermionic dark matter |
| 2018-10-30
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| CAS Key Laboratory of Theoretical Physics | | Institute of Theoretical Physics | | Chinese Academy of Sciences | | Seminar | | Title 题目 | Solving the small-scale astrophysics anomalies with O(100) eV fermionic dark matter | | Speaker 报告人 | Haipeng An | | Affiliation 所在单位 | Tsinghua University | | Date 日期 | 2:30pm, Oct.30, 2018, Tuesday | | Venue 地点 | Conference Room 6420, ITP new building | | Abstract 摘要 | Cold dark matter model (CDM) is an extremely successful model to explain the large scale structure of the Universe, corresponding to distances greater than O(Mpc) today. However, some numerical simulations indicate that observations connected with small scales might be in tension with this framework. In particular, simulations based on CDM show that the mass density profile of CDM halo increases as 1/r toward the center, whereas many observed rotation curves of disk galaxies prefer a constant cored density profile. CDM also predicts a greater number of galactic satellites than observed. Observations also show that galactic clusters have mass deficit in the inner O(10) kpc region. In this talk I will present a model in which the dark matter particle is a fermion with a mass around 100 eV, the relic density is generated from the freeze-in mechanism. I will show that in this model the above small scale anomalies can be automatically solved. | | Contact person 所内联系人 | Song He |
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