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(Seminar) Solving the small-scale astrophysics anomalies with O(100) eV fermionic dark matter
2018-10-30     Text Size:  A

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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