Sommerfeld enhancement of invisible dark matter annihilation in galaxies and galaxy clusters

被引:2
作者
Chan, Man Ho [1 ]
机构
[1] Hong Kong Inst Educ, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China
关键词
Dark matter; Sterile neutrino; SUPERMASSIVE BLACK-HOLE; DWARF GALAXIES; MASS; DENSITY; HALOS; CONSTRAINTS; PROFILE; CORES; MODEL; MILKY;
D O I
10.1016/j.astropartphys.2016.03.005
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent observations indicate that core-like dark matter structures exist in many galaxies, while numerical simulations reveal a singular dark matter density profile at the center. In this article, I show that if the annihilation of dark matter particles gives invisible sterile neutrinos, the Sommerfeld enhancement of the annihilation cross-section can give a sufficiently large annihilation rate to solve the core-cusp problem. The resultant core density, core radius, and their scaling relation generally agree with recent empirical fits from observations. Also, this model predicts that the resultant core-like structures in dwarf galaxies can be easily observed, but not for large normal galaxies and galaxy clusters. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:1 / 7
页数:7
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