Asymmetric dark matter

被引:519
|
作者
Kaplan, David E. [1 ]
Luty, Markus A. [2 ]
Zurek, Kathryn M. [3 ,4 ]
机构
[1] Johns Hopkins Univ, Dept Phys, Baltimore, MD 21218 USA
[2] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
[3] Ctr Particle Astrophys, Fermi Natl Accelerator Lab, Batavia, IL 60510 USA
[4] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
来源
PHYSICAL REVIEW D | 2009年 / 79卷 / 11期
基金
美国国家科学基金会;
关键词
BARYON ASYMMETRY; NUMBER VIOLATION; CP-INVARIANCE; BARYOGENESIS; SPHALERONS; HIGGS;
D O I
10.1103/PhysRevD.79.115016
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider a simple class of models in which the relic density of dark matter is determined by the baryon asymmetry of the Universe. In these models a B-L asymmetry generated at high temperatures is transferred to the dark matter, which is charged under B-L. The interactions that transfer the asymmetry decouple at temperatures above the dark matter mass, freezing in a dark matter asymmetry of order the baryon asymmetry. This explains the observed relation between the baryon and dark matter densities for the dark matter mass in the range 5-15 GeV. The symmetric component of the dark matter can annihilate efficiently to light pseudoscalar Higgs particles a or via t-channel exchange of new scalar doublets. The first possibility allows for h(0)-> aa decays, while the second predicts a light charged Higgs-like scalar decaying to tau nu. Direct detection can arise from Higgs exchange in the first model or a nonzero magnetic moment in the second. In supersymmetric models, the would-be lightest supersymmetric partner can decay into pairs of dark matter particles plus standard model particles, possibly with displaced vertices.
引用
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页数:11
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