Asymmetric Dark Matter
Jan, 2009
22 pages
Published in:
- Phys.Rev.D 79 (2009) 115016
e-Print:
- 0901.4117 [hep-ph]
Report number:
- FERMILAB-PUB-09-345-A-T
View in:
Citations per year
Abstract: (arXiv)
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 asymmetry generated at high temperatures is transfered to the dark matter, which is charged under . 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 dark matter mass in the range 5--15 GeV. The symmetric component of the dark matter can annihilate efficiently to light pseudoscalar Higgs particles , or via -channel exchange of new scalar doublets. The first possibility allows for decays, while the second predicts a light charged Higgs-like scalar decaying to . 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 LSP can decay into pairs of dark matter particles plus standard model particles, possibly with displaced vertices.- 95.35.+d
- dark matter: density
- dark matter: mass
- baryon: asymmetry
- Higgs particle: production
- dark matter: annihilation
- B-L number: asymmetry
- dark matter nucleon: elastic scattering
- Higgs particle: exchange
- cross section
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